Article
Chemistry, Physical
Satoshi Hinokuma, Takeshi Iwasa, Yoshihiro Kon, Tetsuya Taketsugu, Kazuhiko Sato
Summary: This comprehensive study investigated the effects of support materials and Ir loading on the catalytic N2O decom-position properties, revealing a close relationship between decomposition activity and Ir dispersion. The correlation between adsorption properties of N2O/NOx and the catalytic N2O decomposition activity was also demonstrated through NO-TPD profiles and in situ FTIR spectra.
CATALYSIS COMMUNICATIONS
(2021)
Article
Engineering, Environmental
Ye Li, Xinping Wang, Chuan Shi
Summary: A series of Ba-Ce-Cu catalysts were prepared by the citric acid method and used for N2O decomposition. The doping effects of Ba and Ce on CuO were studied. It was found that the activity and tolerance of the catalyst to impurity gases can be effectively modified by the doping components. Ba0.2Cu displayed high activity due to the stabilizing effect of Ba on the active Cu+ species, while Ba0.2Ce0.5Cu exhibited higher catalytic activity and strong tolerance to NO, thanks to the synergistic effect of Ba and Ce and the ability of CeO2 to remove NOx species.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Review
Engineering, Environmental
Young-Kwon Park, Beom-Sik Kim
Summary: Ammonia is a promising fuel candidate with reliable combustion properties and potential for mass production from renewable resources. However, its combustion releases high levels of NOx emissions, posing air quality and health problems. This review explores recent studies on mitigating NOx emissions from ammonia combustion processes and comprehensively scrutinizes catalytic deNOx technologies.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Tanya Tsoncheva, Consolato Rosmini, Mihail Mihaylov, Jiri Henych, Kristina Chakarova, Nikolay Velinov, Daniela Kovacheva, Zuzana Nemeckova, Martin Kormunda, Radostina Ivanova, Ivanka Spassova, Konstantin Hadjiivanov
Summary: In this study, the effects of the Fe/Ce ratio and the calcination temperature of cerium-iron oxides on Nickel-decorated mesoporous cerium-iron oxide composites were investigated. The research delves into the complex role of the FeCe support in the reaction mechanism.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Environmental
Dongxu Cui, Shiliang Wu, Tao Li, Yuxin Zhang, Sang Jun Yoon, Youn-Sang Bae, Bugae Park, Yinlong Wu, Rui Xiao
Summary: A novel gas-solid phase fluidized bed catalytic electrode was proposed for N2O decomposition in a solid oxide fuel cell (SOFC) system. By using cerium oxide particles coated with lanthanum, strontium, and iron (CeO2-LSF) as the fluidized bed material, N2O conversion rate reached 99.78% at 720 degrees C. Assisting particle fluidization with argon led to a maximum improvement of 39.86% in peak power density at 670 degrees C compared to the fixed bed electrode. Furthermore, the maximum temperature difference inside the reactor decreased significantly from 92 degrees C to 42 degrees C when the cathode particles were fluidized.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Physical
Yong Zhang, Zhigao Tian, Lin Huang, Honghong Fan, Qiufei Hou, Ping Cui, Wanqiang Wang
Summary: This review provides an overview of noble metal-based catalysts used in the direct catalytic decomposition of N2O, with a focus on recent advances. The review discusses various factors that influence the catalyst performance, such as catalyst supports, preparation methods, additives, and impurity gases. Additionally, future trends in catalyst systems for the direct catalytic decomposition of N2O are also discussed.
Article
Chemistry, Physical
Fan Lin, Tahrizi Andana, Yiqing Wu, Janos Szanyi, Yong Wang, Feng Gao
Summary: N2O decomposition on Cu, Co, and Fe-exchanged SSZ-13 zeolite catalysts follows a dual-site mechanism or a single-site mechanism. The reaction is limited by N-O cleavage under low pressure and first-order kinetic regime. Fe-SSZ-13 exhibits lower activation barriers, leading to a higher N2O decomposition rate.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Jinru Sun, Aolei Song, Yu Tian, Hua Zhan, Jianlin Deng, Hong Wang, Ming Ke
Summary: In this study, the effect of alkali metal deposition on the activity of x-Co3O4 catalysts for the N2O catalytic decomposition was investigated. The results showed that the deposition of alkali metal Na improved the activity of the Na-Co3O4 catalyst, while the deposition of other alkali metals suppressed the catalytic decomposition of N2O. Characterization analysis indicated that the deposition of alkali metals did not change the morphology and structure of the catalysts but affected the chemical environment around the Co ion.
