Article
Chemistry, Physical
Tshepo Molefe, Roy P. Forbes, Neil J. Coville
Summary: The article discusses the use of osmium as a catalyst or promoter for Fischer Tropsch synthesis, with osmium nanoparticles supported on SiO2 or encapsulated inside hollow carbon spheres studied. The research shows that osmium primarily produces C(1) and C(2) hydrocarbons, but deactivates in the reaction, with osmium readily sintering on the supports under syngas, providing a deactivation pathway for the catalyst under FT conditions.
Article
Energy & Fuels
Chuan Qin, Jingyang Bai, Yanfei Xu, Yixiong Du, Jungang Wang, Mingyue Ding
Summary: This study successfully synthesized a hollow Co@SiO2 catalyst with high activity and selectivity, which also exhibited excellent stability. The hollow core-shell structure provided an advantageous environment for the exposure of active cobalt sites and catalytic reactions, while preventing the aggregation of active particles.
Article
Chemistry, Multidisciplinary
Meng Cui, Qingli Qian, Jingjing Zhang, Ying Wang, Bernard Baffour Asare Bediako, Huizhen Liu, Buxing Han
Summary: The study presents the production of liquid fuel from CO2 hydrogenation by coupling homogeneous RuCl3 and heterogeneous Ru-0 catalysts at the lowest reported temperature (180 degrees C) and achieving the highest C5+ selectivity to date (71.1%). The synergy of homogeneous and heterogeneous catalysis is identified as the key factor for the outstanding performance.
Article
Chemistry, Physical
Yanfei Xu, Guangyuan Ma, Jingyang Bai, Yixiong Du, Chuan Qin, Mingyue Ding
Summary: A catalyst with FeMn nanoparticles as the yolk and hollow HZSM-5 zeolite as the shell was designed to achieve high space time yield (STY) for aromatics, outperforming previously reported catalytic systems significantly. The enhanced catalytic performance was attributed to the spatially and temporally ordered effect of the yolk@shell structure, which fully exploited the shape-selective effect and aromatization ability of HZSM-5 zeolite. The findings provided a strategy for constructing highly efficient multifunctional catalysts, which could be potentially applied to other tandem catalysis systems.
Article
Energy & Fuels
Dalia Liuzzi, Francisco J. Perez-Alonso, Sergio Rojas
Summary: Ru-Co/Al2O3 and Ru-Fe/Al2O3 catalysts prepared by reduction-deposition method exhibit high activity in Fischer-Tropsch Synthesis, showing different conversion rates and product selectivity. The interaction between Ru and Co in Ru-Co/Al2O3 enhances the activity, while Ru-Fe/Al2O3 displays superior initial performance but declines over time, with less enriched products compared to Ru/Al2O3.
Article
Chemistry, Physical
Tshepo Molefe, Dean Barrett, Beatriz Diaz, Roy Forbes, Neil J. Coville
Summary: This study reports on the synthesis and application of osmium nanoparticles supported on and/or encapsulated in hollow carbon spheres for Fischer-Tropsch Synthesis (FTS). It is demonstrated that the interaction between osmium and cobalt has a significant effect on the catalyst activity when loaded together. Proximity of osmium and cobalt leads to higher FTS activity and C5+ production through the primary spillover effect. This study reveals the effect of osmium on FTS catalysts for the first time.
