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
Joakim Tafjord, Samuel K. Regli, Achim Iulian Dugulan, Magnus Ronning, Erling Rytter, Anders Holmen, Rune Myrstad, Jia Yang
Summary: Transition metals supported on carbons are important in catalysis and energy storage. Pyrolysis of metal alginate can produce highly active catalysts for Fischer-Tropsch synthesis. This study explores the evolution of carbon and transition metal during pyrolysis and provides valuable knowledge for rational design of metal-alginate-based materials.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Multidisciplinary Sciences
Lidia Martinez, Pablo Merino, Gonzalo Santoro, Jose I. Martinez, Stergios Katsanoulis, Jesse Ault, Alvaro Mayoral, Luis Vazquez, Mario Accolla, Alexandre Dazzi, Jeremie Mathurin, Ferenc Borondics, Enrique Blazquez-Blazquez, Nitzan Shauloff, Rosa Lebron-Aguilar, Jesus E. Quintanilla-Lopez, Raz Jelinek, Jose Cernicharo, Howard A. Stone, Victor A. de la Pena O'Shea, Pedro L. de Andres, George Haller, Gary J. Ellis, Jose A. Martin-Gago
Summary: The study proposes an alternative gas phase process for the synthesis of long hydrocarbon chains using atomic carbon and molecular hydrogen precursors in an inert carrier gas, without the use of metal catalysts. Under mild reaction conditions, efficient C-C chain growth was achieved with the presence of CH2 and H radicals, leading to the production of unbranched alkanes micrometers in length.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Martyna Murat, Zahra Gholami, Josef Simek, Daily Rodriguez-Padron, Jose Miguel Hidalgo-Herrador
Summary: This study focuses on the feasibility of using waste from the food or wood industry to produce biofuels under high-temperature conditions. It was found that the feedstock composition had little impact on the product composition, and the pyrolysis reaction could produce high-energy materials.
Article
Chemistry, Physical
Jiachun Chai, Robert Pestman, Wei Chen, A. Iulian Dugulan, Bo Feng, Zhuowu Men, Peng Wang, Emiel J. M. Hensen
Summary: The formation of Fe-carbide phases is crucial for Fischer-Tropsch synthesis catalysts. Carburization of Raney Fe showed that CO dissociation occurs at -150 degrees C, while C diffusion into metallic Fe requires higher temperature. The carburization rate increases with H2/CO ratio, leading to predominant formation of carbon-rich ε'-carbide.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Yingying Xue, Shengyang Duan, Zihao Liu, Miaomiao Cui, Zhanghui Xiong, Zengchen Liu, Jiangang Chen
Summary: Stable Fe-based superhydrophobic surfaces are constructed using a hydrothermal method and an autocatalytic CO hydrogenation reaction. The use of syngas as an alternative to traditional low-free-energy materials is proposed. Syngas may serve as a powerful tool for fabricating superhydrophobic surfaces that can catalyze the CO hydrogenation reaction.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Yu Zhang, Ming Qing, Hong Wang, Xing-Wu Liu, Suyao Liu, Hongliu Wan, Linge Li, Xiang Gao, Yong Yang, Xiao-Dong Wen, Yong-Wang Li
Summary: The configuration between SiO2 and iron species plays a crucial role in determining the structure and performance of SiO2-promoted Fe-based Fischer-Tropsch synthesis catalysts. The construction of a SiO2 shell around iron species can inhibit iron oxides reduction and increase diffusion resistance, while physically separating iron species from SiO2 shell can effectively hinder sintering. Impregnated and precipitated Fe-Si catalysts experienced aggregation, and their performance correlated with the strength of Fe-SiO2 interaction.
Article
Chemistry, Physical
Mikhail Shipilin, David Degerman, Patrick Lomker, Christopher M. Goodwin, Gabriel L. S. Rodrigues, Michael Wagsta, Joergen Gladh, Hsin-Yi Wang, Andreas Stierle, Christoph Schlueter, Lars G. M. Pettersson, Anders Nilsson, Peter Amann
Summary: In this study, the effect of pressure, temperature, time, and gas feed composition on the growth dynamics of iron-carbon phases was investigated. The details of iron surface carburization and product formation under realistic conditions were revealed using a combination of experimental and theoretical approaches. This research provides important insights into the relationship between the catalyst's surface and the reaction.
