摘要
采用共浸渍法制备了一系列Ru1LaxOδ／γ-Al2O3复合氧化物催化剂，考察了La2O3的加入量、焙烧温度对CO选择性氧化反应性能的影响。添加La2O3的Ru1LaxOδ／γ-Al2O3催化剂在110～170℃时能达到99％以上的CO转化率，选择性相对较高；镧的加入提高了催化剂的热稳定性。在500℃以前焙烧钌的晶粒大小变化不大，但是焙烧温度达到了600℃后，晶粒明显长大，催化剂活性也随之下降。
Ru1LaxOδ/γ-Al2O3 catalysts modified with La2O3 are prepared via incipient co-impregnatlon method, and the preferential oxidation of CO in the hydrogen-rich gas has been examined over the catalysts. The effects of La2O3 loading and different calcined temperatures on the structure and performance of Ru1LaxOδ/γ-Al2O3 are studied. Results show that higher CO conversion （〉99% ） and selectivity in wider temperature range（ 110- 170℃ ）can be obtained after the appropriate quantity of La203 is added to Ru1LaxOδ/γ-Al2O3 can improve the thermal stability of the catalysts. No obvious change is found in particle＇s size after the catalysts are calcined below 500℃, but after cancined at 600℃, the catalysts＇ pore size will increase with activity falling down.
出处
《现代化工》
EI
CAS
CSCD
北大核心
2008年第3期40-43,共4页
Modern Chemical Industry
基金
国家自然科学基金(20576023)
广东省自然科学基金(06025660)资助项目
关键词
Ru催化剂
CO选择性氧化La2O3
焙烧温度
ruthenium catalysts
selective CO oxidation
lanthanum oxide
calcined temperature
