Exploiting oxidative coupling of methane performed over La-2(Ce1-xMgx)(2)O7-delta catalysts with disordered defective cubic fluorite structure

Autor(es)

Petrolini, Davi D. ^[1] ; Marcos, Francielle F. C. ^[2] ; Lucredio, Alessandra F. ^[1] ; Mastelaro, Valmor R. ^[3] ; Assaf, Jose M. ^[4] ; Assaf, Elisabete M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Inst Chem, Ave Trabalhador Sao Carlense, 400, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Escola Politecn, Ave Prof Luciano Gualberto, T 3, 380, BR-05508010 Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Sao Carlos Inst Phys, Ave Trabalhador Sao Carlense, 400, BR-13560970 Sao Carlos, SP - Brazil

^[4] Univ Fed Sao Carlos, Rod W Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CATALYSIS SCIENCE & TECHNOLOGY; v. 11, n. 13, p. 4471-4481, JUL 7 2021.
• Citações Web of Science: 0

Resumo

The oxidative coupling of methane reaction to produce C-2 compounds was studied using La-2(Ce1-xMgx)(2)O7-delta catalysts with disordered defective cubic fluorite structures, varying the Mg content (0.0 <= x <= 1.0), CH4/O-2 ratio, temperature, and WHSV. The partial substitution of Ce by Mg in the structure modified the morphology, adjusted the reducibility, stabilized the Ce3+ species, and provided different concentrations of basic sites, which allowed a 42% increase in the yield of C-2, with ethylene as the major product. The catalyst with 0.4 Mg content in the structure provided C-2 selectivity of 52%, with CH4 conversion of 28%, even under conditions richer in O-2. The highest selectivity to C-2 (75%), with the highest selectivity to ethylene (39.1%), was achieved using a CH4 : O-2 ratio of 8 : 1. In addition, it was possible to operate at milder temperatures (650 degrees C), with satisfactory CH4 conversion (22%) and C-2 selectivity (54%). By decreasing the space velocity, the CH4 conversion and C-2 selectivity decreased with an ethylene/ethane ratio of 3. The inhibitory effects of H2O and CO2 were observed at lower space velocity. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 17/08293-8 - Projeto 14: síntese direta de metanol a partir de CO2
• Beneficiário: Francielle Candian Firmino Marcos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/10980-9 - Acoplamento oxidativo do metano utilizando catalisadores do tipo A2B2O7
• Beneficiário: Davi Domingos Petrolini
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/06246-7 - Aplicação do conceito de biorrefinaria a estações de tratamento biológico de águas residuárias: o controle da poluição ambiental aliado à recuperação de matéria e energia
• Beneficiário: Marcelo Zaiat
• Modalidade de apoio: Auxílio à Pesquisa - Temático