CAJ | 학술논문

以凹凸棒土（ APT）作载体，采用等体积浸渍法制备了Pd-Cu/APT催化剂，以CO氧化为探针反应，在连续流动微反装置上，考察了焙烧温度对催化剂CO常温催化氧化性能的影响。通过N2-物理吸附、XRD、TG、FT-IR和H2-TPR等手段对催化剂的结构和性质进行了表征。结果表明，随焙烧温度升高，Pd-Cu/APT中载体逐步脱水，进而引起催化剂结构和织构变化，其中，Cu物种由Cu（ OH） Cl逐渐向CuO转变，同时，高分散的Pd物种与Cu物种间相互作用先增强后减弱。经300℃焙烧的催化剂比表面积大，Cu物种以Cu（ OH） Cl形式存在，且具有良好的分散状态，与Pd物种之间产生较强的相互作用，显著提高了其还原性能。在空速6000 h-1、CO体积分数0．5％、水蒸气体积分数3．3％的反应条件下，常温可将CO完全转化800 min以上。焙烧温度高于或低于300℃均引起CO常温催化氧化性能的下降。
이요철봉토（ APT）작재체，채용등체적침지법제비료Pd-Cu/APT최화제，이CO양화위탐침반응，재련속류동미반장치상，고찰료배소온도대최화제CO상온최화양화성능적영향。통과N2-물리흡부、XRD、TG、FT-IR화H2-TPR등수단대최화제적결구화성질진행료표정。결과표명，수배소온도승고，Pd-Cu/APT중재체축보탈수，진이인기최화제결구화직구변화，기중，Cu물충유Cu（ OH） Cl축점향CuO전변，동시，고분산적Pd물충여Cu물충간상호작용선증강후감약。경300℃배소적최화제비표면적대，Cu물충이Cu（ OH） Cl형식존재，차구유량호적분산상태，여Pd물충지간산생교강적상호작용，현저제고료기환원성능。재공속6000 h-1、CO체적분수0．5％、수증기체적분수3．3％적반응조건하，상온가장CO완전전화800 min이상。배소온도고우혹저우300℃균인기CO상온최화양화성능적하강。
Using attapulgite clay ( APT ) as the support, the catalysts Pd-Cu/APT were prepared by wet impregnation method.The effect of calcination temperature on the catalytic performance of r CO oxidation at room temperature was investigated in a fixed-bed continuous flow reactor.Structure and property of th e catalysts were characterized by N2-physisorption, XRD, TG, FT-IR and H2-TPR.The results showed that as the calcination tem perature increased, structure and texture of the catalysts changed due to the desorption of water in the support.Cu species changed from Cu( OH) Cl to CuO gradually, while interactions between highly dispersed Pd and Cu species incrae sed firstly and then de creased.The catalyst calcined at 300 ℃ possessed the highest surface area, dispersed Cu ( OH ) Cl, and strong interaction between Pd and Cu species, which significantly improved the reducibility of the catalyst.At the reaction conditions of CO 0.5%, GHSV 6 000 h-1 , water content 3.3% and room temperature, the catalyst was able to maintain its activity for CO complete oxidation more than 800 min.Calcination temperatures higher or lower than 300℃caused the lower catalytic activity.