Article
Engineering, Environmental
Lu Wei, Zhiwei Wang, Yuxi Liu, Guangsheng Guo, Hongxing Dai, Suping Cui, Jiguang Deng
Summary: According to the study, Mn-based catalysts with SO2&K co-poisoning exhibit higher SCR activity than catalysts poisoned by SO2 or K individually. The majority of K adsorbed on the support leads to increased alkalinity, promoting the adsorption of SO2 and reducing the toxicity of the active component.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Physical
Ferenc Martinovic, Fabio Alessandro Deorsola, Marco Armandi, Barbara Bonelli, Regina Palkovits, Samir Bensaid, Raffaele Pirone
Summary: A composite catalyst formed by mixing Cu-SSZ-13 with CeO2-SnO2 through solid-state synthesis showed resistance to hydrocarbon poisoning in NH3-mediated NOx-SCR reaction. The addition of CeO2-SnO2 enhanced the resistance towards propylene poisoning, with the primary active sites playing a complex role in preventing hydrocarbon poisoning. The mechanism proposed for deactivation and poisoning prevention involved HONO/nitrate intermediates formed over CeO2-SnO2 re-activating the zeolitic copper for SCR reaction, highlighting the importance of the interaction between different active sites.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Jun Cao, Zhuquan Lu, Liumei Teng, Xu Qiao, Weizao Liu, Hongli Wu, Lijun Jiang, Qirong Wu, Qingcai Liu
Summary: This study investigated the poisoning effects of K2O and PbO on the NH3-SCR performance of TiO2-CeO2 catalyst, and found a stronger toxicity when both were introduced simultaneously, hindering electron transfer and surface acidity. Furthermore, the combination of K and Pb reduced the activation performance of NOx species and did not alter the Langmuir-Hinshelwood mechanism of the catalyst.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Liqiang Qi, Silan Li, Wen Wang, Jingxin Li
Summary: The Mg-modified V2O5-MoO3/TiO2 catalyst showed higher NOx SCR activity and resistance to P, SO2, and H2O compared to the V(2)O(5)-MoO3/TiO2 catalyst. Mg modification promoted the denitration activity of the catalyst, with Mg-1-SCR achieving a maximum NOx removal efficiency of 97.5%. Mg doping expanded the temperature range for denitration and improved the durable resistance to P, SO2, and H2O, with Mg-0.5-SCR and Mg-1-SCR displaying higher resistance compared to the original catalyst.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Dongdong Ren, Keting Gui, Shaochen Gu
Summary: The study reveals that Ce doping can effectively decrease the activation energy of the decomposition of ammonium sulfate and promote its decomposition on the catalyst surface, while Mn doping hardly improves the decomposition of ammonium sulfate on the catalyst surface. Therefore, doping Ce on the gamma-Fe2O3 catalyst can effectively improve the sulfur resistance of the catalyst, while Mn has little effect.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yang Gao, Li Cao, Xiaodong Wu, Xu Zhang, Ziran Ma, Rui Ran, Zhichun Si, Duan Weng, Baodong Wang
Summary: CeNbTi catalyst was poisoned by sulfur in different atmospheres, and the addition of NH3 effectively inhibited catalyst deactivation. The roles of NH3 in removing surface sulfates were studied using TPD analysis and DRIFTS experiments, and it was found that ammonium sulfates were generated under certain conditions.
