A Ni-Fe alloy supported by active carbon efficiently promotes the vapor phase catalytic carbonylation of ethanol
NEW JOURNAL OF CHEMISTRY(2023)
摘要
Vapor phase carbonylation of ethanol is an effective way to produce propionic acid. Monometallic nickel-based catalysts stand out because of their low preparation cost and relatively high catalytic performance. However, the monometallic nickel-based catalysts have the disadvantages of easy sintering of the metal, poor dispersibility and insufficient number of active centers. In this study, Ni-Fe/AC catalysts were prepared by changing the proportion of Ni-Fe loading for the vapor phase carbonylation of ethanol. The physicochemical properties of the Ni-Fe/AC catalysts were characterized by XRD, TEM, XPS, H-2-TPR and BET. It was found that Ni-Fe alloy was formed in the catalyst after Fe was introduced into Ni/AC. The strong interaction between Ni and Fe inhibits the sintering of the metal and improves the dispersibility of the metal particles. The H-2-TPR results showed that the synergy between Ni and Fe reduced the reduction temperature of NiO and promoted the reduction of NiO. The content of Ni-0 on the catalyst surface was further characterized by XPS. The results showed that the content of active centers Ni-0 increased from 10.49% to 20.46% (1Ni-1Fe/AC) after the promoter metal Fe was introduced, which provided more active sites. The experimental results showed that the 1Ni-1Fe/AC catalyst (Ni : Fe = 1 : 1, wt%) displayed the highest catalytic performance, and the co-selectivity of propionic acid (PA) and ethyl propionate (EP) increased by 11%, and the space-time yield (STY) of PA and EP was about twice that of the Ni/AC catalyst.
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关键词
catalytic carbonylation,active carbon
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