浸渍法制备MgO/ZrO_(2)催化氧化NO  

Catalytic oxidation of NO by MgO/ZrO_(2) prepared by impregnation method

作　　者：田文珊 龚宥精 李秋瑾 段开娇 贾丽娟 常玉 刘天成 TIAN Wenshan;GONG Youjing;LI Qiujin;DUAN Kaijiao;JIA Lijuan;CHANG Yu;LIU Tiancheng(Key Laboratory of Resource Clean Conversion in Ethnic Regions,Education Department of Yunnan,College of Chemistry and Environment,Yunnan Minzu University,Kunming 650504,Yunnan,China;Department of Chemistry and Pharmacy,Yunnan Technician College,Kunming 650399,Yunnan,China)

机构地区：[1]云南民族大学化学与环境学院,云南省高校民族地区资源清洁转化重点实验室,云南昆明650504 [2]云南技师学院化学与制药系,云南昆明650399

出　　处：《云南大学学报（自然科学版）》2024年第4期727-734,共8页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金(51568068);云南省中青年学术和技术带头人后备人才项目(202105AC160054).

摘　　要：采用浸渍法制备MgO/ZrO_(2)催化剂.通过XRD、SEM、N_(2)-吸附/脱附等表征结合催化剂活性测试,研究了催化剂焙烧温度(200~800℃)对催化氧化NO的影响.进一步探究O_(2)含量、催化剂粒径对NO的转化率的影响.结合FTIR表征对最佳实验条件下反应前后的催化剂进行分析.结果表明,不同焙烧温度下的MgO/ZrO_(2)只显示出ZrO_(2)的特征峰,催化剂焙烧温度≤300℃时,MgO/ZrO_(2)催化剂为不定型,随着焙烧温度的升高氧化锆逐渐由无定型向四方相氧化锆转化.催化剂活性测试结果显示:800℃焙烧的催化剂更有利于催化氧化NO.MgO/ZrO_(2)催化氧化NO的效率与比表面积无相关性,而与催化剂堆积形成的狭缝孔有关.当O_(2)体积分数为5%,催化剂粒径为0.894 mm(20目),NO转化率随着反应温度的升高而增大;当反应温度为300℃时NO转化率达到最佳,为96%.The MgO/ZrO_(2) catalysts were prepared by impregnation method.The effect of catalysts calcination temperature on the catalytic oxidation of NO was investigated by the characterize of XRD,SEM and N2 adsorption/desorption and catalyst activity test.The effects of O_(2) content and catalyst particle size on the conversion of NO were further investigated.The catalysts before and after the reaction under the optimal experimental conditions were analyzed in combination with FTIR characterization.The results indicated that the MgO/ZrO_(2) catalyst only shows the characteristic peak of ZrO_(2) at different calcination temperatures;When the calcination temperature was≤300℃,MgO/ZrO_(2) catalyst was amorphous.Nevertheless,with the increase of calcination temperature,zirconia in the catalyst gradually transforms from amorphous to tetragonal zirconia.The results of catalyst activity test showed that the catalyst calcined at 800℃was more favorable for the catalytic oxidation of NO.The catalytic efficiency of MgO/ZrO_(2) for NO oxidation was not related to the specific surface area,but related to the slit formed by catalyst accumulation.When the O_(2) content was 5%,the catalyst particle size was 20 mesh,the conversion rate of NO increased with the increase of reaction temperature;The best NO conversion of 96% was achieved when the reaction temperature was 300℃.

关 键 词：浸渍法 MgO/ZrO_(2) 催化氧化 NO 

分 类 号：X511[环境科学与工程—环境工程]