摘要
采用混合法制备La0.8K0.2Mn0.95Cu0.05O3/γ-Al2O3担载型钙钛矿型催化剂,担载前载体于0.5 mol/L的H2SO4溶液中进行浸渍改性。运用程序升温氧化对各担载型催化剂进行活性评价,考察载体改性时间对催化剂活性的影响。采用XRD和FTIR对催化剂进行了表征,结果显示,改性后的担载型催化剂能够保持良好的钙钛矿结构;与6 h和24 h的相比较,发现载体γ-Al2O3经过12 h浸渍改性后,混合法制备的担载量为20%的担载型催化剂表现出较好的催化活性,将碳烟的起燃温度降至389℃,该温度在柴油车排气温度范围内。
Citric acid complex method has been used to synthesize La0 8K0.2Mn0.95Cu0.0503 perovskite-type oxide catalyst. γ-Al2O3 support was modified by impregnating in 0.5 mol/L H2SO4 solution. The effect of modification time of support on catalyst active was investigated. The catalytic activity of these supported catalysts was evaluated by TPO （ temperature-programmed oxidation） to reveal influences of modification time to supported catalysts La0.8K0.2Mn0.95Cu0.0503/γ-Al2O3 catalytic combustion for soot. Catalysts had been characterized by XRD and FTIR. The results showed that the supported catalysts prepared by hybrid method maintained good structure of perovskite-type. After support γ-Al2O3 had been treated by impregnating in H2SO4 for 12 h ,supported catalyst prepared by hybrid method exhibited better catalytic activity to compare with 6 h and 24 h. The ignition temperature of soot has been decreased down to 389 ℃. While the temperature interval of smoke exhausted from vehicle with diesel engine is 175 -400 ℃.
出处
《应用化工》
CAS
CSCD
2009年第7期954-957,961,共5页
Applied Chemical Industry
基金
广东省自然科学基金(8151009101000025)
污染控制与生态修复广东省普通高等学校重点实验室开放基金资助
广东省社会发展科技项目(2007B030102006)
广州市属高校科技项目(62008)
关键词
钙钛矿型催化剂
载体γ—Al2O3
改性
柴油车
perovskite-type oxide catalyst
support γ-Al2O3
modification
vehicle with diesel engine
