Volume 136, Issue 6 e202314217
Forschungsartikel

Post-Synthetic Ensembling Design of Hierarchically Ordered FAU-type Zeolite Frameworks for Vacuum Gas Oil Hydrocracking

Rajesh Kumar Parsapur

Corresponding Author

Rajesh Kumar Parsapur

Division of Physical Sciences and Engineering and KAUST Catalysis Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Saudi Arabia

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Amol M. Hengne

Amol M. Hengne

Division of Physical Sciences and Engineering and KAUST Catalysis Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Saudi Arabia

Agency for Science, Technology, and Research, and Institute of Materials Research and Engineering, and Institute of Sustainability for Chemicals, Energy and Environment, Singapore, 138634 Singapore

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Georgian Melinte

Georgian Melinte

Core Labs, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Saudi Arabia

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Omer Refa Koseoglu

Omer Refa Koseoglu

Catalysis Center of Excellence, Research & Development Center, Saudi Aramco, Dhahran, 31311 Saudi Arabia

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Robert Peter Hodgkins

Robert Peter Hodgkins

Advanced Materials Team, Catalyst Center of Excellence R&D Division, Research & Development Center, Saudi Aramco, Dhahran, 31311 Saudi Arabia

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Anissa Bendjeriou-Sedjerari

Anissa Bendjeriou-Sedjerari

Division of Physical Sciences and Engineering and KAUST Catalysis Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Saudi Arabia

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Zhiping Lai

Corresponding Author

Zhiping Lai

Division of Physical Sciences and Engineering and Advanced Membranes and Porous Materials Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Saudi Arabia

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Kuo-Wei Huang

Corresponding Author

Kuo-Wei Huang

Division of Physical Sciences and Engineering and KAUST Catalysis Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Saudi Arabia

Agency for Science, Technology, and Research, and Institute of Materials Research and Engineering, and Institute of Sustainability for Chemicals, Energy and Environment, Singapore, 138634 Singapore

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First published: 16 October 2023
Citations: 3

Abstract

Zeolites hold importance as catalysts and membranes across numerous industrial processes that produce most of the world's fuels and chemicals. In zeolite catalysis, the rate of molecular diffusion inside the micropore channels defines the catalyst's longevity and selectivity, thereby influencing the catalytic efficiency. Decreasing the diffusion pathlengths of zeolites to the nanoscopic level by fabricating well-organized hierarchically porous architecture can efficiently overcome their intrinsic mass-transfer limitations without losing hydrothermal stability. We report a rational post-synthetic design for synthesizing hierarchically ordered FAU-type zeolites exhibiting 2D-hexagonal (P6mm) and 3D-cubic (Ia d) mesopore channels. The synthesis involves methodical incision of the parent zeolite into unit-cell level zeolitic fragments by in situ generated base and bulky surfactants. The micellar ensembles formed by these surfactant-zeolite interactions are subsequently reorganized into various ordered mesophases by tuning the micellar curvature with ion-specific interactions (Hofmeister effect). Unlike conventional crystallization, which offers poor control over mesophase formation due to kinetic constraints, crystalline mesostructures can be developed under dilute, mild alkaline conditions by controlled reassembly. The prepared zeolites with nanometric diffusion pathlengths have demonstrated excellent yields of naphtha and middle-distillates in vacuum gas oil hydrocracking with decreased coke deposition.

Conflict of interest

Patent applications (Appl. No.—US 18/151,782; US 18/151,984, US 18/151,892; US 17/857,572) have been filed. Pilot-scale catalyst formulations are in progress.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.