Article
Chemistry, Physical
Wanxia Zhao, Jing Rong, Wen Luo, Lulu Long, Xiaojiang Yao
Summary: The CS-HT catalyst showed better denitration activity and anti-K poisoning performance compared to the CS-CP catalyst, which was attributed to the good distribution of Sn4+, excellent redox performance, and surface acidity in the former. The enhancement of the anti-K poisoning ability of the CS-HT catalyst was related to the easier combination of Sn-O bonds with introduced K, which protected the Ce-O active sites.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Environmental
Gongda Chen, Shangchao Xiong, Xiaoping Chen, Xuefeng Chu, Rongqiang Yin, Changdong Liu, Jianjun Chen, Junhua Li
Summary: This study analyzed deactivated honeycomb V2O5-WO3/TiO2 catalysts used for over 4000 hours in glass furnaces, revealing that the adhered substance was mainly composed of Na2SO4 and CaSO4, with arsenic penetrating to a depth of over 370 μm and inducing a three-stage penetration and deactivation process. It was found that molten and volatile As2O3 played a key role in the deactivation caused by arsenic.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Erhao Gao, Wenjing Feng, Bei Huang, Jiali Zhu, Wei Wang, Jiwei Li, Yi He
Summary: The study investigated the sulfuric acid pretreatment on the MnCoCrOx (MCC) catalyst, which effectively improved the tolerance to Na+ poisoning, maintained the activity and selectivity of the catalyst, and provided new insights for enhancing the tolerance of metal oxides SCR catalyst to alkali metals.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Physical
Yang Zheng, Yangyang Guo, Jian Wang, Lei Luo, Tingyu Zhu
Summary: The poisoning effect of Ca limits the further application of vanadium-based catalysts in high-calcium content flue gas. CaO doping deteriorates the surface acid sites and oxidation/reduction properties of V2O5-WO3/TiO2 (VWT) and V2O5/TiO2 (VT) catalysts, leading to a decrease in NO conversion during NH3-SCR, with NH3 oxidation becoming more competitive at higher temperatures.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Houda Jouini, Imene Mejri, Joaquin Martinez-Ortigosa, Jose L. Cerillo, Carolina Petitto, Mourad Mhamdi, Teresa Blasco, Gerard Delahay
Summary: This study investigates the performance change of Fe-Cu-ZSM-5 SCR catalyst after contacting with poisoning species such as sodium and potassium. It is found that the introduction of alkali metals does not deteriorate the crystallinity and morphology of zeolite crystals, but leads to a significant loss of surface acidity, resulting in a dramatic deactivation of the SCR reaction.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Chemistry, Physical
De-yu Guo, Rui-tang Guo, Chao-peng Duan, Yuan-zhen Liu, Gui-lin Wu, Yang Qin, Wei-guo Pan
Summary: The modification of Cu-SSZ-13 catalysts with Ce enhances resistance to K deactivation and improves SCR performance, mainly due to the synergistic effect between Ce and Cu.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Inorganic & Nuclear
Hongli Wu, Weizao Liu, Ya Liang, Qingcai Liu
Summary: The incorporation of inert silica into pure MnOx effectively improved the resistance of Mn-based catalysts to lead toxicity and enhanced their activity in the selective catalytic reduction of NOx with ammonia (NH3-SCR). The presence of PbCl2 occupied the active Mn sites and resulted in a decline in the surface acidity and oxidation performance of the catalysts. However, silica played a crucial role in preserving the activity of Mn sites by preferentially bonding with PbCl2, generating more active intermediates. This work provides mechanistic insights into the role of SiO2 in regulating the surface acidity and stability of Mn-based catalysts, which is useful for designing catalysts with high Pb resistance for the NH3-SCR reaction.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Zhaoying Di, Hao Wang, Runduo Zhang, Hongxia Chen, Ying Wei, Jingbo Jia
Summary: By constructing a core-shell ZSM-5@CeO2 support and loading copper, the NH3-SCR performance, as well as the tolerance to H2O and SO2, was improved. The Cu/(ZSM-5@CeO2) catalyst showed superior activity with the lowest T-90 at 215°C, attributed to the interaction between CeO2 shell and copper ions, which enhanced the redox properties. The ZSM-5 core provided more acid sites for improved ammonia adsorption. The CeO2 shell preferentially reacted with SO2, leading to high sulfur tolerance. This study provides a strategy for designing and applying NH3-SCR zeolite catalysts.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Engineering, Chemical
Zhichao Chen, Mingming Wang, Shan Ren, Xiaodi Li, Lin Chen, Jiangling Li, Jian Yang, Qingcai Liu
