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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Carvalho, Kele T. G. [1] ; Araujo Silva, Domingos S. [1] ; Urquieta-Gonzalez, Ernesto A. [1]
Total Authors: 3
[1] Univ Fed Sao Carlos, Res Ctr Adv Mat & Energy, C Postal 676, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Industrial & Engineering Chemistry Research; v. 58, n. 17, p. 7044-7051, MAY 1 2019.
Web of Science Citations: 0

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)

FAPESP's process: 14/50249-8 - Green chemistry: sustainable synthetic methods employing benign solvents, safer reagents, and bio-renewable feedstock
Grantee:Arlene Gonçalves Corrêa
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 15/12304-0 - Evaluation of the photocatalytic activity of g-C3N4/Nb2O5 heterojunctions in the abatement of pollutants in gas phase
Grantee:Kele Tatiane Gomes Carvalho
Support type: Scholarships in Brazil - Post-Doctorate