Article
Chemistry, Physical
Abbas Khaleel, Abdul Rasheed Pillantakath, Abdulmuizz Adamson
Summary: Coking is a major cause of catalyst deactivation in catalytic methane reforming processes. Doping the support of Ni/g-Al2O3 catalysts with iron was found to significantly enhance coking resistance in methane partial oxidation, mainly due to the redox functionality of iron after reduction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Chemistry, Physical
T. J. Siang, A. A. Jalil, S. Y. Liew, A. H. K. Owgi, A. F. A. Rahman
Summary: This review provides a comprehensive evaluation of the recent works on the synergistic relationship among catalyst components in methane partial oxidation. The advancements achieved through this synergy enhance the properties of existing catalysts and contribute to the discovery and development of novel catalyst systems.
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Shiva Fazlikeshteli, Xavier Vendrell, Jordi Llorca
Summary: In this study, monometallic Ru, Pd, and bimetallic Ru-Pd catalysts were prepared via mechanochemical and conventional incipient wetness impregnation methods and used in the partial oxidation of methane (POM). The results showed that bimetallic catalysts exhibited higher catalytic activity and stability compared to monometallic ones, and the catalysts prepared by mechanochemical method produced synthesis gas at a lower temperature compared to conventional catalysts.
Article
Chemistry, Physical
Muhammad Anees Ul Hasnain, Asif Hussain Khoja, Faaz Ahmed Butt, Mariam Ayesha, Faisal Saleem, Muhammad Taqi Mehran, Rabia Liaquat, Majid Ali, Zaki Ismail Zaki
Summary: In this study, partial oxidation of methane using Mg-Ni-Al (MNA) hydrotalcite promoted CeO2 catalyst was investigated. The CeO2@MNA catalyst showed good activity and stability, making it suitable for catalytic synthesis reactions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Ya Gao, Yan Wei, Weidong Sun, Guofeng Zhao, Ye Liu, Yong Lu
Summary: Ni-based catalysts with Ni nanoparticles embedded in S-1 zeolite show high activity/selectivity and resistance to carbon deposition and Ni-sintering. However, they still suffer from deactivation due to the formation of a dense Ni-3(Si2O5)(2)(OH)(2) layer that blocks the contact between Ni and reactants.
Article
Chemistry, Physical
Shiva Fazlikeshteli, Xavier Vendrell, Jordi Llorca
Summary: Monometallic Pd and Ni and bimetallic Pd-Ni catalysts supported on CeO2 were prepared and tested for syngas production by the partial oxidation of methane. Bimetallic Pd-Ni/CeO2 catalysts exhibited higher methane conversion and syngas yield compared to monometallic Ni/CeO2 and Pd/CeO2. The bimetallic catalysts prepared by ball milling showed syngas production at lower temperatures. Various preparation parameters were examined, and the best performance was achieved with a bimetallic catalyst prepared at 50 Hz for 20 min, containing only 0.12 wt% Pd and 1.38 wt% Ni. Stability tests demonstrated superior stability for mechanochemically prepared bimetallic Pd-Ni/CeO2 catalysts. The results suggest that the impressive dispersion of metal species and strong interaction with the CeO2 surface contribute to the improved performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Bunyarat Rungtaweevoranit, Ali M. M. Abdel-Mageed, Pongtanawat Khemthong, Srisin Eaimsumang, Khetpakorn Chakarawet, Teera Butburee, Benny Kunkel, Sebastian Wohlrab, Kittipong Chainok, Jakkapop Phanthasri, Suttipong Wannapaiboon, Saran Youngjan, Theerada Seehamongkol, Sarawoot Impeng, Kajornsak Faungnawakij
Summary: Catalytic partial oxidation of methane to methanol using O-2 as an oxidant is a challenging process. In this study, a Fe catalyst supported by a metal-organic framework (MOF), Fe/UiO-66, is reported for the selective and continuous partial oxidation of methane to methanol. The active site for the reaction is identified as electron-deficient Fe species rendered by the MOF support.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Joseph Brindle, Michael M. Nigra
Summary: The selective oxidation of methane is a challenging process, but AuPd nanoparticles have shown promise in activating methane at moderate temperatures and pressures. Through experimental studies, the formation of different surface intermediates and their relationship with selectivity and activity have been explored. It has been hypothesized that water and copper oxide can facilitate the selective oxidation of methane. The results indicate that AuPd catalysts are more active than monometallic Au and Pd catalysts in the presence of water, and the unprotonated formate can increase the methane oxidation rate. Additionally, copper oxide improves the selectivity of methane towards CO but decreases the overall methane consumption.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Michael Martin Romo y Morales, Anthony Brunet-Manquat, Hadi Dib, Jean-Luc Rousset, Franck Morfin, Laurence Burel, Damien Bourgeois, Helena Kaper
Summary: This study uses electronic waste as an alternative source of palladium to prepare heterogeneous catalysts for methane oxidation. The research involves optimizing the leaching protocol to recover palladium from the waste and developing a suitable impregnation protocol from the strongly acidic leachate. The precipitation-deposition technique is found to be suitable for preparing catalysts from acidic media. The impact of Ba, Bi, and Ag impurities on catalytic performance is assessed and discussed through various analytical techniques.
