焙烧气氛对Pt/Al_(2)O_(3)催化氧化CO和C_(3)H_(6)性能的影响  

Effect of Calcination Atmospheres on Catalytic Performance of Pt/Al_(2)O_(3)for Oxidation of CO and C_(3)H_(6)

作　　者：郭淼鑫 王凤军 王成雄[1] 张爱敏[1] 赵云昆[1] 杜君臣 Guo Miaoxin;Wang Fengjun;Wang Chengxiong;Zhang Aimin;Zhao Yunkun;Du Junchen(State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Kunming Institute of Precious Metals,Kunming 650106,China)

机构地区：[1]昆明贵金属研究所稀贵金属综合利用新技术国家重点实验室,云南昆明650106

出　　处：《稀有金属材料与工程》2021年第9期3056-3061,共6页Rare Metal Materials and Engineering

基　　金：National Key Research and Development Program of China (2016YFC0204902);Open Fund of National Engineering Laboratory for Mobile Source Emission Control Technology of China (NELMS2017C02);Analysis and Testing Foundation of Kunming University of Science and Technology (2019P20181107010)

摘　　要：使用Pt(NH_(3))2(NO_(2))2作为前驱体,通过过量浸渍法制备Pt/Al_(2)O_(3)催化剂,并将其在4种不同的气氛(H_(2)、O_(2)、NO或NH_(3))中进行焙烧。利用N_(2)吸脱附、X射线衍射、程序升温还原(H_(2)-TPR)、CO脉冲吸附、CO原位漫反射傅里叶变换红外光谱(CO in situ DRIFTS)等手段对催化剂的物化性质进行了表征。结果表明:由于还原性焙烧气氛导致了众多小尺寸和高分散的Pt纳米颗粒的生成,经1%(体积分数)H_(2)/N_(2)焙烧的Pt/Al_(2)O_(3)表现出最佳的CO和C_(3)H_(6)催化氧化性能。Pt/Al_(2)O_(3)catalysts were prepared by an excess impregnation method with Pt(NH_(3))2(NO_(2))2 as the precursor.Then they were calcined in four different atmospheres(H_(2),O_(2),NO,NH_(3)),and characterized by N_(2)adsorption and desorption test,X-ray diffraction,H_(2)-temperature programmed reduction(TPR)test,CO pulse adsorption test,and CO in-situ diffuse reflectance infrared Fourier transform spectroscopy(CO in situ DRIFTS).Results show that Pt/Al_(2)O_(3)catalyst calcined in 1vol%H_(2)/N_(2)atmosphere exhibits the best catalytic oxidation performance for CO and C_(3)H_(6),because of the generation of numerous small-sized and highly dispersed Pt nanoparticles caused by the reducing calcination atmosphere.

关 键 词：Pt基催化剂 焙烧气氛 尺寸效应 尾气净化 

分 类 号：TQ426[化学工程]