Article
Chemistry, Physical
Sebastian Cisneros, Shilong Chen, Thomas Diemant, Joachim Bansmann, Ali M. Abdel-Mageed, Michael Goepel, Sine E. Olesen, Eike S. Welter, Magdalena Parlinska-Wojtan, Roger Glaeser, Ib Chorkendorff, R. Juergen Behm
Summary: In this study, four different Ru/TiO2 catalysts were prepared and examined to investigate the impact of SiO2 content on the catalysts' performance in selective CO methanation. The results showed a volcano-shaped dependence of methane formation activity on SiO2 content, with the maximum activity observed at 4-8 wt.%. Additionally, weaker CO adsorption strength was found in the most active catalysts, indicating a complex combination of different effects contributing to the higher activity and lower CO adsorption strength.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Zhisheng Shi, Jiacheng Feng, Xinfa Dong
Summary: This study develops Ru-Ni bimetallic catalysts supported on graphene aerogel-mixed metal oxide (GA-MMO) as an efficient CO selective methanation (CO-SMET) for H2-rich gases purification. The GA-MMO aerogel with a three-dimensional network structure exhibits higher specific surface area, better thermal stability, and more defects or structural disorders at the MMO:GO mass ratio of 1-4. The Ru-loaded GA-MMO catalyst enhances reactivity through the reduction of NiO to metallic Ni by hydrogen spillover effect. Compared to the MMO-supported Ru-Ni catalyst, the GA-MMO supported catalyst shows better catalytic performance and stability due to its excellent metal dispersion, reducibility, stronger CO adsorption, and activation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Ali M. Abdel-Mageed, Klara Wiese, Ashlee Hauble, Joachim Bansmann, Jabor Rabeah, Magdalena Parlinska-Wojtan, Angelika Brueckner, R. Jurgen Behm
Summary: By investigating oxide-supported Ru catalysts, it was found that the support particle size can influence the selectivity of the catalyst, thus controlling the formation of CO2 reduction reaction products. High-temperature treatment leads to an increase in oxygen vacancies and charge transfer, resulting in alterations to the catalyst's reaction characteristics.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
L. F. Bobadilla, A. Munoz-Murillo, J. Gandara-Loe, A. Perez, O. H. Laguna, T. L. M. Martinez, A. Penkova, M. A. Centeno, J. A. Odriozola
Summary: This study focuses on the development of efficient catalysts for selective CO methanation in practical conditions. The results show that Rh significantly enhances the activity and selectivity, while Pt has a negative effect. These findings suggest that RuRh-based catalysts could be important for treating industrial-volume streams.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Xiaoyu Li, Yujia Han, Yike Huang, Jian Lin, Xiaoli Pan, Ziang Zhao, Yanliang Zhou, Hua Wang, Xiaofeng Yang, Aiqin Wang, Lin Li, Botao Qiao, Xiaodong Wang
Summary: Developing efficient CO selective methanation catalysts by utilizing hydrogenated TiO2 as support is a promising strategy, achieving CO removal below 10 ppm with over 50% selectivity in a wide temperature range and good long-term stability. Detailed characterizations and calculations showed that the use of H-TiO2 strengthened CO adsorption on the catalyst surface, leading to improved CO activation and selectivity enhancement.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Energy & Fuels
Arash Badakhsh, Hizkia Manuel Vieri, Hyuntae Sohn, Sung Pil Yoon, Sun Hee Choi
Summary: Ammonia (NH3) is a promising alternative to hydrogen in the energy sector due to its carbon-free nature and high hydrogen content. However, current NH3 synthesis processes consume a significant amount of energy and contribute to CO2 emissions. To improve efficiency, new catalysts are needed for NH3 synthesis under milder conditions. In this study, we developed a Ru supported on perovskite catalyst using a ball-milling-assisted exsolution method. The catalyst showed tunable morphology and better resistance to deactivation mechanisms compared to the conventional impregnated catalyst.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Physical
T. L. M. Martinez, A. Munoz, A. Perez, O. H. Laguna, L. F. Bobadilla, M. A. Centeno, J. A. Odriozola
Summary: The aim of this study was to investigate the influence of the support on the CO selective methanation reaction using Ru/TiO2 catalysts. The results showed that the activity and selectivity changes were related to the anatase:rutile ratio, solid solution formation of RuO2 +TiO2, metal content, and thermal treatment. These characteristics led to the formation of active and selective catalysts. It was found that the presence of hydroxyl groups on the support surface played a crucial role in the activity and selectivity of Ru/TiO2 catalysts during CO activation.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
James M. Crawford, Brittney E. Petel, Mathew J. Rasmussen, Thomas Ludwig, Elisa M. Miller, Sawyer Halingstad, Sneha A. Akhade, Simon H. Pang, Matthew M. Yung
Summary: Washing with aqueous ammonia can remove chlorine contamination and improve the methane production activity of Ru/TiO2 catalyst. Low loading Ru catalysts show the most significant activity enhancement after washing.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Physical
