Article
Chemistry, Physical
Md Nur Alam Mondal, Nader Karimi, S. David Jackson, Manosh C. Paul
Summary: The premixed combustion of hydrogen/air over a Pt catalyst in a planar channel burner was numerically investigated. The aim was to stabilize the flame at lean to ultra-lean conditions. A species transport model with heterogeneous and homogeneous chemical reaction schemes was used and validated against experimental results. The study found that with the Pt catalyst coated on the walls, complete H2 combustion is achieved within a certain range of equivalence ratios and the contribution of gas phase reactions increases with Reynolds number. The presence of radiation affects combustion kinetics and flame temperature, while NOx emission increases with equivalence ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Environmental
Chunmiao Jia, Jiajian Gao, Kuniadi Wandy Huang, Vishal Jose, Prapisala Thepsithar, Jong-Min Lee
Summary: CuO/γ-Al2O3 catalyst showed excellent catalytic activity in methanol-SCR process, efficiently removing NOx without deactivation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Atsuko Tomita, Ryutaro Wakabayashi, Tatsuo Kimura
Summary: We propose a catalytic conversion system to reduce air pollution by alternating between combustion gas containing NOx and a reduction gas without NO/O-2. This system can convert solid-state nitrate into gaseous NH3 under ambient pressure, which could be beneficial for solving the nitrogen crisis and constructing a circular nitrogen economy.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Shuang Liu, Yan Huang, Shanshan Li, Qingjin Lin, Jianli Wang, Shaohua Xie, Fudong Liu, Haidi Xu, Yaoqiang Chen
Summary: A W/CZ catalyst with a pyrochlore structure was successfully developed, showing excellent NOx adsorption-storage ability below 180°C and superior NH3-SCR activity above 180°C. The pyrochlore structure increased oxygen vacancies and enhanced redox property, significantly promoting NOx adsorption-storage at low temperature and improving NH3-SCR performance.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Renyi Xie, Lei Ma, Kai Sun, Gang Zhou, Zan Qu, Naiqiang Yan
Summary: Sulfated CeO2 cubes exhibited improved catalytic performance in NH3-SCR due to the increased Bronsted acid sites created by surface sulfates, which facilitated ammonia adsorption and activation. The presence of sulfates on CeO2 cubes did not significantly alter the crystal structures, and gaseous phase NO was identified as the rate-determining step in the SCR reaction over sulfated CeO2 cubes.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Applied
Sotirios A. Malamis, Michael P. Harold
Summary: The study examines the performance of different catalyst configurations in trapping, releasing, and converting NOx, C-12, and C3H6 at low temperatures. The Pd/SSZ-13 -> Pt + Pd/BEA sequential configuration is the most effective in simultaneously trapping C-12 and NO, with excellent storage below 100 degrees C and release/conversion above 200 degrees C.
Article
Engineering, Environmental
Yeji Choi, Ki Bong Lee
Summary: The K-promoted mixed metal oxides prepared from Co-Mg-Al hydrotalcite-like compounds showed enhanced NOx adsorption performance due to the generation of active oxygen species and direct adsorption of NOx at high temperatures.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
S. Ecker, J. Dornseiffer, J. Werner, H. Schlenz, Y. J. Sohn, F. S. Sauerwein, S. Baumann, H. J. M. Bouwmeester, O. Guillon, T. E. Weirich, W. A. Meulenberg
Summary: Low-temperature NOx storage materials based on nanocomposites containing perovskite-type oxides were prepared with different loadings in porous alumina. Zr showed higher NOx storage capacities at high loadings, while hydrothermal ageing resulted in a decrease in NSC for some storage materials.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Yanke Yu, Mengqiao Geng, Desheng Wei, Chi He
Summary: Selective catalytic oxidation of NH3 (NH3-SCO) is a promising method to reduce NH3 pollution. The addition of CuSO4 can enhance the N-2 selectivity in the catalyst.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Engineering, Environmental
Yang Xu, Xiaofeng Wang, Mengyue Qin, Qingbo Li
Summary: This review discusses the reaction mechanism and SO2/H2O poisoning in CH4-SCR, highlighting the importance of active sites, oxygen, and intermediate species. It also provides a comprehensive overview of representative metal-exchanged zeolite catalysts and proposes strategies for improving SO2/H2O tolerance and low-temperature catalytic activity through the introduction of a second metal and reducing agent. Suggestions for future studies are also presented.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Yuqing Pan, Na Li, Ke Li, Shiyuan Ran, Chenyang Wu, Qulan Zhou, Jiyuan Liu, Shuzhou Li
Summary: This study reports a Fe2O3/amorphous SiO2 catalyst with high low-temperature activity for CO-SCR. Experiments and density functional theory (DFT) calculations provide direct evidence that an optimal content of oxygen vacancy enhances the low-temperature NO conversion ratio and N2 selectivity of Fe2O3-based catalyst. Compared with conventional defect engineering, the alpha-Fe2O3 (1 1 0) facet enables an oxygen vacancy generation-filling cycle in the CO-SCR reaction, following Mars-van Krevelen (MvK) mechanism.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Yeji Choi, Hyeonjung Jung, Suji Kim, Jeong Woo Han, Ki Bong Lee
Summary: This study investigates the structural changes and NOx adsorption properties of Co-containing hydrotalcite-based mixed oxides using experiments and density functional theory (DFT) calculations. The results show that low-temperature calcination of the hydrotalcite-like compounds is beneficial for NOx uptake, while high-temperature calcination decomposes the spinel phases and decreases the amount of Co3+ ions on the surface. DFT calculations further confirm the favorable adsorption of NO molecules on the spinel phases.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Applied
Dongyue Zhao, Yuexi Yang, Zhongnan Gao, Ye Tian, Jing Zhang, Zheng Jiang, Xingang Li
Summary: The study demonstrates that the A-site defective perovskite catalyst exhibits higher De-NOx performance and can be more efficiently regenerated as NOx storage sites at low temperatures.
JOURNAL OF RARE EARTHS
(2021)
Article
Chemistry, Physical
Qiuzhun Chen, Dong Wang, Chuan Gao, Bin Wang, Shengli Niu, Gaiju Zhao, Yue Peng, Junhua Li, Chunmei Lu, John Crittenden
Summary: Activated red mud (RM) showed potential for selective catalytic reduction (SCR) of NOx, but its low reducibility and acidity constrained its low-temperature activity. In this study, cerium-tungsten oxide was used to reconfigure the redox and acid sites of RM-based catalyst, resulting in a high NOx conversion at temperatures ranging from 219 to 480 degrees C. The presence of Ce3+/Ce4+ redox pairs enhanced the adsorbed oxygen and promoted redox reactions, while positive interactions between Ce, W species, and Fe oxide facilitated the activation of NH3 species. The reconfigured catalyst provided abundant Brt nsted and Lewis acid sites, promoting the SCR reaction through Langmuir-Hinshelwood and Eley-Rideal mechanisms.
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Chemistry, Physical
Xiangyu Liu, Penglu Wang, Yongjie Shen, Shanyuan Bi, Wei Ren, Dengsong Zhang
Summary: In this study, SO2-tolerant selective catalytic reduction (SCR) of NOx was achieved by sulfur doping and utilizing Ce4+-SO42- pair sites on CeO2 catalysts for the selective adsorption and activation of reactants. Sulfur doping induced charge-deficient neighboring Ce atoms, weakening the electronic interaction between CeO2 and SO2 as well as the oxidation capacity of CeO2 catalysts, resulting in the suppression of adsorption and oxidation of SO2. Meanwhile, it also alleviated the oxidation of NO, generating SCR reactive NO2/nitrite species accompanied by increased Bronsted acid sites over Ce4+-SO42- pair sites.
