In this work

a series of Mg-Sn-W oxide powder catalysts with different tungsten oxide contents (0

15 wt% and 30 wt%) were prepared and washcoated on cordierite honeycomb monoliths to produce monolithic catalysts

which were tested for the Baeyer-Villiger oxidation of cyclohexanone. The obtained monolithic catalysts

which combined the advantages of both homogeneous and heterogeneous catalysts

showed high catalytic efficiency and overcame the problems of product separation that occurred in the homogeneous catalytic process. SEM and EDX tests showed that the catalytic coating

with a thickness of approximately 20 μm

was compact and homogeneous

and an enlarged BET surface area was indicated by N

2

adsorption-desorption compared with the bare cordierite honeycomb. The chemical properties on the catalytic surface of the powder and monolithic catalysts were characterized by XPS

which indicated the tin and tungsten on the catalysts exhibited their full oxide states and presented mainly as stannate and tungstate

as confirmed by XRD and FTIR characterizations. Moreover

the catalytic activity test indicated that the tungsten content of the cata

lysts played an important role in catalytic efficiency and that monolithic catalysts were produced without obvious catalytic activity loss compared with the corresponding powders. (M)W30

which exhibited excellent mechanical stability and maintained high activity after recycling three times

was the optimal catalyst

showing a high selectivity that exceeded 86% and a conversion above 64%. Therefore

the structured Mg-Sn-W oxide catalysts have great potential for application in practical production.