Effect of the introduction of tetrachloromethane into the feedstream for methane oxidation with oxygen and nitrous oxide on thermally stable ... View Full Text


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Article Info

DATE

1998-11

AUTHORS

Shigeru Sugiyama, Etsushi Nitta, Keiichi Abe, Hiromu Hayashi, John B. Moffat

ABSTRACT

Thermally stable strontium hydroxyapatite (SrHAp) was prepared with a variety of stoichiometries and employed as catalysts for the oxidation of methane with oxygen and nitrous oxide in the presence and absence of tetrachloromethane (TCM) as a gas‐phase additive. In contrast to the oxidation of methane on thermally unstable SrHAp, non‐selective oxidation to CO and CO2 at 873 K proceeded with oxygen while the selectivity to CO increased with increasing time‐on‐stream in the presence of TCM and was higher than 90% at 6 h on‐stream, regardless of the Sr/P ratios in the catalysts. However, with nitrous oxide the selectivity to CO in the presence of TCM was strongly influenced by the Sr/P ratio with smaller values producing higher CO selectivity. In the presence of TCM, the catalyst consists of a complex mixture of the hydroxyapatite, the corresponding chlorapatite, phosphate, chloride and oxychloride, each of which contributes dissimilarly to the catalytic process. More... »

PAGES

189-196

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1019067920098

DOI

http://dx.doi.org/10.1023/a:1019067920098

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1040758902


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