Experimental Study on the Deactivation Behavior of NiMo/γ-Al 2 O 3 Catalyst during the Hydrogenation of Methyl Acrylate

作者：Taolue Sun, Guoliang Zhang, Haifeng Dong, Guiyang Sheng, Junping Zhang, Bing Wang, Gang Wang, Chunshan Li, Zengxi Li · 发表于：Industrial & Engineering Chemistry Research · 年份：2025 · DOI：10.1021/acs.iecr.5c01342 · 被引用次数：4 · 研究领域：Catalysts for Methane Reforming、Catalysis and Hydrodesulfurization Studies、Catalytic Processes in Materials Science

It is of great significance to determine the deactivation behavior for the development of highly efficient and stable catalysts. In this work, the deactivation and regeneration experiments were investigated for NiMo/γ-Al 2 O 3 catalysts during the hydrogenation of methyl acrylate at 80 °C, 1 MPa H 2, n (H 2 )/ n (l) = 10, and WHSV = 1 h –1 . Multiple characterization techniques, including XRD, UV–vis DRS, H 2 -TPR, XPS, TEM, and TG, were employed for the analysis of deactivated and regenerated catalysts. The fresh catalysts exhibited good catalytic hydrogenation performance with a 99.7% yield of methyl propionate and 1002 h time-on-stream stability; however, the catalytic durability after the first and second regeneration is remarkably decreased to 600 and 299 h. The detailed analysis results demonstrated that the first-stage deactivation of the catalyst was attributed to the deposition of carbonaceous compounds on catalyst surface during the hydrogenation process. While the second- and third-stage deactivation should be caused by carbonaceous accumulation, formation of NiAl 2 O 4 through strong interaction between the Ni species and Al 2 O 3 support, and sintering of active component particles, which may be due to the loss of molybdenum. Specifically, the catalyst deactivation derived from carbon deposition can be recovered under thermal treatment at 450 °C, but NiAl 2 O 4 generation and active component aggregation are irreversible.