CO2-Assisted Dehydrogenation of Propane to Propene over Zn-BEA Zeolites: Impact of Acid–Base Characteristics on Catalytic Performance

Catalysts, Год журнала: 2023, Номер 13(4), С. 681 - 681

Опубликована: Март 31, 2023

Research results about the influence of BEA zeolite preliminary dealumination on acid–base characteristics and catalytic performance 1% Zn-BEA compositions in propane dehydrogenation with CO2 are presented. The catalyst samples, prepared through a two-step post-synthesis procedure involving partial or complete specimen followed by introduction Zn2+ cations into T-positions framework, were characterized using XRD, XPS, MAS NMR, SEM/EDS, low-temperature N2 ad/desorption, C3H8/C3H6 (CO2, NH3)-TPD, TPO-O2, FTIR-Py techniques. Full resulted development mesoporous structure specific surface area (BET) twofold decrease total acidity basicity Zn-BEA, formation Lewis acid sites basic predominantly medium strength, as well removal Brønsted from surface. In presence ZnSiBEA catalyst, which had lowest basicity, obtained selectivity 86–94% yield 30–33% for propene (at 923 K) exceeded values ZnAlSiBEA ZnAlBEA. with/without carbon dioxide showed advantages producing target olefin catalysts.

Язык: Английский

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Highly selective electrocatalytic reduction of CO₂ to ethane over a petal-like Zn(OH)₂/Cu₂₊₁O/Cu foam catalyst at low overpotentials

Journal of Materials Chemistry A, Год журнала: 2024, Номер 12(22), С. 13510 - 13519

Опубликована: Янв. 1, 2024

Due to multiple reaction steps and a lack of efficient catalysts, the synthesis ethane from CO 2 electroreduction (ECO RR) is particularly challenging. A Zn(OH) /Cu 2+1 O/CF catalyst was applied in electrocatalytic reduction ethane, which offers high selectivity at low overpotentials.

Язык: Английский

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Mass-Transfer Enhancement in the CO₂ Oxidative Dehydrogenation of Propane over GaN Supported on Zeolite Nanosheets with a Short b-Axis and Hierarchical Pores

ACS Catalysis, Год журнала: 2024, Номер 14(13), С. 10376 - 10391

Опубликована: Июнь 25, 2024

The CO2 oxidative dehydrogenation of propane (CO2–ODHP) is a highly important reaction for not only producing large amounts propylene but also consuming the resource. GaN/zeolite catalysts deliver preferable activity in reaction. However, similar to Pt- and Cr-based catalysts, there are shortcomings such as poor stability coke accumulation, especially when operated at temperatures higher than 550 °C. Generally, carbon deposition one main reasons catalyst deactivation. limited mass transfer greatly aggravates deposited formation, since precursors could be removed time. In present work, we modified zeolites with short b-axis hierarchical pores, which offer shorter diffusion distance pore-rich structure enhance transfer. Thanks this enhancement, offers an initial conversion 68.0% yield 39.4% propylene, surpassing other reported data. Importantly, showed low loss rate amount carbon, was easily regenerated compared those without or pores. Density functional theory (DFT) calculations situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) confirmed that involves coupling direct reduction via reverse water–gas shift reaction, participates work sheds light on designing efficient CO2–ODHP transfer-boosted strategy and, importantly, expected provide inspiration constructing zeolite

Язык: Английский

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High specific surface area inherited from sea-urchin-like AACH clusters prepared by a novel spray precipitation

Rare Metals, Год журнала: 2022, Номер 41(11), С. 3684 - 3693

Опубликована: Сен. 1, 2022

Язык: Английский

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Recent progress on the traditional and emerging catalysts for propane dehydrogenation

Journal of Industrial and Engineering Chemistry, Год журнала: 2022, Номер 118, С. 1 - 18

Опубликована: Ноя. 7, 2022

Язык: Английский

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Comparison of direct and CO2-oxidative dehydrogenation of propane

Trends in Chemistry, Год журнала: 2023, Номер 5(11), С. 840 - 852

Опубликована: Сен. 29, 2023

Язык: Английский

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Co-modified Fe₂O₃–ZrO₂ for catalyzing propane and CO₂ reaction to propylene

New Journal of Chemistry, Год журнала: 2024, Номер 48(23), С. 10607 - 10615

Опубликована: Янв. 1, 2024

Moderate Co-promoted reduction of Fe 2 O 3 to active 4 for high transformation CO (C H 8 ) C 6 through accelerating RWGS.