JOURNAL OF CATALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Kristina Mazurova, Aleksandr Glotov, Mikhail Kotelev, Oleg Eliseev, Pavel Gushchin, Maria Rubtsova, Anna Vutolkina, Ruslan Kazantsev, Vladimir Vinokurov, Anna Stavitskaya
Summary: A nanoarchitectural approach was used to load mesoporous halloysite nanotubes with RuCo nanoparticles for Fischer-Tropsch catalysis. The resulting catalyst exhibited high activity, low selectivity to methane and CO2, high selectivity to C5+ hydrocarbons, and a chain growth index of 0.853. The choice of reducing agent during synthesis played a crucial role in the reducibility and selectivity of the RuCo catalysts.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Yanping Chen, Jiatong Wei, Melis S. Duyar, Vitaly V. Ordomsky, Andrei Y. Khodakov, Jian Liu
Summary: This review summarizes the recent advances in the preparation of carbon-based catalysts for Fischer-Tropsch synthesis, highlighting the importance of support and metal properties, activity, product selectivity, and their interactions. Current challenges and future trends in the commercial utilization of carbon-based catalysts for FTS are also discussed.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Physical
Tingyu Lei, Xingchen Liu, Amar Deep Pathak, Sharan Shetty, Qingya Liu, Xiaodong Wen
Summary: This study examined the mechanism of carbon deposition and hydrogenation on Fe clusters using the DFTB-NMD method, revealing the formation of carbon chains, rings, and fused rings during deposition. Hydrogenation of activated carbon occurs via direct C-H coupling, while hydrogenation of graphitic carbon involves various reactions. The Fe catalyst primarily provides active sites for hydrogen dissociation and spillover, with limited activity in C-C bond breaking.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Energy & Fuels
Wenli Lu, Jungang Wang, Zhongyi Ma, Congbiao Chen, Yan Liu, Bo Hou, Debao Li, Baojun Wang
Summary: The role of carbon deposits during Fischer-Tropsch synthesis (FTS) on cobalt catalysts is still debated. This study investigates the effects of pre-deposited composite and single carbon on cobalt catalysts in FTS. Different types of carbon deposits (atomic carbon, polymeric carbon, graphitic carbon) are identified and characterized using TPH, Raman, and XPS. Results show that the presence of pre-deposited carbon significantly affects the catalytic activity, methane selectivity, and stability of the Co-based catalysts in FTS.
Article
Chemistry, Physical
M. J. Valero-Romero, F. J. Garcia-Mateos, Freek Kapteijn, J. Rodriguez-Mirasol, T. Cordero
Summary: Cobalt-containing lignin-based fibers were synthesized for low-temperature Fischer-Tropsch synthesis. The fibers heat-treated at 500℃ showed the best catalytic performance with selectivity of 75% and 60%.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Mohammadreza Rezaei Kafrani, Ali Aghababai Beni, Zahra Pournuroz Nodeh
Summary: In this study, cobalt-ruthenium nanocatalysts supported on nitrogen-doped graphene aerogel (NGA) and carbon nanotubes (CNT) were synthesized and compared for Fischer-Tropsch process. The use of NGA as catalyst support led to higher conversion of carbon monoxide and methane selectivity, while the use of CNTs led to higher selectivity towards C5+ production.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Physical
Xiaoxue Han, Jing Lv, Shouying Huang, Qiao Zhao, Yue Wang, Zhenhua Li, Xinbin Ma
Summary: The conversion of syngas to liquid fuels and chemicals using Fischer-Tropsch synthesis is a promising alternative route. In this study, carbon-encapsulated nanoparticles were synthesized to control particle size and improve catalytic activity. The catalytic performance of these nanoparticles (Fe@C) was found to be superior to conventional carbon-supported nanoparticles (Fe/C). By tuning the particle size, a peak in iron time yield was obtained, suggesting that particle size plays a significant role in catalytic performance. This study provides insights into the size effect on Fe-based catalytic Fischer-Tropsch synthesis.
Article
Chemistry, Physical
Weiteng Zhan, Yajing Wang, Jianmin Chen, Zhijie Chen, Yingwei Li
Summary: A new type of N-doped carbon nanotube assembled hollow polyhedron catalyst with embedded hollow Co nanoparticles is reported for highly efficient Fischer-Tropsch synthesis (FTS). The catalyst exhibits excellent C5+ selectivity, and theoretical calculations reveal strong coupling between Co active sites and adsorbed CO/intermediates.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Zhe Cai, Shuai Lyu, Yao Chen, Chengchao Liu, Yuhua Zhang, Faquan Yu, Jinlin Li
Summary: In this study, a series of catalysts with Co nanoparticles embedded in a matrix of porous carbon were directly synthesized using a unique melting approach. The catalyst showed high selectivity towards heavy hydrocarbons and low selectivity towards methane at a high operating temperature of 260 degrees C, with no obvious deactivation observed. The special carbon rich environment of the catalyst could inhibit the oxidization and agglomeration of the active phase, preventing deactivation.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Pumza Mente, Victor Mashindi, Alice Magubane, Tumelo N. Phaahlamohlaka, Prakash M. Gangatharan, Roy P. Forbes, Neil J. Coville
Summary: A vapour phase flow system was used to study the hydrogenation of cinnamaldehyde using cobalt catalysts supported inside and outside hollow carbon spheres (HCSs). The results showed that the Co@HCS catalyst exhibited better conversion and product selectivity compared to the Co/HCS catalyst. Catalyst particle size and reaction temperature were found to affect the efficiency of the reaction.