Article
Chemistry, Physical
Jiachun Chai, Robert Pestman, Wei Chen, Noortje Donkervoet, A. Iulian Dugulan, Zhuowu Men, Peng Wang, Emiel J. M. Hensen
Summary: The kinetics of the transformation of metallic Fe to the active Fe carbide phase at the start of the Fischer-Tropsch (FT) reaction were studied. The diffusion rates of C atoms going in or out of the lattice were determined using C-13-labeled synthesis gas. It was found that in the initial stages, C diffused rapidly into the lattice, and the FT reaction started during this period. When reaching steady state, the diffusion rates of C in and out of the lattice converged, and the FT reaction continued via two parallel reaction mechanisms. The outer layers of the Fe carbide were involved in hydrocarbon formation via a slow reaction, contributing to around 10% of the total activity.
Article
Chemistry, Physical
Mikhail Shipilin, David Degerman, Patrick Loemker, Christopher M. Goodwin, Gabriel L. S. Rodrigues, Michael Wagstaffe, Jorgen Gladh, Hsin-Yi Wang, Andreas Stierle, Christoph Schlueter, Lars G. M. Pettersson, Anders Nilsson, Peter Amann
Summary: This study investigates the detailed mechanism of carbide formation on iron-based catalysts and the effect of reaction conditions on the catalyst surface state through experiments and theoretical calculations.
Article
Engineering, Chemical
Yingying Xue, Zengchen Liu, Yaxuan Zhang, Shengyang Duan, Jiangang Chen
Summary: This study reveals that the performance of iron-based catalysts can be modified by simply changing the percentage of Fe(II)/Fe(III) in the raw materials. The catalysts prepared by FeCl2·4H2O exhibit higher CO conversion, lower methane selectivity, and higher C-2-C-4 olefin-to-paraffin ratio, which can be mainly attributed to the higher Fe2+ content in the unreduced state.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Agija Stanke, Valdis Kampars
Summary: The transportation sector's significant contribution to greenhouse gas emissions has prompted the search for sustainable and renewable alternatives to fossil fuels. This study focused on the synthesis of mesoporous Fe/SBA-15 catalysts using natural clays as binders and promoters. The results showed that catalysts agglomerated with kaolin exhibited better performance, and catalysts in powdered form had higher CO conversion rates.
Article
Chemistry, Physical
Liwei Niu, Jinjia Liu, Xingwu Liu, Jian Xu, Xiaodong Wen, Yong Yang, Yongwang Li
Summary: In this study, we investigated the catalytic mechanism of sodium for the carburization of alpha-Fe catalyst by C2H4 compared to traditional CO. Our findings reveal that sodium enhances the carburization process in CO, but inhibits it in C2H4 due to the different dissociation energies of the two reactants.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Applied
Ljubisa Gavrilovic, Erik A. Jorgensen, Umesh Pandey, Koteswara R. Putta, Kumar R. Rout, Erling Rytter, Magne Hillestad, Edd A. Blekkan
Summary: Fischer-Tropsch synthesis has been investigated over a commercial cobalt-based catalyst, showing a positive effect of water on catalyst activity and increased C(5+) selectivity regardless of the H2/CO ratio. Increasing conversion led to increased C(5+) selectivity, while higher conversions resulted in significantly enhanced selectivity to CO2.
Article
Chemistry, Inorganic & Nuclear
Zhi-Rong Feng, Bao-Bo Wang, Hao Dong, Shun-Ping Zhao, Yu-Ping Wu, Qiao Qiao, Xiao-Ming Ren
Summary: In this study, three covalently grafted kaolinites were prepared by forming Al-O-C bonds between the OH groups of propanediol (PD)/butanediol (BD)/glycerol (GL) and the surface of kaolinite. The hybrids showed excellent chemical stability to water and exhibited ferroelectricity at room temperature.
DALTON TRANSACTIONS
(2023)
