MnO_(2)-CeO_(2)复合催化剂制备及室温下催化降解甲醛性能研究  

Preparation and room temperature catalytic HCHO oxidation performance of MnO_(2)-CeO_(2) composite catalyst

作　　者：张鹏[1] 牛惠翔 李茹[1] ZHANG Peng;NIU Hui-xiang;LI Ru(Department of Environmental Science and Engineering,Xi'an Polytechnic University,Xi'an 710600,China)

机构地区：[1]西安工程大学环境科学与工程系,陕西西安710600

出　　处：《化学工程师》2021年第11期1-4,共4页Chemical Engineer

基　　金：国家自然科学基金资助项目(11105102);西安工程大学研究生创新基金项目(chx2021022);陕西省科技统筹创新工程计划项目(2011KTCL01-12)。

摘　　要：本文采用络合法制备了MnO_(2)-CeO_(2)复合催化剂,用于室温下催化降解甲醛。通过正交实验确定了催化剂的最佳制备条件,通过连续催化降解甲醛实验考察了催化剂的催化稳定性。通过扫描电镜(SEM),X-射线能谱(EDS),X-射线衍射(XRD),N2吸附-脱附分析(BET)和氢气程序升温还原(H_(2)-TPR)对催化剂进行表征。结果表明,Mn/Ce摩尔比1∶1,水化热温度120℃,焙烧温度400℃,焙烧时间4h为催化剂的最佳制备条件,其中水化热温度为制备最关键的影响因素。MnO_(2)-CeO_(2)复合催化剂在室温下12h甲醛催化降解率为74.7%。连续催化降解甲醛实验中,降解率虽略有下降但仍在72%以上,催化剂的催化活性稳定。MnO_(2)-CeO_(2)复合催化剂是以MnO_(2)为主体的Mn-Ce-O混合氧化物,其表面形成以介孔为主的多孔表面,具有较大比表面积,在室温下对甲醛具有良好催化降解性能。In this paper,a complexation method was used to prepare a MnO_(2)-CeO_(2) composite catalyst for the catalytic degradation of formaldehyde at room temperature.The optimal preparation conditions of the catalyst were determined through orthogonal experiments,and the catalytic stability was investigated through continuous catalytic degradation experiments of formaldehyde.The catalyst was characterized by scanning electron microscopy(SEM),X-ray energy spectroscopy(EDS),X-ray diffraction(XRD),N2 adsorption-desorption analysis(BET)and hydrogen temperature programmed reduction(H_(2)-TPR).The results showed that optimal preparation conditions were that Mn/Ce was 1∶1,the temperature of hydration heat was 120℃,the calcination temperature was 400℃,and the calcination time was 4h.The catalytic degradation rate of formaldehyde in 12h at room temperature was 74.7%.In the continuous catalytic degradation experiment of formaldehyde,although the degradation rate decreased slightly,it was still above 72%,and the catalytic activity of the catalyst was stable.The MnO_(2)-CeO_(2) composite catalyst was a Mn-Ce-O mixed oxide with MnO_(2) as the main body.Its surface formed a porous surface dominated by mesopores,had a large specific surface area,and has good catalytic degradation performance for formaldehyde at room temperature.

关 键 词：MnO_(2)-CeO_(2)复合催化剂 比表面积 催化活性 室温甲醛降解 

分 类 号：TQ050.43[化学工程]