Effects of Impregnation Sequence of Ni and Ce Impregnation Liquids on Performance of the Catalysts for Crude Caprolactam Hydrogenation Purification
1. College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
2. Catalytic Hydrogenation Engineering Technology Research Center, Nuomeng Chem, Nanjing 210009, China
Abstract Using nickel nitrate and cerium nitrate as impregnation liquids and γ-Al2O3 as supporter, a series of supported catalysts were prepared with different adding order of impregnationliquids. The effects of different impregnation sequence on the structure and properties of catalysts were characterized by specific surface area(BET) analysis, X-ray diffraction(XRD) and hydrogen temperature-programmed reduction (H2-TPR). The catalytic performance of various catalysts for the crude caprolactam purification was investigated in a fixed bed reactor. It was found that the NiO/CeO2/γ-Al2O3 catalyst prepared by fractional impregnation using Ce(NO3)3, Ni(NO3)2 sequentially impregnated supported on γ-Al2O3 had a better catalytic performance and stability. Under the reaction conditions of temperature 90 ℃, pressure 0.8 MPa, liquid hourly space velocity(LHSV) 0.8 h-1 and volume of H2 to liquid 75, the permanganate number(PM number) of the crude caprolactam purification over NiO/CeO2/γ-Al2O3 catalyst could be stable at 22 000 s.
Liu Sen1,Wang Chongqing1,Chen Xiaorong1 et al. Effects of Impregnation Sequence of Ni and Ce Impregnation Liquids on Performance of the Catalysts for Crude Caprolactam Hydrogenation Purification[J]. 化学反应工程与工艺, 2016, 32(2): 158-163.
Liu Sen1,Wang Chongqing1,Chen Xiaorong1 et al. Effects of Impregnation Sequence of Ni and Ce Impregnation Liquids on Performance of the Catalysts for Crude Caprolactam Hydrogenation Purification[J]. 化学反应工程与工艺, 2016, 32(2): 158-163.
