Improvement of Limestone-Based CO2 Sorbents for Ca Looping by HBr and Other Mineral Acids

The effects of mineral-acid doping on the long-term reactivity of limestone-based sorbents for CO2 capture was investigated in this work. Havelock (Canada), Longcliffe (U.K.), and Purbeck (U.K.) limestones were doped with a range of mineral acids (HCl, HBr, HI, and HNO3), and the effects of concentration were also studied. Doped samples were subjected to repeated cycles of carbonation and calcination in a fluidized-bed reactor. The experimental results showed that HBr and HCl as dopants with a 0.167 mol % doping concentration significantly improved the long-term reactivity of Havelock and Longcliffe limestones (doping with HI marginally improved the reactivity); however, doping Havelock limestone with a similar concentration of HNO3 reduced its CO2 uptake. Purbeck limestone was not significantly improved in reactivity by any dopant. Gas adsorption analyses showed that sorbents have a very small surface area: less than 4 m2/g. The pore size distribution appears to change significantly upon doping for those...

[1]  P. Fennell,et al.  Investigation into potential synergy between power generation, cement manufacture and CO2 abatement using the calcium looping cycle , 2011 .

[2]  J. Carlos Abanades,et al.  Calcium looping for CO2 capture: sorbent enhancement through doping , 2011 .

[3]  E. Teller,et al.  ADSORPTION OF GASES IN MULTIMOLECULAR LAYERS , 1938 .

[4]  N. Cai,et al.  Rate Equation Theory for the Carbonation Reaction of CaO with CO2 , 2012 .

[5]  Xiaoping Chen,et al.  Cyclic CO2 capture behavior of KMnO4-doped CaO-based sorbent , 2010 .

[6]  Ruifeng Li,et al.  Adsorption of carbon dioxide on alkali-modified zeolite 13X adsorbents , 2007 .

[7]  Robert H. Borgwardt,et al.  Sintering of nascent calcium oxide , 1989 .

[8]  Paul S. Fennell,et al.  The calcium looping cycle for large-scale CO2 capture , 2010 .

[9]  Meihong Wang,et al.  Post-combustion CO2 capture with chemical absorption: A state-of-the-art review , 2011 .

[10]  V. Manović,et al.  CO2 looping cycles with CaO-based sorbent pretreated in CO2 at high temperature , 2009 .

[11]  Paul S. Fennell,et al.  The calcium looping cycle for CO2 capture from power generation, cement manufacture and hydrogen production , 2011 .

[12]  Hermann Hofbauer,et al.  Comparison of dual fluidized bed steam gasification of biomass with and without selective transport of CO2 , 2009 .

[13]  Mónica Alonso,et al.  Sorbent attrition in a carbonation/calcination pilot plant for capturing CO2 from flue gases , 2010 .

[14]  D. Harrison.  Sorption-Enhanced Hydrogen Production: A Review , 2008 .

[15]  V. Manović,et al.  Lime-Based Sorbents for High-Temperature CO2 Capture—A Review of Sorbent Modification Methods , 2010, International journal of environmental research and public health.

[16]  P. Fennell,et al.  Effects of Different Dopants and Doping Procedures on the Reactivity of CaO-based Sorbents for CO2 Capture , 2012 .

[17]  A. I. Lysikov,et al.  Change of CO2 Carrying Capacity of CaO in Isothermal Recarbonation−Decomposition Cycles , 2007 .

[18]  John F. Davidson,et al.  The Effects of Repeated Cycles of Calcination and Carbonation on a Variety of Different Limestones, as Measured in a Hot Fluidized Bed of Sand , 2007 .

[19]  Vasilije Manovic,et al.  Thermal activation of CaO-based sorbent and self-reactivation during CO2 capture looping cycles. , 2008, Environmental science & technology.

[20]  Arthur M. Squires,et al.  Cyclic Calcination and Recarbonation of Calcined Dolomite , 1977 .

[21]  D. Littlejohn,et al.  Characterization of condensed phase species produced during the thermal treatment of metal chlorides on a graphite platform using surface analysis techniques , 2004 .

[22]  J. C. Abanades,et al.  Conversion Limits in the Reaction of CO2 with Lime , 2003 .

[23]  E. Barrett,et al.  (CONTRIBUTION FROM THE MULTIPLE FELLOWSHIP OF BAUGH AND SONS COMPANY, MELLOX INSTITUTE) The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen Isotherms , 1951 .

[24]  J. Carlos Abanades,et al.  CO2 Capture Capacity of CaO in Long Series of Carbonation/Calcination Cycles , 2006 .

[25]  Nicholas H. Florin,et al.  Influence of high-temperature steam on the reactivity of CaO sorbent for CO₂ capture. , 2012, Environmental science & technology.

[26]  J. S. Dennis,et al.  The rate and extent of uptake of CO2 by a synthetic, CaO-containing sorbent , 2009 .

[27]  P. Fennell,et al.  Mechanism of Particle Breakage during Reactivation of CaO-Based Sorbents for CO2 Capture , 2010 .

[28]  P. Cobden,et al.  CaO sorbent stabilisation for CO2 capture applications , 2011 .

[29]  L. Fan,et al.  Carbonation−Calcination Cycle Using High Reactivity Calcium Oxide for Carbon Dioxide Separation from Flue Gas , 2002 .

[30]  John R. Grace,et al.  Investigation of Attempts to Improve Cyclic CO2 Capture by Sorbent Hydration and Modification , 2008 .

[31]  C. Wen,et al.  A generalized method for predicting the minimum fluidization velocity , 1966 .