| Full text | |
| Author(s): |
Catuzo, G. L.
;
de Lima, Y. L.
;
Petrolini, D. D.
;
Assaf, E. M.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | CATALYSIS TODAY; v. 444, p. 11-pg., 2024-08-26. |
| Abstract | |
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) | |
| FAPESP's process: | 24/01433-2 - Application of multifunctional zeolitic catalysts for direct conversion of furfural into - valerolactone |
| Grantee: | Yuri Luiz de Lima |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 23/10582-9 - Tandem reactions of CO2 reduction and ethane dehydroaromatization over bifunctional zeolite/layered double hydroxide catalysts |
| Grantee: | Gabriel Liscia Catuzo |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 22/10615-1 - Consolidation of the biorefinery concept applied to the biological treatment of wastewater and solid wastes |
| Grantee: | Marcelo Zaiat |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/10980-9 - Oxidative Coupling of Methane using A2B2O7 catalysts |
| Grantee: | Davi Domingos Petrolini |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |