摘要
采用离子交换法制备了Cu/SSZ-39催化剂。随后,对催化剂进行不同温度下的水热处理。采用XRF、XRD、SEM、N_(2)-吸附脱附、H_(2)-TPR、XPS和NH_(3)-TPD表征,分析了催化剂的成分、结构、形貌等性质。随后,在固定床微型反应评价装置上测试了催化剂的脱硝活性。结果显示,水热处理对Cu/SSZ-39催化剂的成分、晶型、形貌和孔结构影响较小,但会导致催化剂上Cu物种的结构和催化剂的酸性改变。650℃水热处理后,催化剂上部分Cu(OH)^(+)-Z物种转变成了CuO_(x)物种和Cu^(2+)-2Z物种。进一步提升水热处理温度至750℃,催化剂上更多CuO_(x)物种生成,同时催化剂的酸性下降。因此,经650℃水热处理后,催化剂的脱硝活性略低于新鲜催化剂,而在750℃下水热处理后的催化剂却显示了最低的脱硝活性。
Cu/SSZ-39 catalyst was prepared by ion-exchange method.Then the catalyst was hydrothermal treated at different temperatures.XRF,XRD,SEM,N_(2)-adsorption,H_(2)-TPR,XPS,and NH_(3)-TPD were carried out to characterize the physiochemical properties of the catalysts.The catalytic performances of the catalysts were tested via a fixed-bed micro-reactor.The results showed that the hydrothermal treatment had little impact on the composition,crystal structure,morphology,and pore structure of the catalyst.However,the hydrothermal treatment would lead to the alteration of Cu species and the acidity of the catalyst.A part of the Cu(OH)^(+)-Z species would transform to CuO_(x) and Cu^(2+)-2Z species,after hydrothermal treatment at 650℃.More CuO_(x) species would be generated when the hydrothermal treatment temperature was increased to 750℃.Meanwhile,the acidity of the catalyst also decreased.As a result,the catalytic activity of the catalyst hydrothermally treated at 650℃was slightly lower than that of fresh sample,while the catalyst hydrothermally treated at 750℃exhibited the poorest catalytic performance among the three catalysts.
作者
岳彦伟
黄力
王素芹
李金珂
王虎
YUE Yan-wei;HUANG Li;WANG Su-qin;LI Jin-ke;WANG Hu(Datang Nanjing Environmental Protection Technology Co.,Ltd.,Nanjing 211111,China;Jiangsu JITRI-Tops e Institute of Advanced Catalytic Technology,Suzhou 215132,China;Jiangsu JITRI-Tops e Clean Energy R&D Co.,Ltd.,Suzhou 215132,China)
出处
《化学试剂》
CAS
北大核心
2023年第11期98-103,共6页
Chemical Reagents
基金
江苏省自然科学基金项目(BK20210001)。