CANADIAN JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Victor Mashindi, Pumza Mente, Tumelo N. Phaahlamohlaka, Nobuhle Mpofu, Ofentse A. Makgae, Beatriz D. Moreno, Dean H. Barrett, Roy P. Forbes, Pieter B. Levecque, Kenneth I. Ozoemena, Neil J. Coville
Summary: This study investigates the application of hollow carbon spheres as catalyst supports in oxygen reduction reactions. The new catalysts show high activity and excellent durability.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Ofentse A. Makgae, Tumelo N. Phaahlamohlaka, Benzhen Yao, Manfred E. Schuster, Thomas J. A. Slater, Peter P. Edwards, Neil J. Coville, Emanuela Liberti, Angus Kirkland
Summary: In this study, the effect of CO reduction to CO on the reducibility of Co3O4 nanoparticles supported on hollow carbon spheres was investigated using high-resolution aberration-corrected analytical electron microscopy. It was found that carbon encapsulation of twinned fcc Co particles occurred during the syngas treatment, while H2-treated particles mainly consisted of CoO. Additionally, the reducibility of Co3O4 nanoparticles was improved in syngas compared to H2 at 350°C. The study also explored the impact of high temperature on the reducibility of Co3O4 nanoparticles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Ludwe L. Sikeyi, Laercia R. Bila, Themba D. Ntuli, Cyril T. Selepe, Nobanathi W. Maxakato, Neil J. Coville, Manoko S. Maubane-Nkadimeng
Summary: This study presents the synthesis of Pt supported on titania oxide nanoparticles decorated on sulfur doped onion-like carbon nanoparticles (S-OLCNs) and their application as electrocatalysts for ammonia oxidation reactions. The incorporation of TiO2 nanoparticles into Pt/S-OLCN was found to significantly enhance the activity of Pt for the ammonia oxidation reaction by facilitating the electron transfer process. Pt/TiO2/S-OLCN also exhibited better long term stability and faster charge transfer resistance compared to other catalysts tested.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Electrochemistry
B. Shaku, T. P. Mofokeng, N. J. Coville, K. I. Ozoemena, M. S. Maubane-Nkadimeng
Summary: This study presents the conversion of marula nutshell waste into nitrogen-doped activated carbon (N-ACs) for supercapacitor electrode material. The N-ACs demonstrated high surface area and porosity, resulting in excellent electrochemical performance in KOH and KNO3 electrolytes. The material achieved remarkable energy and power densities in 2.5 M KNO3 electrolyte, making it a promising energy storage material for supercapacitors.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Ryan O'Connor, Joyce B. Matsoso, Victor Mashindi, Pumza Mente, Lebohang Macheli, Beatriz D. Moreno, Bryan P. Doyle, Neil J. Coville, Dean H. Barrett
Summary: In this study, the influence of counter anion on the structural properties of hollow carbon spheres (HCS) support was investigated. It was found that the thickness of the HCS shell depended on the type of nickel precursor salt used. The choice of precursor salt also affected the textural properties of the HCS nanosupports and influenced the growth of nickel nanoparticles.
Article
Food Science & Technology
Na Hu, Erjun Tang, Shuo Wang, Miao Yuan, Shaojie Liu, Xiaomeng Chu, Xuteng Xing, Xinying Liu, Linda Jewell
Summary: Different degrees of substitution were used to prepare Chestnut starch acetates (CSA). The characterization showed that CSA granules were damaged and dented, adhering to an increase in DS. CSA and CS had a crystal form of type C based on X-ray diffraction analysis. Chemical structure analysis indicated grafting of acetyl groups onto starch molecules. An increase in DS improved the transparency, freeze-thaw stability, solubility, and swelling power of CSA. CSA exhibited enhanced viscosity, stability, and reduced pasting temperatures compared to native CS. However, an increase in DS resulted in decreased cohesion, hardness, gumminess, chewiness, and springiness, but increased adhesiveness. These findings provide a new option for the application of CSA in food fields as a renewable natural polymer.
