Structural Modulation of Ni/ZSM-12 Catalyst by Organic Ligands and Its Performance for Acetylene Semi-Hydrogenation
GUAN Tong, SUN Xueming, ZHANG Chong, ZHANG Rongbin, YE Runping, FENG Gang
Jiangxi Provincial Key Laboratory of Environmental and Energy Catalysis, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, China
Abstract：Ni-based catalysts have important research value in the reaction of acetylene semi-hydrogenation to ethylene due to their excellent hydrogenation activity. However, owing to the high activity of Ni-based catalysts supported by a single carrier, acetylene is prone to excessive hydrogenation resulting in low ethylene yield. In this work, ZSM-12 zeolites were used as carriers, and organic ligands such as ethylenediaminetetraacetic acid (EDTA), diethylenetriamine (DETA), dextrin (D) and cyclodextrin (CD) were added in situ during the synthesis process of zeolite to modify their structural properties, and they were used in acetylene semi-hydrogenation reaction. The results showed that the addition of different organic ligands had no great effects on the morphology and crystal structure of the catalysts, but adding EDTA organic ligand could make Ni disperse in the ZSM-12 more uniformly, which could increase the number and strength of acidic sites on the catalyst surface in order to reduce the adsorption of ethylene on the catalyst. The results showed that the catalyst with EDTA organic ligand (Ni-EDTA/ZSM-12) could improve the ethylene selectivity, and it had the optimized catalytic performance at 225 ℃ and the space velocity of 9 000 mL/(g?h), with the acetylene conversion of 100% and the ethylene yield of 56.2%.
GUAN Tong,SUN Xueming,ZHANG Chong et al. Structural Modulation of Ni/ZSM-12 Catalyst by Organic Ligands and Its Performance for Acetylene Semi-Hydrogenation[J]. Chemical Reaction Engineering and Technology, 2025, 41(6): 685-693.
