Article
Chemistry, Physical
R. D. Kerkar, A. Salker
Summary: The silver and rhodium binary precious metals added composite oxide shows promising effect in achieving 100% conversion of NO and CO at significantly low temperature of 150 degrees C. The mesoporous structure composed of active nano-particles enhances oxygen mobility and CO reactivity on catalyst surface, demonstrating good synergy between active Ag-Rh pairs in catalytic enhancement.
CATALYSIS COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Md Robayet Ahasan, Yifan Wang, Ruigang Wang
Summary: Gas adsorption-desorption processes on oxide supported metal catalysts are critical for understanding catalytic CO oxidation mechanism. This study investigates the relationship between support structure and catalytic activity of CuOx supported on SiO2 and CeO2 nanorods and nanocubes. It was found that both Cu+/Cu2+ redox pair and lattice oxygen of CeO2 from different crystal planes play important roles in CO oxidation. The CeO2 nanorods with high surface defects promote CO adsorption and oxidation, leading to high catalytic performance for CO oxidation.
MOLECULAR CATALYSIS
(2022)
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
Chemistry, Physical
Lohit Sharma, John P. Baltrus, Srinivas Rangarajan, Jonas Baltrusaitis
Summary: Initiated by incipient wetness impregnation, dispersed tin atoms were deposited on gamma-Al2O3. Various characterization techniques were used to analyze the morphology and structure of the catalysts, revealing isolated and well-dispersed Sn oxide sites at relatively high coverages. The study suggests that active catalytic sites during propane dehydrogenation involve Al2O3 rather than bulk sulfide and Sn atoms dispersed over alumina.
APPLIED SURFACE SCIENCE
(2022)
Article
Energy & Fuels
Zhi-Ming Shen, Xiao-Jing Luo, Yan-Yan Zhu, Yong-Sheng Liu
Summary: In this study, 3-D nanosheets of NiO-CoO and PPy composite materials are successfully synthesized on the surface of carbon cloth as a supercapacitor electrode using facile AC co-electrodeposition method. The electrode exhibits excellent specific capacitance and cyclic stability, while the asymmetric supercapacitor assembled with this electrode shows high energy density.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Environmental Sciences
Nawel Jraba, Thabet Makhlouf, Gerard Delahay, Hassib Tounsi
Summary: The study involves the preparation and characterization of copper-loaded eta-alumina catalysts with different copper contents for catalytic reactions. Experimental results indicate that the impregnation/evaporation method is beneficial for highly dispersed copper oxide species on the surface at low copper contents. Wet impregnation allows for a well dispersion of copper species on the alumina surface for low copper contents, leading to similar catalytic performance in the selective catalytic oxidation of NH3.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Alaa Fahmy, Ahmed M. Saeed, Usama Dawood, Hassan Abdelbary, Korinna Altmann, Andreas Schoenhals
Summary: Nowadays, sensors based on polymers/nanostructured metal oxide composites have been extensively investigated due to their sensitivity to NO2 gas at ambient temperature. In this study, nanocomposite membranes of xanthan gum (XG) with different contents of MnO2 nanoparticles were prepared as a potential NO2 gas sensor operating at room temperature. The results showed that XG/MnO2 nanocomposite membranes have promising potential for applications in NO2 gas sensing.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Tiancheng Li, Laishi Li, Junkai Wang, Yusheng Wu, Yuzheng Wang, Mingchun Li
Summary: Selective catalytic reduction of nitrogen oxides using carbon monoxide is a promising technology with a series of advantages. In this study, three alpha-Fe2O3 catalysts for CO-SCR were prepared by different methods and characterized. The results showed that the catalytic efficiency of all three catalysts increased with increasing temperature and reached 100% conversion rate at temperatures above 250 degrees C. Among them, the Fe2O3-HT catalyst prepared by the hydrothermal method exhibited the best catalytic efficiency for NO, followed by the precipitation method, while the sol-gel method showed the worst catalytic efficiency. The superior performance of Fe2O3-HT can be attributed to its higher crystallinity and surface Fe3+ content.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Shahid Manzoor Wani, Babar Ahmad, Sheikh Shahid Saleem
Summary: In this study, Ni-Co-BN coatings were deposited on Aluminium-Silicon using the PVD technique and their composition and morphology were investigated. Mechanical and nano-wear studies were conducted to understand the effect of load on reduced modulus, hardness, and wear rate of the coating. The results showed a decrease in reduced modulus and hardness with increasing load, while the wear rate increased. The smooth wear scars on the coated material suggested its suitability for bearing applications.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Applied
Kakuya Ueda, Masashi Tsuji, Junya Ohyama, Atsushi Satsuma
Summary: Cobalt spinel oxides with octahedral (Oh) and tetrahedral (Td) sites show high activity in NO reduction by CO. By studying cobalt spinel oxides with different CoOh/CoTd ratios, it was determined that the octahedral site is responsible for the NO-CO reaction. In-situ XAFS measurements revealed that cobalt spinel oxides with higher CoOh fraction are more easily reduced by CO, leading to higher activity in NO reduction by CO.
