糠醛气相加氢制备糠醇Cu/SiO_(2)催化剂的失活机理研究  

Deactivation mechanism of Cu/SiO_(2)catalyst in gas phase hydrogenation of furfural to furfuryl alcohol

作　　者：于冬冬 于欣瑞 张雅静 王康军 YU Dong-dong;YU Xin-rui;ZHANG Ya-jing;WANG Kang-jun(College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学化学工程学院,辽宁沈阳110142

出　　处：《燃料化学学报（中英文）》2023年第12期1751-1760,共10页Journal of Fuel Chemistry and Technology

基　　金：辽宁省高等学校创新人才支持计划(辽教函[2020]389号);辽宁省兴辽英才计划(XLYC1907029);沈阳市中青年科技创新人才支持计划(RC210365)资助。

摘　　要：采用共沉淀法制备了Cu/SiO_(2)催化剂,在固定床反应器上评价其糠醛气相催化加氢制备糠醇的反应性能,并采用XRD、H2-TPR、ICP-OES、XPS、TG、Raman、TEM等手段对使用后的Cu/SiO_(2)催化剂进行表征,研究其在反应中的失活机理。在常压、反应温度140℃、质量空速2.4 h^(−1)、氢醛比9.7的条件下,反应5 h内糠醛转化率均高于97%;反应6−21 h,糠醛转化率从96%快速下降到32%,说明Cu/SiO_(2)催化剂在糠醛加氢反应中快速失活,失活的主要原因是活性组分铜的团聚烧结和催化剂表面上积炭覆盖了反应活性位。The Cu/SiO_(2)catalysts were prepared by co-precipitation and tested for hydrogenation of furfural to furfuryl alcohol in a fixed bed reactor.The deactivation mechanism of the catalysts was investigated by characterization of H2-TPR,ICP-OES,XPS,TG,Raman and TEM.Under the conditions of atmospheric pressure,reaction temperature of 140℃,mass space velocity of 2.4 h^(−1)and the molar ratio of hydrogen to furfural of 9.7,the furfural conversion was higher than 97%in the first 5 h.However,the conversion of furfural decreased rapidly from 96%to 32%after 21 h of reaction,indicating that Cu/SiO_(2)catalyst was rapidly deactivated.The factors for the deactivation of Cu/SiO_(2)catalyst were the agglomeration and sintering of the active component copper.Moreover,the carbon deposition on the catalyst surface resulted in the covered active site Cu0.

关 键 词：共沉淀法 Cu/SiO_(2)催化剂 糠醛加氢 失活机理 糠醇 

分 类 号：TQ426.8[化学工程]