| SO2对La0.8K0.2Cu0.05Mn0.95O3钙钛矿催化剂氧化碳烟的影响 |
| Effect of SO2 on Soot Oxidation over La0.8K0.2Cu0.05Mn0.95O3 Perovskites-type Catalyst |
|
| 摘要: 采用柠檬酸配位法制备K、Cu掺杂的La0.8K0.2Cu0.05Mn0.95O3钙钛矿催化剂，运用程序升温氧化(TPO)考察在不同浓度SO2气氛下La0.8K0.2Cu0.05Mn0.95O3催化剂催化氧化模拟碳黑的性能，并用XRD、FTIR和XPS等进行表征。结果表明，催化剂在0~0.1%的SO2气氛中呈现出不同活性，φSO2≤0.05%的气氛可促进催化剂催化氧化碳黑的活性，当φSO2=0.03%时，催化剂活性最高；引入φSO2≥0.06%时催化剂活性明显下降。XPS说明表面活性氧的增加是低浓度的SO2促进催化活性的原因，同时XRD、FTIR结果表明高浓度的SO2所产生的大量SO42-是抑制催化剂活性的原因。 |
| 关键词: 二氧化硫 钙钛矿催化剂 碳烟氧化 表面活性氧 |
| 基金项目: |
| Abstract: La0.8K0.2Cu0.05Mn0.95O3 catalysts were prepared using the citrate acid-complex combustion method. Catalysts were characterized with XRD, FTIR, XPS. Temperature programmed oxidation(TPO) tests were performed to evaluate the catalytic activity for soot oxidation in a feed gas containing various concentrations of SO2. The TPO results revealed that the catalysts exhibited different activities with 0~0.1% SO2 in feed gas. The performance of the catalyst was enhanced with SO2 concentration below 0.05%, and 0.03% SO2 resulted in the highest activity. However, the soot oxidation rate decreased when the SO2 feed concentration was above 0.06%. The results of XPS indicated that the increase of weakly chemisorbed O- surface species was responsible for the excellent performance of La0.8K0.2Cu0.05Mn0.95O3 with lower concentration of SO2. The XRD and FTIR results revealed that plentiful SO42- was produced on the catalyst surface when SO2 concentration was high, which could account for the loss of activity of the La0.8K0.2Cu0.05Mn0.95O3 catalyst. |
| Keywords: sulfur dioxide perovskites-type catalyst soot oxidation superficial oxygen |
| |
| 摘要点击次数: 1934 |
| 全文下载次数: 2334 |
| 乐向晖,张 栖,付名利,黄碧纯,梁 红,叶代启.SO2对La0.8K0.2Cu0.05Mn0.95O3钙钛矿催化剂氧化碳烟的影响[J].无机化学学报,2009,25(7):1170-1176. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
