Investigation of the active sites and optimum Pd/Al of Pd/ZSM–5 passive NO adsorbers for the cold-start application: Evidence of isolated-Pd species obtained after a high-temperature thermal treatment

Jaeha Lee,YoungSeok Ryou,Sung June Cho,Hyokyoung Lee,Chang Hwan Kim,Do Heui Kim

Applied Catalysis B: Environmental（2018）

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摘要

•Oxidative treatments at 750 °C activated the NO adsorption ability of Pd/ZSM-5.•Isolated Pd species were formed in ZSM-5 after the oxidative treatment at 750 °C.•Ionic Pd species turned out to be the active site for adsorbing NO.•Optimum Pd to Al molar ratio for NO adsorption was found at 0.25.

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Low temperature,Pd/ZSM-5,NO adsorption site,Si-to-Al molar ratio

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