Catalytic oxidation of VOCs over Al- and Fe-pillared montmorillonite

Al- and Fe-pillared montmorillonite (Al- and Fe-PILCs) were prepared and examined as catalysts in the deep oxidation of toluene and chlorobenzene. The catalysts before and after reaction were characterized by X-ray powder diffraction, N-2 adsorption, scanning electron microscopy, and energy dispersive X-ray spectrometer. Results show that Al- and Fe-PILCs with layer structures increase the surface area. For the catalytic oxidation of volatile organic compounds (VOCs), Fe-PILCs exhibit higher performance than fresh montmorillonite and Al-PILCs. Higher concentration of Fe also resulted in higher catalytic activity. Fe-PILCs also exhibited higher stability than Al-PILCs. Even at a low temperature (100 degrees C), Fe-PILCs still exhibited certain activity. Lifetime evaluation results show that the activity of Fe-PILC (3) did not vary after a 96-hour reaction. BET and XRD results indicate that these pillared catalysts have very stable structures even after prolonged reaction. Hence, Fe-PILCs are potential materials for VOC decontamination. (C) 2013 Elsevier B.V. All rights reserved.

[1]  M. Önal,et al.  The effect of sulphuric acid activation on the crystallinity, surface area, porosity, surface acidity, and bleaching power of a bentonite , 2007 .

[2]  R. Zanoni,et al.  Vapour phase deep oxidation of chlorinated hydrocarbons catalyzed by pillared bentonites , 1995 .

[3]  M. Al-Dahhan,et al.  Activity and stability of iron-containing pillared clay catalysts for wet air oxidation of phenol , 2006 .

[4]  Chunshan Li,et al.  Tar property, analysis, reforming mechanism and model for biomass gasification—An overview , 2009 .

[5]  L. M. Gandía,et al.  Preparation and characterization of manganese oxide catalysts supported on alumina and zirconia-pillared clays , 2000 .

[6]  Toshiaki Mori,et al.  Preparation of alumina-pillared montmorillonite with desired pillar population , 1988 .

[7]  M. Hattori,et al.  High surface area solids obtained by intercalation of iron oxide pillars in montmorillonite , 1984 .

[8]  P. Olivera-Pastor,et al.  Catalytic behavior of chromia and chromium-doped alumina pillared clay materials for the vapor phase deep oxidation of chlorinated hydrocarbons , 1997 .

[9]  Kenzi Suzuki,et al.  Kinetic analyses of biomass tar pyrolysis using the distributed activation energy model by TG/DTA technique , 2009 .

[10]  S. Balci,et al.  Characterization of Al, Cr-pillared clays and CO oxidation , 2009 .

[11]  Toshiaki Mori,et al.  Control of the distance between the silicate layers of hectorite by pillaring with alumina in the presence of polyvinyl alcohol , 1991 .

[12]  R. T. Yang,et al.  Selective catalytic reduction of NO with hydrocarbon on Cu2+-exchanged pillared clay: An IR study of the NO decomposition mechanism , 1999 .

[13]  Chunshan Li,et al.  Kinetics of Perovskite Catalyzed Biomass Tar Combustion Studied by Thermogravimetry and Differential Thermal Analysis , 2009 .

[14]  R. Lago,et al.  Catalytic oxidation of aromatic VOCs with Cr or Pd-impregnated Al-pillared bentonite: Byproduct formation and deactivation studies , 2008 .

[15]  Sevil Veli,et al.  Adsorption of copper and zinc from aqueous solutions by using natural clay. , 2007, Journal of hazardous materials.

[16]  Toshiaki Mori,et al.  Preparation of Delaminated Clay Having a Narrow Micropore Distribution in the Presence of Hydroxyaluminum Cations and Polyvinyl Alcohol , 1988 .

[17]  M. Saidi,et al.  Fe-pillared clay as a Fenton-type heterogeneous catalyst for cinnamic acid degradation. , 2006, Journal of environmental management.

[18]  M. Trombetta,et al.  Solid acid catalysts from clays evaluation of surface acidity of mono- and bi-pillared smectites by FT-IR spectroscopy measurements, NH3-TPD and catalytic tests , 2000 .

[19]  X. Verykios,et al.  Combustion of non-halogenated volatile organic compounds over group VIII metal catalysts , 1997 .

[20]  P. Ruiz,et al.  Synthesis, characterisation, catalytic activity and structural stability of LaCo1-yFeyO3 ± λ perovskite catalysts for combustion of ethanol and propane , 2006 .

[21]  M. Labaki,et al.  Total oxidation of propene and toluene in the presence of zirconia doped by copper and yttrium , 2003 .

[22]  S. Sciré.  Pt catalysts supported on H-type zeolites for the catalytic combustion of chlorobenzene , 2003 .

[23]  M. Pina,et al.  Preparation and characterization of Ce-Zr and Ce-Mn based oxides for n-hexane combustion: Application to catalytic membrane reactors , 2007 .

[24]  J. González-Velasco,et al.  Catalytic purification of waste gases containing VOC mixtures with Ce/Zr solid solutions , 2006 .

[25]  M. Önal,et al.  The Effect of Heating on the Surface Area, Porosity and Surface Acidity of a Bentonite , 2006 .

[26]  F. Kapteijn,et al.  Carbon-based monolithic supports for palladium catalysts: The role of the porosity in the gas-phase total combustion of m-xylene , 2008 .

[27]  V. Doronin,et al.  Cu, Co, Ag-Containing Pillared Clays as Catalysts for the Selective Reduction of NOx by Hydrocarbons in an Excess of Oxygen , 2001 .

[28]  L. Cadús,et al.  Synthesis and characterisation of La1−xCaxFeO3 perovskite-type oxide catalysts for total oxidation of volatile organic compounds , 2006 .

[29]  Suojiang Zhang,et al.  Characterization and thermal behavior of kaolin , 2011 .

[30]  F. Garin,et al.  Catalytic behaviour of combined palladium-acid catalysts: use of Al and Zr-pillared montmorillonite as supports: Part I. Reactivity of linear, branched and cyclic hexane hydrocarbons , 2001 .