Article
Chemistry, Physical
Omid Akbarzadeh, Solhe F. Alshahateet, Noor Asmawati Mohd Zabidi, Seyedehmaryam Moosavi, Amir Kordijazi, Arman Amani Babadi, Nor Aliya Hamizi, Yasmin Abdul Wahab, Zaira Zaman Chowdhury, Suresh Sagadevan
Summary: In this study, the effect of reaction temperature, syngas space velocity, and catalyst stability on Fischer-Tropsch reaction using Co-Mn/CNT catalysts was investigated. Results showed that optimizing the temperature, space velocity, and H2/CO ratio led to increased CO conversion and C5+ selectivity. Additionally, the 95Co5Mn/CNT catalyst demonstrated better stability over 48 hours of continuous operation compared to other catalyst formulations.
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
Amel Cydric Ghogia, Bruno F. Machado, Simon Cayez, Ange Nzihou, Philippe Serp, Katerina Soulantica, Doan Pham Minh
Summary: The chemistry between the Co precursor and the support during catalyst preparation has a crucial impact on the catalyst properties, while the CNT surface chemistry also influences the characteristics of the catalyst. The study found an inverse correlation between Co particle size and activity, highlighting the importance of precursor/support couple in the structure and performance of Co/CNT catalysts.
JOURNAL OF CATALYSIS
(2021)
Article
Engineering, Chemical
Imaad Davies, Klaus P. Moller
Summary: The kinetics of n-paraffin and 1-olefin formation in the Fischer-Tropsch reaction system are equilibrium-limited, allowing for an effective description of product distribution and observed reaction behavior trends. The model preserves the polymerization character of the reaction and successfully describes the dominant trends in product distribution as a function of CO conversion, temperature, and pressure.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Chemistry, Physical
Tobias F. Kimpel, Jin-Xun Liu, Wei Chen, Robert Pestman, Emiel J. M. Hensen
Summary: Through IR spectroscopy and DFT calculations, it has been discovered that in the Fischer-Tropsch reaction, Mn promotes a silica-supported Co catalyst with a MnO layer covering the Co surface, activating adsorbed CO through reaction with an oxygen vacancy. This results in higher activity, higher CHx coverage, increased C5+ selectivity, and decreased CH4 selectivity. Increasing pressure amplifies the selectivity differences. However, above around 4 bar, the addition of Mn decreases C5+ selectivity, possibly due to its promotion of C-O bond dissociation but not chain growth. Migration of formed monomers for chain growth on the Co surface may be hindered by high CO coverage, especially at high pressure.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
Alexander Herbers, Christoph Kern, Andreas Jess
Summary: Sustainable transportation fuels are necessary for the energy transition. A new method for producing synthetic sulfur free maritime fuel is introduced, using Co-catalyzed Fischer-Tropsch synthesis (FTS) with syngas based on plasma technology containing traces of O-2. Experimental results demonstrate that the catalyst remains active and does not affect the distribution of C2+-hydrocarbons under low temperature FTS conditions with the presence of H-2. O-2 is converted into H2O and CO2 in varying proportions, with a higher CO concentration increasing CO2 selectivity. This research may provide a new CO2 source for carbon-neutral fuels.
Article
Engineering, Chemical
Farzad Haghighi, Ali Ahmadpour, Ali Nakhaei Pour
Summary: Carbon aerogel was synthesized as a novel catalyst support for Fischer-Tropsch synthesis. Cobalt-doped carbon aerogel catalysts were synthesized using different strategies, and the size of cobalt particles affected the methane selectivity. Hydrogen spillover from the support to metallic particles improved reducibility and enhanced the production of hydrogenated products.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Shupeng Guo, Congcong Niu, Zhongyi Ma, Jungang Wang, Bo Hou, Litao Jia, Debao Li
Summary: Introducing Ba and CN species into Co/Al2O3 catalyst can enhance the electron density on the cobalt surface, which improves the C-5(+) selectivity and C-3 o/p ratio, leading to enhanced catalytic performance in Fischer-Tropsch synthesis reaction.