Summary: In this study, an Al2O3-modified Mn-Ce/AC catalyst was synthesized using the impregnation method. The addition of Al significantly improved the catalytic activity of the MC/AC catalyst. XRD analysis confirmed that Al oxide inhibited the crystallization of active MnO2 on the poisoned catalysts, leading to better component dispersion. Al doping increased the aggregation of PbCl2, releasing more active sites and mitigating the negative effect of PbCl2. The presence of more Mn4+ and surface oxygen with Al addition promoted the redox cycle and activation of reactants. The enhanced surface acidity and redox property played important roles in the catalyst's ability to resist PbCl2. In situ DRIFTS analysis revealed that both E-R and L-H pathways were followed by all catalysts, with E-R being the dominant pathway. PbCl2 did not change the reaction pathways but hindered the occurrence of the reaction. A possible mechanism model of Al2O3's resistance to PbCl2 over the MC/AC catalyst was proposed.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Review
Engineering, Chemical
Federica Gramigni, Umberto Iacobone, Nicole D. Nasello, Tommaso Selleri, Nicola Usberti, Isabella Nova
Summary: Low-temperature operation of NH3-SCR systems poses challenges related to poor catalyst activity and urea injection handling, with unburned hydrocarbons potentially damaging DeNOx catalysts irreversibly. This paper summarizes the effects of HCs on NH3-SCR performance and presents available kinetic models, discussing competitive adsorption, zeolite structure effects, potential surface intermediates, pore blocking, parasitic reactions, and design of improved catalysts with enhanced resistance to hydrocarbon poisoning.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Editorial Material
Engineering, Chemical
Alessandra Beretta, Gianpiero Groppi, Luca Lietti, Matteo Maestri, Isabella Nova
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Federica Gramigni, Nicole Daniela Nasello, Nicola Usberti, Umberto Iacobone, Tommaso Selleri, Wenshuo Hu, Shaojun Liu, Xiang Gao, Isabella Nova, Enrico Tronconi
Summary: NO and NH3 can readily reduce CuII at low temperatures according to a 1:1:1:1 stoichiometry over Cu-CHA catalysts. The reduction rates of Cu-II show a quadratic dependence on Cu-II, suggesting a dinuclear-Cu-II mediated RHC pathway. Water significantly inhibits the Cu-II reduction rate in the reaction cascade.
Article
Energy & Fuels
Shehab Salem, Karel Frana, Iva Nova
Summary: This paper investigates the potential of cylindrical piezoelectric transducers for harvesting high-frequency acoustic energy. Through open-circuit and closed-circuit measurements, the study explores the relationship between sound wavelength, cylinder size, and load on energy harvesting performance, achieving successful energy collection and storage with optimized load conditions.
Article
Metallurgy & Metallurgical Engineering
I Nova, K. Frana, T. Lipinki
Summary: The behavior and monitoring of sodium chloride in interaction with aluminum alloy melt is crucial for producing expanded aluminum materials, requiring the use of a vacuum system and inert gas. Control of pressing pressure on the aluminum alloy melt and studying the properties can significantly impact the quality and application of the materials produced.
PHYSICS OF METALS AND METALLOGRAPHY
(2021)
Article
Chemistry, Physical
Wenshuo Hu, Umberto Iacobone, Federica Gramigni, Yu Zhang, Xiaoxiang Wang, Shaojun Liu, Chenghang Zheng, Isabella Nova, Xiang Gao, Enrico Tronconi
Summary: The study finds that NH3-assisted hydrolysis plays a critical role in low-temperature SCR, especially when discussing Z(2)Cu(2+).
Article
Chemistry, Physical
Iva Nova, Karel Frana, Pavel Solfronk, Jiri Sobotka, David Korecek, Martin Svec
Summary: This paper discusses research related to the production of metal cellular aluminium systems using sodium chloride particles. A new methodology involving pressing salt particles into the melt of aluminium alloy was developed and verified for producing porous aluminium materials. Samples of porous aluminium materials were produced and analysed, with characteristics such as weight, volume, density, porosity, and air cell continuity monitored and evaluated.
Article
Chemistry, Physical
Wenshuo Hu, Federica Gramigni, Nicole Daniela Nasello, Nicola Usberti, Umberto Iacobone, Shaojun Liu, Isabella Nova, Xiang Gao, Enrico Tronconi
Summary: Cu-exchanged chabazite zeolite (Cu-CHA) is an efficient catalyst for the selective catalytic reduction (SCR) of NOx, and the dynamic cycling of Cu cations plays an important role in the SCR process. Cu cations are activated by forming Cu-NH3 complexes through reaction with NH3 under low-temperature conditions, and they exhibit homogeneous features in the heterogeneous catalytic process of low-temperature SCR. These features are influenced by electrostatic interactions between Cu cations and conjugate Al centers.
