Mechanical pressure-mediated Pd active sites formation in NaY zeolite catalysts for indirect oxidative carbonylation of methanol to dimethyl carbonate

The structural transformation of metal-containing zeolite catalysts subjected to mechanical compression is often disregarded in the preparation catalysts. Herein, impact on catalytic active sites Pd/NaY responsible for indirect oxidative carbonylation methanol dimethyl carbonate (DMC) has been disclosed. DMC selectivity was found strongly depend mechanical-pressure applied, as pressure controlled ratio Pd(2+δ)+ and Pdδ+ species (0 < δ ≤ 2) mono-dispersed Pd clusters (1.3 nm) catalyst were obtained under treatment 300 MPa. This showed high CO conversion 89% 83%, that maintained at least 150 h. Combining experimental density functional theory studies, we revealed rather than enhanced adsorption CH3ONO reactants inhibited decomposition reactant into byproducts, thus selectivity. applied had a noticeable effect features catalysts, but despite its importance, this aspect poorly considered field heterogenous catalysis.