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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Shetty, Manish [1] ; Zanchet, Daniela [2, 1] ; Green, William H. [1] ; Roman-Leshkov, Yuriy [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] MIT, Dept Chem Engn, Cambridge, MA 02139 - USA
[2] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: CHEMSUSCHEM; v. 12, n. 10, p. 2171-2175, MAY 21 2019.
Citações Web of Science: 2
Resumo

Strontium-substituted lanthanum cobaltite (La0.8Sr0.2CoO3) matrix-stabilized Co-0/Co-II catalytic sites were prepared, which present tunable C-O and C-C hydrogenolysis activity for the vapor-phase upgrading of oxygenated arenes. Co-II 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 10times higher reactivity compared to undoped LaCoO3. Co-0 sites were favored at high temperatures and performed extensive C-C bond hydrogenolysis, generating a wide range of alkanes. The lower reaction order with PH2 (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 PH2 . The Co3O4 surfaces featured a narrower temperature window for obtaining the respective optimal Co-II and Co-0 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. (AU)

Processo FAPESP: 15/23900-2 - Avaliação de materiais alternativos abundantes como próxima geração de catalisadores para conversão de biomassa lignocelulósica
Beneficiário:Daniela Zanchet
Modalidade de apoio: Bolsas no Exterior - Pesquisa