A bifunctional Zn/ZrO<sub>2</sub>–SAPO-34 catalyst for the conversion of syngas to lower olefins induced by metal promoters

Raveendra, G.; Mitta, Hari Shekar; Linglwar, Shrutika; Balla, putra kumar; Rajesh, Rajendiran; Ponnala, Bhanu Chander; Safdar, Muddasar; Perupogu, Vijayanand

doi:10.1039/d3nj00142c

Cited by 1 publication

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“…The methanol-to-aromatics (MTA) process, as an important non-petroleum conversion route to produce aromatics, is of great strategic significance for optimizing the utilization of carbon-containing resources such as coal, natural gas, and biomass and alleviating petroleum shortages [1,2]. In the MTA reaction process, it is generally believed that the methanol conversion route involves the dehydration of methanol on the catalyst, followed by the formation of olefins via a direct or indirect mechanism, and then further conversion of olefins to aromatics [3].…”

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confidence: 99%

The Effect of Water Co-Feeding on the Catalytic Performance of Zn/HZSM-5 in Ethylene Aromatization Reactions

Shao,

Feng,

et al. 2024

IJMS

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During the methanol-to-aromatics (MTA) process, a large amount of water is generated, while the influence and mechanism of water on the activity and selectivity of the light olefin aromatization reaction are still unclear. Therefore, a study was conducted to systematically investigate the effects of water on the reactivity and the product distribution in ethylene aromatization using infrared spectroscopy (IR), intelligent gravitation analyzer (IGA), and X-ray absorption fine structure (XAFS) characterizations. The results demonstrated that the presence of water reduced ethylene conversion and aromatic selectivity while increasing hydrogen selectivity at the same contact time. This indicated that water had an effect on the reaction pathway by promoting the dehydrogenation reaction and suppressing the hydrogen transfer reaction. A detailed analysis using linear combination fitting (LCF) of Zn K-edge X-ray absorption near-edge spectroscopy (XANES) on Zn/HZSM-5 catalysts showed significant variations in the state of existence and the distribution of Zn species on the deactivated catalysts, depending on different reaction atmospheres and water contents. The presence of water strongly hindered the conversion of ZnOH+ species, which served as the active centers for the dehydrogenation reaction, to ZnO on the catalyst. As a result, the dehydrogenation activity remained high in the presence of water. This study using IR and IGA techniques revealed that water on the Zn/HZSM-5 catalyst inhibited the adsorption of ethylene on the zeolite, resulting in a noticeable decrease in ethylene conversion and a decrease in aromatic selectivity. These findings contribute to a deeper understanding of the aromatization reaction process and provide data support for the design of efficient aromatization catalysts.

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Section: Introductionmentioning

confidence: 99%

The Effect of Water Co-Feeding on the Catalytic Performance of Zn/HZSM-5 in Ethylene Aromatization Reactions

Shao,

Feng,

et al. 2024

IJMS

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A bifunctional Zn/ZrO₂–SAPO-34 catalyst for the conversion of syngas to lower olefins induced by metal promoters

Abstract: Syngas (CO/H2) is selected as a non-petroleum carbon source and transformed into lower olefins (C2-C4=), aromatics (BTX), liquefied petroleum gas (LPG), and gasoline (C5-C11), respectively. CO-precipitation method is a used...

Cited by 1 publication

References 74 publications

The Effect of Water Co-Feeding on the Catalytic Performance of Zn/HZSM-5 in Ethylene Aromatization Reactions

The Effect of Water Co-Feeding on the Catalytic Performance of Zn/HZSM-5 in Ethylene Aromatization Reactions

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A bifunctional Zn/ZrO2–SAPO-34 catalyst for the conversion of syngas to lower olefins induced by metal promoters

Abstract: Syngas (CO/H2) is selected as a non-petroleum carbon source and transformed into lower olefins (C2-C4=), aromatics (BTX), liquefied petroleum gas (LPG), and gasoline (C5-C11), respectively. CO-precipitation method is a used...

Cited by 1 publication

References 74 publications

The Effect of Water Co-Feeding on the Catalytic Performance of Zn/HZSM-5 in Ethylene Aromatization Reactions

The Effect of Water Co-Feeding on the Catalytic Performance of Zn/HZSM-5 in Ethylene Aromatization Reactions

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A bifunctional Zn/ZrO₂–SAPO-34 catalyst for the conversion of syngas to lower olefins induced by metal promoters