The synthesis of SAPO-34 zeolite for an improved MTO performance: tuning the particle size and an insight into the formation mechanism

Zhou, Yachuan; Shi, Huaizhong; Wang, Bolun; Chen, Guangrui; Yi, Jian; Li, Jiyang

doi:10.1039/d1qi00016k

Cited by 19 publications

(20 citation statements)

References 36 publications

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“…In fact, the different sources of Si, P and Al, crystallization time, or crystallization temperature both play an important role in hydrothermal synthesis. But in the latest study, Zhou et al [43] believe that silicon is not a vital factor in the crystallization of SAPO-34 in the concentrated gel system. The crystallization process of SAPO-34 may be that aluminum and phosphorus first form an aluminophosphate framework in the concentrated gel system, and then silicon gradually enters the framework to replace aluminum and phosphorus.…”

Section: Chemistry-a European Journalmentioning

confidence: 98%

Section: Synthesis and Influencing Factors Of Conventional Sapo‐34 Mo...mentioning

confidence: 99%

“…obtained SAPO‐34 with a particle size of 160–550 nm through a two‐step crystallization synthesis method. Zhou et al [43] . used two‐step crystallization in the concentrated gel system is to control the particle size in the range of 0.9–1.2 μm.…”

Section: Synthesis and Influencing Factors Of Conventional Sapo‐34 Mo...mentioning

confidence: 99%

“…Pengfei Wang et al [51] obtained SAPO-34 with a particle size of 160-550 nm through a two-step crystallization synthesis method. Zhou et al [43] used two-step crystallization in the concentrated gel system is to control the particle size in the range of 0.9-1.2 μm. The MTO catalysis shows that the as-synthesized SAPO-34 plates exhibit enhanced catalytic performance.…”

Section: Two-step Crystallizationmentioning

confidence: 99%

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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: 98%

Section: Synthesis and Influencing Factors Of Conventional Sapo‐34 Mo...mentioning

confidence: 99%

Section: Synthesis and Influencing Factors Of Conventional Sapo‐34 Mo...mentioning

confidence: 99%

Section: Two-step Crystallizationmentioning

confidence: 99%

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Synthesis and Applications of SAPO‐34 Molecular Sieves

Cheng

et al. 2021

Chemistry A European J

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“…polyhedral metal oxide clusters) are interconnected to form Å-nm sized pores, potentially containing catalytically relevant guest species. SAPO-34 is a microporous zeolite catalyst widely used for the methanol to olefins process and the selective reduction of NOx with NH3 [74]. For both processes, SAPO-34 is pre-treated under hydrothermal conditions which has a significant effect on its structure as revealed by in situ ss-NMR and PDF [69].…”

Section: Pdf Of Supported Nanoparticles Catalysts -When Differences M...mentioning

confidence: 99%

Uncovering the Structure of Heterogeneous Catalysts Using Atomic Pair Distribution Function Analysis

Zimmerli

Müller

Abdala

2022

Preprint

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Heterogeneous catalysts are complex materials, often containing multiple atomic species and phases with various degrees of structural order. The identification of structure – performance relationships that rely on the availability of advanced structural characterization tools, is key for a rational catalyst design. Structural descriptors in catalysts can be defined over different length scales from several Å up to several nanometers (crystalline structure), requiring structural characterization techniques covering these different length scales. Pair distribution function (PDF) analysis is a powerful method to extract structural information spanning from the atomic to the nanoscale under in situ or operando conditions. We discuss recent advances using PDF to provide insight into the atomic-to-nanoscale structure of heterogeneous catalysts.

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High‐Yield Synthesis of Hierarchical SAPO‐34 by Recrystallization Method for Efficient Methanol‐to‐Olefin Reactions

Wu,

Zhang,

Shi

et al. 2024

Chemistry An Asian Journal

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Prolonging the lifetime of SAPO‐34 catalysts and enhancing their olefin selectivity in methanol‐to‐olefin (MTO) reactions are critical yet challenging objectives. Here, a series of hierarchical SAPO‐34 catalysts were synthesized using a straightforward recrystallization method. The incorporation of triethylamine into the recrystallization mother liquor facilitated the formation of mesopores, achieving a high solid yield of up to 90%. Notably, the addition of phosphoric acid and ammonium polyvinyl phosphate alcohol during the recrystallization process significantly enhanced the crystallinity and regularity of the hierarchical SAPO‐34 crystals, consequently increasing the mesopore size. Due to the substantially improved mass transfer efficiency and moderated acidity, the SP34‐0.14P‐0.06R catalysts exhibited a prolonged operational life of 344 min and 80.3% selectivity of ethylene and propylene at a WHSV of 2h‐1. This performance markedly surpasses that of the parent SP34 catalyst, which demonstrated a lifetime of 136 min and a selectivity of 78.0%. Remarkably, the SP34‐0.14P‐0.06R maintained a lifetime of 166 minutes even at a high WHSV of 10h‐1, which is more than 5‐fold greater than that of the original microporous SP34. This research offers valuable insights into the design and development of hierarchically porous zeolites with high yields, enhancing the efficiency of MTO reactions and other applications.

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The synthesis of SAPO-34 zeolite for an improved MTO performance: tuning the particle size and an insight into the formation mechanism

Abstract: Traditional SAPO-34 zeolites synthesized by using trimethylamine (TEA) as organic templates have relatively large crystal size and limited MTO performance. In this work, SAPO-34 plates have been successfully synthesized by...

Cited by 19 publications

References 36 publications

Synthesis and Applications of SAPO‐34 Molecular Sieves

Synthesis and Applications of SAPO‐34 Molecular Sieves

Uncovering the Structure of Heterogeneous Catalysts Using Atomic Pair Distribution Function Analysis

High‐Yield Synthesis of Hierarchical SAPO‐34 by Recrystallization Method for Efficient Methanol‐to‐Olefin Reactions

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