Influence of precursors of Li 2O and MgO on surface and catalytic properties of Li-promoted MgO in oxidative coupling of methane

Wei Tung Liao, Wen Jhy Lee, Chuh Yung Chen, Lien Te Hsieh, Ching Cheng Lai

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7 Citations (Scopus)

Abstract

The influence of the catalyst precursors (for Li 2O and MgO) used in the preparation of Li-doped MgO (Li/Mg=0.1) on its surface properties (viz basicity, CO 2 content and surface area) and activity/selectivity in the oxidative coupling of methane (OCM) process at 650-750 °C (CH 4/O 2 feed ratio=3.0-8.0 and space velocity=5140-20550 cm 3g -1h -1) has been investigated. The surface and catalytic properties are found to be strongly affected by the precursor for Li 2O (viz lithium nitrate, lithium ethanoate and lithium carbonate) and MgO (viz magnesium nitrate, magnesium hydroxide prepared by different methods, magnesium carbonate, magnesium oxide and magnesium ethanoate). Among the Li-MgO (Li/MgO=0.1) catalysts, the Li-MgO catalyst prepared using lithium carbonate and magnesium hydroxide (prepared by the precipitation from magnesium sulfate by ammonia solution) and lithium ethanoate and magnesium acetate shows high surface area and basicity, respectively. The catalysts prepared using lithium ethanoate and magnesium ethanoate, and lithium nitrate and magnesium nitrate have very high and almost no CO 2 contents, respectively. The catalysts prepared using lithium ethanoate or carbonate as precursor for Li 2O, and magnesium carbonate or ethanoate, as precursor for MgO, showed a good and comparable performance in the OCM process. The performance of the other catalysts was inferior. No direct relationship between the basicity of Li-doped MgO or surface area and its catalytic activity/selectivity in the OCM process was, however, observed. (C) 2000 Society of Chemical Industry.

Original languageEnglish
Pages (from-to)828-834
Number of pages7
JournalJournal of Chemical Technology and Biotechnology
Volume75
Issue number9
DOIs
Publication statusPublished - 2000 Sep

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Waste Management and Disposal
  • Pollution
  • Organic Chemistry
  • Inorganic Chemistry

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