Article
Chemistry, Physical
Bolun Yu, Denan Li, Qianqian Zhu, Shufan Yao, Lifeng Zhang, Yanshuo Li, Zhenxin Zhang
Summary: This study successfully improved the catalytic activity of a zeolitic octahedral metal oxide by incorporating a single zinc species into its micropore. The zinc incorporation achieved a high ethane conversion rate and ethylene selectivity. Mechanism study showed that the isolated zinc site played a crucial role in activating oxygen and ethane, as well as stabilizing intermediates and transition states.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Ruoqi Liu, Hao Fei, Jian Wang, Ting Guo, Fangyang Liu, Zhuangzhi Wu, Dezhi Wang
Summary: This work successfully synthesized a high-performing S-enriched MoS2 catalyst for electrocatalytic nitrogen reduction reaction (NRR), demonstrating high activity and selectivity. The synergistic effect of the 1T phase and bridging S22- species was shown to play a positive role in NRR performances, and DFT calculations revealed the mechanism behind the improved performance.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Pan Xia, Lele Zhao, Xi Chen, Zhihong Ye, Zhihong Zheng, Qiang He, Ignasi Sires
Summary: This study presents a modified gas-diffusion electrode (GDE) for highly efficient and stable H2O2 electrosynthesis by using trace polymethylhydrosiloxane (PMHS). DFT calculations provide an in-depth understanding of the roles of PMHS functional groups.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Kwangchol Ri, Songsik Pak, Dunyu Sun, Qiang Zhong, Shaogui Yang, Songil Sin, Leliang Wu, Yue Sun, Hui Cao, Chunxiao Han, Chenmin Xu, Yazi Liu, Huan He, Shiyin Li, Cheng Sun
Summary: Different B-doped rGO catalysts were synthesized and their 2e- oxygen reduction reaction (ORR) performance was investigated. It was found that the 2e- ORR selectivity of B-doped rGO was influenced by the B content and oxygen mass transfer conditions. The synthesized catalyst exhibited high 2e- ORR selectivity and was capable of degrading organic pollutants continuously.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Li Lv, Lin Lei, Qi-Wen Chen, Cheng-Li Yin, Huiqing Fan, Jian-Ping Zhou
Summary: Monoclinic phase La2Ti2O7 and orthorhombic phase Bi4Ti3O12 are widely used in photocatalysis due to their layered crystal structure. The electronic structures of these phases play a crucial role in their photocatalytic activity. Heat treatment in a nitrogen atmosphere introduces more oxygen vacancies into the S-scheme heterojunction, leading to enhanced NO removal efficiency.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Choe Earn Choong, Minhee Kim, Jun Sup Lim, Young June Hong, Geon Joon Lee, Keun Hwa Chae, In Wook Nah, Yeomin Yoon, Eun Ha Choi, Min Jang
Summary: In this study, the synergistic effect between argon-plasma-system (AP) and catalysts in promoting the production of reactive species for water remediation was investigated. By altering the oxygen vacancies concentration of CeO2/Bi2O3 catalyst, the production of hydrated electrons was stimulated for PFOA removal. The results showed that the built-in electric field in the Bi/Ce0.43 interface enhanced electron migration and eaq- generation, leading to improved PFOA removal efficiency.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Yushan Wu, Di Xu, Yanfei Xu, Xin Tian, Mingyue Ding
Summary: Efficient synthesis of primary amines from carbonyl compounds was achieved via reductive amination using Ru@NC-Al2O3 as a catalyst, exhibiting high activity and selectivity under mild conditions.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Yilan Jiang, Peifang Wang, Tingyue Chen, Keyi Gao, Yiran Xiong, Yin Lu, Dionysios D. Dionysiou, Dawei Wang
Summary: By controlling the content of Co and Ni in Co1-xNixFe2O4, the production of O-1(2) from H2O2 can be regulated. NiFe2O4, with the lowest lattice distortion degree, can efficiently produce O-1(2) as the dominant reactive oxygen species. The system also exhibits significant resistance to water matrix interference.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Shuai Feng, Donglian Li, Hao Dong, Song Xie, Yaping Miao, Xuming Zhang, Biao Gao, Paul K. Chu, Xiang Peng
