微通道反应器制备Cu-ZnO催化剂  

Preparation of Cu-ZnO Catalyst by Microchannel Reactor

作　　者：陈玉萍[1] 蒋新[1] 柳艳炉 卢建刚[2] 

机构地区：[1]浙江大学化学工程与生物工程学院,浙江杭州310027 [2]浙江大学控制科学与工程学院,工业控制技术国家重点实验室,浙江杭州310027

出　　处：《化学反应工程与工艺》2016年第3期193-197,共5页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金(21276223);国家高技术研究发展计划(863计划)(2010AA064905);浙江省重点科技创新团队计划(2009R50020)

摘　　要：为了考察共沉淀过程中的流动混合条件对催化剂结构性能的影响,分别采用微通道反应器和传统共沉淀法制备了铜锌催化剂,并用于催化合成气制甲醇反应。结果显示,微通道反应器制备的催化剂具有更好的催化活性。通过透射电镜(TEM)和低温N_2吸脱附(BET)表征及对反应过程的分析认为,微通道反应器中沉淀反应条件均匀、返混程度小,所得催化剂颗粒粒径小、分布均匀且比表面积大。X射线粉末衍射分析(XRD)和程序升温还原(H_2-TPR)的结果表明,微通道反应器制备的催化剂晶体生长得更好,还原后可得到更多的活性铜结构,这些特性使得催化剂在一氧化碳加氢合成甲醇反应上表现出更高的活性和甲醇选择性。The Cu-ZnO catalysts were prepared by both microchannel reactor and classical co-precipitation to investigate the impact of flow mixing pattern on the catalysts＇ structure and performance and used for methanol synthesis from syngas.It was found that the catalyst prepared by microchannel reactor showed a higher catalytic activity than whose prepared by classical co-precipitation.The transmission electron microscope and BET characterizations showed that the catalysts prepared by microchannel reactor had a narrower distribution,smaller particle size and larger specific surface area.Through the analysis of reaction process,we believe that is because the precipitation reaction condition is more homogeneous and it can avoid the possible backmixing in the microchannel reactor.The X-ray diffraction and H_2-temperature program reduction results indicated that the catalyst prepared by microchannel reactor had a higher degree of crystallization and more active Cu structures.All these properties made it possible to present a higher activity and methanol selectivity in the CO hydrogenation reaction.

关 键 词：微通道反应器 共沉淀法 甲醇 合成气 铜锌催化剂 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]