The comparison of mesoporous HZSM-5 zeolite catalysts prepared by different mesoporous templates and their catalytic performance in the methanol to aromatics reaction

Zhou, Ma-xi; Wang, Fei; Xiao, Weiyin; Gao, Lijing; Xiao, Guomin

doi:10.1007/s11144-016-1076-8

Cited by 16 publications

(5 citation statements)

References 48 publications

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“…Therefore, the preparation of suitable catalysts which exhibit high diffusion and suitable acidity is important for the MTA reaction. An effective method to reduce the diffusion limitation is introducing additional pores into zeolites, which can significantly facilitate the diffusion performance of the bulky aromatic molecules − and prevent the coke deposition on the micropores in the MTA process. Wang et al synthesized hierarchical ZSM-5 with a hollow structure, in which the shell was aggregated by small coffinlike ZSM-5 crystals (Figure F).…”

Section: Applicationsmentioning

confidence: 99%

Hierarchically Structured Zeolites: From Design to Application

et al. 2020

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Hierarchical zeolites combine the intrinsic catalytic properties of microporous zeolites and the enhanced access and transport of the additional meso-and/or macroporous system. These materials are the most desirable catalysts and sorbents for industry and become a highly evolving field of important current interests. In addition to the enhanced mass transfer leading to high activity, selectivity, and cycle time, another essential merit of the hierarchical structure in zeolite materials is that it can significantly improve the utilization effectiveness of zeolite materials resulting in the minimum energy, time, and raw materials consumption. Substantial progress has been made in the synthesis, characterization, and application of hierarchical zeolites. Herein, we provide an overview of recent achievements in the field, highlighting the significant progress in the past decade on the development of novel and remarkable strategies to create an additional pore system in zeolites. The most innovative synthesis approaches are reviewed according to the principle, versatility, effectiveness, and degree of reality while establishing a firm link between the preparation route and the resultant hierarchical pore quality in zeolites. Zeolites with different hierarchically porous structures, i.e., micro-mesoporous structure, micromacroporous structure, and micro-meso-macroporous structure, are then analyzed in detail with concrete examples to illustrate their benefits and their fabrications. The significantly improved performances in catalytic, environmental, and biological applications resulting from enhanced mass transport properties are discussed through a series of representative cases. In the concluding part, we envision the emergence of "material-properties-by-quantitative and real rational design" based on the "generalized Murray's Law" that enables the predictable and controlled productions of bioinspired hierarchically structured zeolites. This Review is expected to attract important interests from catalysis, separation, environment, advanced materials, and chemical engineering fields as well as biomedicine for artificial organ and drug delivery systems.

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Section: Applicationsmentioning

confidence: 99%

Hierarchically Structured Zeolites: From Design to Application

et al. 2020

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“…reaction in case of the hard templated ZSM-5, as reflected in the higher BTX yield and lower carbon deposition rate. [103] Other ways to induce mesopores are the use of organosilane or organosiloxane templates. Mesoporous high-silica ZSM-5 was for instance synthesized in the presence of dimethylhexadecyl [3-(trimethoxysilyl)propyl] ammonium chloride (TPHAC) in a seed-induced method, and contained intracrystalline mesopores of ≈2-10 nm, which is in accordance with the micellar size of TPHAC.…”

Section: Zsm-5mentioning

confidence: 99%

“…This difference in pore architecture led to better catalytic results for the MTH reaction in case of the hard templated ZSM‐5, as reflected in the higher BTX yield and lower carbon deposition rate. [ 103 ]…”

Section: Synthesis Of Hierarchical 10‐mr Zeolitesmentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

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Zeolites are highly crystalline aluminosilicates with welldefined pores that are constructed of SiO 2 and AlO 4 tetrahedra. These tetrahedra can be linked together in different unique ways to form various materials with a specific topology. [1] According to the International Zeolite Association (IZA), more than 250 different topologies, which are all assigned with a three-letter code, have been identified. [2] The micropores in zeolites are typically constructed from 8, 10, or 12 tetrahedral atoms

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“…Therefore, the template method has been preferred because it produces a larger mesopores between 3-12 nm while maintaining crystalline framework. 21 Hierarchical ZSM-5 was obtained by self-assembly of the aluminosilicate gel to form large pores 21 employing various templates such as tetrapropylammonium hydroxide (TPAOH), 25 tetraethylammonium hydroxide (TEAOH), 26 carbon nano tube, 27 graphene, 28 organosilanes ( [3-(trimethoxysilyl)propyl] ammonium chloride (TPHAC)), 29,30 surfactants (CTAB), [31][32][33] or polymers (polyacrylic acid). 7,34 TPAOH is the most widely employed template for forming hierarchically hollow mesoporous ZSM-5 via a dissolution-recrystallization mechanism.…”

Section: Introductionmentioning

confidence: 99%