open access

https://hdl.handle.net/2115/71974

Trace mono-atomically dispersed rhodium on zeolite-supported cobalt catalyst for the efficient methane oxidation

英語

2018-08-01

Nature Publishing Group

Communications Chemistry

1

UNSP 41

The partial oxidation of methane is a promising method for the efficient production of syngas. To implement this process using common stainless steel reactors, an inexpensive catalyst that functions at 650 degrees C or below is necessary. However, base metal catalysts typically require much higher temperatures, and they are deactivated by re-oxidation and coke formation. Here we report that modification of a zeolite-supported 3 wt% cobalt catalyst with a trace amount of mono-atomically dispersed rhodium (0.005 wt%) dramatically improves catalytic performance and durability. Cobalt/mordenite is nearly inactive due to the oxidation of cobalt, but the catalyst modified with rhodium continuously gives 85-86% methane conversion and 90-91% CO selectivity with an H-2/CO ratio of 2.0 without serious coking at 650 degrees C. During the reaction, mono-atomically dispersed rhodium converts cobalt oxide to Co-0 active species via hydrogen spillover. Use of the zeolite support is key to the high catalytic performance.

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2399-3669