The effect of A-site substitution by Sr, Mg and Ce on the catalytic performance of LaMnO3 catalysts for the oxidation of vinyl chloride emission
The effect of A-site substitution by Sr, Mg and Ce on the catalytic performance of LaMnO3 catalysts for the oxidation of vinyl chloride emission
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DOI：
10.1016/j.apcatb.2013.01.031
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发表时间：
2013-05
影响因子：
22.1
通讯作者：
Chuanhui Zhang;W. Hua;Chao Wang;Yanglong Guo;Yun Guo;G. Lu;A. Baylet;A. Giroir‐Fendler
中科院分区：
文献类型：
--
作者：
Chuanhui Zhang;W. Hua;Chao Wang;Yanglong Guo;Yun Guo;G. Lu;A. Baylet;A. Giroir‐Fendler
采用共沉淀法合成了LaMnO 3和La 0. 8A 0. 2 MnO 3（A=Sr，Mg和Ce）钙钛矿型氧化物，并将其用于氯乙烯（VC）尾气的催化氧化。采用多种表征技术研究了催化剂的物理化学性质与催化性能之间的关系。结果表明，铈和镁部分取代镧对催化剂的VC氧化性能有积极的影响，而锶涉及负面影响。在反应条件下（VC浓度= 1000 ppm，GHSV=15，000 h-1），就T50和T90的温度而言，就催化活性而言，从最好到最差的催化剂性能排序为La 0.8Ce 0.2MnO 3> La 0.8Mg 0.2MnO 3> LaMnO 3> La 0.8Sr 0.2MnO 3。Ce掺杂的钙钛矿型催化剂由于其较高的比表面积和促进低温还原的能力而表现出最佳的催化性能。此外，作为活性物种，表面吸附氧的增加也是催化剂性能提高的原因。
Catalytic oxidation of vinyl chloride (VC) emission was carried out over LaMnO3and La0.8A0.2MnO3(A=Sr, Mg and Ce) perovskite oxides synthesized via co-precipitation method. Numerous characterization techniques were performed to investigate the relationship between the catalytic performance and its physicochemical properties. It was found that the partial substitution of lanthanum by cerium and magnesium had a positive effect on the catalytic performance for VC oxidation, whereas strontium involved a negative effect. Under the reaction conditions (VC concentration=1000ppm, GHSV=15,000h−1), the overall catalyst ranking in terms of the catalytic activity from the best to the worst performance was La0.8Ce0.2MnO3>La0.8Mg0.2MnO3>LaMnO3>La0.8Sr0.2MnO3with regard to the temperature of T50and T90. The Ce-doped perovskite catalyst showed the optimum catalytic performance due to its higher specific surface area and its ability to promote the low-temperature reducibility. Moreover, as the active species, the increased surface adsorbed oxygen was also responsible for the enhancement of the catalytic performance.