Catalytic and kinetic evaluation of Fe/HZSM-5 catalyst for Fischer-Tropsch synthesis

Autor(es)

da Silva, Lucas Alves ; Heczko, Vilma ; Schmal, Martin ; Camargo, Pedro Henrique Cury ; Alves, Rita Maria Brito ; Giudici, Reinaldo

• Tipo de documento: Artigo Científico
• Fonte: CHEMICAL ENGINEERING JOURNAL; v. 505, p. 14-pg., 2025-01-08.

Resumo

Rising global energy and growing environmental concerns demand cleaner production methods for fuels and platform chemicals. The Fischer-Tropsch synthesis (FTS) is a promising alternative to fossil oil sources for producing valuable hydrocarbons directly from syngas (CO and H-2) such as light olefins and middle distillates. Due to their cost-effectiveness and bifunctional properties, Fe/HZSM-5 catalysts have gained recent interest for FTS. However, research on reaction conditions and CO consumption kinetics for this catalyst remains limited. This work addresses a comprehensive study encompassing catalyst characterization, catalytic activity evaluation, and kinetic modeling of Fe/HZSM-5 catalysts for FTS. Our data showed that Fe presented multiple reduction stages and changed the moderate acidity of the evaluated zeolites upon Fe impregnation. Fe2O3 particles were also found to be transformed into iron carbides species during the catalytic reaction according to the M & ouml;ssbauer spectroscopy. The catalysts were active and stable for FTS (X-CO > 50 %) with a major production of hydrocarbons in C-2-C-4 and C-5-C-8 ranges. Pressure, temperature, feed composition and space velocity significantly influenced the CO conversion. The kinetic model for the Fe/HZSM-5 catalyst was investigated by modeling and in situ DRIFTS, aligning with the carbide mechanism considering dissociative adsorption of CO and H-2, a two-site reaction pathway, and competitive adsorption between CO and CO2 on the metal sites. These findings provide important insights for optimizing catalyst design and reaction conditions to enhance the efficiency of syngas-based fuel production. (AU)

• Processo FAPESP: 19/12856-3 - EMU concedido no processo 2014/50279-4: equipamento de quimissorção, Autochem II 2920-Micromeritics
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 21/05329-7 - Caracterização e avaliação em processo de catalisadores nano-estruturados e do tipo SACs de Ni e Fe suportados em zeólitas paro o processo de síntese de Fischer-Tropsch
• Beneficiário: Lucas Alves da Silva
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 22/07813-6 - Síntese controlada de novos nanocatalisadores e catalisadores plasmônicos para síntese de Fischer-Tropsch e produção de hidrogênio via water splitting
• Beneficiário: Lucas Alves da Silva
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado
• Processo FAPESP: 22/04751-0 - Contribuição ao desenvolvimento de tecnologia de reatores para a conversão de CO2 em combustível de aviação (Projeto 4AirCRAFT)
• Beneficiário: Reinaldo Giudici
• Modalidade de apoio: Auxílio à Pesquisa - Regular