The Known and Overlooked Sides of Zeolite‐Extrudate Catalysts

Yang, Ke‐Fang; Zhang, Dazhi; Zou, Mingming; Yu, Lili; Huang, Sheng-Jun

doi:10.1002/cctc.202001601

Cited by 23 publications

(28 citation statements)

References 62 publications

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“…This corresponds to a 60% mesopore surface area increase between the first and the last sample. In line with previous observations, − the slight drop in S meso observed over HBs-05 and HBs-10 is likely due to the presence of the binder blocking the surface of the catalyst. The increase in mesoporosity is obviously observed by the pore volume data because V meso changes from 0.11 in HB to 0.18 m 2 g –1 in HBs-20, in accordance with ca.…”

Section: Results and Discussionsupporting

confidence: 92%

“…Thus, in practical application, structured zeolites (i.e., extrudates, pellets, monoliths, and granules) with sufficient mechanical strength are necessary, and this is done by adding binders (usually 30–50 wt %). − A few synthetic routes have been proposed to shape zeolite powders into technical form. , Unfortunately, the presence of binders in massive quantity end up covering the surface of the zeolites, blocking the channels and pores, and leading to additional diffusional limitation. This significantly affects the zeolite acidity, and generally has a negative impact on the catalytic performance, especially for acid-catalyzed reactions. − …”

Section: Introductionmentioning

confidence: 99%

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Structured Binder-Free Al-β Zeolite for Acid-Catalyzed Dehydration

Liu

Zhang

et al. 2021

ACS Appl. Nano Mater.

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It has long remained a challenge in catalysis to synthesize technical hierarchical nanosized zeolites without growth modifiers and binders. Herein, we report a facile synthetic route to directly prepare binderless hierarchical Al-β zeolite in shaped form, with retained acidity, and sufficient mechanical strengths. The preparation process consists of two steps, where an Al-β zeolite nanopowder is first shaped using tetraethyl orthosilicate; the extrudate is then recrystallized under hydrothermal conditions with the assistance of tetraethylammonium hydroxide (TEAOH) solution. The alkaline environment leads to mesopores into the zeolite, and transforms as well the SiO 2 binders into a zeolite framework. Several characterization methods were performed to reveal the structure−property relationships of the materials in powdered and shaped form. It was found that the process of TEAOH treatment is the combination of desilication, mesopore formation, and binder recrystallization to give zeolite Al-β nanoparticles, resulting in the obvious increase in microporosity, acidity, and X-ray diffraction crystallinity of samples. Density functional theory calculations were also used to rationalize the recrystallization process. Finally, the utility of the materials was demonstrated by evaluating their catalytic properties in the dehydration of 2-(4-ethylbenzoyl)benzoic acid, a reaction which is traditionally catalyzed by concentrated sulfuric acid and oleum. We found that the catalyst in technical form exhibits better catalytic performance than the powdered HB nanoparticles and higher product yield than traditional (homogeneous) catalysts.

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Section: Results and Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Structured Binder-Free Al-β Zeolite for Acid-Catalyzed Dehydration

Liu

Zhang

et al. 2021

ACS Appl. Nano Mater.

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show abstract

“…47,65,66 On the other hand, a powdery zeolite catalyst has to be shaped with a porous binder (silica or alumina) to enhance the mechanical strength and avoid pressure drops in applications. [67][68][69] Therefore, the spatial organization of functional components can be quite different even if the composition is the same for bifunctional catalysts. To evaluate the proximity effect, the distance between Pt-Zn NPs and acid sites was intentionally controlled from a millimeter-scale to an atomic-scale (Fig.…”

Section: Catalysis Science and Technology Papermentioning

confidence: 99%

Boosting propane dehydroaromatization by confining PtZn alloy nanoparticles within H-ZSM-5 crystals

Chen

Zhang

et al. 2022

Catal. Sci. Technol.

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“…and many other additives. [71,72] Notably, shaping is also often undertaken in the case of supported metal catalysts before practical use, as illustrated in figure 1-b.…”

Section: Understanding the Nature Of The Surface Active Sitesmentioning

confidence: 99%

Achievements and Expectations in the Field of Computational Heterogeneous Catalysis in an Innovation Context

Chizallet

2021

Top Catal

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Heterogeneous catalysis is linked to industrial considerations from its origins, so is computational heterogeneous catalysis. The impact of first principles calculations on discoveries made for industrially relevant systems is growing year after year. In an innovation context, key questions are related to active site structure understanding, chemical reactivity investigations, multi-scale modeling, and prediction of new active phases with optimal catalytic performance. The present short review discusses and illustrates these various stages of the catalyst understanding and performance prediction where computational catalysis has a crucial role to play. Selected achievements in the field are reviewed, with a focus on the simulation of complex metallic and zeolite catalysts of industrial relevance. Future directions are suggested, on the basis of the need for ever more exhaustive and accurate models of catalytic sites and catalytic reactions representative of industrial systems, and for speed up in catalyst understanding and discovery.

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The Known and Overlooked Sides of Zeolite‐Extrudate Catalysts

Cited by 23 publications

References 62 publications

Structured Binder-Free Al-β Zeolite for Acid-Catalyzed Dehydration

Structured Binder-Free Al-β Zeolite for Acid-Catalyzed Dehydration

Boosting propane dehydroaromatization by confining PtZn alloy nanoparticles within H-ZSM-5 crystals

Achievements and Expectations in the Field of Computational Heterogeneous Catalysis in an Innovation Context

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