Generation of 3D-Intracrystalline Diffusion Structures from a 1D/12MR HZSM-12 Zeolite: Improvements in the Catalytic Stability

Autor(es)

Carvalho, Kele T. G. ^[1] ; Araujo Silva, Domingos S. ^[1] ; Urquieta-Gonzalez, Ernesto A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Res Ctr Adv Mat & Energy, C Postal 676, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Industrial & Engineering Chemistry Research; v. 58, n. 17, p. 7044-7051, MAY 1 2019.
• Citações Web of Science: 0

Resumo

Three-dimensional-intracrystalline diffusion structures were prepared from a 1D/12MR-HZSM-12 zeolite that was desilicated with NaOH solutions at different temperatures. The results showed that carefully tuned desilication preserved most of the crystalline structure and revealed that even though the strong acid sites had decreased, the hierarchical zeolites exhibited similar initial activities compared to that of the 1D-microporous precursor. Moreover, the new textural and acid properties of the desilicated zeolites strongly improved the catalytic stability during cyclohexane conversion. That stability, a key factor to be considered in the engineering scale-up of the catalyst, resulted from the decrease of the strong acid sites and more importantly from improvements in the molecular diffusion inside of the new 3D-intracrystalline porous structure that decreased the contact time, minimizing subsequent reactions that could lead to coke formation, thus avoiding deactivation. Otherwise, the presence of mesopores favored the selectivity to C6 cyclohexane isomers. (AU)

• Processo FAPESP: 14/50249-8 - Green chemistry: sustainable synthetic methods employing benign solvents, safer reagents, and bio-renewable feedstock
• Beneficiário: Arlene Gonçalves Corrêa
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 15/12304-0 - AVALIAÇÃO DA ATIVIDADE FOTOCATALÍTICA DE HETEROJUNÇÕES g-C3N4/Nb2O5 NO ABATIMENTO DE POLUENTES EM FASE GASOSA
• Beneficiário: Kele Tatiane Gomes Carvalho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado