The Maxwell–Stefan description of mixture diffusion in nanoporous crystalline materials

[1]  Xiaoli Ma,et al.  Gas transport properties and propylene/propane separation characteristics of ZIF-8 membranes , 2014 .

[2]  R. Krishna,et al.  Experiments and simulations on separating a CO2/CH4 mixture using K-KFI at low and high pressures , 2014 .

[3]  G. Pirngruber,et al.  Post-Combustion CO2 Capture by Vacuum Swing Adsorption Using Zeolites – a Feasibility Study , 2014 .

[4]  Alírio E. Rodrigues,et al.  H2 purification by pressure swing adsorption using CuBTC , 2013 .

[5]  Chao Zou,et al.  Expanded organic building units for the construction of highly porous metal-organic frameworks. , 2013, Chemistry.

[6]  C. Serre,et al.  A robust amino-functionalized titanium(iv) based MOF for improved separation of acid gases. , 2013, Chemical communications.

[7]  Stefano Brandani,et al.  A Multiscale Study of MOFs as Adsorbents in H2 PSA Purification , 2013 .

[8]  M. O'keeffe,et al.  Low-energy regeneration and high productivity in a lanthanide-hexacarboxylate framework for high-pressure CO2-CH4-H2 separation. , 2013, Chemical communications.

[9]  J. Caro,et al.  Ethene/ethane and propene/propane separation via the olefin and paraffin selective metal-organic framework adsorbents CPO-27 and ZIF-8. , 2013, Langmuir : the ACS journal of surfaces and colloids.

[10]  Rajamani Krishna,et al.  Separation of Hexane Isomers in a Metal-Organic Framework with Triangular Channels , 2013, Science.

[11]  R. Krishna,et al.  Influence of adsorption thermodynamics on guest diffusivities in nanoporous crystalline materials. , 2013, Physical chemistry chemical physics : PCCP.

[12]  G. Baron,et al.  Nonuniform Chain-Length-Dependent Diffusion of Short 1-Alcohols in SAPO-34 in Liquid Phase , 2013 .

[13]  D. Vos,et al.  Selective Dynamic CO2 Separations on Mg-MOF-74 at Low Pressures: A Detailed Comparison with 13X , 2013 .

[14]  C. Kirschhock,et al.  Adsorption and separation of CO2 on KFI zeolites: effect of cation type and Si/Al ratio on equilibrium and kinetic properties. , 2013, Langmuir : the ACS journal of surfaces and colloids.

[15]  J. Long,et al.  Selective adsorption of ethylene over ethane and propylene over propane in the metal–organic frameworks M2(dobdc) (M = Mg, Mn, Fe, Co, Ni, Zn) , 2013 .

[16]  Stephen D. Burd,et al.  Porous materials with optimal adsorption thermodynamics and kinetics for CO2 separation , 2013, Nature.

[17]  C. Jallut,et al.  A transient method for mass‐transfer characterization through supported zeolite membranes: Extension to two components , 2013 .

[18]  R. Krishna,et al.  Investigating the influence of diffusional coupling on mixture permeation across porous membranes , 2013 .

[19]  Rajamani Krishna,et al.  Carbon Dioxide Capture from Air Using Amine-Grafted Porous Polymer Networks , 2013 .

[20]  W. Zhou,et al.  A microporous metal–organic framework assembled from an aromatic tetracarboxylate for H2 purification , 2013 .

[21]  Yuanjing Cui,et al.  A microporous metal–organic framework with both open metal and Lewis basic pyridyl sites for highly selective C2H2/CH4 and C2H2/CO2 gas separation at room temperature , 2013 .

[22]  Rajamani Krishna,et al.  Computer-assisted screening of ordered crystalline nanoporous adsorbents for separation of alkane isomers. , 2012, Angewandte Chemie.

[23]  D. Vos,et al.  Vapor-Phase Adsorption and Separation of Ethylbenzene and Styrene on the Metal–Organic Frameworks MIL-47 and MIL-53(Al) , 2012 .

[24]  A. J. Blake,et al.  Selectivity and direct visualization of carbon dioxide and sulfur dioxide in a decorated porous host. , 2012, Nature chemistry.

[25]  R. Krishna,et al.  Investigating the relative influences of molecular dimensions and binding energies on diffusivities of guest species inside nanoporous crystalline materials , 2012 .

