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Cooperative Co 0 /Co II Sites Stabilized by a Perovskite Matrix Enable Selective C-O and C-C bond Hydrogenolysis of Oxygenated Arenes

Cooperative Co 0 /Co II Sites Stabilized by a Perovskite Matrix Enable Selective C-O and C-C bond Hydrogenolysis of Oxygenated Arenes

Manish Shetty, Daniela Zanchet, William H Green, Yuriy Román-Leshkov

ChemSusChem. 2019 May 21;12(10):2171-2175.

PMID: 30848866

Abstract:

Strontium-substituted lanthanum cobaltite (La0.8 Sr0.2 CoO3 ) matrix-stabilized Co0 /CoII catalytic sites were prepared, which present tunable C-O and C-C hydrogenolysis activity for the vapor-phase upgrading of oxygenated arenes. CoII sites associated with oxygen vacancies were favored at low temperatures and performed selective C-O hydrogenolysis, in which Sr-substitution facilitated oxygen vacancy formation, leading to approximately 10 times higher reactivity compared to undoped LaCoO3 . Co0 sites were favored at high temperatures and performed extensive C-C bond hydrogenolysis, generating a wide range of alkanes. The lower reaction order with P H 2 (1.1±0.1) for C-C hydrogenolysis than for C-O hydrogenolysis (2.0±0.1) led to a high selectivity towards C-C hydrogenolysis at low P H 2 . The Co3 O4 surfaces featured a narrower temperature window for obtaining the respective optimal CoII and Co0 pairs compared to analogous perovskite surfaces; whereas, the perovskite matrix stabilizes these pairs for selective C-O and C-C hydrogenolysis. This stabilization effect offers an additional handle to control reactivity in oxide catalysts.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP108916092	Lanthanum strontium cobaltite, LSC-82		108916-09-2	Price

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