Hierarchical Zeolite Single-Crystal Reactor for Excellent Catalytic Efficiency

Sun, Minghui; Zhou, Jian; Hu, Zhi‐Yi; Chen, Lihua; Li, Li-Yuan; Wang, Yangdong; Xie, Zaiku; Turner, Stuart; Tendeloo, Gustaaf Van; Hasan, Tawfique; Su, Bao‐Lian

doi:10.1016/j.matt.2020.07.016

Cited by 85 publications

(61 citation statements)

References 57 publications

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“…The synthesis is flexible in terms of zeolite topology and Si/Al‐ratio and the additional porosity can be tuned effectively by using different OCCMs. [ 15,16 ] However the use of OCCMs represents also a drawback since the preparation of the OCCM is a complicated multistep process and thus rather expensive which makes this method less attractive for large‐scale production of zeolites with macropores.…”

Section: Preparation Methods For Hierarchically Structured Zeolites With Macroporesmentioning

confidence: 99%

Preparation and Potential Catalytic Applications of Hierarchically Structured Zeolites with Macropores

Weissenberger

Machoke

Reiprich

et al. 2021

Adv Materials Inter

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Hierarchically structured zeolites can mitigate problems arising from the slow transport in the micropores, such as diffusion limitations. Hence, a manifold of different preparation methods for hierarchical zeolites have been developed over the years and the corresponding zeolites showed superior performance due to enhanced mass transport caused by higher diffusivities in the additional pore system and reduced diffusion path length in the micropores. The dimensions of the additional secondary “transport” pores in these materials is a major factor affecting their diffusion properties and consequently their catalytic performance. Interestingly almost all reports focus on the generation of additional mesopores and study of catalytic performance of mesoporous zeolites. Larger macropores with pore diameters of more than 50 nm, however, have some intrinsic advantages over mesopores that make them very attractive for catalytic applications. In the last years, methods for the preparation of zeolites and zeolite composites with additional macropores have been developed. These developments have brought about a novel and promising class of hierarchically structured materials; zeolites with macropores. This review gives an overview about different preparation routes for zeolites with inter or intra crystalline macropores as well as zeolite composites with macropores and summarizes the first studies regarding catalytic their performance.

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Section: Preparation Methods For Hierarchically Structured Zeolites With Macroporesmentioning

confidence: 99%

Preparation and Potential Catalytic Applications of Hierarchically Structured Zeolites with Macropores

Weissenberger

Machoke

Reiprich

et al. 2021

Adv Materials Inter

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show abstract

“…Porous hierarchy: having bimodal or multimodal porous structures with a pore size distribution from micro-, meso- to macropores in a single body enables fast mass-transport and high contact surface area for highly efficient exchange and reactions (e.g. diatom and artificial hierarchically porous zeolite single crystals [ 2 ]). Morphological hierarchy: having multi-level microstructure units with specific morphologies enables the collaborative coupling of functions (e.g.…”

Section: Hierarchy In Materialsmentioning

confidence: 99%

Hierarchy in materials for maximized efficiency

Chen

2020

National Science Review

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“…The first to be mentioned is the work on micron-sized zeolite single crystals featuring hierarchical intracrystal interconnected ordered macro-meso-microporosity made by Su's group, the pioneers of the field, which is considered as one of the most important milestones of the field [ 3 , 10 , 11 ]. It is well known that as a size- and shape-selective catalyst, zeolites are widely used in petroleum and fine chemicals processing.…”

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confidence: 99%

“…Such unique hierarchically porous architecture within one single zeolite crystal with high thermal and hydrothermal stability and excellent mechanic strength can maximize the rate of intracrystalline diffusion of reactants and products, the accessibility to active sites and thus the catalytic efficiency of each of the zeolite single crystals. This leads to a significant reduction in coking and deactivation rate, outstanding catalytic activity and selectivity, and highly improved catalyst lifetime in methanol-to-olefins [ 10 ], bulky molecules cracking [ 10 , 11 ] and Friedel-Crafts alkylation of benzene with benzyl alcohol [ 11 ] reactions. Their in situ bottom-up confined crystallization strategy with regard to the hierarchically porous zeolite single crystal is highly universal and has been extended to the successful synthesis of other zeolitic materials, including ZSM-5, Beta, TS-1 and SAPO-34.…”

mentioning

confidence: 99%