Article
Environmental Sciences
Ying Xiong, Yumei Zhao, Weijun Shan, Xiaogeng Feng, Junshuo Cui, Zhenning Lou, Guoxiang Shao, Min Dong, Haibiao Yu
Summary: Introducing K as a promoter on the Gd0.06Co catalyst significantly enhances its catalytic activity for N2O decomposition and lowers the temperature required for complete N2O decomposition. The optimized catalyst K0.025Gd0.06Co shows superior catalytic performance mainly due to the synergistic effect of Gd and K, resulting in an increase in oxygen vacancies on the catalyst surface. Even in the presence of impurity gases, K0.025Gd0.06Co exhibits significantly better catalytic activity compared to Gd0.06Co and K0.025Co catalysts.
Article
Engineering, Chemical
Phuoc Hoang Ho, Katarzyna Swirk Da Costa, Giancosimo Sanghez de Luna, Magdalena Jablonska, Francesca Ospitali, Francesco Di Renzo, Gerard Delahay, Giuseppe Fornasari, Angelo Vaccari, Regina Palkovits, Patricia Benito
Summary: This study demonstrates a simple and reproducible method to prepare Co3O4 coated on metallic foams and investigates its catalytic performance in the decomposition of N2O. The obtained structured catalysts show stable performance and lower pressure drop compared to combustion or precipitated catalysts.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Biotechnology & Applied Microbiology
Behrouz Bozorgi, Javad Karimi-Sabet, Parisa Khadiv-Parsi
Summary: Using promoters to improve catalytic activity is an efficient method in chemical and industrial applications. This paper comprehensively examines the effects of impregnation method and alkali metals on the decomposition of N2O using a series of 1%wt Pt-M/SiO2 (M=Na, K, and Cs) catalysts. The catalysts were characterized using various techniques to analyze their physical and chemical properties and their relationship with catalytic activity. The results show that sodium and cesium reduce the conversion rate, while potassium exhibits promotional characteristics. Electron donation, facilitation of oxygen surface diffusion, and uniform distribution of KOx clusters are significant factors in improving the catalyst's reactivity.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
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
Chemistry, Physical
Maxim Zabilskiy, Iztok Arcon, Petar Djinovic, Elena Tchernychova, Albin Pintar
Summary: The study found that Cu2+/Cu+ and Ce4+/Ce3+ ionic pairs play dynamic and crucial roles in the N2O decomposition reaction, with the initial formation of reduced Cu+ and Ce3+ species during activation process. The concentration of these species significantly decreases during the steady-state reaction. The copper-ceria interface plays a crucial role in mediating electron and oxygen transfer during the catalytic reaction.
Article
Chemistry, Physical
Eugenio Meloni, Marco Martino, Simona Renda, Olga Muccioli, Pluton Pullumbi, Federico Brandani, Vincenzo Palma
Summary: This study focused on developing catalysts active in higher concentrations of N2O, up to 20 vol%, both in powder form and in structured configurations suitable for industrial application. Nickel-cobalt mixed oxides were found to be excellent catalysts for N2O decomposition, with total N2O conversion and selectivity towards N-2 and O-2 achieved at 510 degrees C by feeding 20 vol% of N2O, showing promise for industrial applications.
Article
Chemistry, Multidisciplinary
Seongmin Choi, Ki Bok Nam, Heon Phil Ha, Dong Wook Kwon
Summary: Cu supported on Ce-Y via CeO2-Y2O3 solid solution was reformed to improve the activity in catalytic N2O decomposition. Cu/Ce0.5Y0.5 achieved the highest activity. The number of accessible sites and oxygen vacancies increased with Y species loading, but the activity of Cu/Ce0.1Y0.9 decreased due to the difficulty of releasing O2.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Wenjie Sun, Yijia Huang, Xiaomin Li, Zhen Huang, Hualong Xu, Wei Shen
Summary: Cu-CeOx-MOF catalysts with well-dispersed Cu in different contents were synthesized via the ethylenediaminetetraacetic acid (EDTA) grafting method, with Cu-CeOx-MOF-0.2 showing outstanding catalytic activity and stability, as well as better low-temperature reducibility.
Article
Nanoscience & Nanotechnology
Kaiwen Zha, Huimin Liu, Linshuang Xue, Zhen Huang, Hualong Xu, Wei Shen
Summary: The one-dimensional cowpea-like catalysts Co/SiO2-N demonstrated higher catalytic efficiency and stronger resistance to alkali metal poisoning, thanks to the confined effects and shielding effects provided by the amorphous SiO2 shell.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Yue Fang, Haibing Sheng, Zhen Huang, Yinghong Yue, Weiming Hua, Wei Shen, Hualong Xu
Summary: A synergetic dual-oxide/zeolite catalyst was developed to achieve high selectivity and stability by tuning the coupling between CO and H-2 activation through active H species migration. The optimized catalyst exhibited excellent catalytic performance with high aromatics selectivity and stability.
Article
Engineering, Chemical
Haibing Sheng, Yue Fang, Yijia Huang, Zhen Huang, Wei Shen, Hualong Xu
Summary: Syngas can be converted into value-added aromatics, but achieving high efficiency and selectivity remains a challenge. Impregnation of copper on specific catalysts can improve the reaction efficiency and product selectivity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Kaiwen Zha, Shipeng Wu, Zihao Zheng, Zhen Huang, Hualong Xu, Wei Shen
Summary: In this study, a series of treated halloysite-supported Fe-modified Co oxide catalysts were prepared, and it was found that the catalysts with 15 wt% Co loading and 2 wt% Fe modifications showed the best catalytic activity and tolerance to SO2 poisoning. The introduction of Fe not only improved the catalyst activity but also enhanced the tolerance to SO2 poisoning.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Shipeng Wu, Huimin Liu, Zhen Huang, Hualong Xu, Wei Shen
Summary: In this study, a facile solvent-thermal-reduction strategy was used to fabricate an O-vacancy-rich porous MnO2 nanosheet catalyst (MnO2-PS) for propane catalytic oxidation. The catalyst exhibited improved redox ability and oxygen activation capacity, which accelerated the oxidation of light alkanes. Additionally, the catalyst possessed highly accessible surface and high density of exposed active sites, facilitating the adsorption and activation of reactant molecules.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Environmental
Shipeng Wu, Huimin Liu, Zhen Huang, Hualong Xu, Wei Shen
Summary: In this study, a Mn1ZrxOy mixed oxide catalyst was developed through Zr doping for low-temperature catalytic oxidation of propane. The results showed that Zr doping significantly enhanced the catalytic activity of MnO2, as it led to higher redox ability and oxygen mobility, more oxygen vacancies, and enhanced acidity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Yijia Huang, Desheng Xiong, Shipeng Wu, Zhen Huang, Wei Shen, Hualong Xu
Summary: Selective oxidation of higher alcohols to carbonyls is an important chemical transformation in research and industry. A nanorod-like Mo-VOx catalysts with high catalytic activity and selectivity was synthesized in this study. The methyl pyruvate selectivity reached 79.6% at a relatively low reaction temperature of 180 degrees C with 90.1% conversion. The catalysts showed a nanorod-like morphology with larger specific surface area and smaller crystalline size, and generated active MoV2O8 crystalline phase and surface oxygen species.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Huimin Liu, Shipeng Wu, Chao Sun, Zhen Huang, Hualong Xu, Wei Shen
