Article
Chemistry, Multidisciplinary
Yu Gao, Zhitao Han, Shaosi Cheng, Duo Xu, Xinxiang Pan
Summary: This study developed a novel mixed catalyst for the efficient removal of high-concentration NH3 in exhaust gas, and demonstrated the synergistic effect between VW/TiO2 and Pt/Al2O3 for superior catalytic performance at low temperatures.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Monika Fedyna, Bartosz Mozgawa, Filip Zasada, Kinga Gora-Marek, Joanna Grybos, Witold Piskorz, Chengyang Yin, Zhen Zhao, Piotr Pietrzyk, Zbigniew Sojka
Summary: Isotopic labeling experiments were conducted to investigate the SCR reaction over CuSSZ-13 zeolites. The reactions were characterized using various techniques, and the results were interpreted using DFT and thermodynamic modeling. The study revealed the temperature regions and identified the main processes and intermediates involved in different stages of SCR reactions. A 2D diagram was constructed to conceptualize the SCR reaction and rationalize the reaction mechanism.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Francesco Conte, Veronica Pellegatta, Antonio Tripodi, Gianguido Ramis, Ilenia Rossetti
Summary: The combination of LED lamp and silver-promoted TiO2 was found to be the most efficient way for the photo-oxidation of ammonium to molecular nitrogen, achieving a conversion rate of 48%. A lower conversion rate of approximately 40% was achieved with a more powerful UV lamp. While natural sunlight could reach over 38% conversion, the fluctuation of reaction conditions remains a critical issue.
Review
Engineering, Environmental
Fengyu Gao, Yuanyuan Liu, Zaharaddeen Sani, Xiaolong Tang, Honghong Yi, Shunzheng Zhao, Qingjun Yu, Yuansong Zhou
Summary: The article summarizes various NH3-SCO catalysts with promising potential to reduce NH3 emissions, classifying them based on N-2-selectivity at different temperatures. It specifically highlights several promising copper-based catalysts, discusses reaction paths of NH3-SCO catalytic oxidation products, and emphasizes the importance of controlling NH3 dehydrogenation pathways.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Seyedeh Fatemeh Hashemi, Samad Sabbaghi, Rahmatallah Saboori, Bahman Zarenezhad
Summary: This study explores the photocatalytic degradation of ammonia in an aqueous solution using titania nanoparticles. It is found that titania nanoparticles exhibit high photocatalytic activity under optimal conditions. The study also reveals that pH is the most influential factor in the photocatalytic degradation process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Geochemistry & Geophysics
Jadambaa Temuujin, Batmunkh Davaabal, Ulambayar Rentsennorov, Enkhtur Odbaatar, Dashnyam Enkhbayar, Tserendagva Tsend-Ayush, Sunjidmaa Danzandorj, Claus Henning Ruescher, Kenneth J. D. MacKenzie
Summary: This paper presents a comparative study of the properties of alkali-activated geopolymer materials prepared using ball-milled and attrition-milled fly ashes. The results showed that continuous attrition milling increased the surface area and reduced the particle size of the fly ash, resulting in improved compressive strength of the geopolymer paste compared to ball milling.
Article
Chemistry, Physical
Tobias Weissenberger, Ralf Zapf, Helmut Pennemann, Gunther Kolb
Summary: The catalytic combustion of hydrogen and ammonia-containing off-gas surrogate from an ammonia solid oxide fuel cell (SOFC) was studied. The results showed that the tested catalysts were able to completely convert hydrogen and ammonia present in the off-gas. The formation of nitrogen oxides (NOx) increased with reaction temperature and stagnated at temperatures of 600 degrees C and higher.
