Journal ArticleDOI
Strategies to control zeolite particle morphology.
TLDR
This paper reviews the progresses achieved in zeolite morphology control and investigates theZeolite crystallization and crystal assembly mechanisms are investigated for providing an overall insight into the regulation of zeolites crystal morphology.Abstract:
Aluminosilicate zeolites with controllable morphology have attracted considerable attention due to their potential applications in catalysis, adsorption, and separation technologies, as well as the biomedical field. However, the rational design and preparation of zeolites with the required morphology have not been achieved because the zeolite crystallization mechanism has not been fully understood, and therefore, the nucleation and crystal growth processes cannot be oriented. This paper reviews the progresses achieved in zeolite morphology control. The chemical compositions of the synthesis gel, including template (or the structure-directing agent) and framework heteroatoms, silica and alumina sources, alkali metal cations and mineralization ions, crystallization conditions, and synthesis methods have a considerable impact on the crystal morphology. The oriented assembly of zeolite crystals into special morphologies, such as hierarchical porous structures, zeolite membranes, hollow zeolite spheres, and core@shell-structured zeolites, can be realized by using soft and/or hard template methods and adjusting the synthesis and crystallization conditions. In addition, zeolite crystallization and crystal assembly mechanisms are investigated for providing an overall insight into the regulation of zeolite crystal morphology.read more
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Towards the development of the emerging process of CO2 heterogenous hydrogenation into high-value unsaturated heavy hydrocarbons
TL;DR: In this paper, the authors provide a comprehensive, authoritative and critical overview of the substantial progress in the synthesis of α-olefins and aromatics from CO2 hydrogenation via direct and indirect routes.
Journal ArticleDOI
Platelike MFI Crystals with Controlled Crystal Faces Aspect Ratio.
Weijiong Dai,Weijiong Dai,Cassandre Kouvatas,Wenshu Tai,Guangjun Wu,Naijia Guan,Landong Li,Valentin Valtchev,Valentin Valtchev +8 more
TL;DR: In this article, a simple synthetic strategy was developed to reduce the thickness along the b-axis of MFI-type crystals, thus providing a short diffusion path along the straight channel.
Journal ArticleDOI
Recent progress on thin film composite membranes for CO2 separation
TL;DR: In this paper, a review of thin-film composite membranes for CO2 separation is presented, with a brief analysis on the challenges of materials and membrane preparation in large-scale.
Journal ArticleDOI
Impact of acid site speciation and spatial gradients on zeolite catalysis
TL;DR: A mini-review of the state of the art in acid site control in zeolite catalysts can be found in this paper, where a variety of commercially relevant reactions are discussed.
Journal ArticleDOI
Template free synthesis of hierarchical porous zeolite Beta with natural kaolin clay as alumina source
Yuanyuan Yue,Guo Xiaoxue,Liu Tao,Haiyan Liu,Wang Tinghai,Pei Yuan,Zhu Haibo,Zhengshuai Bai,Xiaojun Bao +8 more
TL;DR: In this article, a template free synthesis route was developed for the synthesis of hierarchical zeolite Beta from a natural layered aluminosilicate mineral kaolin, and a detailed study on the crystallization of hierarchical Beta zerosolite was performed to establish the optimized synthesis condition, and the synthesized hierarchical Beta zeolites were fully studied by XRD, IR, SEM, TEM, BET, NH3-TPD, Py-IR and NMR techniques.
References
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Journal ArticleDOI
From Microporous to Mesoporous Molecular-Sieve Materials and Their Use in Catalysis
TL;DR: Corma et al. as mentioned in this paper used the Dupont Award on new materials (1995), and the Spanish National Award “Leonardo Torres Quevedo” on Technology Research (1996) on technology research (1996), to recognize the performance of zeolites as catalysts for oil refining and petrochemistry.
Journal ArticleDOI
Open-Framework Inorganic Materials.
TL;DR: Aluminosilicate zeolites such as UTD-1 belong to a family of nanoporous inorganic materials that find utility in catalysis, separation, and ion exchange.
Journal ArticleDOI
Stable single-unit-cell nanosheets of zeolite MFI as active and long-lived catalysts
Minkee Choi,Kyungsu Na,Jeongnam Kim,Jeongnam Kim,Yasuhiro Sakamoto,Yasuhiro Sakamoto,Osamu Terasaki,Osamu Terasaki,Ryong Ryoo,Ryong Ryoo +9 more
TL;DR: It is shown that appropriately designed bifunctional surfactants can direct the formation of zeolite structures on the mesoporous and microporous length scales simultaneously and thus yield MFI (ZSM-5, one of the most important catalysts in the petrochemical industry) zeolites that are only 2 nm thick, which corresponds to the b-axis dimension of a single MFI unit cell.
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