Porosity of CHA Zeolite Driving the Formation of Polyaromatic Coke Species in the Methanol to Olefins Reaction

Autor(es)

Bianca R. Florindo ^[1] ; Gabriel L. Catuzo ^[2] ; Leandro Martins ^[3]

Afiliação do(s) autor(es)

^[1] Universidade Estadual Paulista (Unesp). Instituto de Química - Brasil

^[2] Universidade Estadual Paulista (Unesp). Instituto de Química - Brasil

^[3] Universidade Estadual Paulista (Unesp). Instituto de Química - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 32, n. 5, p. 1051-1059, 2021-04-30.

Resumo

The pore size of the chabazite structure is exceptionally suitable for the methanol to olefins (MTO) reaction. The reaction has an induction period required for the formation of a hydrocarbon pool (HP), usually composed of aromatic compounds of different sizes. HP is alkylated by methanol and afterward cracked, leading to the formation of olefins. Despite the importance of HP, its formation and growth in size are exceedingly dependent on the porosity of the catalyst. The ideal is that the formed HP remains stable throughout the reaction because the growth in its size causes blockage of the small catalyst pores, decreasing its capacity. Herein we studied chabazite zeolites with different porosity and structure, caused by variation in the particle size and pores’ volume. Porosity influenced the formation of HP species in quantity (as revealed by thermogravimetric analysis (TGA)) and polymerization degree (gas chromatography coupled with mass spectrometer (GC-MS) analysis) and, consequently, the MTO reaction’s performance. (AU)

• Processo FAPESP: 19/09078-9 - Estudo de catalisadores derivados da chabazíta para aplicação em reações de hidrogenação de CO2 a produtos
• Beneficiário: Bianca Rocha Florindo
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 18/01258-5 - Novos processos catalíticos e fotocatalíticos para a conversão direta de metano e CO2 em produtos
• Beneficiário: José Maria Correa Bueno
• Modalidade de apoio: Auxílio à Pesquisa - Temático