微反应器共沉淀反应制备铜锰催化剂  

Advantage of microreactor on the synthesis of high-activity Cu-Mn catalyst by co-precipitation

作　　者：付家崴 陈帅帅[1] 方凯伦 蒋新[1] FU Jiawei;CHEN Shuaishuai;FANG Kailun;JIANG Xin(Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China)

机构地区：[1]浙江大学化学工程与生物工程学院,浙江省化工高效制造技术重点实验室,浙江杭州310027

出　　处：《化工学报》2023年第2期776-783,共8页CIESC Journal

基　　金：国家自然科学基金项目(21676236);国家重点研发计划项目(2017YFC0211802)。

摘　　要：在Caterpillar微反应器中采用共沉淀法制备了不同铜锰比的共沉淀物,直接焙烧得到铜锰复合氧化物催化剂。采用X射线衍射(XRD)、热重分析(TG)、拉曼光谱(Raman)和X射线光电子能谱(XPS)对沉淀物和催化剂进行了物相和结构分析。结果显示,随着Cu含量的增加,催化剂中Mn3+所占比例逐渐下降,表面晶格氧含量呈现先上升后下降的趋势,催化甲苯降解的活性呈现先上升后下降的规律。微反应器中的流动反应特性使得催化剂中的Cu、Mn保持良好分散性,有利于提高催化剂中Mn3+含量,此时表面晶格氧成为催化活性的制约因素。Cu-Mn coprecipitates with different copper manganese molar ratios were synthesised by co-precipitation method in the Caterpillar microreactor,and Cu-Mn composite oxide catalysts were prepared after calcining.The phase and structure of the precipitates and catalysts were analyzed by X-ray diffraction(XRD),thermogravimetric analysis(TG),Raman spectroscopy(Raman spectrum)and X-ray photoelectron spectroscopy(XPS).The results show that with the content of Cu increasing,the proportion of Mn3+in the catalyst decreased gradually,the content of the surface lattice oxygen increased first and then decreased,and the catalytic performance of oxidation of toluene increased first and then decreased.The flow reaction characteristics of microreactor make Cu and Mn element in the catalyst maintain good dispersion,which contributes to increasing the content of Mn3+in the catalyst.On the basis of high Mn3+catalyst,the surface lattice oxygen becomes the dominating factor of catalytic performance.

关 键 词：微反应器 沉淀 铜锰配比 铜锰复合氧化物 催化剂 

分 类 号：TQ426.6[化学工程]