Hard coke blockage of micropores of acidic zeolites generally causes serious catalytic deactivation for many chemical processes. Herein, we report a facile method to synthesize H-mordenite nanosheet assemblies without using any template agent. The assemblies exhibit the high catalytic activity for carbonylation of dimethyl ether because of their large quantity of framework Brønsted acids. The specific morphology of the nanosheet unites improves mass diffusion for both reactants and products. Consequently, the coke precursor species can readily migrate from the micropores to the external surface of the assemblies, inducing the improved catalytic stability through inhibiting hard coke formation in frameworks.

No abstract

No abstract

Herein, we introduce a La 1Àx Sr x CoO 3 perovskite catalyst, substituting for Pt containing LNT catalysts, to remove efficiently NO x from lean-burn engines. The NO x storage/reduction occurred alternatively on the perovskite in successive lean/rich atmospheres, and the NO x conversion reached 71.4% with 100% selectivity to N 2 at 300 C.