Triple-template system for phosphorus-modified AFX/CHA intergrowth zeolite

Tsuchiya, Kazuyoshi; Tsunoji, Nao; Sasaki, Yukichi; Uemura, M.; Onishi, Misae; Sadakane, Masahiro; Sano, Tsuneji

doi:10.1016/j.micromeso.2020.110540

Cited by 5 publications

(5 citation statements)

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“…In fact, most intergrowth zeolites are synthesized by optimizing or combining organic templating agents according to crystal pore structure and cage characteristics, usually including novel single templates (e.g., AEI/CHA, ZSM-48, , SSZ-36, etc.) and double (multiple) template pairings (e.g., AFX/CHA, , MTT/TON, MFI/MEL, etc.). Template-free synthesis of intergrowth zeolites has an additional attraction due to its simple preparation process, low cost, and avoidance of energy-intensive postsynthesis demolding treatment, which is of considerable significance in both practical industrial production and environmental management.…”

Section: Synthesis Of Intergrowth Zeolitesmentioning

confidence: 99%

“…Therefore, further understanding the structural characteristics of each intergrowth zeolite is crucial. For example, the kinetic diameters of reacting molecules are relatively small (>3.8 Å) for both NH 3 -SCR and MTO reactions, so small pore zeolites with 8 MR are chosen to hinder the entry of macromolecules allowing for a slower catalyst deactivation, such as AEI/CHA, AFX/CHA, and AFX/LEV . Importantly, none of these intergrowth phase boundaries create a barrier to mass transfer and they allow the molecules to complete their catalytic reactions in respective channel systems, with only concomitant differences in catalytic properties at the phase boundaries.…”

Section: Intergrowth Structure and Catalytic Activitymentioning

confidence: 99%

“…reported a triple-template system for phosphorus-modified AFX/CHA intergrowth zeolite (Figure 4). 37 In contrast to Yusuke's work, they used organophosphorus as a structural guide for the CHA phase while allowing in situ modification of phosphorus to increase the thermal stability of the intergrowth framework. Moreover, other OSDAs can be tailored with the assistance of molecular modeling, and it has been determined that 1-methyl-1-propylpiperidine and 1-butyl-1-methylpyrrolidine are effective for the preparation of the CHA/AFX zeolite.…”

Section: D Intergrowth Zeolitesmentioning

confidence: 99%

Section: Synthesis Of Intergrowth Zeolitesmentioning

confidence: 99%

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Intergrowth Zeolites, Synthesis, Characterization, and Catalysis

Wang,

Tong,

Liu

et al. 2023

Chem. Rev.

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Microporous zeolites that can act as heterogeneous catalysts have continued to attract a great deal of academic and industrial interest, but current progress in their synthesis and application is restricted to single-phase zeolites, severely underestimating the potential of intergrowth frameworks. Compared with single-phase zeolites, intergrowth zeolites possess unique properties, such as different diffusion pathways and molecular confinement, or special crystalline pore environments for binding metal active sites. This review first focuses on the structural features and synthetic details of all the intergrowth zeolites, especially providing some insightful discussion of several potential frameworks. Subsequently, characterization methods for intergrowth zeolites are introduced, and highlighting fundamental features of these crystals. Then, the applications of intergrowth zeolites in several of the most active areas of catalysis are presented, including selective catalytic reduction of NOx by ammonia (NH 3 -SCR), methanol to olefins (MTO), petrochemicals and refining, fine chemicals production, and biomass conversion on Beta, and the relationship between structure and catalytic activity was profiled from the perspective of intergrowth grain boundary structure. Finally, the synthesis, characterization, and catalysis of intergrowth zeolites are summarized in a comprehensive discussion, and a brief outlook on the current challenges and future directions of intergrowth zeolites is indicated.

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Section: Synthesis Of Intergrowth Zeolitesmentioning

confidence: 99%

Section: Intergrowth Structure and Catalytic Activitymentioning

confidence: 99%

Section: D Intergrowth Zeolitesmentioning

confidence: 99%

Section: Synthesis Of Intergrowth Zeolitesmentioning

confidence: 99%

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Intergrowth Zeolites, Synthesis, Characterization, and Catalysis

Wang,

Tong,

Liu

et al. 2023

Chem. Rev.

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“…Zhang et al ( 2021b ) reported greater catalytic activity, hydrothermal stability, and sulfur aging resistance for a Cu/SAPO-18/34 intergrown zeolite catalyst compared to those for Cu/SAPO-18 and Cu/SAPO-34. As a typical representative, SAPO-18/34 zeolite is a new type of zeolite ( Boruntea et al, 2019 ; Tsuchiya et al, 2020 ; Li et al, 2022b ) composed of AEI and CHA skeleton structure units in stacking faults. It has both the pore canals and acidity of the two crystal phase structures, which usually show better catalytic performance than a single zeolite.…”

Section: Introductionmentioning

confidence: 99%

The investigation of the NH3-SCR performance of a copper-based AEI-CHA intergrown zeolite catalyst

Ren

Wang

et al. 2022

Front. Chem.

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This work prepared an ISAPO-34/SAPO-18 intergrown zeolite using phosphate organoamine as the structure guiding agent. Physical-chemical characterizations by XRD, SEM, TG, and BET showed that the SAPO-34/SAPO-18 presents a cross-stacked cubic block-like microscopic morphology, with characteristic diffusive diffraction peaks at 2θ = 16–18° and 30–33° and a specific surface area of 557 m2 g−1. The series of copper-based catalysts prepared from SAPO-34/SAPO-18 showed a shift of the active temperature window to a lower temperature with increasing copper content. Moreover, the Brønsted acid site decreased significantly due to copper ion exchange and zeolite structure framework damage. Among them, the 1.2 wt% sample showed the widest active temperature window, with a T90 range of 175–435°C. After low-temperature hydrothermal aging treatment, the zeolite structure was eroded and the catalyst activity deteriorated significantly.

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