Summary: Support properties regulation has been an effective method for improving noble metal catalytic performance. However, synthesizing a uniform TiO2-CeO2 solid solution in Pd-based catalysts is still challenging due to the discrepancy in solubility product constant between titanium and cerium hydroxides. In this study, an in situ capture strategy was used to fabricate a uniform TiO2-CeO2 solid solution, which served as a support for an enhanced Pd-based catalyst. The resulting catalyst exhibited superior CO oxidation activity and stability, showcasing the potential of this strategy for fabricating advanced noble metal-based catalysts.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Linshuang Xue, Chenyi Yuan, Shipeng Wu, Zhen Huang, Zhen Yan, Stephane Streiff, Hualong Xu, Wei Shen
Summary: Coalbed methane is a significant contributor to atmospheric methane, a potent greenhouse gas that contributes to global warming. Therefore, it is crucial to remove methane in coalbed gas before emission. The use of economically viable non-noble metal catalysts for catalytic methane combustion (CMC) is being explored to mitigate the greenhouse effect caused by low-concentration methane emissions. In this study, Mn-doped Co3O4 catalysts were synthesized using an environmentally friendly solid-state method. The Mn0.05Co1 catalyst exhibited the best CMC activity (T-90 = 370°C) and good moisture tolerance (3 vol% steam). The introduction of an appropriate amount of manganese resulted in lattice distortion and the transformation of Co3+ to Co2+, leading to the generation of more active oxygen vacancies. Mn0.05Co1 also showed better reducibility and oxygen mobility. In situ studies revealed that methane was adsorbed and oxidized more easily on Mn0.05Co1, which explains its superior catalytic performance.
Article
Chemistry, Applied
Xiao Zhang, Chenyi Yuan, Zhen Huang, Hualong Xu, Wei Shen
Summary: Thermo-catalytic CO2 hydrogenation with renewable energy has emerged as a promising alternative for producing bulk chemicals. The oxide-zeolite (OX-ZEO) bifunctional catalysts have gained attention due to their high selectivity in product formation. However, the design of effective catalysts is challenging due to the requirement for multifunctional active sites, complex tandem cascade reactions, and limited understanding of reaction mechanisms.
Article
Chemistry, Physical
Zihao Zheng, Shipeng Wu, Zhen Huang, Hualong Xu, Wei Shen
Summary: A series of sulfated ceria-zirconia composite oxides (CeZrOx) supported platinum catalysts (Pt/CeZr-S) were prepared using a support sulfation strategy, which exhibited significantly enhanced catalytic activity and higher tolerance to SO2 poisoning.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Physical
Huimin Liu, Chenyi Yuan, Shipeng Wu, Chao Sun, Zhen Huang, Hualong Xu, Wei Shen
Summary: In this study, a nanoflower-like TiO2-supported Pd catalyst was developed with a higher concentration of oxygen vacancies and surface hydroxyl groups. The distinctive structure of the nanoflower-like TiO2 resulted in improved dispersion and stabilization of Pd species, as well as the activation of CO and O-2 molecules. As a result, the catalyst exhibited remarkable efficiency and stability in low-temperature CO oxidation reaction.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Yue Fang, Zhen Huang, Sheng Wang, Haibing Sheng, Weiming Hua, Yinghong Yue, Wei Shen, Hualong Xu
Summary: The combination of CTAB pretreated ZSM-5 and ceria-zirconia solid solution (CZS) as a bifunctional catalyst shows promising results in syngas conversion to light aromatics, with enhanced selectivity and minimized side reactions.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Chao Sun, Guangfeng Wei, Huimin Liu, Zhen Huang, Feng Qin, Haitao Wang, Jing Zhao, Zhipan Liu, Linjuan Zhang, Haisheng Yu, Binghui Ge, Wei Shen, Hualong Xu
Summary: A TiO2-Pt-1-CeO2 ensemble with unprecedented reactivity was constructed using the phase junction confinement principle, enabling high efficiency in CO oxidation through weakened CO affinity, enhanced surface lattice oxygen reactivity, and lowered reaction barrier. This work demonstrates a plausible synthesis philosophy and reaction mechanism for SACs, creating a new frontier in reactivity.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
