Molecular Views on Fischer–Tropsch Synthesis

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(9), P. 5798 - 5858

Published: March 10, 2023

For nearly a century, the Fischer-Tropsch (FT) reaction has been subject of intense debate. Various molecular views on active sites and mechanism have presented for both Co- Fe-based FT reactions. In last 15 years, emergence surface-science- molecular-modeling-based bottom-up approach brought this picture step closer. Theoretical models provided structural Co catalyst particles. Recent surface science experiments density functional theory (DFT) calculations highlighted importance realistic coverages, which can induce reconstruction impact stability intermediates. Co-based FTS, detailed microkinetic simulations mechanistic are moving toward consensus about mechanism. The dynamic phase evolution catalysts under conditions complicates identification structure sites. New techniques help tackle combinatorial complexity in these systems. Experimental DFT studies addressed catalysts; absence clear sites, however, limits development view Finally, direct CO2 hydrogenation to long-chain hydrocarbons could present sustainable pathway synthesis.

Language: Английский

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From fossil to green chemicals: sustainable pathways and new carbon feedstocks for the global chemical industry

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(7), P. 2879 - 2909

Published: Jan. 1, 2023

Green methanol and green ammonia produced by renewable electricity electricity-based hydrogen become the backbone for a defossilised global chemical industry.

Language: Английский

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The industry transformation from fossil fuels to hydrogen will reorganize value chains: Big picture and case studies for Germany

Applied Energy, Journal Year: 2024, Volume and Issue: 358, P. 122485 - 122485

Published: Jan. 6, 2024

In many industries, low-carbon hydrogen will substitute fossil fuels in the course of transformation to climate neutrality. This paper contributes understanding this transformation. provides an overview energy- and emission-intensive industry sectors with great potential defossilize their production processes hydrogen. An assessment future demand for various defossilization strategies Germany that rely on as a feedstock or energy carrier different extent steel, chemicals, cement, lime, glass, well pulp is carried out. Results indicate aggregate industrial those industries would range between 197 TWh 298 if did not relocate abroad any sector. The mainly due differences utilization compared alternative paths example based electrification. attractiveness then assessed prospective comparative cost advantage relocating parts value chain excellent sites Case studies are provided steel industry, chemical ethylene through methanol urea basis ammonia. respective chains case partly located regions conditions renewable energies production. results illustrate, at least some – ammonia relocation favorable may occur substantial advantages.

Language: Английский

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Confining platinum clusters in indium-modified ZSM-5 zeolite to promote propane dehydrogenation

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 2, 2024

Designing highly active and stable catalytic sites is often challenging due to the complex synthesis procedure agglomeration of during high-temperature reactions. Here, we report a facile two-step method synthesize Pt clusters confined by In-modified ZSM-5 zeolite. In-situ characterization confirms that In located at extra-framework position as In+, are stabilized In-ZSM-5 The resulting in show excellent propane conversion, propylene selectivity, stability, outperforming monometallic Pt, In, bimetallic PtIn alloys. incorporation In+ neutralizes Brønsted acid inhibit side reactions, well tunes electronic properties facilitate activation desorption. strategy combining precious metal with cation-exchanged zeolites opens avenue develop heterogeneous catalysts for other reaction systems. procedures Here authors present ZSM-5, superior dehydrogenation performance.

Language: Английский

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The green chemistry paradigm in modern organic synthesis

Russian Chemical Reviews, Journal Year: 2023, Volume and Issue: 92(12), P. RCR5104 - RCR5104

Published: Dec. 1, 2023

After the appearance of green chemistry concept, which was introduced in vocabulary early 1990s, its main statements have been continuously developed and modified. Currently, there are 10–12 cornerstones that should form basis for an ideal chemical process. This review analyzes accumulated experience achievements towards design products processes reduce or eliminate use generation hazardous substances. The presents views leading Russian scientists specializing various fields this subject, including homogeneous heterogeneous catalysis, fine basic organic synthesis, electrochemistry, polymer chemistry, based on bio-renewable feedstocks energetic compounds materials. A new approach to quantitative evaluation environmental friendliness by authors is described. <br> bibliography includes 1761.

Language: Английский

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Decisive Influence of SAPO-34 Zeolite on Light Olefin Selectivity in Methanol-Meditated CO₂ Hydrogenation over Metal Oxide-Zeolite Catalysts

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(22), P. 14627 - 14638

Published: Oct. 30, 2023

Methanol-mediated CO2 selective hydrogenation to light olefins (LO) over bifunctional catalysts containing metal oxide and zeolite components is an attractive sustainable chemical process. The main challenges of this process include achieving high LO selectivity low paraffins CO. Herein, we analyze the selectivity–conversion correlations oxide-zeolite elucidate functions each catalyst component. A series catalytic systems based on oxides Zn, In, Mn, Cr, or Ga different SAPO-34 zeolites were synthesized evaluated at conversion levels. It was uncovered that within hydrocarbon fractions ultimately depended component decreased as a function yield. responsible for conversion, overall hydrocarbon, CO selectivities. morphology acidity identified major descriptors CO-free in catalysts.

Language: Английский

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Ethylene production via photocatalytic dehydrogenation of ethane using LaMn1−xCuxO3

Nature Energy, Journal Year: 2024, Volume and Issue: 9(6), P. 750 - 760

Published: June 6, 2024

Language: Английский

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Photothermal conversion of CO2 into lower olefins at the interface of the K-promoted Ru/Fe3O4 catalyst

Chem Catalysis, Journal Year: 2024, Volume and Issue: 4(4), P. 100960 - 100960

Published: April 1, 2024

Language: Английский

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Carbon-based catalytic materials for aerobic oxidative transformation of 5-hydroxymethylfurfural: advancements, challenges, and opportunities

Green Chemistry, Journal Year: 2024, Volume and Issue: 26(12), P. 6886 - 6899

Published: Jan. 1, 2024

This review systematically discusses the recent progress in selective aerobic oxidation of 5-hydroxymethylfurfural using various carbon-based catalytic materials.

Language: Английский

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Liquid metals for boosting stability of zeolite catalysts in the conversion of methanol to hydrocarbons

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: March 12, 2024

Methanol-to-hydrocarbons (MTH) process has been considered one of the most practical approaches for producing value-added products from methanol. However, commonly used zeolite catalysts suffer rapid deactivation due to coke deposition and require regular regeneration treatments. We demonstrate that low-melting-point metals, such as Ga, can effectively promote more stable methanol conversion in MTH by slowing facilitating desorption carbonaceous species zeolite. The ZSM-5 physically mixed with liquid gallium exhibited an enhanced lifetime reaction, which increased a factor up ~14 compared parent ZSM-5. These results suggest alternative route design preparation deactivation-resistant catalysts.

Language: Английский

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