The role of pillaring in MCM-22 on the dispersion of noble metals and catalytic activity

• Pillaring of MCM-22 by silica source increases the metal dispersion.
• During CO oxidation the surface of Au-MCM-22-pil is activated.
• The activity of Pt-MCM-22-pil does not change in the second cycle of CO oxidation.
• Pillaring enhances Au-MCM-22-pil activity and selectivity to MF in MeOH oxidation.

The aim of this work was to evaluate the effect of pillaring of MCM-22 zeolite on Pt and Au dispersion and catalytic activity in CO and methanol oxidation as well as to analyze the similarities and differences in the surface and catalytic properties of Au and Pt loaded on pillared MCM-22-pil. The role of pillaring in the functionalization by APTMS (3-aminopropyl-trimethoxysilane) before metal loading was also considered. The difference in the effect of platinum and gold dispersion on the rate of CO oxidation confirmed reports in the literature. The stability of Pt-containing zeolites in CO oxidation for the second run of the reaction is pointed out. An increase in activity of gold catalysts in the second cycle of the reaction was found and is discussed. The difference found in the methanol conversion and selectivity in alcohol oxidation between gold-containing MCM-22 and MCM-22-pil is discussed.

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