Article
Chemistry, Physical
Maila Danielis, Luis E. Betancourt, Ivan Orozco, Nuria J. Divins, Jordi Llorca, Jose A. Rodriguez, Sanjaya D. Senanayake, Sara Colussi, Alessandro Trovarelli
Summary: The milling of Palladium acetate and CeO2 under dry conditions results in robust and environmentally friendly catalysts with excellent methane oxidation activity. The characterization techniques used in this study identified the presence of Pd-0/Pd2+ species with different degrees of interaction with ceria (Ce3+/Ce4+), which are believed to be responsible for the enhanced catalytic activity. This study provides insight into the mechanistic understanding of the catalytic performance of Pd/CeO2 catalysts prepared by dry milling.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Thanh Son Phan, Doan Pham Minh
Summary: Dry reforming of methane (DRM) is a promising process for producing synthetic gas, and the design of an effective catalyst is crucial. In this study, nickel catalysts supported by calcium hydroxyapatite (HAP) and HAP-doped magnesium (Mg_HAP) were synthesized and evaluated in the DRM reaction. The Ni/HAP and Ni/Mg_HAP catalysts showed outstanding performance due to the tunable acidity-basicity of the supports, strong metal-support interaction, and good thermal stability of nickel nanoparticles. The main products were H2 and CO, with stable selectivity around 85%, while H2O and solid carbon were byproducts with 5-10% selectivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Gianni Caravaggio, Lioudmila Nossova, Matthew Turnbull
Summary: A series of methane oxidation catalysts were prepared by doping SBA-15 with different amounts of zirconia and loading with Pd and Pt. The catalysts were characterized and evaluated for methane oxidation, with the catalyst containing 15 wt% zirconia showing the best performance. The improved performance was attributed to the higher amount of reducible PtOx species near ZrO2 and the sulfur scavenging effect of zirconia.
Review
Chemistry, Physical
Jinxiong Tao, Yuxi Liu, Jiguang Deng, Lin Jing, Zhiquan Hou, Lu Wei, Zhiwei Wang, Hongxing Dai
Summary: The emission of methane contributes to the greenhouse effect and environmental problems. Conventional palladium catalysts are unstable under harsh conditions, but zeolite-supported noble metal catalysts show promise. This review summarizes the development and characteristics of these catalysts for methane combustion and highlights the importance of high-performance catalysts under realistic conditions.
Article
Engineering, Environmental
Osarieme Uyi Osazuwa, Sumaiya Zainal Abidin, Xiaolei Fan, Andrew Nosakhare Amenaghawon, Mohammad Tazli Azizan
Summary: Catalyst preparation methods are crucial for improving catalytic performance by altering the metal-support interaction, changing the kinetics of the catalyst, increasing productivity, reducing costs, and optimizing energy requirements in methane reforming processes.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Review
Chemistry, Physical
Bernard Chukwuemeka Ekeoma, Mohammad Yusuf, Khairiraihanna Johari, Bawadi Abdullah
Summary: Dry reforming of methane (DRM) is a green alternative for utilizing greenhouse gases and producing syngas. The main limitations of DRM are catalyst sintering and coking. Recent studies have focused on Ni-based catalysts for DRM due to economic constraints on noble metal-based catalysts. Mesoporous silica (MS) supported catalysts show promise due to their high surface areas, thermal stability, and easy availability. However, research on MS as a catalyst support for DRM is still limited.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Physics, Multidisciplinary
Kejing Ran, Jinghui Wang, Song Bao, Zhengwei Cai, Yanyan Shangguan, Zhen Ma, Wei Wang, Zhao-Yang Dong, Aermak, A. Schneidewind, Siqin Meng, Zhilun Lu, Shun-Li Yu, Jian-Xin Li, Jinsheng Wen
Summary: This article presents the first polarized inelastic neutron scattering study on alpha-RuCl3 single crystals, revealing the existence of continuous magnetic excitations around the Gamma point, providing evidence for fractional excitations originating from the Kitaev quantum-spin-liquid phase, and supporting the validity of the K-Gamma model.
