SJTU team finds way to reduce platinum loading in three-way catalyst without sacrificing performance
A team at Shanghai Jiao Tong University (SJTU) in China reports on a way to reduce the platinum loading in automotive three-way catalysts (for CO, NOx and hydrocarbon treatment) without sacrificing performance. An open-access paper on the work is published in the journal Scientific Reports.
The team found that Brønsted acid sites on the external surface of a microporous silicoaluminophosphate (SAPO) catalyst support act as a promoter for exhaust gas purification, effectively enabling the reduction in loading.
They reported that in the Pt-loaded SAPO-CHA catalyst, there is a 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.
Wei Fu, Xin-Hao Li, Hong-Liang Bao, Kai-Xue Wang, Xiao Wei, Yi-Yu Cai and Jie-Sheng Chen (2013) Synergistic effect of Brønsted acid and platinum on purification of automobile exhaust gases. Scientific Reports 3, Article number: 2349 doi: 10.1038/srep02349