Summary: In this study, MoO2/Mo2N heterostructures were prepared by regulating the coordination of Mo atoms. The electrocatalyst exhibits high current density and excellent stability for hydrogen evolution reaction.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Jia-Cheng E. Yang, Min -Ping Zhu, Daqin Guan, Baoling Yuan, Darren Delai Sun, Chenghua Sun, Ming-Lai Fu
Summary: This study successfully modulated the electron configuration and spin state of millimetric metal catalysts by adjusting the support curvature radius. The electronic structure-oriented spin catalysis was found to affect the degradation of pollutants, providing new insights for the design and production of highly active, reusable, and stable catalysts.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Tao Zhong, Su Tang, Wenbin Huang, Wei Liu, Huinan Zhao, Lingling Hu, Shuanghong Tian, Chun He
Summary: In this study, a highly efficient photocatalyst for the elimination of CH3SH was developed by engineering different crystal facets and coupling them with PHI. Cu (111)/PHI exhibited the highest elimination efficiency and showed good stability and reusability. The enhanced surface electron pump effect and effective adsorption mechanisms were revealed through comprehensive characterizations and DFT calculations.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Feifei Yang, Tianyu Zhang, Jiankang Zhao, Wei Zhou, Nicole J. Libretto, Jeffrey T. Miller
Summary: A Ni3Sn intermetallic nano particle was found to have geometrically isolated Ni sites that could selectively cleave C-O bonds in biomass derivatives. This nano particle showed high activity and selectivity towards 2-methylfuran, unlike Ni nanoparticles that produced other unwanted products derived from the aromatic rings.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2024)
Article
Chemistry, Physical
Lulu Qiao, Di Liu, Anquan Zhu, Jinxian Feng, Pengfei Zhou, Chunfa Liu, Kar Wei Ng, Hui Pan
Summary: This study reveals that surface evolution plays a crucial role in enhancing the electrocatalytic performance of transition metal oxides for electrochemical nitrate reduction reaction (e-NO3RR). Incorporating nickel into Co3O4 can promote surface reconstruction and improve the adsorption of intermediates and reduce energy barriers, leading to enhanced catalytic performance. The reconstructed cobalt-nickel hydroxides (CoyNi1_y(OH)2) on the catalyst's surface serve as the active phase.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2024)
Article
Chemistry, Physical
Xinyu Song, Yang Shi, Zelin Wu, Bingkun Huang, Xinhao Wang, Heng Zhang, Peng Zhou, Wen Liu, Zhicheng Pan, Zhaokun Xiong, Bo Lai
Summary: This study explores the discriminative activities and mechanisms for activation of O-O bond in peroxy compounds via single-atom catalysts (SACs) with higher coordination numbers (M-N5). The atomic catalyst (Fe-SAC) with Fe-N5 as the active center was constructed, effectively activating peroxymonosulfate (PMS), peroxydisulfate (PDS), and hydrogen peroxide (H2O2). The study demonstrates the degradation efficiencies of acyclovir are related to the O-O bond length in different peroxy compounds, and reveals the discriminative mechanisms for activation of O-O bond in different Fenton-like systems.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2024)
Article
Chemistry, Physical
Yangzhuo He, Hong Qin, Ziwei Wang, Han Wang, Yuan Zhu, Chengyun Zhou, Ying Zeng, Yicheng Li, Piao Xu, Guangming Zeng
Summary: A dual-metal-organic framework (MOF) assisted strategy was proposed to construct a magnetic Fe-Mn oxycarbide anchored on N-doped carbon for peroxymonosulfate (PMS) activation. The FeMn@NC-800 catalyst exhibited superior activity with almost 100% degradation of sulfamethazine (SMZ) in 30 minutes. The study provided insights for the rational design of high-performance heterogeneous catalysts and proposed a novel nonradical-based catalytic oxidation for environmental cleaning.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2024)