Review
Energy & Fuels
Yuanyuan Zhang, Guojin Cao, Xiao Yang
Summary: This paper summarizes the methods for reducing NO emissions in China, discusses the research status and issues of different de-NOx methods, with a focus on the direct catalytic decomposition method and the research progress of six major catalysts used in this method. Detailed research on Cu-ZSM-5 is conducted due to its high activity and O-2 tolerance, and future research directions for NO decomposition are discussed.
Article
Engineering, Environmental
Yuting Yuan, Shikha Garg, Jinxing Ma, T. David Waite
Summary: In this study, copper aluminum layered hydroxides and copper oxide were used as catalysts for heterogeneous catalytic ozonation, targeting the removal of oxalate and formate contaminants. The role of the catalyst in contaminant removal was elucidated, with Cu-Al LDHs facilitating slow decay of O-3 to form surface hydroxyl radicals, while CuO rapidly transforms O-3 into surface-located hydroxyl radicals and/or other oxidants. Futile consumption of surface-located oxidants via interaction with the catalyst surface was minimal for Cu-Al LDHs, but becomes significant with higher CuO dosages.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Nazrizawati A. Tajuddin, Jinesh C. Manayil, Adam F. Lee, Karen Wilson
Summary: This study reports an alkali-free route to prepare NixAl LDH catalysts and investigates the reconstruction effect of LDH under hydrothermal treatment. The reconstructed LDH exhibits higher catalytic activity and stability for transesterification reactions.
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
Tim Van Everbroeck, Jianxiong Wu, Daniel Arenas-Esteban, Radu-George Ciocarlan, Myrjam Mertens, Sara Bals, Christophe Dujardin, Pascal Granger, Elena M. Seftel, Pegie Cool
Summary: This research presents a novel approach for developing noble metal-free three-way catalysts using ZnAl layered double hydroxide (LDH) co-precipitated with Mn and Ti. The addition of Cu during the co-precipitation step and a post-synthesis method using the LDH memory effect were explored. The results showed that smaller CuO particle size resulted in better performance for oxidation reactions. The addition of Mn had a positive effect on the general performance of the catalysts, while the presence of Ti mainly improved the NO conversion. The developed materials showed good stability in consecutive catalytic testing cycles and even showed some NO conversion under stoichiometric conditions.
APPLIED CLAY SCIENCE
(2022)
Article
Chemistry, Physical
Peilong Li, Xiaoyu Hu, Zexuan Zhang, Ming Wen, Min Chen, Bin Yu, Linsen Zhou, Wenwen Yong, Jiangfeng Song, Xin Zhang, Wenhua Luo
Summary: The study demonstrates the fabrication and testing of NiAl-LDHs with different Ni/Al ratios, revealing that Ni2-Al2O3 exhibits excellent activity due to a balanced combination of Ni content, specific surface area, Ni particle size, and Al3+ configuration proportion. This sheds light on the reaction mechanism of VPCE process and has implications for the rational design of highly efficient catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Engineering, Environmental
Zhi-Hui Xie, Hong-Yu Zhou, Chuan-Shu He, Zhi-Cheng Pan, Gang Yao, Bo Lai
Summary: Layered double hydroxides (LDHs) show excellent catalytic performance in advanced oxidation processes, effectively degrading organic pollutants in water. Compared to LDHs, LDOs and nanocomposites exhibit other beneficial properties that are suitable for AOPs catalytic processes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Shengyang Zhang, Bolin Zhang, Boyu Wu, Bo Liu, Shengen Zhang
Summary: The study investigates the effects of Sm on Mn-based catalysts for SCR of NO with NH3. It is found that Sm doping improves the catalytic activity, with the Sm0.15Mn0.15Ti catalyst showing the best performance. The presence of Sm increases surface-absorbed oxygen and weakens the redox property, leading to higher NO conversion and N-2 selectivity. Rating: 8/10.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Chemistry, Physical
Gihoon Cha, Sebastian Weiss, Jannik Thanner, Sabine Rosenfeldt, Volodymyr Dudko, Felix Uhlig, Max Stevenson, Ingmar Pietsch, Renee Siegel, Daniel Friedrich, Wolfgang Bensch, Juergen Senker, Nobuyuki Sakai, Takayoshi Sasaki, Josef Breu
Summary: Traditional delamination of lepidocrocite-type layered titanate results in the loss of structural lithium, while a new one-step delamination method avoids such loss and produces lithium titanate nanosheets with high aspect ratios.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tosapol Maluangnont, Piyasan Praserthdam, Tawan Sooknoi
Summary: The cascade reaction of palmitic acid to hydrocarbons was investigated over different catalysts, and it was found that the layered alkali titanate catalysts exhibited higher activity and selectivity compared to TiO2 and Mg/Al mixed oxide catalysts. The reaction pathway and yield of hydrocarbons were influenced by temperature and the partial charge at the O atom.
