Article
Chemistry, Applied
Tugce N. Eran, Federico Galli, Francesco Mazzoni, Mariangela Longhi, Arian Grainca, Gregory Patience, Carlo Pirola
Summary: This study synthesized iron-based catalysts over various metallosilicates and tested their performance in Fischer-Tropsch synthesis. The results showed that Fe/Ce/SiO2 had the highest CO conversion rate, while Fe/Zr/SiO2 had the highest surface area.
Article
Chemistry, Applied
Yaoyao Han, Guiqin Xiao, Muhua Chen, Sufang Chen, Fuzhen Zhao, Yuhua Zhang, Jinlin Li, Jingping Hong
Summary: Plasma treatment was used to modify ZrO2 support and/or decompose cobalt precusor, resulting in the formation of highly dispersed cobalt species and improved catalytic activity.
Article
Green & Sustainable Science & Technology
Zahra Teimouri, Nicolas Abatzoglou, Ajay K. Dalai
Summary: In this study, machine learning was used to optimize the process conditions for synthesis of mesoporous activated carbon (AC) from biomass, which served as a catalyst support in Fischer-Tropsch synthesis (FTS). The random forest regression (RFR) method achieved the best prediction accuracy for the textural features of AC. The AC prepared under the optimized conditions showed promising potential as a biomass-based catalyst support for FTS, with superior activity and selectivity compared to other catalysts.
Article
Chemistry, Physical
Deizi Peron, Alan J. Barrios, Alan Taschin, Iulian Dugulan, Carlo Marini, Giulio Gorni, Simona Moldovan, Siddardha Koneti, Robert Wojcieszak, Joris W. Thybaut, Mirella Virginie, Andrei Y. Khodakov
Summary: The study found that antimony and tin have strong promoting effects on silica supported iron Fischer-Tropsch catalysts, significantly increasing the reaction rate and improving catalyst stability. The addition of these elements through impregnation can increase the intrinsic activity of iron surface sites by 7-10 times without affecting iron dispersion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Lebohang Macheli, Emanuela Carleschi, Bryan P. Doyle, Gerard Leteba, Eric van Steen
Summary: Metal-support interactions in inverse catalysts prepared by adsorbing TEOS on Co3O4 can be manipulated by varying the solvent mixture. Deposition of TEOS on Co3O4 nanoparticles in n-hexane results in the formation of silica oligomers interacting strongly with cobalt(II,III)oxide after calcination at 573 K. Modification of Co3O4 nanoparticles with TEOS in a hydrolysing environment results in a stronger interaction due to the formation of surface cobalt silicate through hydrolysis.
JOURNAL OF CATALYSIS
(2021)
Article
Energy & Fuels
Petr A. Chernavskii, Ruslan V. Kazantsev, Galina V. Pankina, Denis A. Pankratov, Sergey V. Maksimov, Oleg L. Eliseev
Summary: Carbonization of MgAl2O4 spinel via glucose treatment is used for preparing iron catalysts, which leads to enhanced specific activity and selectivity of the catalyst in product hydrocarbons.
Article
Chemistry, Multidisciplinary
Seunghee Cha, Heewon Kim, Hyunkyung Choi, Chul Sung Kim, Kyoung-Su Ha
Summary: Chi-Fe5C2, a highly active phase in Fischer-Tropsch synthesis, was successfully synthesized using a wet-chemical route without the need for pre-activation. The encapsulation of chi-Fe5C2 nanoparticles with mesoporous silica was found to effectively protect them from deactivation and re-oxidation, while maintaining their phase intact. The CO2 selectivity of stabilized chi-Fe5C2 was very low, indicating its potential as a catalyst for Fischer-Tropsch synthesis.
Article
Energy & Fuels
Zhenxin Liu, Gaopeng Jia, Chenxi Zhao, Yu Xing
Summary: Synthesis of Fe/K catalysts using different ratios of zinc aluminate spinel to alumina and examination of their performance under syngas conversion tests show that catalyst 15%Fe/2% K2O/83%(ZnAl2O4 center dot 1Al(2)O(4)) exhibits impressive values, particularly in terms of olefin/paraffin ratios at a CO conversion of 38.3%.
Article
Chemistry, Multidisciplinary
Chike George Okoye-Chine, Mahluli Moyo, Diane Hildebrandt
Summary: This study focuses on the influence of surface hydrophobicity of SiO2 supports on the performance of SiO2-supported Fe catalysts in Fischer-Tropsch synthesis. Hydrophobized SiO2 supports improved the catalytic activity of Fe catalysts, reduced CH4 and CO2 selectivity, and increased C5+ selectivity.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(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
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
Chemistry, Physical
Hai Chang, Quan Lin, Meng Cheng, Kui Zhang, Bo Feng, Jiachun Chai, Yijun Lv, Zhuowu Men
Summary: The loading contents of potassium (K) promoter have a significant impact on the Fe-O-Si interaction of precipitated Fe/Cu/K/SiO2 catalysts for low-temperature Fischer-Tropsch synthesis. Increasing K content weakens the Fe-O-Si interaction and increases the crystallite size of χ-Fe5C2 phase and the reactivity of surface carbon. Additionally, a higher level of bulk phase Fayalite (Fe2SiO4) species is observed in catalysts with lower K loading.
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
Engineering, Chemical
Min Zhao, Ziang Zhao, Yuan Lyu, Wei Lu, Ming Jin, Tao Liu, Hejun Zhu, Yunjie Ding
Summary: The appropriate metal-support interaction plays a crucial role in the supported Fischer-Tropsch catalysts. By synthesizing a series of porous spinel MAl2O4 together with Al2O3, and using them as supports for Co-based Fischer-Tropsch synthesis catalysts, the study investigated the influence of metal-support interaction on Co dispersity, reducibility, and catalytic performance. The results demonstrated that 15Co/CoAl2O4 showed the highest activity and C5+ selectivity due to weaker metal-support interaction, leading to higher reducibility and CO dissociation ability.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Rui Hu, Tianye Wang, Yifan Wang, Yuan Zhu, Li Xie, Enhui Xing, Yu Wu, Zhijian Da
Summary: A nano-hollow zeolite-encapsulating ultra-fine Fe nanoparticle catalyst, Fe@Sn-h-HT, was synthesized via water steam treatment of the Fe@Sn-h catalyst prepared by the dissolution-recrystallization (D-R) method. Fe@Sn-h-HT catalyst possessed a hierarchical porous structure and a well-dispersed Fe2O3 particles with a size of 3.4 nm. Additionally, characterization methods such as XRD, HAADF-STEM, and H-2-TPR confirmed the transformation of skeleton Fe in Fe@Sn-h into uniformly dispersed Fe2O3 in Fe@Sn-h-HT catalyst. The higher selectivity and yield of C-2-C-4(=) compared to reference catalysts Fe/S and Fe@Sn-h provided strong evidence for the confined catalysis of the metal@zeolite catalyst.
