Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California Riverside, 446 Winston Chung Hall, 900 University Ave, Riverside, USA.
Department of Chemistry, College of Natural & Agricultural Sciences, University of California Riverside, 501 Big Springs Rd, Riverside, USA.
Chem Asian J. 2022 Feb 14;17(4):e202101253. doi: 10.1002/asia.202101253. Epub 2022 Jan 22.
The reforming of methane from biogas has been proposed as a promising method of CO utilization. Co-based catalysts are promising candidates for dry methane reforming. However, the main constraints limiting the large-scale use of Co-based catalysts are deactivation through carbon deposition (coking) and sintering due to weak metal-support interaction. We studied the structure-function properties and catalytic behavior of Co/TiO and Co-Ru/TiO catalysts using two different types of TiO supports, commercial TiO and faceted non-stoichiometric rutile TiO crystals (TiO *). The Co and Ru metal particles were deposited on TiO supports using a wet-impregnation method with the percentage weight loading of Co and Ru of 5% and 0.5%, respectively. The materials were characterized using SEM, STEM-HAADF, XRD, XPS and BET. The catalytic performance was studied using the CH : CO ratio of 3 : 2 to mimic the methane-rich biogas composition. Our results indicate that the addition of Ru to Co catalysts supported on TiO * reduces carbon deposition and influences oxygen mobility. Co and Co-Ru catalysts supported on TiO * has superior activity with the highest conversion of CO and CH of 34.7% and 23.5%, respectively. Despite the improved performance, the Co-Ru/TiO * catalyst has limited stability due to the proliferation of nanoparticle growth and TiO layers on the surface of the nanoparticles indicating the prevalence of the strong-metal support interaction.
从沼气中重整甲烷已被提议作为一种有前途的 CO 利用方法。基于 Co 的催化剂是干甲烷重整的有前途的候选者。然而，限制基于 Co 的催化剂大规模使用的主要限制因素是由于金属-载体相互作用较弱而导致的通过碳沉积（结焦）和烧结引起的失活。我们使用两种不同类型的 TiO 载体（商业 TiO 和具有非化学计量比的锐钛矿 TiO 晶体（TiO *））研究了 Co/TiO 和 Co-Ru/TiO 催化剂的结构-功能性质和催化行为。使用湿浸渍法将 Co 和 Ru 金属颗粒沉积在 TiO 载体上，Co 和 Ru 的重量负载百分比分别为 5%和 0.5%。使用 SEM、STEM-HAADF、XRD、XPS 和 BET 对材料进行了表征。使用 CH ：CO 比为 3 ：2 来模拟富含甲烷的沼气组成来研究催化性能。我们的结果表明，在 TiO * 上负载 Ru 可减少 Co 催化剂上的碳沉积并影响氧的迁移性。在 TiO * 上负载 Co 和 Co-Ru 的催化剂具有较高的活性，CO 和 CH 的转化率最高分别为 34.7%和 23.5%。尽管性能有所提高，但由于纳米颗粒表面上纳米颗粒生长和 TiO 层的扩散，Co-Ru/TiO * 催化剂的稳定性有限，表明强金属-载体相互作用的普遍性。
