Mesoporous HBeta zeolites application in the desulfurization of 2-methylthiophene

• Published in: Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2021-02, Vol.132 (1), p.401-416
• Main Authors: de Oliveira, Angélica Amaral, da Silva, Verônica Lima, de Aguiar Pontes, Danilo, Almeida, Daniel Freire, Silva, Domingos Sérgio Araújo, Ferreira, José Marcos Moreira, Santos, Ronaldo Costa, Urquieta-Gonzalez, Ernesto Antonio, Pontes, Luiz Antônio Magalhães
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Physical Chemistry
• ISSN: 1878-5190; 1878-5204
• DOI: 10.1007/s11144-020-01921-6

The generation of mesoporosity in Beta zeolite through desilication promoted an increase in the formation of H 2 S in the transformation of 2-methylthiophene in an n-hexane stream. The desilication approach was studied using statistical analyses, through which it could be observed that, among the studied process variables (NaOH concentration, temperature, and time), concentration was the only variable significant to the mesoporosity generation response variable. Every catalyst subjected to alkaline treatment had an increase in mesopore volume. The thus generated mesoporosity improved 2-methylthiophene intracrystalline diffusion and this, consequently, enhanced the accessibility to the strong internal Brønsted acid sites. Therefore, the yield to H 2 S was increased from 35% on the precursor zeolite to 71% on the desilicated zeolite. The latter presented the greatest H 2 S formation. This result clearly demonstrates the potential mesoporous HBeta zeolites have. It shows they can be applied as additives in fluid catalytic cracking catalysts for sulfur reduction in fuel feedstocks.