[26]  M. O'keeffe,et al.  A microporous lanthanide-tricarboxylate framework with the potential for purification of natural gas. , 2012, Chemical communications.

[27]  A. Simon‐Masseron,et al.  Adsorption and Separation of Xylene Isomers: CPO-27-Ni vs HKUST-1 vs NaY , 2012 .

[28]  Rajamani Krishna,et al.  Metal–organic frameworks with potential for energy-efficient adsorptive separation of light hydrocarbons , 2012 .

[29]  G. Zhu,et al.  Hydrogen Selective NH2‐MIL‐53(Al) MOF Membranes with High Permeability , 2012 .

[30]  M. A. Moreira,et al.  Effect of ethylbenzene in p-xylene selectivity of the porous titanium amino terephthalate MIL-125(Ti)_NH2 , 2012 .

[31]  R. Krishna,et al.  Cu-TDPAT, an rht-type dual-functional metal-organic framework offering significant potential for use in H2 and natural gas purification processes operating at high pressures , 2012 .

[32]  P. Thallapally,et al.  Metal-organic frameworks for removal of Xe and Kr from nuclear fuel reprocessing plants. , 2012, Langmuir : the ACS journal of surfaces and colloids.

[33]  D. Vos,et al.  Liquid-Phase Adsorption and Separation of Xylene Isomers by the Flexible Porous Metal–Organic Framework MIL-53(Fe) , 2012 .

[34]  Rajamani Krishna,et al.  Adsorptive separation of CO2/CH4/CO gas mixtures at high pressures , 2012 .

[35]  Rajamani Krishna,et al.  A robust doubly interpenetrated metal-organic framework constructed from a novel aromatic tricarboxylate for highly selective separation of small hydrocarbons. , 2012, Chemical communications.

[36]  R. Krishna,et al.  Interplay of metalloligand and organic ligand to tune micropores within isostructural mixed-metal organic frameworks (M'MOFs) for their highly selective separation of chiral and achiral small molecules. , 2012, Journal of the American Chemical Society.

[37]  Jian Tian,et al.  Selective CO2 Capture from Flue Gas Using Metal–Organic Frameworks―A Fixed Bed Study , 2012 .

[38]  Jeffrey R. Long,et al.  Capture of carbon dioxide from air and flue gas in the alkylamine-appended metal-organic framework mmen-Mg2(dobpdc). , 2012, Journal of the American Chemical Society.

[39]  Vincent Guillerm,et al.  A method for screening the potential of MOFs as CO2 adsorbents in pressure swing adsorption processes. , 2012, ChemSusChem.

[40]  Rajamani Krishna,et al.  Hydrocarbon Separations in a Metal-Organic Framework with Open Iron(II) Coordination Sites , 2012, Science.

[41]  Rajamani Krishna,et al.  Diffusion in porous crystalline materials. , 2012, Chemical Society reviews.

[42]  M. A. Moreira,et al.  Reverse shape selectivity in the liquid-phase adsorption of xylene isomers in zirconium terephthalate MOF UiO-66. , 2012, Langmuir : the ACS journal of surfaces and colloids.

[43]  Céline Chizallet,et al.  Comparison of the behavior of metal-organic frameworks and zeolites for hydrocarbon separations. , 2012, Journal of the American Chemical Society.

[44]  A. Simon‐Masseron,et al.  Separation of C6 Paraffins Using Zeolitic Imidazolate Frameworks: Comparison with Zeolite 5A , 2012 .

[45]  J. Long,et al.  CO2/CH4, CH4/H2 and CO2/CH4/H2 separations at high pressures using Mg2(dobdc) , 2012 .

[46]  Rajamani Krishna,et al.  A comparison of the CO2 capture characteristics of zeolites and metal-organic frameworks , 2012 .

[47]  Z. Lai,et al.  Effective separation of propylene/propane binary mixtures by ZIF-8 membranes , 2012 .

[48]  M. A. Moreira,et al.  Toward understanding the influence of ethylbenzene in p-xylene selectivity of the porous titanium amino terephthalate MIL-125(Ti): adsorption equilibrium and separation of xylene isomers. , 2012, Langmuir : the ACS journal of surfaces and colloids.

