Influence of the La/Ce Ratio on La-Ce Oxides Promoted by Sr in the Methane Oxidative Coupling Reaction
SSRN, ISSN: 1556-5068
2024
- 154Usage
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Article Description
The high methane availability and its significant role as a greenhouse gas led the scientific community to pursue methods to utilize this resource. Within this framework, the oxidative coupling of methane (OCM) has been proposed 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 to provide surface electrophilic oxygen species, such as superoxides and peroxides, instrumental for boosting the selectivity towards C products. Given this, mixed lanthanum-cerium oxide (La-Ce) catalysts emerge as strong candidates in OCM due to their high thermal stability, oxygen mobility and high alkalinity. In this work, La-Ce mixed oxide catalysts were prepared through a surfactant-assisted hydrothermal method using different La/Ce ratios to fine-tune their basic properties, and promote oxygen mobility on the surface of the catalysts. Samples followed a volcano-shaped trend as the function of La content, with optimal performance at a La/Ce molar ratio equal to 2.1, attributed to the interplay among the high amount of basic sites and oxygen vacancies, increasing the presence of superoxide species over lattice oxygen. Moreover, the Sr-promoted catalyst presented an elevated density of strong basic sites while preserving the reactive oxygen species, achieving 20% of CH conversion, with 57% of C compounds selectivity at 750 °C and GHSV equal to 18.000 mL.g.h
Bibliographic Details
Elsevier BV
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