INTERNATIONAL JOURNAL OF FOOD ENGINEERING
(2023)
Review
Optics
Orlette Mkhari, Themba D. Ntuli, Neil J. Coville, Edward N. Nxumalo, Manoko S. Maubane-Nkadimeng
Summary: Carbon dot/support nanocomposites exhibit improved properties and hold great potential for applications in fields such as photocatalysis, electrochemistry, optics, and nanomedicine.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Djalila Guettaia, Hanane Zazoua, Mohammed Reda Ramdani, Khaldoun Bachari, Neil J. Coville, Amel Boudjemaa
Summary: This paper reports on the photodegradation of ibuprofen (IBP) using SiO2@xTiO(2) synthesized via a hydrothermal method. The catalysts were prepared by adding TiO2 to a Stober synthesized silica at different weight loadings. The SiO2@xTiO(2) showed excellent photodegradation efficiency and the degradation rate of IBP increased with the formation of H2O2.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2023)
Article
Food Science & Technology
Shuo Wang, Na Hu, Erjun Tang, Shenglan Yang, Xinying Liu, Linda Jewell
Summary: Porous phosphorylated chestnut starch (P-PCS) was prepared by enzymic hydrolysis and phosphorylation of chestnut starch (CS), and the phosphorylation conditions were optimized using response surface design. The optimal reaction conditions were a CP/P-CS mass ratio of 2:1, a reaction temperature of 146 degrees C, and a reaction time of 159 min. P-PCS exhibited improved light transmittance and Pb(II) adsorption performance compared to CS, indicating its potential as a natural polymer adsorbent in wastewater treatment.
Article
Chemistry, Multidisciplinary
Themba D. Ntuli, Ludwe L. Sikeyi, Faria Dziike, Neil J. Coville, Edward N. Nxumalo, Manoko S. Maubane-Nkadimeng
Summary: Waste cooking oil was converted into onion-like nanocarbons (OLNCs) through flame pyrolysis and then combined with TiO2 to form TiO2/OLNC nanocomposites using hydrothermal treatment. The mass ratio of TiO2 to OLNCs was varied, while the mass of TiO2 was kept constant. The nanocomposites exhibited enhanced photocatalytic activity and degradation efficiency for methyl orange due to the high adsorption efficiency of OLNCs and the hindrance of electron-hole recombination.
APPLIED SCIENCES-BASEL
(2023)
Review
Nanoscience & Nanotechnology
X. Cheng, C. Tang, C. Yan, J. Du, A. Chen, X. Liu, L. Jewell, Q. Zhang
Summary: In order to meet the energy storage needs of portable electronic devices, electric vehicles, renewable-coupled smart grids, and more, it is important to develop lithium-ion batteries (LIBs) with increased energy densities. Porous carbon spheres, with their high chemical stability, electrical conductivity, specific surface area, and porous structure, show promise as anode materials for LIBs. In this review, various preparation methods for porous carbon spheres are introduced, and strategies for improving the performance of LIBs anode materials are described.
MATERIALS TODAY NANO
(2023)
Review
Chemistry, Physical
Lerato L. Mokoloko, Roy P. Forbes, Neil J. Coville
Summary: Since their discovery in 2004, carbon dots (CDs) have been widely used in various applications due to their fluorescent properties. However, the potential uses of CDs as catalysts and supports in catalytic reactions are still relatively unexplored. Studies have shown the advantages of using CDs in catalysis, but there are challenges associated with their stability and aggregation due to their small size.
Article
Chemistry, Multidisciplinary
Saureille Ngouana Moafor, Patrice Kenfack Tsobnang, Kabir Oyeniran Oyedotun, Roussin Lontio Fomekong, Guy L. Kabongo, Macheli Lebohang, John Ngolui Lambi, Linda L. Jewell
Summary: This study investigates the effect of the SiO2/Al2O3 ratio on the electrochemical performance of the aluminum silicate/cobalt oxide composite. The results show that the specific capacity increases as the SiO2/Al2O3 ratio increases. It was also found that after 2000 cycles, Co/H-AZ(1) and Co/AZ(1) exhibit poor coulombic efficiency, while Co/H-AZ(2) and Co/AZ(2) exhibit a coulombic efficiency of 98%.
Article
Chemistry, Multidisciplinary
Thomas H. Mongwe, Themba D. Ntuli, Ludwe L. Sikeyi, Neil J. Coville, Messai A. Mamo, Jose P. M. Serbena, Manoko S. Maubane-Nkadimeng
Summary: This study reports on the synthesis of carbon nano-onions and nitrogen-doped carbon nano-onions, and their application in gas sensing materials. The results showed that the composite based on pristine CNOs exhibited higher sensitivity to acetone, while the sensor based on N-CNOs had a lower limit of detection.
SOUTH AFRICAN JOURNAL OF CHEMISTRY-SUID-AFRIKAANSE TYDSKRIF VIR CHEMIE
(2022)
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.