[49]  Y. H. Kim,et al.  Adsorption characteristics of zeolites for dehydration of ethanol: Evaluation of diffusivity of water in porous structure , 2012 .

[50]  Shamsuzzaman Farooq,et al.  Separation of Methane–Nitrogen Mixture by Pressure Swing Adsorption for Natural Gas Upgrading , 2011 .

[51]  R. Krishna,et al.  MaxwellStefan modeling of slowing-down effects in mixed gas permeation across porous membranes , 2011 .

[52]  Peyman Z. Moghadam,et al.  p-Xylene-selective metal-organic frameworks: a case of topology-directed selectivity. , 2011, Journal of the American Chemical Society.

[53]  Tom Rémy,et al.  Modeling the effect of structural changes during dynamic separation processes on MOFs. , 2011, Langmuir : the ACS journal of surfaces and colloids.

[54]  E. Sjöberg,et al.  Very high flux MFI membrane for CO 2 separation , 2011 .

[55]  D. D’Alessandro,et al.  Enhanced carbon dioxide capture upon incorporation of N,N′-dimethylethylenediamine in the metal–organic framework CuBTTri , 2011 .

[56]  Craig M. Brown,et al.  Selective binding of O2 over N2 in a redox-active metal-organic framework with open iron(II) coordination sites. , 2011, Journal of the American Chemical Society.

[57]  Kenji Sumida,et al.  Evaluating metal–organic frameworks for post-combustion carbon dioxide capture via temperature swing adsorption , 2011 .

[58]  F. Kapteijn,et al.  Understanding the anomalous alkane selectivity of ZIF-7 in the separation of light alkane/alkene mixtures. , 2011, Chemistry.

[59]  R. Krishna,et al.  Investigating the potential of MgMOF-74 membranes for CO2 capture , 2011 .

[60]  J. Lercher,et al.  A comparative study of diffusion of benzene/p-xylene mixtures in MFI particles, pellets and grown membranes , 2011 .

[61]  Rajamani Krishna,et al.  Screening metal–organic frameworks by analysis of transient breakthrough of gas mixtures in a fixed bed adsorber , 2011 .

[62]  D. Zhao,et al.  A zinc(II) metal-organic framework based on triazole and dicarboxylate ligands for selective adsorption of hexane isomers. , 2011, Chemical communications.

[63]  R. Krishna,et al.  In silico screening of metal-organic frameworks in separation applications. , 2011, Physical chemistry chemical physics : PCCP.

[64]  P. Webley,et al.  Adsorption and Separation of C1−C8 Alcohols on SAPO-34 , 2011 .

[65]  Rajamani Krishna,et al.  Metal-organic frameworks as adsorbents for hydrogen purification and precombustion carbon dioxide capture. , 2011, Journal of the American Chemical Society.

[66]  A. Feldhoff,et al.  Oriented Zeolitic Imidazolate Framework-8 Membrane with Sharp H2/C3H8 Molecular Sieve Separation , 2011 .

[67]  R. Krishna,et al.  Ethene/ethane separation by the MOF membrane ZIF-8: Molecular correlation of permeation, adsorption, diffusion , 2011 .

[68]  C. Serre,et al.  Reverse shape selectivity in the adsorption of hexane and xylene isomers in MOF UiO-66 , 2011 .

[69]  B. Majumdar,et al.  Adsorption and Diffusion of Methane and Nitrogen in Barium Exchanged ETS-4 , 2011 .

[70]  R. Krishna,et al.  Entropy-based separation of linear chain molecules by exploiting differences in the saturation capacities in cage-type zeolites , 2011 .

[71]  R. Krishna,et al.  A molecular dynamics investigation of the diffusion characteristics of cavity-type zeolites with 8-ring windows , 2011 .

[72]  F. Kapteijn,et al.  Ethane/ethene separation turned on its head: selective ethane adsorption on the metal-organic framework ZIF-7 through a gate-opening mechanism. , 2010, Journal of the American Chemical Society.

[73]  M. Nishioka,et al.  Formation of high flux CHA-type zeolite membranes and their application to the dehydration of alcohol solutions , 2010 .

[74]  J. Caro,et al.  Novel MOF‐Membrane for Molecular Sieving Predicted by IR‐Diffusion Studies and Molecular Modeling , 2010, Advanced materials.

