负载型贵金属催化剂的臭氧分解性能  

Study on catalytic performance of supported noble metal catalyst for ozone decomposition

作　　者：王婷 王胜[1] 符启军 邢德风 王树东[1] Wang Ting;Wang Sheng;Fu Qijun;Xing Defeng;Wang Shudong(Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]洁净能源国家实验室,中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《工业催化》2022年第1期30-38,共9页Industrial Catalysis

基　　金：国家自然科学基金(U20A20132)资助项目;大连化学物理研究所基金项目(DICP I202146);中国科学院DNL合作基金项目(DNL202004)。

摘　　要：通过浸渍法和乙二醇还原法制得γ-Al_(2)O_(3)负载钯催化剂,在30℃、600000 mL·(gcat·h)^(-1)和不同相对湿度(RH<5%和RH>90%)条件下,研究其臭氧催化分解性能。结果表明,Pd负载质量分数1.5%和贵金属粒径约2.8 nm的Pd/γ-Al_(2)O_(3)催化剂催化活性最佳。采用XRD、XPS、TEM、SEM-EDS、O_(2)-TPD和H_(2)O-TPD等手段,揭示其优良臭氧分解性能可能是由于较小的Pd粒径改善了催化剂中Pd^(0)相对含量和氧物种迁移能力。此外,Pd催化剂对于水的吸附量和吸附强度的调变,改善了其耐水性能,这些研究为高效Pd基臭氧分解催化剂开发提供了指导。In this paper,γ-Al_(2)O_(3) supported palladium catalysts were prepared by impregnation method and ethylene glycol reduction method.Their ozone catalytic decomposition performance was studied at 30℃under WHSV of 600000 mL·(gcat·h)^(-1) and different relative humidity(RH<5%and RH>90%).The results showed that 1.5wt%Pd/γ-Al_(2)O_(3) catalyst with 2.8 nm average particle size has superior catalytic activity.According to the characterization by XRD,XPS,TEM,SEM-EDS,O_(2)-TPD and H_(2)O-TPD,it was revealed that their excellent ozone decomposition ability was attributed to its smaller Pd particle size,higher content of Pd^(0) and oxygen mobility.In addition,the enhancement of water resistance over Pd-based catalyst was owing to the modification of H_(2)O adsorption capacity and adsorption strength.The relevant study provided the guideline for the development of efficient Pd-based ozone decomposition catalysts.

关 键 词：催化化学 臭氧 催化分解 贵金属 耐水性 

分 类 号：O643.36[理学—物理化学] TQ426.6[理学—化学]