纳米形貌对Ce-V催化剂降解氯苯活性影响  

Effect of nanostructure on catalytic degradation of chlorobenzene over Ce-V catalysts

作　　者：施琦 丁龙 龙红明 王毅璠[1] 春铁军 SHI Qi;DING Long;LONG Hong-ming;WANG Yi-fan;CHUN Tie-jun(School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering&Resources Recycling,Maanshan 243002,Anhui,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243032 [2]安徽工业大学冶金工程与资源综合利用安徽省重点实验室,安徽马鞍山243002

出　　处：《材料工程》2021年第8期162-168,共7页Journal of Materials Engineering

基　　金：国家自然科学基金面上项目(51674002);国家自然科学基金重点资助项目(U1660206)。

摘　　要：利用水热合成法制备了Ce-V催化剂,研究了纳米形貌对Ce-V催化剂降解氯苯活性的影响。通过NaOH/氨水调节溶液化学环境、添加表面修饰剂P123,对Ce-V催化剂晶粒生长方向进行调控,分别获得纳米立方状(CV-1)、纳米颗粒状(CV-2)和纳米棒状(CV-3)形貌的催化剂。对比不同纳米形貌催化剂降解氯苯活性差异,并利用XRD,BET和TEM对Ce-V催化剂理化特性进行了表征。结果表明:三种Ce-V催化剂纳米颗粒大小顺序为CV-1>CV-2>CV-3,降解活性顺序为CV-3>CV-2>CV-1。其中,氨水调节后的CV-2和CV-3催化剂中形成了CeVO 4新相,缓解了VO x在催化剂表面团聚,有效提升了催化剂氯苯降解活性。Ce-V催化剂动力学计算结果说明,CV-3的表观活化能最高,为(9.26±3.76)kJ·mol^(-1),与实测结果一致。Ce-V catalysts were synthesized by a hydrothermal method.In order to change the chemical environment of solution during the preparation process,NaOH solution and ammonia were used to adjust the pH value,and surfactant P123 was added to limit the grain growth direction of Ce-V catalysts.And then different Ce-V catalysts with nano-cubic(CV-1),nano-particles(CV-2)and nano-robs(CV-3)were obtained,respectively.The chlorobenzene conversion of Ce-V catalysts with different nano-structure were investigated.The Ce-V catalysts were characterized by XRD,BET and TEM,and the controlling mechanism of nano-structure on the catalytic activity was analysed.The results show that the particles size order of Ce-V catalysts is CV-1>CV-2>CV-3,and the catalytic activity order of Ce-V catalysts is CV-3>CV-2>CV-1.New phase CeVO 4 forms in CV-2 and CV-3 catalysts,which weakens the agglomeration of VO x on the catalyst surface and promotes catalytic activity.The kinetics calculation results of Ce-V catalysts show that the apparent activation energy of CV-3 is the highest,which is 9.26±3.76 kJ·mol^(-1).It is consistent with the catalytic activity test.

关 键 词：纳米形貌 催化降解 Ce-V催化剂 氯苯 水热法 

分 类 号：TB383[一般工业技术—材料科学与工程]