[75]  D. D. De Vos,et al.  Separation of styrene and ethylbenzene on metal-organic frameworks: analogous structures with different adsorption mechanisms. , 2010, Journal of the American Chemical Society.

[76]  Fumin Zhang,et al.  Comparison Study on the Adsorption of CFC-115 and HFC-125 on Activated Carbon and Silicalite-1 , 2010 .

[77]  G. Pirngruber,et al.  CO2 and CH4 Separation by Adsorption Using Cu-BTC Metal−Organic Framework , 2010 .

[78]  M. Fröba,et al.  New microporous materials for acetylene storage and C(2)H(2)/CO(2) separation: insights from molecular simulations. , 2010, Chemphyschem : a European journal of chemical physics and physical chemistry.

[79]  Rajamani Krishna,et al.  Describing mixture diffusion in microporous materials under conditions of pore saturation , 2010 .

[80]  Fangyi Liang,et al.  Zeolitic imidazolate framework ZIF-7 based molecular sieve membrane for hydrogen separation , 2010 .

[81]  Henk Verweij,et al.  Synthesis of ultrathin zeolite Y membranes and their application for separation of carbon dioxide and nitrogen gases. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[82]  J. Caro,et al.  Mass transfer in a nanoscale material enhanced by an opposing flux. , 2010, Physical review letters.

[83]  Avelino Corma,et al.  New insights on CO2-methane separation using LTA zeolites with different Si/Al ratios and a first comparison with MOFs. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[84]  Bingbing Liu,et al.  Targeted synthesis of a 3D porous aromatic framework for selective sorption of benzene. , 2010, Chemical communications.

[85]  Y. Hwang,et al.  Adsorptive Separation of Propylene and Propane on a Porous Metal-Organic Framework, Copper Trimesate , 2010 .

[86]  Rajamani Krishna,et al.  Describing the Diffusion of Guest Molecules Inside Porous Structures , 2009 .

[87]  Juan Manuel Castillo-Sanchez,et al.  Adsorption and Diffusion of Water, Methanol, and Ethanol in All-Silica DD3R: Experiments and Simulations , 2009 .

[88]  A. Rodrigues,et al.  Single- and Multicomponent Vapor-Phase Adsorption of Xylene Isomers and Ethylbenzene in a Microporous Metal−Organic Framework , 2009 .

[89]  Rajamani Krishna,et al.  Unified Maxwell-Stefan description of binary mixture diffusion in micro- and meso-porous materials , 2009 .

[90]  W. Vermeiren,et al.  Impact of Zeolites on the Petroleum and Petrochemical Industry , 2009 .

[91]  Freek Kapteijn,et al.  An amine-functionalized MIL-53 metal-organic framework with large separation power for CO2 and CH4. , 2009, Journal of the American Chemical Society.

[92]  J. Caro,et al.  Butene isomers separation on titania supported MFI membranes at conditions relevant for practice , 2009 .

[93]  F. Kapteijn,et al.  Application of hydroxy sodalite films as novel water selective membranes , 2009 .

[94]  M. Hartmann,et al.  Adsorptive separation of isobutene and isobutane on Cu3(BTC)2. , 2008, Langmuir : the ACS journal of surfaces and colloids.

[95]  R. Krishna,et al.  Diffusion of hydrocarbon mixtures in MFI zeolite: Influence of intersection blocking , 2008 .

[96]  Rajamani Krishna,et al.  Onsager coefficients for binary mixture diffusion in nanopores , 2008 .

[97]  H. Gies,et al.  Liquid phase separation of 1-butene from 2-butenes on all-silica zeolite RUB-41. , 2008, Chemical communications.

[98]  Freek Kapteijn,et al.  Separation and permeation characteristics of a DD3R zeolite membrane , 2008 .

[99]  H. Verelst,et al.  Pore-filling-dependent selectivity effects in the vapor-phase separation of xylene isomers on the metal-organic framework MIL-47. , 2008, Journal of the American Chemical Society.

[100]  Jasper M. van Baten,et al.  Investigation of slowing-down and speeding-up effects in binary mixture permeation across SAPO-34 and MFI membranes , 2008 .

[101]  J. Llorens,et al.  Modeling Pervaporation of Ethanol/Water Mixtures within ‘Real' Zeolite NaA Membranes , 2008 .

