Double Catalyst-Catalyzed: An Environmentally Friendly Sustainable Process to Produce Methallyl Alcohol

Abstract

A green, sustainable process route to produce methallyl alcohol via tandem reaction concluding α-H oxidation, esterification and hydrolysis reaction is discussed. Pd–Au bimetallic nanocatalysts over SiO2 mixed oxides incorporating K2+ and Al3+ like promoters were prepared by equivalent volume impregnation, which is using catalyzed the tandem reaction. Homo-dispered ZnO–S2O82− nanoparticles supported on ZSM-5 were prepared by ultrasonic adsorption method, which is using catalyzed hydrolysis reaction. Characterization by transmission electron microscopy confirmed that alloyed Pd/Au nanoparticles with a mean diameter of 0.5 to 1.0 nm were formed. The results of X-ray diffraction confirmed that the crystal structure were Pd/Au(111). The electronic effect and geometric effect of Pd/Au significantly improved the catalytic performance. The effects of reaction pressure, temperature, and ratio of material were discussed in details. The catalytic activity of ZnO–S2O82−/ZSM-5 exhibited more excellent than H2SO4 and other reported catalysts with 100% conversion and selectivity. The excellent catalytic activity of ZnO–S2O82−/ZSM-5 may be attributed to the synergistic effect from the nano-effect of ZnO–S2O82− nanoparticles and the mesostructure of ZSM-5, and the pore size, number of Bronsted acid sites. The reaction temperature are critical factors affecting the catalytic activity for this system. Based on the results, a supposed mechanism of the tandem and hydrolysis reaction was proposed. Atom economic green reaction: acetyl oxidation and hydrolysis reaction.