Verifying the olefin formation mechanism of the methanol-to-hydrocarbons reaction over H-ZSM-48

Zhang, Jie; Huang, Zhihua; Xu, Lei-Luo; Zhang, Xiaomin; Zhang, Xinzhi; Yuan, Yangyang; Xu, Lei

doi:10.1039/c8cy02621a

Cited by 19 publications

(25 citation statements)

References 73 publications

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“…At higher reaction temperatures, the methylation of oligomers and further cracking to light olefins are presumed to be promoted [49], easily leading to higher selectivity of ethylene and propylene. However, further raising the reaction temperature to 773 K, the selectivity of propylene dropped to 57.2%, and the ethylene and aromatics selectivity increased to 10.8% and 6.5%, respectively, probably due to the enhancement of aromatics-based cycle at high temperature (> 723 K) according to the similar results reported by Xu et al [50]. Fig.…”

Section: Effects Of Reaction Parameters and Hydrothermal Treatment On The Mtp Catalytic Performance Over M-200(274)supporting

confidence: 84%

Selective conversion of methanol to propylene over highly dealuminated mordenite: Al location and crystal morphology effects

Ren

Wang

et al. 2021

Chinese Journal of Catalysis

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Section: Effects Of Reaction Parameters and Hydrothermal Treatment On The Mtp Catalytic Performance Over M-200(274)supporting

confidence: 84%

Selective conversion of methanol to propylene over highly dealuminated mordenite: Al location and crystal morphology effects

Ren

Wang

et al. 2021

Chinese Journal of Catalysis

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“…[ 130 ] In contrast, medium‐pore zeolites with 10‐MR pore openings, such as ZSM‐5 ( MFI ) and ZSM‐48 (* MRE ), offer less stringent space limitation and favor increased selectivity toward propylene. [ 49h,131 ] Large‐pore zeolites with 12‐MR pore openings, such as Beta zeolites, generally induce the formation of heavier hydrocarbons. This is mainly because the aromatic‐mediated mechanism dominates during the MTO reaction due to the lack of a spatial confinement effect within 12‐MR channel systems.…”

Section: Ch3oh Conversion Over Zeolite‐based Catalystsmentioning

confidence: 99%

Applications of Zeolites to C1 Chemistry: Recent Advances, Challenges, and Opportunities

2020

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However, due to growing concerns regarding crude oil depletion and increasing environmental requirements, finding abundant fossil hydrocarbons with high H 2 /C ratios as well as alternative carbon resources has become crucial to maintaining sustainable, environmentally benign systems that can aid human development. [2] Thus, one-carbon (C1) chemistry, which is the chemistry of C1 molecules that can be derived from sources other than fossil hydrocarbons, including carbon monoxide (CO), carbon dioxide (CO 2), methane (CH 4), methanol (CH 3 OH), and formic acid (HCOOH), has emerged and plays important roles in the energy supply and high-value chemical preparation. [1,3] These C1 resources can be obtained from natural gas, shale gas, coal, biomass, solid wastes, and CO 2 emissions. [3a,4] Extensive studies have been dedicated to the catalytic conversion of C1 molecules, including production of dimethyl ether (DME) and liquid fuels from syngas (a mixture of CO and H 2); production of methanol, light olefins, and even aromatics from CH 4 ; and production of hydrogen from HCOOH. [5] All of these transformations require metallic catalytic species such as single atoms; clusters; or oxides, carbides, or alloy particles (e.g., Rh-, AuPd-, Fe 3 O 4-, and Fe 5 C 2-based catalysts). However, these isolated metallic species suffer from severe sintering due to a lack of confinement effects from supports, which leads to poor catalytic stability and decreased selectivities toward their target products. The efficient production of a specific range of hydrocarbons or oxygenates remains a difficult scientific and technical challenge. Overcoming product selectivity limitations and improving catalyst stabilities via catalyst designs are important areas of research. Zeolites are an important class of shape-selective catalysts with uniform micropores, tunable acidities, and high thermal and hydrothermal stabilities. Over the past decade, they have gained broad popularity and been applied to various industrially important catalytic processes. [6] In particular, the design and development of zeolite-based mono-, bi-, and multifunctional catalysts that combine the advantages of zeolites with those of metallic catalytic species have boosted the application of zeolites to C1 chemistry. As shown in Figure 1, value-added hydrocarbons and oxygenates can be produced from C1 molecules via various catalytic routes over zeolite-based catalysts. By May of 2020, the Structure Commission of the International C1 chemistry, which is the catalytic transformation of C1 molecules including CO, CO 2 , CH 4 , CH 3 OH, and HCOOH, plays an important role in providing energy and chemical supplies while meeting environmental requirements. Zeolites are highly efficient solid catalysts used in the chemical industry. The design and development of zeolite-based mono-, bi-, and multifunctional catalysts has led to a booming application of zeolite-based catalysts to C1 chemistry. Combining the advantages of zeolites and metallic catalytic species has promoted the catal...

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“…Metal/nonmetal doping is generally used to adjust the band edge to extend its visible-light response [14][15][16]. Heterogeneous or homogeneous cocatalysts are employed to improve its interfacial charge transfer [17][18][19][20]. Meanwhile, structural defects extremely limit the electron-hole separation and transport [21,22].…”

Section: Introductionmentioning

confidence: 99%

3D macropore carbon-vacancy g-C3N4 constructed using polymethylmethacrylate spheres for enhanced photocatalytic H2 evolution and CO2 reduction

Wang

Gan

et al. 2021

Journal of Energy Chemistry

118

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Verifying the olefin formation mechanism of the methanol-to-hydrocarbons reaction over H-ZSM-48

Abstract: The product distributions and catalytic cycle of the methanol-to-hydrocarbons reaction over H-ZSM-48 zeolite can be altered by changing the reaction temperature.

Cited by 19 publications

References 73 publications

Selective conversion of methanol to propylene over highly dealuminated mordenite: Al location and crystal morphology effects

Selective conversion of methanol to propylene over highly dealuminated mordenite: Al location and crystal morphology effects

Applications of Zeolites to C1 Chemistry: Recent Advances, Challenges, and Opportunities

3D macropore carbon-vacancy g-C3N4 constructed using polymethylmethacrylate spheres for enhanced photocatalytic H2 evolution and CO2 reduction

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