Journal of the Chemical Society - Faraday Transactions p. 1413 - 1421 (1996)
Update date:2022-08-29
Topics:
Keane, Mark A.
Patterson, Patricia M.
The vapour phase hydrogenation of benzene, toluene and o-xylene has been studied over an Ni/SiO2 catalyst prepared by homogeneous precipitation/deposition. The hydrogenations were carried out in the absence of diffusion limitations, catalyst deactivation or secondary conversions. Turnover frequencies and reaction probabilities decrease in the order benzene > toluene > o-xylene. The appearance of well defined reversible maxima (Tmax) in the rate vs. temperature plots is reported and discussed. The reaction orders with respect to the aromatic and hydrogen partial pressures are plotted as a function of temperature. The effect of temperature on the effective surface collisions is also considered. The temperature dependence of the rate constants was fitted to Arrhenius equations and generated positive (T ≤ Tmax) and negative (T ≤ Tmax) activation energies. The derivation of true activation energies and heats of adsorption from the kinetic data is presented. The turnover frequencies and apparent activation energies obtained in this study are compared to similar and different systems reported in the literature. A compensation effect is established for the experimentally determined or apparent kinetic parameters. The effect is attributed to variations in the temperature dependences of the surface concentration of the reactive aromatic species.
View MoreWuhan Sunrise Pharmaceutical Technology Co., Ltd
Contact:+86-27-83314682
Address:Room 340, New material Industrial base No.17, Gu Tian Five Lu , Qiaokou District, Wuhan , China
zhengzhou Triz Pharma-Tech Co., Ltd
website:http://www.Trizpharma-tech.com
Contact:+86-0371-86597269,53392065
Address:High-tech Industrial Development Zone, Zhengzhou City, NO.7 Holly Street
Ningbo Hi-tech Zone Nice-Synth Chemical Industry Ltd.
Contact:+86-(574)-81110986
Address:No. 1210, Building 3, Wante Business Centre, Hi-tech Zone, Ningbo
Zibo Ocean International Trade Co.,Ltd(expird)
Contact:+86 533 5160706
Address:1117, Hongtai Bld., Songling rd, Zichuan,Zibo,Shandong,China
Ji'an Kexin Trade Co., Ltd.(expird)
Contact:86-0796-8187704 18507063190
Address:ji'an jiangxi
Doi:10.1016/j.molstruc.2020.127713
(2020)Doi:10.1021/jo50002a014
(1951)Doi:10.1063/1.1670469
(1968)Doi:10.1016/j.jallcom.2009.09.104
(2010)Doi:10.1039/c2jm31390a
(2012)Doi:10.1016/j.ejmech.2021.113340
(2021)