Jing Yang, Liqiang Lv, Shuo Cui, Cuihong Sun, Li Sun, Boxuan Shi, Edward Sharman, Jun Jiang, Chuanyi Jia
Summary: As an important factor in the design of catalysts, catalytic descriptor exploration has become a new frontier in heterogeneous catalysis. The underlying structure-activity relationships of Ru-based catalysts are theoretically studied to provide insights in this field. Calculations of different reaction paths suggest that the HCO*-mediated path, due to two synergistic active sites, is more favorable. Furthermore, the presence of Cl enhances the hydrocarbon production, while the presence of S decreases it. Through a systematic examination of numerous structure-activity relationships, it is found that both charge transfer and average charge difference of active Ru atoms are good descriptors for the binding stability of reactants. However, the Gibbs free energy of the reactants performs better in terms of reactivity. Interestingly, the correlations between the dissociation and hydrogenation steps have opposite slopes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Shuai Yang, Xinyang Li, Jiawen Ma, Haiwei Guo, Yifeng Chen, Zhao Chen, Gengbo Ren, Xiaodong Ma
Summary: In this study, atomically dispersed Ru catalysts were synthesized and demonstrated to have good catalytic performance and stability for the oxidation of polychlorinated aromatic hydrocarbons.
Article
Multidisciplinary Sciences
Jun Zhou, Zhe Gao, Guolei Xiang, Tianyu Zhai, Zikai Liu, Weixin Zhao, Xin Liang, Leyu Wang
Summary: Supports play a crucial role in determining the catalytic performance of metal nanoparticles. The interfacial compatibility between metal and support can significantly affect the metal-support interaction modes and catalytic performances in CO2 hydrogenation. The study demonstrates that the metal-support interfacial compatibility of Ru/TiO2 can critically control the catalyst's performance.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Sana Ullah, Emma C. Lovell, Tze Hao Tan, Bingqiao Xie, Priyank Kumar, Rose Amal, Jason Scott
Summary: The study showed that illuminating the Co10/Lax-TiO2 catalyst with visible light can enhance the efficiency of CO2 methanation reaction, especially with lanthanum (La) doping, which significantly lowers the activation energy and improves CO2 conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Sergio Lopez-Rodriguez, Arantxa Davo-Quinonero, Esther Bailon-Garcia, Dolores Lozano-Castello, Agustin Bueno-Lopez
Summary: The study examined the effect of Ru loading on CeO2 supports for the CO2 methanation reaction, finding that 2.5 wt.% Ru loading showed optimal performance with respect to both the interaction between Ru and ceria and the efficiency of CO2 conversion. The catalyst comprises a balance between surface carbon group formation and further hydrogenation at this loading.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Chengeng Li, Pau Ferri, Cecilia Paris, Manuel Moliner, Mercedes Boronat, Avelino Corma
Summary: By combining kinetics and theoretical calculations, research shows the benefits of moving beyond the concept of static localized and defined active sites on solid catalysts, and considering active sites in an environment suitable for the target reaction. Optimizing the location, density, and environment of acid sites can selectively drive reactions through specific mechanisms, leading to improved catalytic performance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Christopher Hunston, David Baudouin, Leo Koning, Ayush Agarwal, Oliver Kroecher, Frederic Vogel
Summary: The performance of Ru catalysts with different sizes of Ru nanoparticles (NP) in continuous supercritical water gasification (SCWG) of glycerol was evaluated. It was demonstrated that Ru NPs smaller than 1.2 nm had high initial turnover frequencies (TOF). Deactivation of the catalysts was mainly caused by coking and sintering. A correlation between TOF and the density of surface Ru atoms was found, and an optimal surface density resulted in high initial and steady-state TOFs, prolonging the lifetime by delaying coke formation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Maria Hatzisymeon, Athanasia Petala, Paraskevi Panagiotopoulou
Summary: The catalytic activity of supported Ni and Ru catalysts is significantly influenced by the nature of the metal oxide support. The dispersion of metal plays a key role in determining the catalytic performance, with Ni showing higher activity on TiO2 and Ru exhibiting better performance when supported on TiO2.
Article
Engineering, Chemical
Georgios Bampos, Theodora Ramantani, Paraskevi Panagiotopoulou, Xenophon E. Verykios
Summary: The study investigated the influence of metal oxide support types on the reactive adsorption of residual CO on Pd-based catalysts, with Pd/ZrO2 showing the best performance in adsorption. The results suggest that both the dispersed metal and the support participate in the process, which could be applied effectively as a final cleanup step in fuel processors.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)