酸碱性浸渍条件对钯炭催化剂加氢性能的影响  

Effect of acid/base impregnation conditions on hydrogenation performance of palladium carbon catalysts

作　　者：王柳枫 徐志超 李琪 王梁炳 WANG Liu-feng;XU Zhi-chao;LI Qi;WANG Liang-bing(Zhejiang NHU Company Ltd.,Shaoxin 312500,Zhejiang,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]浙江新和成股份有限公司,浙江绍兴312500 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《贵金属》2021年第2期56-61,共6页Precious Metals

基　　金：国家自然科学基金(51801235);湖南省自然科学基金(2018RS3019,2019JJ30033)。

摘　　要：采用氢氧化钠和盐酸调节钯炭(Pd/C)催化剂制备过程中的浸渍液的pH,制备了相应的钯炭催化剂。对Pd/C催化剂的成分、形貌等性质进行表征分析,研究了不同浸渍条件下制备的Pd/C催化剂对苯甲醛和2-氰基吡啶加氢的催化性能。结果表明,酸/碱浸渍方法可有效控制钯颗粒的尺寸大小及分散度。在浸渍液的pH值为3的条件下制备出的Pd/C-1^(#)催化剂平均粒径为2.78 nm。当浸渍液的pH值为10时,制备的Pd/C-2^(#)催化剂平均粒径为3.75 nm。对于2-氰基吡啶加氢,采用酸性浸渍条件制备的Pd/C催化剂具有更好的催化效果;而采用碱性浸渍条件制备的Pd/C-2^(#)催化剂对苯甲醛加氢效果更好。The pH of impregnation solutions was first adjusted by sodium hydroxide and hydrochloric solution,then prepared corresponding Pd/C catalysts.Their properties were characterized by XRD,BET and TEM.The hydrogenation performance of the Pd/C catalysts prepared under different immersion pH on benzaldehyde and 2-cyanopyridine was studied.The results showed that the acid/base impregnation condition could effectively control the size and dispersion of palladium particles.For the catalyst(Pd/C-1^(#))prepared by using a pH3 impregnation solution,its average Pd particle size was 2.78 nm,while for the Pd/C-2^(#)catalyst prepared by using a pH10 immersion solution,its average particle size was 3.75 nm.The Pd/C-1^(#)catalyst impregnated under acidic condition possesses a better conversion rate and selectivity in the hydrogenation of 2-cyanopyridine,while the Pd/C-2^(#)catalyst impregnated under alkaline condition has high conversion rate and selectivity for the hydrogenation of benzaldehyde.

关 键 词：钯炭催化剂 浸渍pH 加氢反应 苯甲醛 2-氰基吡啶 

分 类 号：TQ426.8[化学工程]