Journal of the Chemical Society - Faraday Transactions p. 3507 - 3512 (1993)
Update date:2022-08-30
Topics:
Medina, Francisco
Salagre, Pilar
Sueiras, Jesus-Eduardo
Fierro, Jose-Luis-Garcia
Studies of the chemical preparation, X-ray photoelectron spectra (XPS), activation energies of reduction, temperature-programmed reduction (TPR), X-ray diffraction (XRD) and catalytic activities of several nickel/α-alumina catalysts have been caried out for the catalytic hydrogenation of hexanedinitrile, in a continuous process at 1 atm pressure, 443 K, and in the absence of ammonia.XPS results show complete reduction of non-stoichiometric NiO on α-alumina at temperatures higher than 623 K and higher surface nickel dispersion with increasing nickel content anddecreasing reduction temperatures.Activation energies of reduction for the α-alumina-supported non-stoichiometric NIO were higher than those of the unsupported non-stoichiometric NiO.TPR results show that the initial and final temperatures of reduction of the α-alumina-supported nonstoichiometric NiO are higher with unsupported NiO, confirming the inhibiting effect of α-alumina on NiO reduction.XRD measurements show the presence of α-alumina, NiO and Ni phases, and also the increase in crystallite size with increasing reduction temperature.Catalytic conversions increase with the nickel content and selectivities toward 6-aminohexanenitrile increase at lower nickel contents, high space velocities, and higher metallic sintering, probably owing to the presence of a higher content of specific crystal sites responsible for the production of 6-aminohexanenitrile.A mechanism is proposed.
View MoreContact:+86-371-67759225
Address:No.32, Jinsuo Road, High-tech Zone
Shanghai Bocimed Pharmaceutical Co., Ltd.
website:http://www.bocimed.com
Contact:+86-21-68861632
Address:Building 1, Lane 647, Songtao Road, Zhangjiang High-Tech Park, Shanghai
Contact:+49-9398-993127
Address:Untertorstr. 27
Wuhan Better Organic Technology Inc.
Contact:13307163183
Address:Wuhan Economic&Technology Development Zone, Hubei
BAODING SINO-CHEM INDUSTRY CO.,LTD
Contact:0312-5956088
Address:NO.8 FUXING ROAD,CHINA
Doi:10.1039/c39830001196
(1983)Doi:10.1039/c1cc00108f
(2011)Doi:10.1002/anie.201004729
(2011)Doi:10.1007/BF02549323
(1994)Doi:10.1002/anie.202005844
(2020)Doi:10.1039/c3ob40162f
(2013)