Article
Chemistry, Physical
Yong Yuan, Raul F. Lobo, Bingjun Xu
Summary: Determining the structure of Ga-containing catalytic sites in Ga/H-ZSM-5 catalyst for propane dehydrogenation (PDH) has been a challenge due to the complexity of the system. In this study, two types of Ga species were differentiated using quantitative pulse titration reactions. The highly active divalent Ga species, identified as Ga2O22+, showed at least 18 times higher PDH activity than isolated Ga+ species. Additionally, only 30% of the observed Al pair sites were able to stabilize Ga2O22+, providing a method to probe the distribution of Al in zeolites.
Article
Chemistry, Applied
Thomas Allguren, Klas Andersson, Andrew Fry, Eric G. Eddings
Summary: This study investigated the combustion behavior of biomass with different pre-treatments and studied the formation of NOx in co-firing experiments. The results showed that the amount of fuel-bound nitrogen in coal is higher than that in biomass fuels, resulting in higher NO formation. Further analysis revealed that the distribution of volatile nitrogen species varied in the biomass co-firing cases, which was suggested as the main reason for the observed difference in NO formation.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Ping Wang, Xiaoling Mou, Yong Li, Wenjie Shen
Summary: A synthetic strategy for preparing fibrous-like green rusts by using appropriate balancing anions in ethylene glycol was reported. The green rusts can be converted into hematite with fibrous- or plate-like shapes upon thermal activation. The fibrous-like Fe2O3 exhibited higher catalytic activity and structural robustness compared to the plate-like analogue.
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
P. Vahdatkhah, O. Voznyy, S. K. Sadrnezhaad
Summary: The reversibility of anionic and cationic redox in Co-free concentration-gradient LLO was improved by integrating oxygen vacancies and high Ni/Mn ratio on LLO's surface, resulting in enhanced capacity of the cathode. This work provided a practical approach for resolving the capacity decay of Co-free LLOs by engineering the cathode/electrolyte interface and structure.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Multidisciplinary
Xue Bian, Hanying Jia, Ming Cai, Peng Cen, Yuting Bai, Wenyuan Wu
Summary: The study of CeO2-Fe2O3 catalysts showed that the addition of CeO2 reduced the reaction temperature and improved NO conversion. With increasing Ce/Fe ratio, the main phase of the catalyst transformed gradually from iron oxide to ceria, and the specific surface area increased, enhancing the redox capacity and adsorption properties. The in situ infrared surface catalyst reaction involved a combination of the Langmuir-Hinshelwood mechanism and the Eley-Rideal mechanism, which improved denitration performance.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Environmental Sciences
M. S. Fal Desai, R. D. Kerkar, A. V. Salker
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2019)
Article
Chemistry, Physical
Rahul D. Kerkar, Mithil S. Fal Desai, Arun V. Salker
SURFACE AND INTERFACE ANALYSIS
(2018)
Article
Chemistry, Physical
R. D. Kerkar, A. Salker
Article
Environmental Sciences
Rahul D. Kerkar, Arun Salker
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
R. D. Kerkar, A. V. Salker
MATERIALS CHEMISTRY AND PHYSICS
(2020)
Article
Chemistry, Physical
R. D. Kerkar, A. Salker
Summary: The silver and rhodium binary precious metals added composite oxide shows promising effect in achieving 100% conversion of NO and CO at significantly low temperature of 150 degrees C. The mesoporous structure composed of active nano-particles enhances oxygen mobility and CO reactivity on catalyst surface, demonstrating good synergy between active Ag-Rh pairs in catalytic enhancement.
CATALYSIS COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
R. D. Kerkar, A. Salker
Summary: The Co-Cu-Mn mixed oxide spinel was synthesized and characterized, with the Co-Cu-10Mn catalyst showing high CO conversion rate at low temperature and good stability over 6 hours of testing.
APPLIED NANOSCIENCE
(2021)
Article
Chemistry, Multidisciplinary
R. D. Kerkar, A. Salker
Summary: Simultaneous conversion of NO and CO is crucial for maintaining air purity, and we have developed a cost-effective catalyst composed of Co-Cu-Mn that achieves 100% conversion at a low temperature. Our study suggests that the excellent performance of the catalyst can be attributed to the synergistic interaction between CuO species formed in the composite material, which creates a dual surface for NO and CO conversion.
NEW JOURNAL OF CHEMISTRY
(2022)
