摘要
在常温常压下利用简易的液相还原法合成了高效催化剂Ni-Ce O_2,该催化剂晶体粒径为21.8 nm,颗粒之间部分粘连,呈絮状分散.相对于纯镍催化剂,氧化铈的加入阻止了镍纳米颗粒的大规模团聚,没有表面活性剂的掩蔽作用,使其暴露出大量的活性位点.考察了镍/氧化铈的比例对催化剂活性的影响,当镍与氧化铈的摩尔比为9∶1时催化剂活性最高;考察了反应体系中的氢氧化钠浓度对催化效果的影响,当氢氧化钠浓度大于等于0.7 mol/L时,该催化剂在70℃下催化降解水合肼时表现出100%的氢气选择性和50.0 h^-1的转化频率;在30℃下,依然表现出高达91%的氢气选择性和6.1 h^-1的转化频率.
A highly efficient catalyst Ni-CeO2 is synthesised at room temperature and atmospheric pressure using a simple liquid phase reduction method, the crystal grain size of the catalyst is 21.8 nm, which is a flocculent dispersion in the suspension. Compared with the pure nickel catalyst, the added cerium oxide prevented the agglomeration of nickel nanoparticles, no masking effect of the surfactant leads to a large number of active sites exposed. The influence of the ratio of Ni/CeO2 on catalytic activity was investigated, the catalyst has the highest catalytic activity when the molar ratio of nickel and cerium oxide is 9∶1;The influence of the concentration of sodium hydroxide on the catalytic effect in the reaction system was studied, when the concentration of hydrogen sodium is greater than or equal to 0.7 mol/L, the catalyst exhibits catalytic degradation of hydrazine hydrate at 100% of the hydrogen selectivity and 50.0 h-1 of turnover frequency at 70℃; At 30℃, the catalyst still exhibits up to 91%of hydrogen selectivity and 6.1 h-1 of turnover frequency.
出处
《天津工业大学学报》
CAS
北大核心
2016年第2期45-51,共7页
Journal of Tiangong University
基金
国家自然科学基金资助项目(51508384
41373114
51308390)
关键词
镍
氧化铈
催化剂
水合肼
储氢材料
nickel
cerium oxide
catalyst
hydrazine hydrate
hydrogen storage material
作者简介
马敬环（1964-）,女,博士,教授,博士生导师,主要研究方为海水淡化及海水综合利用技术及工业污水废水回用技术.E-mail：13920893096@163.com
