Oxidative coupling of methane over alkaline earth oxides deposited on commercial support precoated with rare earth oxides

V. R. Choudhary; S.A.R. Mulla; B.S. Uphade

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Oxidative coupling of methane over alkaline earth oxides deposited on commercial support precoated with rare earth oxides

机译：甲烷在碱土金属氧化物上的氧化偶联，碱土金属氧化物沉积在预先涂有稀土氧化物的商业载体上

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A number of supported catalysts, prepared by depositing alkaline earth (viz. Mg, Ca, Sr and Ba) oxides on a commercial support (SA- 5205) precoated with various rare earth (viz. La, Ce, Nd, Sm, Gd, Er and Yb) oxides have been evaluated for their surface properties and activity/selectivity in oxidative coupling of methane (OCM) at low contact time (GHSV = 1.02 × 10~5 cm~3 g~(-1) h~(-1)). The catalysts have been characterized for their basicity and acidity distributions by temperature programmed desorption (TPD) Of CO_2 and ammonia from 50 deg C to 950 deg C, respectively, and for their oxygen chemisorption sites by TPD of O_2. The OCM activity of the catalysts has been correlated with their basic sites measured in terms of the CO_2 desorbed between 500 deg C and 950 deg C. The catalysts with La_2O_3 and/or Nd_2O_3, showing good OCM activity, have been compared for their performance in the OCM process at different temperatures (750 deg C-850 deg C), and CH_4/O_2 ratios (4.0- 20.0) in the feed. At 850 deg C, the catalyst with SrO deposited on the support precoated with mixed La_2O_3-Nd_2O_3 shows best performance in the OCM process.

机译：通过在预先涂有各种稀土金属（例如La，Ce，Nd，Sm，Gd）的商品化载体（SA-5205）上沉积碱土金属氧化物（即Mg，Ca，Sr和Ba）氧化物而制得的许多载体催化剂，已对Er和Yb）氧化物在低接触时间（GHSV = 1.02×10〜5 cm〜3 g〜（-1）h〜（-1）下的甲烷氧化偶联（OCM）的表面性质和活性/选择性进行了评估））。催化剂的特征在于它们的碱度和酸度分布分别是从50℃到950℃的CO_2和氨的程序升温脱附（TPD），以及它们的O_2的TPD对氧的化学吸附位点。催化剂的OCM活性已与其在500℃至950℃之间解吸的CO_2的碱性位点相关联。比较了La_2O_3和/或Nd_2O_3表现出良好的OCM活性的催化剂的性能。在不同温度（750℃至850℃）和进料中CH_4 / O_2比（4.0-20.0）下进行OCM处理。在850摄氏度下，具有SrO的催化剂沉积在预先涂有混合La_2O_3-Nd_2O_3的载体上，在OCM工艺中表现出最佳性能。

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来源
《Fuel》 |1999年第4期|p.427-437|共11页
作者
V. R. Choudhary; S.A.R. Mulla; B.S. Uphade;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类燃料化学工业（总论）;热力工程、热机;
关键词
Surface acidity and basicity; TPD of ammonia; TPD of;

机译：表面酸度和碱度;氨的TPD;TPD的;

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2. Effects of alkali and alkaline-earth metal dopants on magnesium oxide supported rare-earth oxide catalysts in the oxidative coupling of methane [J] . Elkins Trenton W., Roberts Samantha J., Hagelin-Weaver Helena E. Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications . 2016,第Null期

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5. Methane conversion to synthesis gas over platinum supported on rare earth oxides. [D] . Pantu, Piboon. 2001

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6. Phase Equilibria in Systems Involving the Rare-Earth Oxides. Part I. Polymorphism of the Oxides of the Trivalent Rare-Earth Ions [O] . R. S. Roth, S. J. Schneider 1960

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7. Active-oxygen species on non-reducible rare-earth-oxide-based catalysts in oxidative coupling of methane [O] . Zhang HB, 张鸿斌, Lin GD, 2001

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8. Developmental Studies of Potential Chemically Pumped Electronic Transition Lasers: Combustion of Alkaline Earths in Nitrous Oxide-Carbon Monoxide and Reactions of Metastable Alkaline Earth Atoms. [R] . Benard, D. J., Slafer, W. D., Lee, P. H. 1978

机译：潜在化学泵浦电子跃迁激光器的发展研究：碱性土壤在一氧化二氮 - 一氧化碳中的燃烧和亚稳碱土原子的反应。

Oxidative coupling of methane over alkaline earth oxides deposited on commercial support precoated with rare earth oxides

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