Article
Energy & Fuels
Xiaodi Li, Shan Ren, Lian Liu, Xiangdong Xing, Lin Chen, Jiangling Li, Jian Yang, Qingcai Liu
Summary: The deactivation of denitration catalysts by heavy metals is still a challenge in the practical application of selective catalytic reduction of NOx with NH3. In this study, a novel anti-poisoning strategy was proposed by designing a CeO2/ZrO2 catalyst supported by SO42-/ZrO2 superacid. The introduction of SO42-/ZrO2 significantly enhanced the catalytic performance, leading to high NOx removal efficiency throughout a wide temperature range.
Article
Engineering, Chemical
Bohan Feng, Yuechang Wei, Jing Xiong, Dong Li, Qian Lian, Yuanfeng Li, Dawei Han, Zhen Zhao, Jian Liu, Weiyu Song, Chunming Xu
Summary: Nanocatalysts of VOx supported on ZrO2 with different phases (ZrO2-M, ZrO2-T, and ZrO2-MT) were synthesized. Among them, the VOx/ZrO2-MT catalyst showed the best performance in propane nonoxidative dehydrogenation. The improvement in activity and stability of VOx/ZrO2-MT catalyst was attributed to the mixed phase structure, which enhanced the dispersion of VOx and provided additional active sites. The surface phase transformation of ZrO2-MT facilitated the reduction of VOx and promoted C-H bond breaking.
Article
Thermodynamics
Tatjana Jantzen, Elena Yazhenskikh, Klaus Hack, Moritz To Baben, Guixuan Wu, Michael Muller
Summary: Vanadium oxides were added to the existing GTOx database and thermodynamically assessed in multi-component systems including vanadium. The study combined experimental data with the SGTE alloy database to analyze the complex behavior of vanadium in both slags and liquid metal alloys.
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2021)
Article
Chemistry, Physical
Yusuke Inomata, Hiroe Kubota, Yoshinori Honmatsu, Hiroaki Takamitsu, Sosuke Sakotami, Kazuhiro Yoshida, Takashi Toyao, Ken-ichi Shimizu, Toru Murayama
Summary: NH3-SCR is a key technique for reducing harmful NOx emissions. The study shows that Na-intercalated vanadium oxide can accelerate the reaction and improve the efficiency of NH3-SCR.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Review
Chemistry, Physical
Na Li, Chenhao Ren, Limin Hou, Kunlin Jiao, Wenfei Wu
Summary: In this study, NH3-SCR catalysts were prepared by loading transition metal Mn on SO42--CeCO3F-CePO4 and adding sulphuric acid to improve denitrification performance. The characterization using XRD, Raman, NH3-TPD, H2-TPR, XPS and In situ DRIFTS showed improved denitrification performance of the catalyst after Mn loading and sulphuric acid treatment. In situ IR results indicated the involvement of both Eley-Rideal and Langmuir-Hinshelwood mechanisms in the denitrification reaction.
MOLECULAR CATALYSIS
(2022)
Article
Engineering, Environmental
Shuang Chen, YeJia Lv, Jiaxing Hong, Luman Hou, Jia Zhang, Xiaoqiao Zhang, Xiangyu Zhao, Lixin Wang, Guangren Qian
Summary: Developing a more effective catalyst for environmental pollutants is a global research pursuit. Previous studies focused on prepared catalysts, but more efforts should explore the process from precursor to formed catalyst. In this work, V supported TiO2 catalysts with different V loadings were synthesized and compared for selective catalytic reduction of nitrogen oxide. Differential scanning calorimetry was used for the first time to analyze the forming enthalpy of these catalysts. The results showed that single-atom V had a higher formation enthalpy, lower dehydrogenation energy, and larger turnover frequency (TOF) than cluster V. These findings help optimize the preparation process for an effective catalyst, benefiting hazardous pollutant treatment.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Chemistry, Physical
Su Yang, Xiaoxuan Guo, Xiaomei Pan, Liuyu Gu, Xueping Liu, Lijing Gao, Guomin Xiao
Summary: This study introduces a method for preparing bromopropane from n-propanol using a reactive distillation strategy and Al2O3/SO42-/ZrO2 as a catalyst. The yield of bromopropane can reach 96.18% under optimal conditions without side reactions.
