title: Synergistic effect of Brønsted acid and platinum on purification of automobile exhaust gases.
abstract: The catalytic purification of automobile exhaust gases (CO, NOx and hydrocarbons) is one of the most practiced conversion processes used to lower the emissions and to reduce the air pollution. Nevertheless, the good performance of exhaust gas purification catalysts often requires the high consumption of noble metals such as platinum. Here we report that the Brønsted acid sites on the external surface of a microporous silicoaluminophosphate (SAPO) act as a promoter for exhaust gas purification, effectively cutting the loading amount of platinum in the catalyst without sacrifice of performance. It is revealed that in the Pt-loaded SAPO-CHA catalyst, there exists a remarkable synergistic effect between the Brønsted acid sites and the Pt nanoparticles, the former helping to adsorb and activate the hydrocarbon molecules for NO reduction during the catalytic process. The thermal stability of SAPO-CHA also makes the composite catalyst stable and reusable without activity decay.
authors.affiliation: School of Chemistry and Chemical Engineering, Hirano Institute for Materials Innovation, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Fu
authors.forename: Xin-Hao
authors.initials: XH
authors.lastname: Li
authors.forename: Hong-Liang
authors.initials: HL
authors.lastname: Bao
authors.forename: Kai-Xue
authors.initials: KX
authors.lastname: Wang
authors.forename: Xiao
authors.initials: X
authors.lastname: Wei
authors.forename: Yi-Yu
authors.initials: YY
authors.lastname: Cai
authors.forename: Jie-Sheng
authors.initials: JS
authors.lastname: Chen
mesh_terms: D000143:Acids / Q000737:chemistry*; D000393:Air Pollutants / Q000737:chemistry* / Q000302:isolation & purification*; D002384:Catalysis; D005740:Gases / Q000737:chemistry* / Q000302:isolation & purification*; D008422:Materials Testing; D010984:Platinum / Q000737:chemistry*; D001335:Vehicle Emissions / Q000032:analysis / Q000517:prevention & control*
chemical_list: D000143:Acids; D000393:Air Pollutants; D005740:Gases; D001335:Vehicle Emissions; D010984:Platinum
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