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.
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, Applied
Farnaz Yousefian, Mokhtar A. Babatabar, Melika Eshaghi, Soodabeh Morovati Poor, Ahmad Tavasoli
Summary: The performance of bio chars made from Rice husk, Coconut shell, and Cladophora glomerata algae as Fischer-Tropsch synthesis (FTS) cobalt catalyst support was examined. The biochars were produced by pyrolysis process and activated at specific temperature and time. 15 wt% cobalt catalysts were prepared through impregnation method. The physicochemical properties of the catalysts were analyzed using various techniques. The catalytic performance of biochars supported cobalt catalysts was compared with gamma-Alumina supported industrial catalyst, and the modified algae biochar supported cobalt catalyst showed the highest FTS rate and CO conversion rate with a slight decrease in C5+ liquid hydrocarbons selectivity.
FUEL PROCESSING TECHNOLOGY
(2023)
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
Chemistry, Organic
O. P. Papeta, S. I. Sulima, V. G. Bakun, I. N. Zubkov, A. N. Saliev, R. E. Yakovenko
Summary: Catalysts synthesized from a composite mixture showed good activity and selectivity in the Fischer-Tropsch synthesis reaction. The content of zeolite component is critical to the catalyst's activity and selectivity, while the ratio between active components correlates with the composition and properties of the products.
PETROLEUM CHEMISTRY
(2023)
Review
Crystallography
Chike George Okoye-Chine, Samuel Mubenesha
Summary: The use of iron ore as an alternative catalyst in Fischer-Tropsch synthesis has the potential for cost-effectiveness. Although progress has been made, there are still opportunities to enhance the performance of iron ore catalysts. The study highlights the need to address deactivation pathways and suggests the use of advanced spectroscopic and computational methods.
Article
Nanoscience & Nanotechnology
Yao Chen, Xin Li, Jingwei Zhang, Liya Dai, Ning Zhao, Chengchao Liu, Shuai Lyu, Zhenhua Li
Summary: In this study, Co@C-X catalysts were prepared by pyrolyzing the ZIF-67 precursor at different temperatures. It was found that the graphite carbon layer restricted the activity of active Co sites, but introducing TEOS and exposing more active sites after removing the graphite carbon layer significantly improved the FTS performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Can Zhu, Chao Huang, Mingwei Zhang, Yizhuo Han, Kegong Fang
Summary: Constructing hierarchically structured FeMnK@H-S-1(x) catalysts can enhance light olefins selectivity in Fischer-Tropsch synthesis, with the hierarchy factor playing a key role in promoting light olefins formation. Maximizing the hierarchy factor benefits the coordination of shape selective function and transport efficiency, leading to boosted light olefins selectivity on the synthesized catalysts. Additionally, moderate H-2 activation capacity and suppressed olefins secondary reactions also contribute to the enhanced light olefins selectivity.
Article
Chemistry, Applied
Haochen Qi, Chuang Xing, Weiguo Huang, Mingquan Li, Yujia Jiang, Xu Sun, Heyang Liu, Peng Lu, Jiangang Chen, Shuyao Chen
Summary: In this study, a hierarchical capsule catalyst is designed to improve olefin selectivity and iso-paraffin selectivity, facilitating the control of product distribution in FT reaction.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Energy & Fuels
Shupeng Guo, Zhongyi Ma, Jungang Wang, Bo Hou, Litao Jia, Baojun Wang, Debao Li
Summary: The synergistic promotion effect of Ru and Ba in Co/Al2O3 catalyst achieved higher CO conversion and lower CH4 selectivity, compared to unmodified or single additive modified catalyst. The influences of other alkali earth metal additives were also similar to that of Ba in promoting FTS reaction on Co-Ru catalysts.
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
Chemistry, Physical
Roman E. Yakovenko, Grigory B. Narochnyi, Ivan N. Zubkov, Ekaterina A. Bozhenko, Yash V. Kataria, Roman D. Svetogorov, Alexander P. Savost'yanov
Summary: This article presents a simple method for producing high-octane gasoline from CO and H-2 using a Co-Al2O3/SiO2/HZSM-5/Al2O3 hybrid catalyst. By adjusting the pressure and temperature, the content of branched hydrocarbons can be increased. The experimental batch of gasoline fraction produced under the optimized process parameters has an octane number of 78.5 units.
Article
Energy & Fuels
Yan Liu, Bo Hou, Congbiao Chen, Litao Jia, Zhongyi Ma, Qiang Wang, Debao Li
Summary: A series of carbon coated core-shell cobalt catalysts with different thickness of shell were easily prepared by C2H2 dissociation. The dissociation temperature played a crucial role in determining the thickness of carbon shell. The coated catalysts had two types of carbon species on the surface: deposited carbon and graphitic carbon. Deposited carbon blocked the active sites, while graphitic carbon only limited the diffusion of the products. The coated catalyst showed better dispersion and reduction, and retained more elemental Co after surface passivation. The performance test results of Fischer-Tropsch synthesis indicated high activity and selectivity of the core-shell catalyst, both before and after reduction.
Article
Chemistry, Physical
Yanbing Li, Yingluo He, Kensei Fujihara, Chengwei Wang, Xu Sun, Weizhe Gao, Xiaoyu Guo, Shuhei Yasuda, Guohui Yang, Noritatsu Tsubaki
Summary: In this study, a core-shell structured Na/Fe@Co bimetallic catalyst was developed to enhance CO2 conversion and selectivity of light hydrocarbons, while inhibiting CO selectivity. Characterization analyses revealed that the introduction of CoCo Prussian Blue Analog (CoCo PBA) increased the reducibility of iron oxide, accelerated the formation of iron carbide, and adjusted the surface basic properties of the catalyst. Additionally, trace Co atoms acted as a second active center in the CO2 Fischer-Tropsch synthesis process for increasing the synthesis of light hydrocarbons from CO hydrogenation. This work provides a novel core-shell structured bimetallic catalyst system for the production of light hydrocarbons, particularly light olefins, from CO2 hydrogenation.
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
Chemistry, Physical
Yifan Sun, Ye Lv, Wei Li, Jinli Zhang, Yan Fu
Summary: In this study, PtRu electrocatalysts were fabricated on carbon paper via cyclic electrodeposition for the electrocatalytic hydrogenation (ECH) of phenol. The Pt3Ru3 catalyst exhibited excellent activity and stability for the conversion of phenol to cyclohexanol at ambient temperature and various current densities. The in situ Raman spectroscopy and kinetic study revealed the hydrogenation mechanism of phenol over Pt3Ru3 in acidic electrolyte, providing an effective electrochemical strategy for the facile construction of durable electrode materials and efficient phenol hydrogenation.
JOURNAL OF CATALYSIS
(2024)
Article
Chemistry, Physical
Amir Shahzad, Khezina Rafiq, Muhammad Zeeshan Abid, Naseem Ahmad Khan, Syed Shoaib Ahmad Shah, Raed H. Althomali, Abdul Rauf, Ejaz Hussain
Summary: Photocatalytic hydrogen production through water splitting is an effective method for meeting future energy demands. In this study, researchers synthesized a 1 % Ag2S/Cu2S co-doped CdZnS catalyst and found that it can produce hydrogen at a higher rate. The co-doping of Ag2S and Cu2S in the CdZnS catalyst showed a synergistic effect, with Ag2S promoting oxidation reactions and Cu2S promoting reduction reactions.
JOURNAL OF CATALYSIS
(2024)