Article
Chemistry, Physical
Somayeh Mansouri, Seyyed Hossein Zohdi, Hossein Atashi, Maliheh Ghofran Pakdel, Ali Akbar Mirzaei
Summary: The size of catalysts has no impact on the type of deactivation model. Smaller catalysts have a smaller deactivation constant and higher long-term stability. Larger catalyst sizes tend to accumulate carbon and heavy hydrocarbon fouling, leading to decreased specific surface area and lower catalytic activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Ceramics
Ming Hao, Peizhang Gao, Wei Liu, Baizeng Fang, Jinsheng Liang, Tingting Zhang, Youpeng Ding, Hui Zhang, Fei Wang
Summary: A novel Co/CoAl2O4/sepiolite nanocomposite was synthesized in this study, with optimal conditions identified for fabrication. The nanocomposite showed fine cobalt nanoparticles anchored on the surface of CoAl2O4, leading to higher selectivity for high-carbon hydrocarbons in Fischer-Tropsch synthesis. This work provides an effective strategy for low-cost batch fabrication of efficient cobalt-based catalysts.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Yihui Li, Wei Lu, Ziang Zhao, Min Zhao, Yuan Lyu, Leifeng Gong, Hejun Zhu, Yunjie Ding
Summary: The surface oxygen groups of carbon materials are necessary for the synthesis of supported catalysts. The activity and selectivity of activated carbon-based material supported Co catalysts can be tuned by modifying the surface oxygen group concentration. Further, regeneration of surface oxygen groups can restore the FTS activity of the catalysts.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Multidisciplinary
Jirong Bai, Mingyao Song, Jiazheng Pang, Lingling Wang, Jianping Zhang, Xiankai Jiang, Zhijiang Ni, Zhilei Wang, Quanfa Zhou
Summary: In this study, a facile strategy was used to prepare high-performance Co-based catalysts. The GMC-900 obtained by using pollution-free soybean oil as a carbon source exhibited enhanced catalytic performance when loaded with Co species. Co/GMC-900 was found to be an effective catalyst with superior C5+ selectivity in Fischer-Tropsch synthesis.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Erling Rytter, Anders Runningen, Edd Blekkan, Magne Hillestad
Summary: The paper presents the development of a mechanism and rate expression for Fischer-Tropsch synthesis over cobalt-based catalysts. The mechanism involves a two-step hydrogen assisted activation of CO and incorporates the influence of water partial pressure on the reaction rate. The resulting kinetic model is tested on various cobalt catalysts and accurately describes the observed CO conversions and selectivities.
MOLECULAR CATALYSIS
(2022)
Article
Energy & Fuels
Lei Li, Yan Liu, Junfeng Zhang, Ming Xia, Weijie Ji
Summary: This study proposes a Metal-Organic Frameworks (MOFs) strategy for the manufacture of highly dispersed supported catalyst, and successfully prepares CoOx/SiO2 catalyst with superior activity and stability. The results show that the high dispersion of Co metal active sites and the increased number of surface-exposed Co sites contribute to the improved catalytic activity. In addition, the sacrificial MOFs strategy can effectively restrain the growth of cobalt particles, achieving the goal of high dispersion.
Article
Chemistry, Physical
Mostafa Torkashvand, Saeedeh Sarabadani Tafreshi, Nora H. de Leeuw
Summary: The increasing demand for renewable fuels and sustainable products has led to the development of active and selective catalysts for the conversion of carbon monoxide. First-principles calculations based on density functional theory are used to investigate the Fischer-Tropsch synthesis over the Co (001) surface, revealing CH4 as the dominant product. Kinetic analysis shows that the hydrogenation of cis-HCOH has the lowest energy barrier for CH production, while the hydrogenation of CO to COH has the highest energy barrier.
