Implanting Copper−Zinc Nanoparticles into the Matrix of Mesoporous Alumina as a Highly Selective Bifunctional Catalyst for Direct Synthesis of Dimethyl Ether from Syngas

Sun, Yingqi; Zhao, Zhongkui

doi:10.1002/cctc.201902166

Cited by 8 publications

(5 citation statements)

References 44 publications

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“…This work not only presents highly selective bifunctional catalyst for syngas-to-DME, but also opens up a simple method for designing other bifunctional catalysts for diverse consecutive reactions. [104] In combination of closed structure and the acidic sites of Al 2 O 3 , the relatively high selectivity in terms of direct synthesis of DME from syngas has been achieved. However, although the increasing amount of acidic sites of Al 2 O 3 led by high-temperature heating, the selectivity remains to be improved owing to insufficient acidic sites.…”

Section: Reactionmentioning

confidence: 99%

Catalytic Conversion of Carbon Oxides in Confined Spaces: Status and Prospects

Zhao

2020

ChemCatChem

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Owing to the depletion of fossil reserves and the global warming by released greenhouse gas from the consumption of fossil resources, the catalytic conversion of carbon oxide (COx, including CO2 and CO) into fuels and high‐value chemicals has attracted tremendous interest in the field of catalysis. Developing high‐performance and practical catalysts with high activity, selectivity, and stability is of great importance but remains a huge challenge. A variety of new strategies were developed to take advantage of confinement effect to address the challenges that are relevant to the highly‐efficient transformation and utilization of COx by performing catalytic reactions in a confined space. The status on this issue can be divided into three aspects: improvement in catalytic activity, increase in catalytic selectivity and enhancement in catalytic stability. In this review, the progress in the field of promoted catalytic conversion of COx in confined spaces will be presented and discussed. Especially, the specific promoting mechanism in terms of the confinement effect for COx‐related transformations in confined spaces and the relationship between the impact of the confined space on the catalytic activity, selectivity, and stability regarding of COx conversions are highlighted. Finally, the future prospects on the opportunities and challenges of catalytic conversion of COx in confined spaces are outlined.

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Section: Reactionmentioning

confidence: 99%

Catalytic Conversion of Carbon Oxides in Confined Spaces: Status and Prospects

Zhao

2020

ChemCatChem

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“…From a materials chemistry’s viewpoint, the above-prepared catalysts serve mainly as a proof-of-concept of the material system for demonstrating that it is feasible to convert CO 2 to light hydrocarbons by integrating different catalytically active metal components into one single material system. For instance, CuZn nanoparticles embedded within the catalyst structure are able to convert CO 2 to various C 1 products like CO, CH 4 , and methanol, − while the hollow ZSM-5 shell is active for converting methanol to a large variety of hydrocarbons from C 1 to C 5+ . , Further addition of Pt apparently complicates the situation, as it is well known for its wide-ranging catalytic activity such as CO 2 hydrogenation to CO and CH 4 and methanol decomposition to CO and H 2 . − Acknowledging the complexity of CO 2 hydrogenation reactions, we believe that it is inadequate to propose a defined reaction pathway leading to the observed product distribution at this point of time. Herein, instead, we can view the versatility of compositional and structural controls for our catalyst devices as a future research opportunity.…”

Section: Results and Discussionmentioning

confidence: 99%

Versatile Hollow ZSM-5 Nanoreactors Loaded with Tailorable Metal Catalysts for Selective Hydrogenation Reactions

