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Ru₁La_xO_δ/γ-Al₂O₃催化剂上CO选择性氧化去除性能及焙烧温度的影响

Study on selective CO oxidation in hydrogen-rich gas and effect of calcined temperature on Ru₁La_xO_δ/γ-Al₂O₃ catalysts

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【Author】 CHEN Xi-rong1, DONG Xin-fa1, ZOU Han-bo2, CHEN Sheng-zhou2, LIN Wei-ming1,2(1.School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510641, China; 2.School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510091, China)

【机构】华南理工大学化工与能源学院；广州大学化学与化工学院；华南理工大学化工与能源学院广东广州510641；广东广州510641；广东广州510091；广东广州510641广州大学化学与化工学院；

【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Ru1La10Oδ/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。更多还原

【Abstract】 Ru₁La_xO_δ/γ-Al₂O₃ catalysts modified with La₂O₃ are prepared via incipient co-impregnation 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 Ru₁La_xO_δ/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 La₂O₃ is added to Ru/γ-Al₂O₃;La₂O₃ 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.更多还原