摘要
通过共沉淀法和浸渍法制备负载微量Pd的Pd/Cu/ZnO(n(Cu)/n(Zn)=1/1.4)催化剂,采用H2程序升温还原(H2-TPR)、N2O吸附和H2吸附等方法对催化剂进行表征,在连续流动固定床反应器中考察Pd/Cu/ZnO催化甘油氢解的反应性能.结果表明:引入微量Pd降低了催化剂的还原温度,增强了催化剂氢吸附性能,但对催化剂活性Cu表面积的影响较小,有效地提高了催化剂上甘油氢解反应的稳定性.从Pd表面溢流到Cu表面的活化氢原子降低了H2O对催化剂活性Cu的氧化.
Trace amounts of the palladium were supported on Cu/ZnO（n（Cu）/n（Zn）=1/1.4） by impregnation methods.Binary Cu/ZnO（n（Cu）/n（Zn）=1/1.4） catalyst was prepared by co-precipitation from metal nitrates.The physic-chemical properties were characterized by temperature programmed hydrogen reduction（H2-TPR）,N2O chemisorption and H2 chemisorption.Their catalytic performance for glycerol hydrogenolysis to 1,2-propanediol was studied in a fixed-bed continuous flow reactor.Results showed that the addition of trace amounts of the palladium enhanced both reducibility and H2 uptakes of the catalysts,with little effect on active Cu metal surface area of the catalysts.A small amount of Pd was effective for improving the sustainability of the catalyst for glycerol hydrogenolysis to 1,2-propanediol.The spillover of activated hydrogen from trace Pd metal to active Cu metal stabilized the active Cu metal species against water oxidative deactivation during the reaction.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2010年第6期36-40,共5页
Journal of Nanjing Tech University(Natural Science Edition)
基金
教育部博士点基金资助项目(20070291007)
江苏省自然科学基金资助项目(BK2008375)
