首页|Selective hydrogenation of dimethyl toluene-2,4-dicarbamate over supported Rh-based catalysts:Effect of support properties

Selective hydrogenation of dimethyl toluene-2,4-dicarbamate over supported Rh-based catalysts:Effect of support properties

扫码查看
原文链接
  • 万方数据
  • 维普
Selective hydrogenation of dimethyl toluene-2,4-dicarbamate over supported Rh-based catalysts:Effect of support properties
The selective hydrogenation of dimethyl toluene-2,4-dicarbamate(TDC)to methyl cyclohexyl-2,4-dicarbamate(also called hydrogenated TDC,HTDC)is an essential process for non-phosgene synthesis of methylcyclohexane-2,4-diisocyanate.Herein,we prepared a series of supported Rh-based catalysts by the excessive impregnation method and investigated their catalytic performance for the selective hy-drogenation of TDC.The emphasis was put on the influence of support properties on the catalytic per-formance.Among the prepared catalysts,Rh/γ-Al2O3 performed the best:a HTDC yield of 88.4％was achieved with a 100％conversion of TDC under the conditions of 100 ℃,3 MPa and 1 h.Furthermore,Rh/γ-Al2O3 could be repetitively used for 4 times without a significant loss of its catalytic activity.TEM,XRD,N2 adsorption-desorption,H2-TPR,NH3/CO2-TPD,XPS and ICP characterizations were employed to distinguish the properties of the prepared catalysts and the results were correlated with their catalytic performance.It is indicated that the yield of HTDC shows a positive relevance with the percentage of moderate-to-strong acid sites and the content of Rhn+(n ≥ 3)in the catalysts.High values of the per-centage and the content can promote a strong interaction between Rh nanoparticles and the supports,facilitating both the transfer of electrons from Rh to the support and the formation of Rhn+species.This is conducive to activating the benzene ring of TDC and thereby improving the yield of HTDC.

Dimethyl toluene-2,4-dicarbamateMethyl cyclohexyl-2,4-dicarbamateBenzene ring hydrogenationSupported Rh-based catalystsSupport properties

Yaqi Qu、Xiang Li、Hualiang An、Xinqiang Zhao、Yanji Wang

展开 >

Hebei Provincial Key Laboratory of Green Chemical Technology and Efficient Energy Saving,Tianjin Key Laboratory of Chemical Process Safety,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China

Dimethyl toluene-2,4-dicarbamate Methyl cyclohexyl-2,4-dicarbamate Benzene ring hydrogenation Supported Rh-based catalysts Support properties

2024

10.1016/j.cjche.2024.07.014

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.75(11)