Язык: Английский

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Reactive Carbon Capture: Cooperative and Bifunctional Adsorbent-Catalyst Materials and Process Integration for a New Carbon Economy

Accounts of Chemical Research, Год журнала: 2024, Номер 57(16), С. 2383 - 2394

Опубликована: Июль 26, 2024

ConspectusTo say the least, releasing CO2 into atmosphere is reaping undue environmental consequences given ever-present increase in severe global weather events over past five years. However, it can be argued that–at least confines of current technological capabilities–the atmospheric release somewhat unavoidable that even shifting toward clean energy sources–such as solar, nuclear, wind, battery, or H2 power–incurs an initial carbon requirement by way manufacturing very production abilities through which "clean" generated. Even years from now, experts agree will diversified and–as population continues to drive growth consumption–thermal power derived combustion likely remain one intrinsic energetic source, always a byproduct. In this context, responsibility scientific community devise improved pathways management such (i) on environment are reduced and (ii) fuels leveraged sustainable fashion.In Account, we discuss pivotal perspective shift emissions considerable breakthrough material science our work shape engineering nanoporous adsorbents catalysts. This account details development materials no longer vilify valueless byproduct, instead providing path for them become potential feedstock. more specific terms, structured, cooperative "bifunctional" (BFMs) comprised high-temperature adsorbent heterogeneous catalyst enable single-bed capture utilization oxidative ethane dehydrogenation (ODHE), propane (ODHP), dry methane reforming (DMR) processes. Account begins with conceptual BFMs powdered state, followed detailing first-ever reports structuring facile honeycomb contactors 3D printing. The then summarizes impressive performance 3D-printed BFMs, specifically focusing how their catalysts (metal oxides perovskites) influence reactive performances ODHE, ODHP, DMR Such promise CO2-as-fuel offers glimpse future economy, CO2/fuel looping play important role. A major factor achieving is, course, developing appropriately active catalyst; whose first breakthroughs detailed herein.

Язык: Английский

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Current and Future Role of Natural Gas Supply Chains in the Transition to a Low-Carbon Hydrogen Economy: A Comprehensive Review on Integrated Natural Gas Supply Chain Optimisation Models

Energies, Год журнала: 2023, Номер 16(22), С. 7672 - 7672

Опубликована: Ноя. 20, 2023

Natural gas is the most growing fossil fuel due to its environmental advantages. For economical transportation of natural distant markets, physical (i.e., liquefaction and compression) or chemical direct indirect) monetisation options must be considered reduce volume meet demand different markets. Planning supply chains a complex problem in today’s turbulent especially considering uncertainties associated with final market competition emerging renewable hydrogen energies. This review study evaluates latest research on mathematical programming MILP MINLP) as decision-making tool for designing planning under horizons. The first part this assesses status existing infrastructures by addressing readily available options, quantitative tools selecting single-state multistate chain optimisation models. second investigates potential energy carrier integration chains, carbon capture utilisation, storage technologies. foreseen decarbonise systems, diversify product portfolio, fill gap between current future need cleaner commodities. Since markets are has replace fuels future, stochastic conditions uncertainty vital hedge against risks through responsive project’s early design stages. Hence, studies works hydrogen–natural were reviewed deterministic conditions. Only models optimisation, including linear nonlinear models, evaluate effectiveness each proposed approach.

Язык: Английский

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Effect of Surface Acidity/Basicity of Cr/Zn−BEA Zeolite Catalysts on Performance in CO₂‐PDH Process

ChemistrySelect, Год журнала: 2024, Номер 9(11)

Опубликована: Март 14, 2024

Abstract The influence of adding Cr(III) compounds into Zn−BEA zeolite samples (with silicate modulus Si/Al=17, 100, and 1000) on the redox acid–base characteristics Cr/Zn−BEA zeolites were studied, their catalytic properties in propane dehydrogenation with CO 2 to propylene. It was established (based XRD, low–temperature (77 K) ad/desorption N , TPR−H TPD−MSC−NH 3 (CO ), C H 8 (C 6 FTIR−Py data) that surface bifunctional catalysts, namely amount, strength, nature (Lewis Brønsted sites), determine activity/selectivity, operation stability process −PDH. This indicates over runs along route direct combined reverse water gas shift reaction.

Язык: Английский

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