Designing Ni-in intermetallic alloy compounds for high activity and selectivity in low-temperature RWGS reaction

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160529 - 160529

Published: Feb. 1, 2025

Language: Английский

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Intermediate-Temperature Reverse Water–Gas Shift under Process-Relevant Conditions Catalyzed by Dispersed Alkali Carbonates

JACS Au, Journal Year: 2025, Volume and Issue: 5(3), P. 1083 - 1089

Published: March 12, 2025

Current reverse water–gas shift (RWGS) technologies require extreme temperatures of >900 °C. The ability to perform RWGS at lower could open new opportunities for sustainable chemical and fuel production, but most catalyst materials produce methane coke temperatures, especially elevated pressures targeted industrial processes. Here we show that transition-metal-free catalysts composed K2CO3 or Na2CO3 dispersed on commercial γ-Al2O3 supports (K2CO3/γ-Al2O3 Na2CO3/γ-Al2O3) are highly effective in the intermediate-temperature regime. At a high gas hourly space velocity 30,000 h–1 operating pressure 10 bar, K2CO3/γ-Al2O3 reached equilibrium-limited CO2 conversion 550 °C was 100% selective CO all tested (up 700 °C). Na2CO3/γ-Al2O3 also CO-selective only slightly less active. Both were stable hundreds hours stream 525 tolerated large quantities propane impurity CO2/H2 feed. unique performance attributes, combined with low-cost components extremely simple synthesis, make carbonate attractive options application.

Language: Английский

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Role of Reducible and Mobile Oxygens in Methane Partial Oxidation Within a Post‐Plasma Catalytic System

ChemistrySelect, Journal Year: 2025, Volume and Issue: 10(12)

Published: March 1, 2025

Abstract This study examines methane oxidation in a post‐plasma catalysis (PPC) system. Using dielectric barrier discharge plasma with metal oxide‐supported catalysts (Cu/Al, Ni/Al, Fe/Al, and NaW/Al), the effects of reactant feed type, composition, catalyst oxygen species were evaluated for optimizing plasma‐catalytic performance. Key findings indicate that extended O 2 contact time, reduced CH 4 water addition to feed, use mobile oxygen‐enriched catalyst, is NaW/Al, positively influence extent partial oxidation. Notably, NaW/Al plays role improving yields products (CH 3 OH, HCOH, HCOOH) can be replenished through calcination within PPC

Language: Английский

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Encapsulating carbon quantum dots by Zr-MOF-Supported Pt nanoparticles for enhanced photothermal RWGS reaction

Separation and Purification Technology, Journal Year: 2025, Volume and Issue: unknown, P. 132637 - 132637

Published: March 1, 2025

Language: Английский

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