高比表面积高分散度铜基催化剂的制备及其性能  

Preparation and properties of copper-based catalysts with high specific surface area and high dispersion

作　　者：赵鹬[1] 侯振江 高姣姣 雷福红 雷前 李贵贤[1] ZHAO Yu;HOU Zhenjiang;GAO Jiaojiao;LEI Fuhong;LEI Qian;LI Guixian(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《精细化工》2022年第9期1866-1871,共6页Fine Chemicals

基　　金：国家自然科学基金(21763016)。

摘　　要：采用改进共沉淀法(通过精确控制pH=5合成出催化剂前体,再用正丁醇对前驱体预干燥处理)成功制备出高比表面积(383.87 m^(2)/g)、高分散度(42.74%)的Cu—O—Al骨架结构催化剂。结果表明,改进共沉淀法可有效增大催化剂比表面积和孔容,并使催化剂上铜物种的颗粒更小、分散度更高,进而表现出较高的催化活性。由于催化剂形成了Cu—O—Al骨架结构,可显著抑制铜物种的移动,从而提高其稳定性。以成本较低的空气作为氧源,在典型催化剂(CuAl_(3),Cu/Al标称物质的量比为0.3)上催化氧化1-甲氧基-2-丙醇(MOP)合成1-甲氧基-2-丙酮(MOA),在反应温度300℃、液时空速1.75 h^(-1)条件下,MOP转化率为85.2%,MOA选择性为55.7%,在液时空速为1.75~2.00 h^(-1)时MOP转化率和MOA选择性几乎不变。可稳定运行32 h,而该空速下传统浸渍法制备的催化剂(IM-CuAl)已基本无催化活性。Cu—O—Al framework catalyst with high specific surface area(383.87 m^(2)/g)and high dispersion(42.74%)was successfully prepared by improved coprecipitation method with the catalyst precursor synthesized at pH=5 precisely and pre-dried with n-butanol.The results showed that the synthesized catalyst exhibited higher catalytic activity because of the increased specific surface area,larger pore volume,smaller copper particle size and higher dispersion brought by the improved preparation method.The stability of the catalyst was further enhanced by the Cu—O—Al framework structure which significantly inhibited the migration of copper particles.The catalytic performance of the catalyst(CuAl_(3) with Cu/Al molar ratio of feeding of 0.3)in conversion of 1-methoxy-2-propanol(MOP)into 1-methoxy-2-acetone(MOA)led to a conversion rate of 85.2%and selectivity of 55.7%at 300℃ and liquid hourly space velocity of 1.75 h^(-1).which were almost unchanged in the range of 1.75~2.00 h^(-1),Moreover,the catalyst still kept its activity stably even after 32 h,while the catalyst prepared by traditional impregnation method(IM-CuAl)displayed no catalytic activity at this hourly space speed.

关 键 词：铜基催化剂 甲氧基丙酮 载体 分散度 比表面积 催化技术 

分 类 号：O643.36[理学—物理化学]