摘要
用漫反射傅立叶变换红外光谱法(DRIFTS)研究了VPO催化剂上C4烃正丁烷、1-丁烯和1,3-丁二烯选择氧化制顺酐的表面吸附及反应过程.VPO催化剂暴露在流动混合气组成为1.5%C4+21%O2+N2,流量为50mL/min的在高温高压池中,温度(100～400)℃.结果表明C4烃在催化剂表面吸附很弱,在三种C4烃的选择氧化反应中,均发现了吸附的顺酐和COX和H2O,气相中的C4烃与催化剂上的氧按Rideal机理进行选择氧化反应;检测到吸附的顺丁烯二酸和高活性的烯烃物种进一步证实了烯烃和马来酸是正丁烷选择氧化的中间物种.
The adsorption and selective oxidation reaction of C4 hydrocarbon (%n%-butane, 1-butene and 1,3-butadiene) to Maleic Anhydride on a commercial VPO catalyst have been investigated by in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) with High Temperature/High Pressure chamber (HTHP) under steady-state conditions. The Catalyst was exposed to the flow of 50 mL/min of 1.5 moL% C4 in air mixture at different temperatures ranged from 50 to 400 ℃ in the HTHP chamber. Spectroscopic investigations show that the adsorption of C4 hydrocarbon on the VPO catalyst surface is very weak; Selective oxidation products (MA) and combustion products (CO, CO-2 and H-2O) could be confirmed on the catalyst surfaces. C4 hydrocarbon reacts with oxygen on the surface of the VPO catalyst according to Rideal mechanism. Adsorbed Maleic acid and activated olefin were detected as surface intermediates; this suggests that olefins and maleic acid could be intermediates in paraffin selective oxidation.
出处
《华北工学院学报》
2004年第2期113-116,共4页
Journal of North China Institute of Technology
基金
国家自然科学基金
中国石油化工集团公司联合资助重大项目子课题
