Enhanced performance in catalytic combustion of toluene over mesoporous Beta zeolite-supported platinum catalyst

Mesoporous Beta zeolite-supported Pt catalyst (Pt–R/Beta-H) exhibits much higher catalytic activities and longer catalyst life as well as lower apparent activation energy in combustion of toluene than conventional Beta zeolite-supported Pt catalyst (Pt–R/Beta). This phenomenon could be strongly rela...

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Published in:Applied catalysis. B, Environmental Vol. 140-141; pp. 199 - 205
Main Authors: Chen, Chunyu, Zhu, Jie, Chen, Fang, Meng, Xiangju, Zheng, Xiaoming, Gao, Xionghou, Xiao, Feng-Shou
Format: Journal Article
Language:English
Published: Kidlington Elsevier B.V 01.08.2013
Elsevier
Subjects:
Catalysis
Catalytic combustion
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Ion-exchange
Mesoporous Beta zeolite
Porous materials
Supported platinum catalyst
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Toluene
Volatile organic compounds (VOCs)
Zeolites: preparations and properties
Mesoporous Beta zeolite
Supported platinum catalyst
Catalytic combustion
Toluene
Volatile organic compounds (VOCs)
Hydrocarbon
Transition metal
Volatile organic compound
Porous material
Molecular sieve
Supported catalyst
Mesoporosity
Heterogeneous catalysis
Platinum
Benzenic compound
Environmental protection
ISSN:0926-3373, 1873-3883
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Summary:Mesoporous Beta zeolite-supported Pt catalyst (Pt–R/Beta-H) exhibits much higher catalytic activities and longer catalyst life as well as lower apparent activation energy in combustion of toluene than conventional Beta zeolite-supported Pt catalyst (Pt–R/Beta). This phenomenon could be strongly related to the presence of mesoporosity in Beta-H zeolite, which is favorable for mass transfer and dispersion of Pt particles. •Zeolite-supported Pt catalysts are prepared by incipient wetness impregnation.•Mesoporous Beta catalyst performs excellently in the combustion of toluene.•Mesoporous Beta catalyst has higher activities and longer life than conventional one.•Mesoporosity in zeolite is favorable for mass transfer and Pt particles dispersion.•Reduced mesoporous Pt catalyst performs much lower activation energies (37–46kJ/mol). Removal of volatile organic compounds (VOCs) has recently been attracted much attention, and catalytic combustion is one of good methods for solving this problem. In this research, we show a successful preparation of mesoporous Beta zeolite-supported Pt catalyst (Pt–R/Beta-H) and its superior performance in the catalytic combustion of toluene. N2 sorption isotherms show that the mesopore volume of Pt–R/Beta-H reaches 0.18cm3/g, and TEM images exhibit that the Pt particles exist in both micropores and mesopores of the sample. Interestingly, the Pt particles on Pt–R/Beta-H have higher dispersion than the Pt particles on conventional Beta zeolite (Pt–R/Beta). XPS spectra also reveal that Pt–R/Beta-H has higher Pt0/Pt2+ ratio than Pt–R/Beta. Very importantly, Pt–R/Beta-H exhibits much higher catalytic activities and longer catalyst life as well as lower apparent activation energy in the catalytic combustion of toluene than Pt–R/Beta. The extraordinary performance in the catalytic combustion of toluene over Pt–R/Beta-H catalyst is of great importance for obtaining clean environment and enhancing human health.
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ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2013.03.050