摘要
采用超声辅助的反相共沉淀法制备CO加氢合成低碳醇用CuCo基催化剂,研究过渡金属Zn、Mo助剂对CuCo基催化剂结构与性能的影响,借助N2吸附(BET)、X射线衍射(XRD)、程序升温还原(H2-TPR)和程序升温脱附(CO-TPD)等测试技术对催化剂进行表征.结果表明,Zn、Mo均在一定程度上增加了催化剂的比表面积、降低晶粒尺寸且保持Cu-Co尖晶石的主相结构.助剂Zn的添加对比表面积提高有限,降低了催化剂表面对CO物种的吸附量,CO转化率和醇产率有所减少;Mo助剂的存在显著提高了比表面积,促进了铜钴的分散,改善了氧化还原性能,使催化剂的加氢能力、CO转化率和醇产率均显著提高;Zn、Mo助剂的加入均促进了甲醇的形成.
CuCo-based catalysts for CO hydrogenation to higher alcohols were prepared by the ultrasound assisted reverse coprecipitation.Effects of transition elements（Zn,Mo） on the structure and catalytic performance were investigated.The catalysts were characterized by means of X-ray diffraction（XRD）,N2 adsorption isotherm（BET）,temperature-programmed reduction（H2-TPR） and temperature-programmed desorption（CO-TPD） techniques.The specific surface areas of the experimental catalysts were increased while the crystallite sizes were decreased by the addition Zn and Mo without changing the Cu-Co spinel crystal structure.For the Zn contained catalyst,the increase of specific surface area was limited and amount of adsorbed CO-species was decreased.Both CO conversion and alcohol yield were reduced.For the Mo promoted sample,the specific surface area was increased obviously.Meanwhile,the dispersion of copper and cobalt was promoted and the reducibility was improved.As a result,the hydrogenation ability,CO conversion and alcohol yield were increased significantly.With the addition of Zn and Mo,the contents of methanol in mixed alcohols were increased comparing with that of CuCo oxides.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2011年第4期316-321,共6页
Journal of Molecular Catalysis(China)
基金
陕西省教育厅自然科学专项(2010JK608)
西安工业大学科学研究基金(204-000092)项目资助
关键词
CuCo基催化剂
低碳醇
过渡金属
催化性能
CuCo-based catalysts
lower arbon alcohols
transition metal
catalytic properties
作者简介
士丽敏，女，生于1980年，博士，讲师，E-mail：lmshi@xatu．edu．cn．
