Synthesis, characterization, and catalytic application of hierarchical SAPO-34 zeolite with three-dimensionally ordered mesoporous-imprinted structure

Wang, Jing; Yang, Mingsheng; Shang, Wenjin; Su, Xiaoping; Hao, Qingqing; Chen, Huiyong; Ma, Xiaoxun

doi:10.1016/j.micromeso.2017.06.012

Cited by 35 publications

(15 citation statements)

References 48 publications

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“…In the reaction of MTO, its catalytic life is greatly improved. Wang et al [82] used three-dimensional or- Chemistry-A European Journal dered mesoporous carbon as a hard template and used the restricted domain growth method to prepare ordered hierarchical porous SAPO-34 molecular sieves with adjustable pore size. The mesoporous pore size of the molecular sieve can be adjusted between 5.5 and 13.0 nm, and the number of strong acid centers is reduced.…”

Section: Chemistry-a European Journalmentioning

confidence: 99%

Synthesis and Applications of SAPO‐34 Molecular Sieves

Cheng

et al. 2021

Chemistry A European J

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Silicoaluminophosphate zeolite (SAPO‐34) has been attracting increasing attention due to its excellent form selection and controllability in the chemical industry, as well as being one of the best industrial catalysts for methanol‐to‐olefin (MTO) reaction conversion. However, as a microporous molecular sieve, SAPO‐34 easily generates carbon deposition and rapidly becomes inactivated. Therefore, it is necessary to reduce the crystal size of the zeolite or to introduce secondary macropores into the zeolite crystal to form a hierarchical structure in order to improve the catalytic effect. In this review, the synthesis methods of conventional SAPO‐34 molecular sieves, hierarchical SAPO‐34 molecular sieves and nanosized SAPO‐34 molecular sieves are introduced, and the properties of the synthesized SAPO‐34 molecular sieves are described, including the phase, morphology, pore structure, acid source, and catalytic performance, in particular with respect to the synthesis of hierarchical SAPO‐34 molecular sieves. We hope that the review can provide guidance to the preparation of the SAPO‐34 catalysts, and stimulate the future development of high‐performance hierarchical SAPO‐34 catalysts to meet the growing demands of the material and chemical industries.

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Section: Chemistry-a European Journalmentioning

confidence: 99%

Synthesis and Applications of SAPO‐34 Molecular Sieves

Cheng

et al. 2021

Chemistry A European J

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“…[1][2] Over the past decades, thorough studies have been conducted on the activity of SAPO materials in many catalytic reactions, and these kind of molecular sieves are very promising due to their high selectivity towards desired products as well as long catalytic lifetime. [3][4][5][6][7] In spite of these excellent properties, in some cases, the comparatively small micropores in SAPO molecular sieves influence the mass transfer of the reactants and products away from the active sites, resulting in easy coke formation and then limits their performance in industrial applications. [8,9] Hence, the modification of the materials to enhance the activity and selectivity still remains a key challenge in advanced catalysis research.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hierarchical Silicoaluminophosphate (SAPO) Molecular Sieves by Post‐Synthetic Modification and Their Catalytic Application

et al. 2022

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Silicoaluminophosphates SAPO-34 (CHA topology) and SAPO-5 (AFI topology) molecular sieves are selectively prepared by hydrothermal method using templates tetraethylammonium hydroxide and triethylamine, respectively and suitably modified. Hierarchical SAPO-34 & SAPO-5 catalysts were post-synthetically prepared by facile acid (HNO 3 and HCl) and base (NaOH) etching. X-ray diffraction (XRD), Thermogravimetric analysis (TG), FT-IR and Scanning Electron Microscope (SEM) were employed to investigate structural changes of the molecular sieves. Hierarchical SAPO-34 & SAPO-5 were used for the ring opening reaction of propylene oxide with morpholine producing the corresponding β-amino alcohols, and catalytic activity of the acid-treated SAPO-34 & SAPO-5 was compared with that of alkali treated counterparts. The catalytic performance of the acid treated materials was found better than the base treated one. 91 % conversion was achieved using acid treated SAPO-34, whereas 74 % conversion was achieved using alkali treated SAPO-34.

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“…Notably, the hardtemplate method was proven to create ordered mesoporous structures and precisely control mesopore size. Wang et al [35] applied three-dimensionally ordered mesoporous carbon (20, 40 and 80 nm) as a template to obtain hierarchical SAPO-34 zeolites with a three-dimensionally ordered mesoporous-imprinted structure, and the ordered mesopore size could be tuned from 5.5 to 13.0 nm by varying the size of the three-dimensionally ordered carbon (from 20 to 80 nm). Based on the generalized Murray's law on the design of suitable pore size, our group designed an in-situ crystallization approach for constructing hierarchical single-crystal MFI zeolites by using ordered mesoporous carbon-silica composite as a hard template.…”

Section: Introductionmentioning

confidence: 99%

The effect of hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios on its pore structure and catalytic performance

Hou

Sun

et al. 2020

Front. Chem. Sci. Eng.

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Hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios (Hier-ZSM-5-x, where x = 50, 100, 150 and 200) were synthesized using an ordered mesoporous carbon-silica composite as hard template. Hier-ZSM-5-x exhibits improved mass transport properties, excellent mechanical and hydrothermal stability, and higher catalytic activity than commercial bulk zeolites in the benzyl alcohol self-etherification reaction. Results show that a decrease in the Si/Al ratio in hierarchical single-crystal ZSM-5 zeolites leads to a significant increase in the acidity and the density of micropores, which increases the final catalytic conversion. The effect of porous hierarchy on the diffusion of active sites and the final catalytic activity was also studied by comparing the catalytic conversion after selectively designed poisoned acid sites. These poisoned Hier-ZSM-5-x shows much higher catalytic conversion than the poisoned commercial ZSM-5 zeolite, which indicates that the numerous intracrystalline mesopores significantly reduce the diffusion path of the reactant, leading to the faster diffusion inside the zeolite to contact with the acid sites in the micropores predominating in ZSM-5 zeolites. This study can be extended to develop a series of hierarchical single-crystal zeolites with expected catalytic performance.

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Synthesis, characterization, and catalytic application of hierarchical SAPO-34 zeolite with three-dimensionally ordered mesoporous-imprinted structure

Cited by 35 publications

References 48 publications

Synthesis and Applications of SAPO‐34 Molecular Sieves

Synthesis and Applications of SAPO‐34 Molecular Sieves

Synthesis of Hierarchical Silicoaluminophosphate (SAPO) Molecular Sieves by Post‐Synthetic Modification and Their Catalytic Application

The effect of hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios on its pore structure and catalytic performance

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