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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 32, n. 5, p. 1051-1059, 2021-04-30.

Abstract

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)

• FAPESP's process: 19/09078-9 - Study of catalysts derived from chabazite for application in reactions of hydrogenation of CO2 to products
• Grantee: Bianca Rocha Florindo
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 18/01258-5 - Novel chemical catalytic and photocatalytic processes for the direct conversion of methane and CO2 to products
• Grantee: José Maria Correa Bueno
• Support Opportunities: Research Projects - Thematic Grants