| Texto completo | |
| Autor(es): |
Catuzo, G. L.
;
de Lima, Y. L.
;
Petrolini, D. D.
;
Assaf, E. M.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CATALYSIS TODAY; v. 444, p. 11-pg., 2024-08-26. |
| Resumo | |
The high methane availability and its significant role as a greenhouse gas have led the scientific community to pursue methods for its use. This paper proposes the usage of the oxidative coupling of methane (OCM) as a promising path to transform methane directly into value-added hydrocarbons, mostly ethylene, which serves as a crucial compound in the petrochemical sector. An efficient OCM catalyst should contain substantial basicity and oxygen vacancies for providing surface electrophilic oxygen species, such as superoxides and peroxides, instrumental for boosting selectivity towards C2 products. Mixed lanthanum-cerium oxide (La-Ce) catalysts have emerged as strong candidates in OCM due to their high thermal stability, oxygen mobility, and high alkalinity. In this study, they were prepared through a surfactant-assisted hydrothermal method with different La/Ce ratios for fine-tuning their basic properties and promoting oxygen mobility on the surface of the catalysts. Samples followed a volcano-shaped relationship between C2 yield and La content, with optimal performance at a La/Ce molar ratio of 2.1, attributed to the interplay between the high amount of basic sites and oxygen vacancies, increasing the presence of superoxide species over lattice oxygen. Moreover, the Sr-promoted catalyst showed high density of strong basic sites while preserving the reactive oxygen species, achieving 20 % CH4 conversion, with 57 % C2 compounds selectivity at 750 degrees C and GHSV of 18.000 mL.gcat (AU) | |
| Processo FAPESP: | 24/01433-2 - Aplicação de catalisadores zeolíticos multifuncionais para conversão direta do furfural em -valerolactona |
| Beneficiário: | Yuri Luiz de Lima |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 23/10582-9 - Reações tandem de redução de CO2 e desidroaromatização do etano sobre catalisadores bifuncionais de zeólita/hidróxidos duplos lamelares |
| Beneficiário: | Gabriel Liscia Catuzo |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 22/10615-1 - Consolidação do conceito de biorrefinaria aplicado ao tratamento biológico de águas residuárias e de resíduos sólidos |
| Beneficiário: | Marcelo Zaiat |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| 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 |