Article
Biochemistry & Molecular Biology
Mikolaj Dembek, Szymon Bocian, Boguslaw Buszewski
Summary: Zeta potential is a surface characteristic formed on the solid surface and liquid interface, which can be used to describe the surface properties of materials. In this study, four homemade stationary phases containing phosphate groups were investigated based on their surface zeta potential. The majority of cases showed negative zeta potential values, but positive zeta potential was observed in some solvents. It was also found that the type of silica gel used for the stationary phase synthesis did not affect the zeta potential.
Article
Chemistry, Physical
Xu-Fang Wang, Lin-Ya Xu, Cai-Hao Wen, Dan -Dan Li, Bei Li, Ji-Qing Lu, Qi-Hua Yang, Meng- Fei Luo, Jian Chen
Summary: In this study, it was discovered that enhancing strong metal-support interaction effectively weakens the competitive adsorption of H2O on Pt active sites in Pt-based catalysts. The formation of aggregated WO3 species in Pt-3W/SO42--ZrO2 leads to enhanced SMSI, which plays a critical role in weakening water vapor adsorption on active sites. As a result, Pt-3W/SO42--ZrO2 exhibits the highest activity (T90 = 200 degrees C) and water tolerance among Pt/ZrO2, Pt/WO3, Pt-3W/ZrO2, and Pt/SO42--ZrO2 under wet conditions (5% H2O). Our preliminary findings provide a promising strategy for designing superior platinum catalysts for VOCs complete oxidation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Xiangxue Liu, Ke Wang, Baoquan Liu, Zhenmei Guo, Chao Zhang, Zhiguo Lv
Summary: The solid super acid catalyst prepared via double bridge connection strategy showed excellent catalytic performance in the oxidation of cyclohexene to adipic acid, attributed to the synergistic effect between WO3 and SO42--ZrO2-TiO2. DFT calculation was employed to further analyze the reaction process and system energy.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Chemistry, Physical
Yankun Zhang, Kexin Zhang, Chunxiao Yang, Meng Yang, Guojian Peng, Yu Xie, Junjie Wen, Futing Xia, Lijuan Jia, Qiulin Zhang
Summary: Ceria catalysts have attracted interest in the NH3-SCR reaction, and the modification of SO42- into CeO2 can enhance the NH3 adsorption and stability, leading to easier occurrence of the reaction.
THEORETICAL CHEMISTRY ACCOUNTS
(2022)
Article
Biotechnology & Applied Microbiology
Duo Xu, Zhitao Han, Yeshan Li, Shijian Lu, Xinxiang Pan
Summary: This comparative study investigated the correlation between support modification and the W and K tolerance performance of Fe/ZrO2 and Fe/ZrO2-W catalysts. The results showed that the Fe/ZrO2-W catalyst exhibited superior anti-K performance compared to the Fe/ZrO2 catalyst. W modification increased the redox capacity and Bronsted acid sites on the catalyst surface, significantly promoting NH3 adsorption and activation, allowing SCR reactions to proceed via both E-R and L-H pathways.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Engineering, Chemical
Safa I. Abasov, Suraya B. Agaeva, Yegana S. Isaeva, Arzu A. Imanova
Summary: A systematic study was conducted on the hydrogenation of toluene using composite catalysts. It was found that 0.4%Co/HZSM-5/SO42-(2.0%)-ZrO2 and 0.4% Ni/HZSM-5/SO42- (2.0%)-ZrO2 catalysts showed high hydrogenating ability for toluene at low hydrogen pressures. Replacing Ni with Co resulted in a decrease in total conversion of toluene and an increase in the yield of cyclohexane, with an inverse relationship between the yields of methylcyclohexane and cyclohexane.