[102]  Rajamani Krishna,et al.  Insights into diffusion of gases in zeolites gained from molecular dynamics simulations , 2008 .

[103]  G. Pirngruber,et al.  A complete experimental approach for synthesis gas separation studies using static gravimetric and column breakthrough experiments , 2007 .

[104]  Shuji Himeno,et al.  Synthesis and Permeation Properties of a DDR-Type Zeolite Membrane for Separation of CO2/CH4 Gaseous Mixtures , 2007 .

[105]  D. Ruthven,et al.  Adsorptive separation of light olefins from paraffins , 2007 .

[106]  Rajamani Krishna,et al.  Screening of zeolite adsorbents for separation of hexane isomers: A molecular simulation study , 2007 .

[107]  Rajamani Krishna,et al.  Modeling Permeation of CO2/CH4, CO2/N2, and N2/CH4 Mixtures Across SAPO-34 Membrane with the Maxwell-Stefan Equations , 2007 .

[108]  A. Rodrigues,et al.  Kinetic separation of hexane isomers by fixed-bed adsorption with a microporous metal-organic framework. , 2007, The journal of physical chemistry. B.

[109]  Rajamani Krishna,et al.  Interpreting Unary, Binary, and Ternary Mixture Permeation Across a SAPO-34 Membrane with Loading-Dependent Maxwell-Stefan Diffusivities , 2007 .

[110]  F. Kapteijn,et al.  Natural gas purification with a DDR zeolite membrane; permeation modelling with maxwell-stefan equations , 2007 .

[111]  A. Rodrigues,et al.  Separation by Fixed-Bed Adsorption of Hexane Isomers in Zeolite BETA Pellets , 2006 .

[112]  María A. Uguina,et al.  Fixed-bed adsorption of carbon dioxide–helium, nitrogen–helium and carbon dioxide–nitrogen mixtures onto silicalite pellets , 2006 .

[113]  R. Krishna,et al.  Describing Binary Mixture Diffusion in Carbon Nanotubes with the Maxwell-Stefan Equations. An Investigation Using Molecular Dynamics Simulations , 2006 .

[114]  J. Falconer,et al.  Separation of binary C5 and C6 hydrocarbon mixtures through MFI zeolite membranes , 2006 .

[115]  R. Krishna,et al.  Entropy effects in adsorption and diffusion of alkane isomers in mordenite: An investigation using CBMC and MD simulations , 2005 .

[116]  Y. Kawazoe,et al.  Highly controlled acetylene accommodation in a metal–organic microporous material , 2005, Nature.

[117]  H. Karge Infrared Spectroscopic Investigation of Diffusion, Co-Diffusion and Counter-Diffusion of Hydrocarbon Molecules in Zeolites , 2005 .

[118]  V. Nikolakis,et al.  Separation of Propylene/Propane Mixtures Using Faujasite-Type Zeolite Membranes , 2005 .

[119]  R. Snurr,et al.  Nonequilibrium molecular dynamics simulations of diffusion of binary mixtures containing short n-alkanes in faujasite , 2004 .

[120]  T. Tomita,et al.  Gas separation characteristics of DDR type zeolite membrane , 2004 .

[121]  Miguel Menéndez,et al.  Separation of CO2/N2 mixtures using MFI‐type zeolite membranes , 2004 .

[122]  Krista S. Walton,et al.  Consistency of energy and material balances for bidisperse particles in fixed-bed adsorption and related applications , 2003 .

[123]  Rajamani Krishna,et al.  Modelling issues in zeolite based separation processes , 2003 .

[124]  J. Falconer,et al.  Transport of C6 isomers through ZSM-5 zeolite membranes , 2003 .

[125]  D. Sholl,et al.  Correlation effects in diffusion of CH4/CF4 mixtures in MFI zeolite. A study linking MD simulations with the Maxwell-Stefan formulation , 2003 .

[126]  S. Sircar,et al.  Gas Separation by Zeolites , 2003 .

[127]  C. Jallut,et al.  Separation of mono- and dibranched hydrocarbons on silicalite , 2002 .

[128]  R. T. Yang,et al.  New adsorbents for purification: Selective removal of aromatics , 2002 .

[129]  B. Smit,et al.  Entropy effects during sorption of alkanes in zeolites. , 2002, Chemical Society reviews.