CHINESE PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Junxiao Chen, Xue Fang, Zhouhong Ren, Weiye Qu, Xiaolei Hu, Zhen Ma, Liwei Chen, Xi Liu, Yaxin Chen, Xingfu Tang
Summary: The development of a novel catalyst Mo-1/TiO2 enables the decomposition of ABS at low temperatures, effectively addressing the issue of SO2 deactivation in SCR catalysts. This provides a new approach to controlling NOx emissions from industrial boilers.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Shuai Cheng, Tao Meng, Dongsen Mao, Xiaoming Guo, Jun Yu, Zhen Ma
Summary: Ni-modified Ag/SiO2 catalysts exhibit enhanced catalytic activity and stability due to the improved dispersion of active Ag species and inhibition of Ag particle growth by the presence of Ni species.
Article
Engineering, Environmental
Xue Fang, Weiye Qu, Tian Qin, Xiaolei Hu, Liwei Chen, Zhen Ma, Xi Liu, Xingfu Tang
Summary: This study investigates the synergy between Ce and W in selective catalytic reduction (SCR) by designing a Ce1-W1/TiO2 model catalyst. The strong electronic interaction within Ce1-W1 atom pairs is found to enhance the SCR performance of Ce1-W1/TiO2 catalysts.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Zhenghang Fu, Libin Cheng, Xingnan Ye, Zhen Ma, Ruoyan Wang, Yusen Duan, Huo Juntao, Jianmin Chen
Summary: With continuous efforts to control air pollutant emissions, the average concentration of PM2.5 in Shanghai met the national secondary standard for the first time. The study found that sulfate pollution was significantly reduced while nitrate loading remained constant. The contribution of automobile exhaust to PM2.5 was seasonally dependent. The rapid increase of nitrate has become a major driver of haze formation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Li Wang, Junbo Wang, Heping Cheng, Xiangxiang Zhou, Zhen Ma
Summary: A series of Ce1-xFexVO4 catalysts prepared by modified hydrothermal synthesis were found to exhibit good catalytic activity in selective catalytic reduction (SCR) of NOx with NH3. Among them, Ce0.5Fe0.5VO4 showed the highest catalytic activity. Characterization analysis revealed the formation of Ce-Fe-V-O solid solutions in Ce0.5Fe0.5VO4, along with significant changes in the average oxidation states of Ce, Fe, V, and O atoms. The presence of more acid sites and active oxygen species in Ce0.5Fe0.5VO4 effectively enhanced the SCR activity.
Article
Chemistry, Physical
Hongyan Xue, Xiaoming Guo, Tao Meng, Dongsen Mao, Zhen Ma
Summary: M/ZSM-5 (M = Mn, Co, Cu) samples were prepared by impregnation and their catalytic performance in NH3-SCR of NO was tested. Cu/ZSM-5 exhibited the highest activity, followed by Mn/ZSM-5, and Co/ZSM-5 was the least active. In-situ DRIFTS analysis revealed the nature and evolution of surface species. Coordinated NH3, NH4+, and amide (-NH2) species derived from NH3 adsorption were found to be relevant for NH3-SCR, while bridged nitrate species derived from NOx adsorption were identified as the main active species. Bridged nitrate was more abundant and thermally more stable on Cu/ZSM-5, consistent with its higher activity compared to Mn/ZSM-5 and Co/ZSM-5. Different mechanisms, including Eley-Rideal and Langmuir-Hinshelwood, were observed for Mn/ZSM-5 at different temperatures, while both pathways coexisted for Co/ZSM-5 and Cu/ZSM-5.