Article
Chemistry, Physical
Maria Elena Azzoni, Federico Sascha Franchi, Nicola Usberti, Nicole Daniela Nasello, Lidia Castoldi, Isabella Nova, Enrico Tronconi
Summary: A new dual-layer monolithic AdSCR system was prepared and studied as a potential solution to improve the low-temperature performances of NH3-SCR catalysts. By optimizing the washcoat formulations and using the appropriate solvent, the migration between layers was prevented, maintaining the catalytic activity and showing promising performance in NOx abatement.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Nicola Usberti, Sara Ciria, Stefano Golini, Gabriella Mancino, Edoardo Merlone Borla, Isabella Nova, Enrico Tronconi
Summary: The addition of a passive SCR catalytic device downstream of the three-way catalytic converter in NGVs can effectively reduce NH3 emission under rich-lean cycling conditions. NH3 is adsorbed onto the SCR catalyst during the rich phase and consumed by NO+O-2 during the lean phase. At high temperatures, NH3 can be efficiently converted to nitrogen through direct oxidation. The developed model can predict the performance of fresh and aged catalysts under transient rich-lean cycling conditions.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
Umberto Iacobone, Isabella Nova, Enrico Tronconi, Roberta Villamaina, Maria Pia Ruggeri, Jillian Collier, David Thompsett
Summary: Cu2+ ions are regarded as the precursors of active site in Cu-exchanged chabazite for NH3-SCR. CO oxidation to CO2 can probe the formation of low-T RHC step. NH3 enhances CO2 production by solvating Cu2+ ions.
Article
Engineering, Manufacturing
Iva Nova, Karel Frana, Pavel Solfronk, David Korecek, Jiri Sobotka
Summary: This paper discusses the production and monitoring of metallic cellular structures and aluminium foams, with a focus on the mechanical properties of two types of foamed AlSi12 aluminium alloy samples. The samples were produced using powder metallurgy and a foaming agent TiH2, and the porosity and continuity of air cells were monitored using a scanning electron microscope.
MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Chemical
A. Vespertini, A. Della Torre, G. Montenegro, A. Onorati, I. Nova, E. Tronconi
Summary: This study investigates the impact of the cell shape of Periodic Open Cell Structures (POCS) on mass transfer through CFD simulations. An algorithm is developed to increase the wet surface of a simple cubic POCS while maintaining constant mean pore diameter and negligible porosity variations. The catalytic performances of the substrates are evaluated, suggesting the possibility of enhancing the mass transfer properties of POCS through continuous random shape transformation. A dedicated CFD multi-region solver is used to account for heat/mass transfer and catalytic reactions. Additionally, a fluid-dynamic approach is proposed to estimate the value of tortuosity and its effect on the flow field, investigating its dependency on the POCS randomization level.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Applied
Umberto Iacobone, Isabella Nova, Enrico Tronconi, Roberta Villamaina, Maria Pia Ruggeri, Jillian Collier, David Thompsett
Summary: The modifications of ZCu(2+)(OH)(-) and Z(2)Cu(2+) ions during NH3-SCR on Cu-CHA catalysts are crucial for understanding the low-temperature redox SCR mechanism. The generation of dinuclear Cu2+ structures has been confirmed under representative conditions using a dry transient CO oxidation protocol. The presence of NH3 promotes the activity of ZCu(2+)(OH)(-) as the CO oxidation catalyst, while Z(2)Cu(2+) is inactive. An increase in Cu loading enhances CO2 production, indicating a larger population of ZCu(2+)(OH)(-) and a further enhancement is observed with the presence of H2O. The CO oxidation protocol proves to be a versatile technique for studying Cu2+ ions in Cu-CHA catalysts.
TOPICS IN CATALYSIS
(2023)
Article
Chemistry, Physical
Nicole Daniela Nasello, Nicola Usberti, Umberto Iacobone, Federica Gramigni, Wenshuo Hu, Shaojun Liu, Isabella Nova, Xiang Gao, Enrico Tronconi
Summary: The reduction and oxidation half-cycles of low-temperature NH3-selective catalytic reduction (SCR) over a Cu-CHA catalyst were studied. The reduction half-cycle proceeds via second-order kinetics in CuII and with a stoichiometric relationship between CuII reduced and NO consumed. The oxidation half-cycle involves complete reoxidation of NH3-solvated Cu sites by O2 + H2O. The coupling of the kinetic models for reduction and oxidation accurately describes the steady-state SCR reactions and predicts various parameters consistent with experimental measurements.
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.