[130]  Katsuki Kusakabe,et al.  Separation of co2-ch4 and co2-n2 systems using ion-exchanged fau-type zeolite membranes with different si/al ratios , 2002 .

[131]  K. Sotowa,et al.  Separation of Mixtures of Benzene and n-Alkanes Using an FAU-Type Zeolite Membrane , 2002 .

[132]  Michael Tsapatsis,et al.  A titanosilicate molecular sieve with adjustable pores for size-selective adsorption of molecules , 2001, Nature.

[133]  R. T. Yang,et al.  Influence of Ag content and H2S exposure on 1,3-butadiene/1-butene adsorption by Ag ion-exchanged Y-zeolites (Ag-Y) , 2001 .

[134]  R. Krishna EXPLOITING CONFIGURATIONAL ENTROPY EFFECTS FOR SEPARATION OF HEXANE ISOMERS USING SILICALITE-1 , 2001 .

[135]  Alírio E. Rodrigues,et al.  Propylene/propane separation by vacuum swing adsorption using 13X zeolite , 2001 .

[136]  T. Matsufuji Separation of butane and xylene isomers with MFI-type zeolitic membrane synthesized by a vapor-phase transport method , 2000 .

[137]  N. Nishiyama,et al.  Permeation of hexane isomers through an MFI membrane , 2000 .

[138]  A. Jansen,et al.  Concentration and Chainlength Dependence of the Diffusivity of Alkanes in Zeolites Studied with MD Simulations , 2000 .

[139]  J. Falconer,et al.  Separation of hexane isomers through nonzeolite pores in ZSM-5 zeolite membranes , 1999 .

[140]  Freek Kapteijn,et al.  Modeling permeation of binary mixtures through zeolite membranes , 1999 .

[141]  B. Smit,et al.  Sorption-Induced Diffusion-Selective Separation of Hydrocarbon Isomers Using Silicalite , 1998 .

[142]  H. Verweij,et al.  Two component permeation through thin zeolite MFI membranes , 1998 .

[143]  D. Do,et al.  Adsorption analysis : equilibria and kinetics , 1998 .

[144]  R. T. Yang,et al.  Limits for Air Separation by Adsorption with LiX Zeolite , 1997 .

[145]  H. Verweij,et al.  Transport properties of alkanes through ceramic thin zeolite MFI membranes , 1996 .

[146]  R. Noble,et al.  Permeation of Aromatic Hydrocarbon Vapors through Silicalite−Zeolite Membranes , 1996 .

[147]  S. Farooq Sorption and diffusion of oxygen and nitrogen in molecular sieve RS-10 , 1995 .

[148]  R. Krishna,et al.  EXPERIMENTAL VERIFICATION OF THE MAXWELL-STEFAN THEORY FOR MICROPORE DIFFUSION , 1995 .

[149]  K. S. Knaebel,et al.  Pressure swing adsorption , 1993 .

[150]  J. Moulijn,et al.  High-temperature stainless steel supported zeolite (MFI) membranes: Preparation, module construction, and permeation experiments , 1993 .

[151]  H. Karge,et al.  Diffusion of p-xylene in single and binary systems in zeolites investigated by FTIR spectroscopy , 1993 .

[152]  K. Hidajat,et al.  A predictive model for a kinetically controlled pressure swing adsorption separation process , 1993 .

[153]  Douglas M. Ruthven,et al.  Numerical simulation of a pressure swing adsorption oxygen unit , 1989 .

[154]  J. Dranoff,et al.  Competitive adsorption of methane and ethane on 4A zeolite , 1987 .

[155]  R. T. Yang,et al.  Gas Separation by Adsorption Processes , 1987 .

[156]  Douglas M. Ruthven,et al.  Principles of Adsorption and Adsorption Processes , 1984 .

[157]  J. Kärger,et al.  Theoretical prediction of uptake behaviour in adsorption kinetics of binary gas mixtures using irreversible thermodynamics , 1975 .

[158]  Alan L. Myers,et al.  Thermodynamics of mixed‐gas adsorption , 1965 .

[159]  H. Habgood THE KINETICS OF MOLECULAR SIEVE ACTION. SORPTION OF NITROGEN–METHANE MIXTURES BY LINDE MOLECULAR SIEVE 4A , 1958 .