Article
Chemistry, Physical
Mengmiao Sun, Guanzheng Wu, Lei Dai, Martin Oschatz, Qing Qin
Summary: The conversion of low-cost and abundant precursor substances into value-added chemicals through electrochemical techniques is essential for establishing a renewable energy-chemistry cycle. This study presents the synthesis of free-standing Cu-MOF-based materials as NITRR catalysts, which exhibit remarkable NITRR performance and satisfactory half-cell energy efficiency. It can be driven by a solar cell under natural sunlight for continuous NH3 production.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Tao Chen, Huanhuan Dong, Tong Liu, Li Zhou, Dengjiang Fu, Beibei Pang, Jie Lian, Tao Ding, Wei Zhang, Rong He, Wenkun Zhu
Summary: In this study, a directional half-wave rectified alternating current electrochemical method was used to confine oxygen-rich uranium precursors over ultrathin 2D GO nanosheets, preparing uranium catalysts. The as-prepared uranium catalysts exhibited a considerable Faradaic efficiency of 12.7% for NH3 and an NH3 yield rate of 18.7 μgh(-1) mg(-1) for N-2 electroreduction. Operando XAS and isotope-labeling FTIR further revealed the preferred nitrogen adsorption reaction intermediate N-(2O(ax)-1 U-4O(eq)) and confirmed the key *N2Hy intermediate species derived from the fed N-2 gas. Theoretical simulations demonstrated that the U-O atomic interface originated from U 5f-O 2p orbital hybridization can accumulate partial charge from GO, facilitating N Ndissociation and reducing the thermodynamic energy barrier of the first hydrogenation step.
INORGANIC CHEMISTRY
(2023)
Article
Thermodynamics
Andrew Lock, Viv Bone
Summary: This study investigates the off-design performance of the supercritical CO2 recompression cycle and presents effective operating strategies to enhance its performance and flexibility.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Environmental
Zhao Jiaqi, Yuan Linjiang, Wang Yang
Summary: This study investigates the removal of ammonia nitrogen with the aid of sulfate in domestic wastewater treatment. The experimental results show that the desired reactions can be achieved in a specific reactor under certain conditions, and the presence of iron ions enhances the efficiency of ammonia removal.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Physical
Marzia Mureddu, Jose F. Bartolome, Sonia Lopez-Esteban, Maria Dore, Stefano Enzo, Alvaro Garcia, Sebastiano Garroni, Lorena Pardo
Summary: Lead-free (Ba0.92Ca0.08)(Ti-0.95 Zr-0.05) O-3 (BCZT) ceramics were successfully prepared using solid-state route and low-temperature synthesis. The activation and homogenization process significantly decreased the perovskite formation temperature. The elimination of secondary phases was achieved through a two-step sintering treatment, resulting in a pure phase BCZT ceramic with excellent electromechanical properties.
Article
Chemistry, Applied
Fei Wang, Zhao Li, Chunxue Wang, Guangyan Xu, Biwu Chu, Changbin Zhang, Hong He
Summary: This paper summarizes the research advances in the field of NH3-SCO by Ag-based catalysts, which have aroused extensive interests in the past decades. The influence of the catalyst composition and physicochemical properties of Ag-based catalysts on NH3-SCO performance is highlighted, and an overview of the catalytic reaction mechanism and the structure-activity relationship of catalysts is given. Directions and design strategies for high-performance Ag based catalysts in NH3-SCO are also provided.
Article
Chemistry, Physical
Tiur Elysabeth, Kamarza Mulia, Muhammad Ibadurrohman, Eniya L. Dewi, Slamet
Summary: CuO nanoparticles were deposited into titania nanotube arrays via two methods, with CuO-TiNTAs SILAR showing lower bandgap and better photoelectrochemical activity than other samples, efficiently removing ammonia and producing hydrogen under illumination. Therefore, CuO-TiNTAs SILAR is concluded as a better photoanode in the given experimental conditions for photoelectrochemical processes.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Jiaxin Li, Yajun Chang, Dongze Li, Ligang Feng, Baogang Zhang
Summary: The efficient synergism between high valence state V and Pd nanoparticles enhances their catalytic performance and anti-poisoning ability for alkaline methanol electrooxidation.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)