Constructing Co Cluster Sites for Selective CO₂ Hydrogenation via Phase Segregation from Co-Doped TiO₂ Nanocrystals

Published: Jan. 23, 2025

Article Constructing Co Cluster Sites for Selective CO2 Hydrogenation via Phase Segregation from Co-Doped TiO2 Nanocrystals Xiangru Wei 1, Yizhen Chen Yulu Zhang Liyue Lu Ma 2, Matthew M. Yung 3 and Sen 1,* 1 Department of Chemistry, University Virginia, Charlottesville, VA 22904, USA 2 National Synchrotron Light Source II, Brookhaven Laboratory, Upton, NY 11973, Bioenergy Science Technology Directorate, Renewable Energy Denver West Parkway, Golden, CO 80401, * Correspondence: [email protected] Received: 7 November 2024; Revised: January 2025; Accepted: Published: 23 2025 Abstract: This article presents a phase segregation strategy creating stable cluster catalytic sites on TiO2, enabling selective hydrogenation to CO. Through oxidative calcination, pre-synthesized Co-doped brookite nanorods transform into mixed phase, leading the species. The resulting clusters, stabilized by strong Co-TiO2 interactions during reductive hydrogenation, effectively suppress formation larger nanoparticles. undercoordinated these clusters promote high production rate with near-unit selectivity, contrasting nanoparticles, which favor CH4 under identical conditions. In-situ diffuse reflectance infrared Fourier spectroscopy (DRIFTS) analysis indicates that weakened adsorption is key their enhanced highlighting this method as promising approach efficient utilization.

Language: Английский

---

Unveiling the Role of Zn/Zr Ratios in ZnO/ZrO₂ Catalysts Prepared via Reverse Co-precipitation Method for Efficient CO₂ to Methanol Conversion

ACS Omega, Journal Year: 2025, Volume and Issue: unknown

Published: May 13, 2025

This study evaluates the catalytic performance of ZnO/ZrO2 catalysts, which were synthesized through reverse co-precipitation with Zn/(Zn + Zr) ratios varying from 0 to 100%, for converting CO2 into methanol (CH3OH). The catalysts underwent systematic characterization using XRD, TEM-EDS mapping, N2 adsorption-desorption, XPS, and TPD-MS techniques, focusing on both H2 interactions. Results showed that pure ZnO typically forms as aggregated needles, while ZrO2 manifests clustered aggregates significantly smaller nanoparticles. At lower Zn contents (20-30%), particles are small evenly distributed among nanoparticles, effectively inhibiting aggregation. Conversely, at higher (40-80%), increase in size, remain tend accumulate predominantly surfaces larger particles. Catalysts a predominance exhibited greater adsorption, whereas those increased adsorption. Zn60Zr40 (60 wt % Zn) catalyst was identified optimal, achieving 11.8% conversion 340 °C, peak CH3OH selectivity 74.0% 320 °C yield 6.1% maintaining excellent stability over 100 h. Furthermore, found direct correlation between activity gas adsorption: adsorption rates improved conversion, more influenced by These findings underscore importance adsorptive properties determining product distribution offer essential insights designing optimized efficient production hydrogenation.

Language: Английский

---

Recent advances in doping engineering of heterogeneous catalyst for carbon dioxide hydrogenation

Materials Today Chemistry, Journal Year: 2025, Volume and Issue: 46, P. 102770 - 102770

Published: May 23, 2025

Language: Английский

---

Improvement of Catalytic Performance of Mg-Znzrox/Sapo-34 Bifunctional Catalysts by Synergistic Modulation of Zeolite Pore Structure and Acidity

Published: Jan. 1, 2025

Language: Английский

---