PROCESSES OF PETROCHEMISTRY AND OIL REFINING
(2023)
Article
Chemistry, Physical
Zhiwen Gu, Lijun Cheng, Chong Tan, Songil Sin, Chunkai Huang, Changjin Tang
Summary: In this study, an effective strategy to enhance the immobilization of SO42- on alpha-Fe2O3 catalyst in NH3-SCR was reported by spatial confinement in a mesoporous SBA-15 framework. The results demonstrated a clear correlation between the enrichment of SO42- and the SCR activity, indicating the potential of this strategy in boosting the catalytic performance of iron oxide in NH3-SCR.
Article
Chemistry, Physical
Jinhui Zhang, Jiayao Liu, Xinfeng Zhu, Kai Wang, Zhenzhen Huang, Haiyan Kang, Shiqiang Yin, Shoushu Liu, Luwei Liu, Siyuan Zhang, Zhongxian Song
Summary: A series of SO42--CeO2 catalysts were synthesized by sol-gel method for selective catalytic reduction of NO by NH3 (NH3-SCR). The introduction of SO42- increased the catalytic activity of the composite catalyst compared to pure CeO2. Specifically, 3% SC with 3% SO42- showed over 90% NO removal between 247 and 450 degrees C. SO42- promoted the increase of Ce3+ content, adsorbed oxygen, and surface acidity of the composites. Furthermore, the interaction between SO42- and cerium oxide induced a synergistic effect between acidic sites and redox sites in the NH3-SCR reaction.
CHEMICAL PHYSICS IMPACT
(2023)
Article
Chemistry, Physical
Raquel Portela, Fernando Rubio-Marcos, Pilar Leret, Jose F. Fernandez, Miguel A. Banares, Pedro Avila
JOURNAL OF MATERIALS CHEMISTRY A
(2015)
Article
Chemistry, Physical
M. Villarroel, E. Camu, N. Escalona, P. Avila, S. B. Rasmussen, P. Baeza, F. Gil-Llambias
APPLIED CATALYSIS A-GENERAL
(2011)
Article
Chemistry, Physical
E. Inkeri Kauppi, E. Hanne Ronkkonen, Sanna M. K. Airaksinen, Soren B. Rasmussen, Miguel A. Banares, A. Outi I. Krause
APPLIED CATALYSIS B-ENVIRONMENTAL
(2012)
Article
Chemistry, Physical
D. Gamarra, A. Lopez Camara, M. Monte, S. B. Rasmussen, L. E. Chinchilla, A. B. Hungria, G. Munuera, N. Gyorffy, Z. Schay, V. Cortes Corberan, J. C. Conesa, A. Martinez-Arias
APPLIED CATALYSIS B-ENVIRONMENTAL
(2013)
Article
Chemistry, Applied
Soren B. Rasmussen, Ewelina Mikolajska, Marco Daturi, Miguel A. Banares
Article
Engineering, Environmental
R. Portela, R. F. Tessinari, S. Suarez, S. B. Rasmussen, M. D. Hernandez-Alonso, M. C. Canela, P. Avila, B. Sanchez
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2012)
Article
Chemistry, Physical
Steffen B. Kristensen, Andreas J. Kunov-Kruse, Anders Riisager, Soren B. Rasmussen, Rasmus Fehrmann
JOURNAL OF CATALYSIS
(2011)
Article
Chemistry, Physical
Ewelina Mikolajska, Soren B. Rasmussen, Anna E. Lewandowska, Miguel A. Banares
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2012)
Article
Chemistry, Physical
Soren B. Rasmussen, Miguel A. Banares, Philippe Bazin, Johannes Due-Hansen, Pedro Avila, Marco Daturi
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2012)
Article
Chemistry, Physical
Soren B. Rasmussen, Susana Perez-Ferreras, Miguel A. Banares, Philippe Bazin, Marco Daturi
Article
Chemistry, Multidisciplinary
A. Mendez, M. Villarroel, E. Camu, F. J. Gil-Llambias, P. Avila, P. Baeza
JOURNAL OF THE CHILEAN CHEMICAL SOCIETY
(2013)
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.
