Kinetic Model for the Direct Conversion of CO₂/CO into Light Olefins over an In₂O₃–ZrO₂/SAPO-34 Tandem Catalyst

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(4), P. 1616 - 1624

Published: Jan. 18, 2024

An original kinetic model is proposed for the direct production of light olefins by hydrogenation CO2/CO (COx) mixtures over an In2O3–ZrO2/SAPO-34 tandem catalyst, quantifying deactivation coke. The reaction network comprises 12 individual reactions, and quantified with expressions dependent on concentration methanol (as coke precursor) H2O H2 agents attenuating formation). experimental results were obtained in a fixed-bed reactor under following conditions: mass ratio, 0/1–1/0; 350–425 °C; 20–50 bar; H2/COx 1–3; CO2/COx 0–1; space time, 0–10 gIn2O3–ZrO2 h molC–1, 0–20 gSAPO-34 molC–1; up to 500 h; CH3OH feed, 5% vol. utility further scale-up studies demonstrated its application optimizing process variables (temperature, pressure, ratio). predicts olefin yield higher than 7% (selectivity above 60%), COx conversion 12% CO2 16% at 415 °C 50 bar, = 0.5 feed. Additionally, analysis effect In2O3–ZrO2 SAPO-34 loading configuration catalyst conducted, yielding 17% complete full water removal conditions.

Language: Английский

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ZnZrO_x Nanoparticles Derived from Metal–Organic Frameworks as Superior Catalysts to Boost CO₂ Hydrogenation to Methanol

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(16), P. 19677 - 19687

Published: Aug. 13, 2024

ZnZrOx solid solution is a promising catalyst for the hydrogenation of CO2 to methanol, but precise design nanostructure enhance catalytic performance remains significant challenge. Herein, ZnZrOx-based (ZnZrOx-MD) nanoparticle with uniform metal dispersion and remarkable activation ability was developed via calcination metal–organic frameworks [MOFs, viz., PCN-223(Zn)] mixed (Zr Zn) as precursors. It found that ZnZrOx-MD outperformed its counterparts prepared using traditional deposition–precipitation method (ZnZrOx-TD). Furthermore, effects micromorphology crystal composition on were systematically investigated. Comprehensive characterization results reveal contained abundant oxygen vacancies, large specific surface area, dispersion, which collectively contributed excellent performance, resulting in high methanol selectivity 77.2% at 320 °C. In situ DRIFTS experiments confirm mechanism over catalysts involved initial formation HCOO* species, followed by subsequent generate CH3O* ultimately produce methanol. Overall, this work highlights potential benefits MOFs thermal decomposition precursors fabrication solid-state unique properties.

Language: Английский

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Hydrogen enrichment in methanol SI engine at varying injection timing during compression stroke

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 89, P. 952 - 963

Published: Oct. 2, 2024

Language: Английский

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CO2 to Methanol Conversion: A Bibliometric Analysis with Insights into Reaction Mechanisms, and Recent Advances in Catalytic Conversion

Processes, Journal Year: 2025, Volume and Issue: 13(2), P. 314 - 314

Published: Jan. 23, 2025

The rising levels of atmospheric carbon dioxide (CO2) necessitate urgent and effective strategies for its capture utilization. Among the various CO2 valorization pathways, conversion into methanol has gained considerable attention due to dual role in reducing greenhouse gas emissions serving as a renewable fuel chemical feedstock. This review uniquely combines bibliometric analysis 13,289 peer-reviewed publications (2012–2023) with an evaluation Cu-based catalyst advancements, addressing critical gaps literature. A highlights key trends, collaborations, research field. catalytic systems, noble metals, though highly active, are uneconomical large-scale applications, while non-noble such nickel, exhibit limited activity undesired reaction pathways. In comparison, catalysts overcome these challenges by offering balance activity, selectivity, cost-effectiveness. Special emphasis is placed on insights thermodynamic constraints, emerging solutions, potential directions future research. By consolidating current state knowledge, this identifies significant opportunities advancing technologies, particularly synthesis, positioning it promising strategy sustainable management energy production.

Language: Английский

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Synthesizing Liquid Fuels Over Carbon‐Based Catalysts Via Co₂ Conversion

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 26, 2025

Abstract The unique characteristics of carbon materials make them flexible for applications in heterogeneous catalysis. Their interest is expanding the conscious efforts being made toward sustainable fuel production. A notable application heterogenous conversion CO 2 to liquid fuels, which exploits materials, taking advantage their electronic configurations, high surface area, pore properties, and synergistic role In this review, a critical overview rapidly developing field presented. Various allotropes derivatives, as well some strategies fabricating carbon‐based catalysts are keenly highlighted within thermal‐, electro‐, photocatalytic fuels. Distinct emphasis placed on different by investigating synergy attained at catalyst interfaces, physicochemical properties attained, influence enhancing specific fuels synthesis. Finally, work concluded, followed an outlook detailing key challenges that need addressing.

Language: Английский

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