Oxidative coupling of methane over Sm-promoted MgO: Influence of composition and preparation conditions

✍ Scribed by Vasant R. Choudhary; Vilas H. Rane

• Publisher: Wiley (John Wiley & Sons)
• Year: 1997
• Tongue: English
• Weight: 267 KB
• Volume: 70
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/(sici)1097-4660(199712)70:4<325::aid-jctb767>3.0.co;2-#

✦ Synopsis

InÑuences of promoter concentration (or Sm/Mg ratio), precursor for MgO (viz. Mg-acetate, Mg-carbonate and Mg-hydroxide), calcination temperature of Sm-promoted MgO catalyst on the catalytic activity/selectivity in the oxidative coupling of methane (OCM) at di †erent temperatures (650È850¡C) and ratios in feed (2É0È8É0) at a high space velocity (51 600 cm3 g~1 h~1) CH 4 /O 2 have been investigated. The catalytic activity/selectivity of SmÈMgO catalysts in the OCM are found to be strongly inÑuenced by the Sm/Mg ratio, precursor used for MgO and catalyst calcination temperature. The catalyst with Sm/Mg ratio of 0É11, prepared using magnesium acetate and magnesium carbonate as a source of MgO and calcining at 950¡C, is found to be highly active and selective in the OCM process. A drastic reduction in catalytic activity/selectivity is observed when the catalyst is supported on low surface area porous catalyst carriers, indicating strong catalystÈsupport interactions.