Article
Construction & Building Technology
Xiaojuan Kang, Hailong Ye
Summary: The influence of sodium benzoate on antimicrobial alkali-activated slag (AAS) was studied, and it was found that sodium benzoate can in-situ form bilayer benzoate-intercalated layered double hydroxides (BZ-LDHs) in AAS. The addition of sodium benzoate slightly affects the reaction degree of slag in AAS but has almost no effect on the composition and structure of calcium-aluminosilicate-hydrate (C-A-S-H) formed. The developed antimicrobial AAS with BZ-LDHs demonstrates remarkable bactericidal efficacy.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Energy & Fuels
Jiawei Zhong, Bing Han, Zhige Zhang, Guican Bi, Jun Xie
Summary: Ru/Mgx(Al)O nano-catalysts derived from Ru/MgAl layered double hydroxide showed excellent catalytic activity and stability in the bi-reforming of model biogas. The performance was attributed to the CO2 activation and active O* species generation facilitated by the Mgx(Al)O mixed oxides, as well as the inhibited coke deposition by highly-dispersed Ru ultrafine NPs.
Article
Chemistry, Applied
Elisabetta Orfei, Andrea Fasolini, Salvatore Abate, Nikolaos Dimitratos, Francesco Basile
Summary: The present study investigates the possibility of using Layered-Double Hydroxides (LDH) as catalysts for the reduction of 4-nitrophenol (4NP) in wastewaters. The effects of various parameters on the reaction kinetics were studied, including the nature of LDH, LDH thermal treatment, substrate/catalyst ratio, and stirring rate. The results show that LDH enhances the synergistic effect of nickel and copper, leading to increased reducibility and enhanced 4NP reduction.
Article
Engineering, Environmental
Ming-xin Xu, Han-Xiao Wang, Hao-dong Ouyang, Li Zhao, Qiang Lu
Summary: This study found that bismuth species is the optimal promoter, significantly improving the decomposition activity of NiO catalysts for N2O, and increasing steam resistance capability. Doping Bi species also helps to increase the specific surface area and oxygen adsorption/desorption capacity of the catalyst, promoting N2O decomposition performance. However, excess Bi species may decrease the surface area of NiO catalysts and cover active sites.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Chemical
K. O. Denisova, A. A. Il'in, A. P. Il'in, Yu N. Sakharova
Summary: A series of oxide catalysts modified with potassium cations were synthesized using mechanochemical synthesis. Increasing the potassium content led to decreased crystallinity and increased specific surface area of the oxide catalysts. The formation of weakly bound oxygen species resulted in increased catalytic activity in the decomposition of nitrous oxide. However, the presence of oxygen or water in the reaction mixture decreased the catalytic activity at low temperatures.
THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Applied
Kveta Jiratova, Frantisek Kovanda, Jana Balabanova, Petra Ksirova
Article
Nanoscience & Nanotechnology
Jan Hynek, Sebastian Jurik, Martina Koncosova, Jaroslav Zelenka, Ivana Krizova, Tomas Ruml, Kaplan Kirakci, Ivo Jakubec, Frantrsek Kovanda, Kamil Lang, Jan Demel
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2018)
Article
Chemistry, Applied
Michaela Dvorakova, Roman Perekrestov, Petra Ksirova, Jana Balabanova, Kveta Jiratova, Jaroslav Maixner, Pavel Topka, Jiri Rathousky, Martin Kostejn, Martin Cada, Zdenek Hubicka, Frantisek Kovanda
Article
Chemistry, Physical
Kveta Jiratova, Katerina Pacultova, Jana Balabanova, Katerina Karaskova, Anna Klegova, Tereza Bilkova, Vera Jandova, Martin Kostejn, Alexandr Martaus, Andrzej Kotarba, Lucie Obalova
Article
Chemistry, Physical
Katerina Pacultova, Tereza Bilkova, Anna Klegova, Katerina Karaskova, Dagmar Fridrichova, Kveta Jiratova, Tomas Kiska, Jana Balabanova, Martin Kostejn, Andrzej Kotarba, Wojciech Kaspera, Pawel Stelmachowski, Grzegorz Slowik, Lucie Obalova
Article
Chemistry, Physical
Kveta Jiratova, Roman Perekrestov, Michaela Dvorakova, Jana Balabanova, Pavel Topka, Martin Kostejn, Jiri Olejnicek, Martin Cada, Zdenek Hubicka, Frantisek Kovanda
Article
Environmental Sciences
Pavel Topka, Michaela Dvorakova, Petra Ksirova, Roman Perekrestov, Martin Cada, Jana Balabanova, Martin Kostejn, Kvetuse Jiratova, Frantisek Kovanda
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2020)
Article
Materials Science, Ceramics
Bahaa M. Abu-Zied, Lucie Obalova, Katerina Pacultova, Katerina Karaskova, Maged S. Al-Fakeh, Abdullah M. Asiri, Fahad M. Alminderej
CERAMICS INTERNATIONAL
(2020)
Article
Chemistry, Physical
Kveta Jiratova, Katerina Pacultova, Katerina Karaskova, Jana Balabanova, Martin Kostejn, Lucie Obalova
Article
Chemistry, Physical
Katerina Karaskova, Katerina Pacultova, Anna Klegova, Dagmar Fridrichova, Marta Valaskova, Kvetuse Jiratova, Pawel Stelmachowski, Andrzej Kotarba, Lucie Obalova
Article
Chemistry, Physical
Katerina Karaskova, Katerina Pacultova, Kvetuse Jiratova, Dagmar Fridrichova, Martin Kostejn, Lucie Obalova
Article
Environmental Sciences
Pavel Topka, Kvetuse Jiratova, Michaela Dvorakova, Jana Balabanova, Martin Kostejn, Frantisek Kovanda
Summary: This study aimed to develop a novel method for preparing structured Co-Mn mixed oxide catalysts by depositing the active phase on stainless steel meshes through hydrothermal synthesis. The catalysts exhibited significantly higher catalytic activity in ethanol oxidation compared to commercial pelleted Co-Mn-Al catalysts, with the activity correlating with the proportion of surface oxygen vacancies determined by XPS. The exceptional activity of the catalyst with a Co:Mn ratio of 0.5 was attributed to the high number of oxygen vacancies and exceptional redox properties.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Kveta Jiratova, Roman Perekrestov, Michaela Dvorakova, Jana Balabanova, Martin Kostejn, Martin Vesely, Martin Cada, Pavel Topka, Dana Pokorna, Zdenek Hubicka, Frantisek Kovanda
Summary: Magnetron sputtering is an advantageous method for preparing catalysts supported on stainless steel meshes, particularly for processes carried out at high space velocities. The CoOx-MnOx and CoOx-CoMnOx catalysts showed high catalytic activity on stainless steel meshes, with the thinnest layer displaying the highest catalytic activity. Compared to the commercial pelletized Co-Mn-Al mixed oxide catalyst, the sputtered catalysts demonstrated significantly higher catalytic activity despite lower content of the Co and Mn active components.
Article
Chemistry, Physical
Szabolcs Murath, Natalie Dvornikova, Daniel Moreno-Rodriguez, Radek Novotny, Miroslav Pospisil, Martina Urbanova, Jiri Brus, Frantisek Kovanda
Summary: Anionic drugs atorvastatin and valsartan were successfully intercalated into Mg-Al LDH host with high drug loading. XRD analysis confirmed the intercalation of both drugs, while molecular modeling showed the interaction between drugs and LDH at the atomic scale. Experimental measurements supported the findings from the modeling, indicating weak electrostatic interactions between LDH layers and drug molecules. The release of the drugs from the intercalated LDH slightly differed in different media, following pseudo-second-order kinetics.
APPLIED CLAY SCIENCE
(2023)
Article
Chemistry, Physical
K. Jiratova, J. Balabanova, F. Kovanda, A. Klegova, L. Obalova, R. Fajgar
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.
