Lanthanum-ceria modified with calcium for oxidative coupling of methane
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2022
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BRAZIL MRS MEETING, 20th
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Resumo
Ethylene (C2H4) is considered a fundamental component of the chemical industry, it is a raw
material widely used to produce plastics, solvents, fertilizers, etc. Currently, the main route
to obtain C2H4is the steam cracking of naphtha from crude oil, a well-established technology
that is hardly challenged. The search for more sustainable alternatives must be ongoing,
and among the alternative, we can mention the use of natural gas. The oxidative coupling of
methane (OCM), the main component of natural gas, is a compelling direct pathway of
methane (CH4) conversion into higher added value hydrocarbons, such as C2(C2H6and C2H4).
[1] La2Ce2O7catalyst performs well in OCM due to its high thermal stability, suitable alkaline
sites, and selective mobile oxygen sites. Doping La2Ce2O7with Ca increases the alkalinity,
which can considerably increase C2selectivity in the OCM. We have explored a scalable
method of combustion synthesis, a high-throughput technique that provides favorable
porous microstructures for stable catalysts at high temperatures. The obtained La2Ce2-
xCaxO7powders (0 ≤ x ≤ 0.5) SEM images evidenced a microstructure composed of porous
sponge-like agglomerated particles with an irregular shape, expected from the type of
synthesis. The materials showed crystalline structures of disordered fluorite and C-type,
indicated by both XRD and Raman analysis. Raman spectroscopy data also evidenced the
presence of surface oxygen vacancies on materials, which benefited the OCM reaction. The
catalytic tests showed us that the addition of Ca increased the C2selectivity by 10%, at
750oC and a CH4:O2molar ratio of 6:1. [2].
Como referenciar
THYSSEN, VIVIAN V.; VILELA, VANESSA B.; FONSECA, FABIO C. Lanthanum-ceria modified with calcium for oxidative coupling of methane. In: BRAZIL MRS MEETING, 20th, September 25-29, 2022, Foz do Iguaçu, PR. Abstract... São Carlos, SP: Aptor Software, 2022. Disponível em: http://repositorio.ipen.br/handle/123456789/33564. Acesso em: 06 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.