SURFACES AND INTERFACES
(2022)
Article
Physics, Multidisciplinary
Jie Wei, Qinfeng Jiang, Xiaorong Luo, Junyue Huang, Kemeng Yang, Zhen Ma, Jian Fang, Fei Yang
Summary: In this study, a novel SiC double-trench metal-oxide-semiconductor field effect transistor (MOSFET) with integrated MOS-channel diode was proposed and investigated through Sentaurus TCAD simulation. The new SiC MOSFET showed improved performance in terms of reducing the turn-on voltage and suppressing bipolar degradation phenomena. It also exhibited lower reverse recovery charge and reduced reverse recovery loss compared to the traditional SiC double-trench MOSFET. Additionally, the new MOSFET maintained superior forward conduction and blocking performance, with improved breakdown voltage and R(ON,sp) compared to the trench gate MOSFET with planar integrated SBD.
Article
Energy & Fuels
Yanmin Liu, Dongsen Mao, Jun Yu, Xiaoming Guo, Zhen Ma
Summary: This paper investigates the catalytic performance of CuO-CeO2 catalyst in low-temperature CO oxidation under moisture condition. It is found that activation at 550 degrees C enhances the interaction between CuO and CeO2, leading to improved catalytic activity and moisture resistance.
Article
Engineering, Environmental
Weiye Qu, Xue Fang, Zhouhong Ren, Junxiao Chen, Xi Liu, Zhen Ma, Xingfu Tang
Summary: By introducing an appropriate amount of O3 into the simulated stack gas, the SCR activity at low temperatures (<250 degrees C) can be significantly enhanced. The introduction of O3 allows SCR to proceed along a NH4NO3-mediated Langmuir-Hinshelwood model, leading to the enhancement of activity at low temperatures.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Zhen Ma, Wei-Jin Chen, Yuntian Chen, Jin-Hua Gao, X. C. Xie
Summary: We have discovered a new wave localization mechanism in a periodic wave system, which is different from Anderson localization and flat band lattices, and can produce a novel type of flat band. By designing a special periodic confinement potential, we have demonstrated complete electron localization in an open waveguide. This phenomenon, called flat band localization (FBL), is explained by the concept of self-localized orbitals, with each unit cell of the waveguide behaving like an artificial atom.
FRONTIERS OF PHYSICS
(2023)
Article
Chemistry, Physical
Dongrun Xu, Weiye Qu, Junhong Liu, Junxiao Chen, Xue Fang, Liwei Chen, Zhen Ma, Xi Liu, Xingfu Tang, Yaxin Chen
Summary: This study provides evidence that dinuclear vanadium-tungsten sites are the most active catalytic sites in conventional V2O5-WO3/TiO2 SCR catalysts, contrary to the prevailing view. These sites have stronger acidity and higher concentration of vanadium 3d electrons, leading to improved NH3 adsorption and O-2 activation in SCR. This finding settles a long-standing dispute and has important implications for understanding SCR mechanisms and designing better catalysts.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Dongrun Xu, Weiye Qu, Xiao Gu, Meiyu Li, Rui Liu, Yangyang Dong, Zhen Ma, Yaxin Chen, Xingfu Tang
Summary: This study proposes a frontier band orbital descriptor that rationalizes catalytic activity trends over a series of perovskite oxides, providing a promising strategy for designing optimal semiconducting metal oxide catalysts.
Article
Chemistry, Multidisciplinary
Rui Liu, Weiye Qu, Xiaolei Hu, Junxiao Chen, Yangyang Dong, Dongrun Xu, Jing Liu, Zhen Ma, Xingfu Tang
Summary: The valence state of single Au atoms anchored on CeO2(100) can be tuned to enhance the CO oxidation activity of Au-1/CeO2(100) by one order of magnitude. This work is significant for understanding reaction mechanisms and designing high-performance catalysts.
CHEMICAL COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Su Liu, Lin Zhang, Haibo Zhou, Zhen Ma, Yangdong Wang
Summary: The type of surfactant used significantly affects the properties and catalytic performance of Mo-Co-K sulfide catalysts, with the cationic surfactant CTAB enhancing the activity of the catalyst in CO2 hydrogenation reaction.
CHEMICAL ENGINEERING JOURNAL ADVANCES
(2022)