Kwok

Zeng

2021

ACS Appl. Mater. Interfaces

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Zeolites are one of the most commonly used materials in the chemical industry, acting as catalysts or catalyst supports in different applications. Recently, the synthesis and functionalization of hollow zeolites have attracted many research interests, owing to the unique advantages of their hollow morphology. In the development of more sustainable processes, the hollow zeolites are often endowed with additional stability, selectivity, and activity. Herein, we present a stepwise synthetic protocol to prepare a range of complex hollow ZSM-5 catalysts with catalytic nanoparticles. Solid ZSM-5 crystals were first synthesized from Stöber silica spheres. This solid ZSM-5 sample was then loaded with transition metals via the impregnation method. A subsequent hollowing process was carried out in hydrothermal conditions in which hollow ZSM-5 crystals with confined transition metals inside were synthesized. More specifically, after the encapsulation of transition metals inside hollow ZSM-5, two different approaches have been further devised to allow the deposition of noble metals into the interior cavities or onto the exterior surfaces of the hollow ZSM-5. The deposition of Pt on the exterior surface was carried out by mixing the hollow ZSM-5 sample with presynthesized Pt nanoparticles. Loading of Pd in the interior was achieved by the galvanic replacement reaction between the Pd ions and embedded transition metals inside the hollow ZSM-5 sample. The catalytic performance of these reactor-like nanocatalysts has been evaluated with hydrogenation reactions in both liquid and gas phases, and their compositional and structural merits have been illustrated. For the hollow ZSM-5 sample with Pd loaded inside, liquid-phase selective hydrogenation of styrene over 4-vinylbiphenyl has been achieved with the ZSM-5 shell acting as a molecular sieve. The deposition of Pt on the exterior has improved the C2–C4 product yield when tested for the gas-phase CO2 hydrogenation reaction.

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“…Here, syngas is initially transformed into methanol, which is then converted to DME and the dehydration of which produces olefin products. The latter materials (i. e., olefins) could be successfully hydrogenated with the aid of metallic catalysts and are thus converted into saturated hydrocarbons at considerably high temperature and pressure (>250

^{\circ} C

and >20 bar) [46,47] . The second pathway is called semi‐indirect or indirect conversion through multiple reactors.…”

Section: Introductionmentioning

confidence: 99%

“…The latter materials (i. e., olefins) could be successfully hydrogenated with the aid of metallic catalysts and are thus converted into saturated hydrocarbons at considerably high temperature and pressure (> 250 � C and > 20 bar). [46,47] The second pathway is called semiindirect or indirect conversion through multiple reactors. The method is generally achieved via conversion of syngas into methanol and/or DME (dimethyl ether) separately, then these are further transformed into hydrocarbons of LPG fractions (olefins and paraffins) and finally the hydrogenation of olefins into the main LPG products.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Conversion of Synthetic Gas to LPG over Hybrid Nanostructure Zeolites Catalysts

Al-Qadri

Nasser

Galadima³

et al. 2022

ChemistrySelect

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Recently, Liquified petroleum gas (LPG) attracts wide applications due to its high heating value and clean combustibility. An innovative approach to synthesis of LPG from syngas was established based on Fisher-Tropsch (F-T) technology. However, the conversion and selectivity are generally low with the classical catalysts. The hybrid system of methanol and zeolitebased catalyst was established as a potential approach to promote such a process. To strongly overcome the large demand of LPG and grasp the research work in this subject, a comprehensive review became necessary. LPG is basically produced from syngas through the direct method, where most recent studies lay on, and the indirect or semi direct approach. There were several factors affecting the process performance, which mainly are the reaction temperature, reaction pressure, type of the hybrid catalyst, carbon monoxide to hydrogen ratio, mixture flow rate, and time-on-stream of the reaction. The most common reaction conditions reported in the literature are 260-400 °C, 10-50 bars and H 2 to CO ratio of 2. However, the most important parameter considered was the catalyst, which is a key factor of interest. The two main issues controlling the catalyst performance were the synergetic effect between the two hybridized catalysts and the used type of zeolite. It was perceived that the higher the zeolite membered rings the better the LPG selectivity (i. e., BEA, and USY provided the higher LPG production rate).

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Implanting Copper−Zinc Nanoparticles into the Matrix of Mesoporous Alumina as a Highly Selective Bifunctional Catalyst for Direct Synthesis of Dimethyl Ether from Syngas

Cited by 8 publications

References 44 publications

Catalytic Conversion of Carbon Oxides in Confined Spaces: Status and Prospects

Catalytic Conversion of Carbon Oxides in Confined Spaces: Status and Prospects

Versatile Hollow ZSM-5 Nanoreactors Loaded with Tailorable Metal Catalysts for Selective Hydrogenation Reactions

A Review on the Conversion of Synthetic Gas to LPG over Hybrid Nanostructure Zeolites Catalysts

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