Dehydrogenation of Propane to Propylene over Ga2O3Supported on Mesoporous HZSM‐5 in the Presence of CO2

Xie, Yuqing; Hua, Weiming; Yue, Yinghong; Gao, Zi

doi:10.1002/cjoc.201090265

Cited by 16 publications

(7 citation statements)

References 28 publications

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“…29 Hierarchical H-ZSM-5 has also been used as a support for impregnation of Ga 2 O 3 for oxidative dehydrogenation reactions. 30 The above reports are encouraging for the application of hierarchical zeolites to PDH and related reactions. In this work, we focus on direct incorporation of gallium (Ga) sites during the formation of silica MFI hierarchical zeolites.…”

Section: ■ Introductionmentioning

confidence: 78%

“…For example, hierarchical MFI (in the aluminosilicate form, ZSM-5) has been used as a support to impregnate PtSnNa catalysts with improved PDH conversion and selectivity and lower deactivation compared to bulk ZSM-5 supports . Hierarchical H-ZSM-5 has also been used as a support for impregnation of Ga 2 O 3 for oxidative dehydrogenation reactions . The above reports are encouraging for the application of hierarchical zeolites to PDH and related reactions.…”

Section: Introductionmentioning

confidence: 94%

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Hierarchical Ga-MFI Catalysts for Propane Dehydrogenation

Kim

Choi

et al. 2017

Chem. Mater.

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We report the synthesis, characterization, and enhanced propane dehydrogenation properties of hierarchical Ga-MFI zeolite catalysts synthesized by two different methods: (i) repetitive branching and (ii) utilization of a long chain alkyl SDA. Structural, compositional, and morphological characterizations confirm that the Ga-MFI catalyst materials have hierarchical structures including micropores and mesopores in a single particle and show that Si/Ga ratios comparable to bulk Ga-MFI catalysts can be obtained. Acid site analysis using NH 3 -TPD and pyridine adsorption followed by in situ IR spectroscopy allowed quantification of the number and types of acid sites present and show that the hierarchical catalysts have considerably higher Lewis acid site concentrations than the bulk catalysts. The hierarchical Ga-MFI catalysts show superior PDH performance (at 600 °C) compared to bulk Ga-MFI catalysts. Propane conversion rates are increased 2−6-fold and propylene selectivities are 10−100% higher. We also examine the effects of synthesis variationssuch as addition of 3-mercaptopropyltrimethoxysilane during synthesis and H + ion-exchangeand find that both these steps have a beneficial effect on PDH properties. Calculations suggest that PDH in both the bulk and the hierarchical Ga-MFI is not diffusion-limited. Therefore, the superior performance of hierarchical Ga-MFI is due to intrinsically higher activity and selectivity. Potential reasons for this behavior are outlined. The present findings showing enhancement of PDH in hierarchical Ga-MFI catalysts suggests that the utility of the hierarchical zeolites is not limited to diffusion-limited reactions involving large, bulky molecules and that they may be useful in more diverse applications involving gas-phase reactions with small molecules.

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Section: ■ Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 94%

Hierarchical Ga-MFI Catalysts for Propane Dehydrogenation

Kim

Choi

et al. 2017

Chem. Mater.

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“…On the one hand, for the intracrystalline mesopores, the average pore size is far less than the particle size of platinum and the Pt particles cannot enter these pores in the catalyst. However, according to the results of Yue' group, due to the better transport of the reactant and product molecules, the introduction of these intracrystalline mesopores in ZSM‐5 improves the catalytic activity as well as the stability of the catalyst. On the other hand, for the large pores on the surface of the catalyst, these pores are large enough to anchor the platinum particles inside.…”

Section: Resultsmentioning

confidence: 99%

The synthesis of new coke‐resistant support and its application in propane dehydrogenation to propene

Zhou

Zhang

et al. 2015

J of Chemical Tech & Biotech

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BACKGROUND: ZSM-5 zeolite has been used as a common support for PtSn-based catalyst in the propane dehydrogenation reaction. But owing to its high acidy, coke accommodation and stability of the catalyst are not satisfactory. Here, in order to improve the performance, the new hierarchical-porous ZSM-5 (abbreviated henceforth as ZQ) has been synthesized. RESULTS: By the introduction of hierarchical-pores in ZQ, the pore structure was changed, the acid content was decreased, and the surface properties were promoted. These modifications to zeolite greatly improved the capacity of catalysts to accommodate coke. Moreover, the coke deposit on PtSnNa/ZQ migrated from active metal to the support. As expected, by using the catalyst PtSnNa/ZQ, the catalytic performance of propane dehydrogenation to propene and the stability of the catalyst were significantly promoted. CONCLUSIONS:The new hierarchical-porous ZSM-5 support (ZQ) exhibits enhanced capacity to accommodate coke, and PtSnNa/ZQ enabled better propane conversion and improved catalyst stability.

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“…However, the negative effects of CO 2 addition and rapid deactivation have prevented Ga 2 O 3 catalysts from receiving more attention in the same group. Following this hint, various studies by Gao et al [68–73] . showed that β‐Ga 2 O 3 with unsaturated Ga 3+ cations and abundant strong acid sites on the surface was the main active species.…”

Section: Development Of Metal Oxides In Co2−odpmentioning

confidence: 93%

Metallic Catalysts for Oxidative Dehydrogenation of Propane Using CO₂

Xing

Furukawa

2022

Chemistry A European J

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The oxidative dehydrogenation of propane using CO2 (CO2−ODP) is a promising technique for realizing high‐yield propylene production and CO2 usage. Developing a highly efficient catalyst for CO2−ODP is essential and beneficial to the chemical industry and for realizing net‐zero emissions. Many studies have investigated metal oxide‐based catalysts, revealing that rapid deactivation and low selectivity remain limiting factors for their industrial applications. In recent years, metallic nanoparticle catalysts have become increasingly attractive due to their unique properties. Therefore, we summarize the performance of metal‐based catalysts in CO2−ODP reactions by considering catalyst design concepts, different mechanisms in the reaction process, and the role of CO2.

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Dehydrogenation of Propane to Propylene over Ga₂O₃Supported on Mesoporous HZSM‐5 in the Presence of CO₂

Cited by 16 publications

References 28 publications

Hierarchical Ga-MFI Catalysts for Propane Dehydrogenation

Hierarchical Ga-MFI Catalysts for Propane Dehydrogenation

The synthesis of new coke‐resistant support and its application in propane dehydrogenation to propene

Metallic Catalysts for Oxidative Dehydrogenation of Propane Using CO₂

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Dehydrogenation of Propane to Propylene over Ga2O3Supported on Mesoporous HZSM‐5 in the Presence of CO2

Cited by 16 publications

References 28 publications

Hierarchical Ga-MFI Catalysts for Propane Dehydrogenation

Hierarchical Ga-MFI Catalysts for Propane Dehydrogenation

The synthesis of new coke‐resistant support and its application in propane dehydrogenation to propene

Metallic Catalysts for Oxidative Dehydrogenation of Propane Using CO2

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Product

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Dehydrogenation of Propane to Propylene over Ga₂O₃Supported on Mesoporous HZSM‐5 in the Presence of CO₂

Metallic Catalysts for Oxidative Dehydrogenation of Propane Using CO₂