层状Cu/SiO_(2)催化剂的制备及其草酸二甲酯加氢性能研究  

Selective hydrogenation of dimethyl oxalate over layered Cu/SiO_(2) catalysts

作　　者：王征 武朦朦 宋有为 赵金仙 任军[1,2] WANG Zheng;WU Meng-meng;SONG You-wei;ZHAO Jin-xian;REN Jun(State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Coal Science and Technology of the Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学省部共建煤基能源清洁高效利用国家重点实验室,山西太原030024 [2]太原理工大学煤科学与技术教育部重点实验室,山西太原030024

出　　处：《现代化工》2023年第3期157-162,170,共7页Modern Chemical Industry

基　　金：山西省应用基础研究计划(201901D211059)。

摘　　要：以层状硅酸铜为前驱体制备了不同焙烧温度下的层状Cu/SiO_(2)催化剂。利用N2吸脱附、XRD、FT-IR、SEM、TEM、XPS等手段对催化剂的结构性质进行表征。结果表明,500℃下焙烧得到的催化剂比表面积大、Cu物种分散度最高、Cu颗粒尺寸均一,前驱体中层状硅酸铜的质量分数最高,还原后Cu^(+)相对含量最高。将该催化剂应用于草酸二甲酯(DMO)选择性加氢制乙醇酸甲酯(MG),在2 MPa、200℃、H_(2)/DMO物质的量的比为100的反应条件下DMO的转化率为98.5%,MG的选择性为52.1%,并且层状Cu/SiO_(2)催化剂表现出良好的稳定性。Layered Cu/SiO_(2)catalysts are prepared at different calcination temperatures using copper phyllosilicate as precursor.The structural properties of the catalysts are characterized by means of N2adsorption and desorption, X-ray diffraction(XRD),fourier transform infrared spectroscopy(FT-IR),scanning electron microscope(SEM),transmission electron microscope(TEM) and X-ray photoelectron spectroscopy(XPS).The results show that the catalysts calcined at 500℃ have large specific surface area, the highest Cu species dispersion, uniform Cu particle size, and the highest content of copper phyllosilicate in the precursor, resulting in the highest content of Cu^(+)after reduction.The conversion of dimethyl oxalate is 98.5% and the selectivity of methyl glycolate is 52.1% when this catalyst is applied to the selective hydrogenation of dimethyl oxalate to methyl glycolate under the conditions of 2 MPa, 200℃ and H_(2)/DMO=100.The catalyst exhibits an excellent stability.

关 键 词：草酸二甲酯 层状硅酸铜 焙烧温度 选择性加氢 乙醇酸甲酯 层间限域效应 

分 类 号：TQ426[化学工程] O643[理学—物理化学]