Article
Entomology
Marzieh Mohammadpour, J. P. Michaud, Mojtaba Hosseini, Javad Karimi, Vahid Hosseininaveh
Summary: The parasitism of T. brassicae affected the foraging behavior of N. pseudoferus, leading to rejection of older parasitized eggs, increased grooming and probing activities, and different functional responses to eggs of different ages. This interaction may provide a partial refuge for T. brassicae in older eggs, potentially enhancing joint augmentation of both species against T. absoluta.
Article
Zoology
Mohammad Hussain Falahzadah, Ebrahim Shokoohi, Gholam Hossein Moravej, Phatu William Mashela, Abdul Khalid Madadi, Javad Karimi
Summary: In this study, soil samples were collected from different habitats in Badakhshan province of Afghanistan to isolate and characterize bacteria feeding nematodes. The Galleria mellonella-baiting method was used to isolate the nematodes associated with Afghan insects. Both morphological and molecular approaches were utilized to confirm the identity of the nematode isolates as Oscheius tipulae and Diploscapter coronatus. Interestingly, both nematode species were capable of infecting and killing G. mellonella larvae in less than 96 hours.
Review
Entomology
Hana Haji Allahverdipour, Javad Karimi
Summary: Soil serves as a shared habitat for white grubs and entomopathogenic nematodes (EPNs), posing a dual role in biological control. While the diversity of EPNs in soil can be exploited for grub microbial control, the soil also promotes natural resistance of grubs to EPNs through evolving mechanisms. The evolutionary interactions between EPNs and white grubs have resulted in a multifaceted battle with sophisticated adaptations, possibly stemming from other types of associations.
ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA
(2021)
Article
Biotechnology & Applied Microbiology
Elham Salari, Javad Karimi, Majid Fasihi Harandi, Hussein Sadeghi Nameghi
Summary: The research demonstrates that all three examined nematodes are able to effectively locate, invade, reproduce, and infect Z. pyrina larvae; however, S. carpocapsae is more effective than H. bacteriophora and Acrobeloides K29 under laboratory, semi-field, and field conditions.
BIOLOGICAL CONTROL
(2021)
Article
Biochemistry & Molecular Biology
Shokoofeh Kamali, Ali Javadmanesh, Lukasz L. Stelinski, Tina Kyndt, Alireza Seifi, Monireh Cheniany, Mohammad Zaki-Aghl, Mojtaba Hosseini, Mahyar Heydarpour, Javad Asili, Javad Karimi
Summary: The study found that entomopathogenic nematodes play a critical role in reducing plant parasite infestation and decreasing herbivore damage, by inducing plant defense responses and immune reactions in tomato plants. This supports the hypothesis that plants mistake subterranean EPNs for parasites, activating a range of plant defenses against pathogenic nematodes and herbivores.
Article
Chemistry, Applied
Zahra Keyvanloo, Ali Nakhaei Pour, Fatemeh Moosavi
Summary: The adsorption and diffusion behaviors of H-2, CO2, CO, MeOH, and EtOH in ZIF-8 were studied in pure and mixed states. The results showed different trends for the diffusion coefficients and adsorption isotherms of the guest molecules. The separation of MeOH from other molecules in the mixture was also investigated.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Biotechnology & Applied Microbiology
Minoo Heidari Latibari, Gholamhossein Moravvej, Ehsan Rakhshani, Javad Karimi, Diana Carolina Arias-Penna
Summary: This study reports the first record of Aphidius smithi parasitizing the cowpea aphid Aphis craccivora on alfalfa. The host range and global distribution of Aphidius smithi are reviewed, and the relationship between the parasitoid, aphid, and host changes is addressed.
BIOCONTROL SCIENCE AND TECHNOLOGY
(2022)
Article
Entomology
Sahar Zolfaghariyan, Abolfazl Shakeri, Javad Asili, Saeed Tarighi, Peter Gruen, Yi-Ming Shi, Helge B. Bode, Javad Karimi
Summary: This study investigates the biological activities of ethyl acetate extracts from four Xenorhabdus sp., and identifies several compounds with cytotoxic and antibacterial properties. The bacterial extracts from X. nematophila FUM 220 and X. bovienii FUM 223 show higher toxicity against human cancer cell lines, while compounds 6 and 11 exhibit potent cytotoxic activity against human lung cancer cells. These findings suggest that Xenorhabdus species have potential as sources of bioactive compounds for treating cancer and multidrug-resistant bacteria.
ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA
(2023)
Article
Engineering, Chemical
Farzad Haghighi, Ali Ahmadpour, Ali Nakhaei Pour
Summary: Carbon aerogel was synthesized as a novel catalyst support for Fischer-Tropsch synthesis. Cobalt-doped carbon aerogel catalysts were synthesized using different strategies, and the size of cobalt particles affected the methane selectivity. Hydrogen spillover from the support to metallic particles improved reducibility and enhanced the production of hydrogenated products.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Entomology
Minoo Heidari Latibari, Gholamhossein Moravvej, Ehsan Rakhshani, Javad Karimi, Diana Carolina Arias-Penna, Buntika Butcher
Summary: It is widely accepted that endosymbiont interactions have significant effects on the fitness of both pests and beneficial species. Arsenophonus, a type of endosymbiotic bacteria, is associated with black cowpea aphids and can delay the development of parasitoid wasps, indirectly limiting their effectiveness.
Article
Chemistry, Inorganic & Nuclear
Ali Nakhaei Pour, Ali Mohammadi
Summary: In this study, ZSM-5 zeolite was prepared without organic templates using a hydrothermal process, and the synthesis kinetics were investigated based on crystal growth. The results showed that increasing the Na+ content in the initial gel composition decreased the activation energy for crystal growth and enhanced the crystallization rate of ZSM-5 zeolite.
INORGANIC AND NANO-METAL CHEMISTRY
(2023)
Article
Parasitology
K. Kuhestani, J. Karimi, E. Shokoohi, A. Makhdoumi
Summary: A new species of the genus Oscheius, Oscheius Cyrus n. sp., was discovered in moist soils in the north of Iran. Molecular and morphological data confirmed its belonging to the Insectivora-group and distinguished it from other similar species. The dominant associated bacterium of the new Oscheius species was identified as Ochrobactrum pseudogrignonense.
JOURNAL OF HELMINTHOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Ali Nakhaei Pour, Ali Mohammadi
Summary: This study investigated the effect of synthesis conditions on the crystal growth, structural features, acidity, and catalytic properties of hierarchical ZSM-5 zeolite in n-heptane cracking. The results showed that the crystallization rate of hierarchical ZSM-5 increased with the amount of SiO2 and Na2O in the initial gel, as well as the reaction temperature. Additionally, by adjusting the initial gel composition and reaction temperature, the porosity, acidity, and crystal size of hierarchical ZSM-5 could be controlled. The selectivity of ethylene and propylene in the heptane cracking reaction was found to be influenced by the acidity and micropore to mesopore ratio of the prepared zeolites, as predicted by both experimental and simulation results.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Mehdi A. Shadmehri, Mohammad Reza Housaindokht, Ali Nakhaei Pour
Summary: Graphitic carbon nitride (g-C3N4) was synthesized and used in the ODS process with cobalt doping (CoO/g-C3N4) to investigate its catalytic properties. The study found that the cobalt content loaded in the catalyst had the most significant impact on conversion efficiency, while the addition of cyclohexanone negatively affected efficiency.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Entomology
Haydar Al-Farhani, Reyhaneh Darsouei, Shokoofeh Kamali, Gholamhossein Moravvej, Javad Karimi
Summary: The study revealed that both M. anisopliae and B. bassiana are effective in infecting and killing the termite M. diversus, with M. anisopliae showing a more pronounced effect overall. The mortality caused by the fungi was dose-dependent, with the highest mortality observed at the highest concentration. Future field trials are needed to confirm the potential of these fungi as biological control agents for M. diversus.
INTERNATIONAL JOURNAL OF TROPICAL INSECT SCIENCE
(2021)
