载体焙烧温度对Pt/FeO_(x)催化剂的CO催化氧化及其抗H_(2)O和CO_(2)的影响  

Effect support calcination temperature on CO oxidation over Pt/FeO_(x) catalysts and their resistance to H_(2)O and CO_(2)

作　　者：朱梦婷 邢金媛 李艳明 罗孟飞[1] 鲁继青[1] ZHU Mengting;XING Jinyuan;LI Yanming;LUO Mengfei;LU Jiqing(College of Chemistry and Life Sciences,Zhejiang Normal University,Jinhua 321004,China;Library of Zhejiang Normal University,Jinhua 321004,China)

机构地区：[1]浙江师范大学化学与生命科学学院,浙江金华321004 [2]浙江师范大学图文信息中心,浙江金华321004

出　　处：《浙江师范大学学报（自然科学版）》2021年第2期171-179,共9页Journal of Zhejiang Normal University:Natural Sciences

基　　金：国家自然科学基金资助项目(21773212;21643007)。

摘　　要：以不同焙烧温度的FeO_(x)为载体制备了负载型Pt催化剂,考察了其在不同反应条件下的CO催化氧化性能及其抗H_(2)O和抗CO_(2)性能.结果表明:在CO+O_(2)条件下,Pt/FeO_(x)-300催化剂(载体经300℃焙烧)性能最好,可能与催化剂中最高的Pt物种分散度有关;而Pt/FeO_(x)-400催化剂中尽管Pt分散度较低,但其γ-Fe_(2)O_(3)晶相的存在使催化剂具有更强的还原能力,从而也保持了较高活性.在反应气氛中加入H_(2)O能有效促进催化剂活性和稳定性;反应动力学显示,H_(2)O的加入可能在催化剂表面形成大量羟基,而CO与表面羟基之间的快速反应开辟了新的反应路径,从而提高了反应活性.研究对理解不同晶相的FeO_(x)在H_(2)O和CO_(2)存在条件下的反应行为提供了实验证据.The supported Pt catalysts on FeO_(x) oxides calcined at different temperatures were prepared and tested for CO oxidation under different reaction conditions to investigate their performance and the resistance to H 2O and CO_(2).It was found that under CO+O_(2) condition,the Pt/FeO_(x)-300 catalyst(the FeO x was calcined at 300℃)showed the best activity due to its highest Pt dispersio;However,despite the low Pt dispersion in the Pt/FeO_(x)-400 catalyst,the presence ofγ-Fe_(2)O_(3) in the catalyst resulted in very high reducibility,which was responsible for the improved activity.Also,the addition of H_(2)O in the feed gas could effectively improve the activity and stability of the catalysts.The kinetics on the catalysts revealed that the addition of H_(2)O led to the formation of surface hydroxyl group which could readily react with CO.This new reaction route was responsible[HJ*2/5]for the enhanced activity by H_(2)O addition.The experimental evidence for understanding the reaction behavior of FeO_(x) was provided with different crystalline phases in the presence of H_(2)O and CO_(2).

关 键 词：CO氧化 FeO_(x)载体 PT催化剂 抗水性 反应机理 

分 类 号：O643.32[理学—物理化学]