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

• Published in: Catalysis letters 2020-09, Vol.150 (9), p.2660-2673
• Main Authors: Shang, Fangfang, Chu, Qingyan, Yang, Haiyu, Yu, Haoxuan, Diao, Tonghe, Wang, Ping, Liu, Hui, Wang, Ming
• Format: Article
• Language: English
• Subjects: Adsorption; Alloying; Bimetals; Cascade chemical reactions; Catalysis; Catalysts; Catalytic activity; Catalytic converters; Chemistry; Chemistry and Materials Science; Crystal structure; Crystals; Diffraction; Esterification; Gold; Green market; Hydrolysis; Industrial Chemistry/Chemical Engineering; Mixed oxides; Nanoparticles; Organometallic Chemistry; Oxidation; Oxides; Palladium; Physical Chemistry; Pore size; Porosity; Pressure effects; Selectivity; Silicon dioxide; Structure; Sulfuric acid; Synergistic effect; Ultrasonic testing; X-rays; Zinc oxide
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-020-03142-x

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 SiO 2 mixed oxides incorporating K 2+ and Al 3+ like promoters were prepared by equivalent volume impregnation, which is using catalyzed the tandem reaction. Homo-dispered ZnO–S 2 O 8 2− 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–S 2 O 8 2− /ZSM-5 exhibited more excellent than H 2 SO 4 and other reported catalysts with 100% conversion and selectivity. The excellent catalytic activity of ZnO–S 2 O 8 2− /ZSM-5 may be attributed to the synergistic effect from the nano-effect of ZnO–S 2 O 8 2− nanoparticles and the mesostructure of ZSM-5, and the pore size, number of Brönsted 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. Graphic Abstract Atom economic green reaction: acetyl oxidation and hydrolysis reaction.