Article
Multidisciplinary Sciences
Abdulrahman I. Alharthi
Summary: The study focuses on the direct catalytic decomposition of methane to produce hydrogen and filamentous carbon. ZSM-5 Zeolite used as a support with different Si/Al ratios showed varying hydrogen formation rates and quantities of deposited carbon. SEM images revealed the presence of filamentous carbon as a byproduct of the reaction.
JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE
(2021)
Article
Chemistry, Applied
Ohhun Kwon, Renjing Huang, Tianyu Cao, John M. Vohs, Raymond J. Gorte
Summary: The study found that LaMnO3 films deposited on MgAl2O4 showed uniform coverage and maintained their structure intact after multiple redox cycles, with Ni also retaining good dispersion. The LaMnO3-supported catalyst exhibited higher activity and superior resistance against coke formation compared to Ni on unmodified MgAl2O4. The performance of Ni on LaMnO3 films was compared to previous results on other oxide films such as LaFeO3, CaTiO3, SrTiO3, and BaTiO3.
Review
Chemistry, Physical
Evandro Alves Nakajima, Ligia Gomes Oliveira, Lazaro Jose Gasparrini, Guilherme Emanuel de Queiros Souza, Antonio Augusto Ignacio, Helton Jose Alves, Carlos Eduardo Borba
Summary: This article investigates the kinetic model for dry methane reforming using Ni/Si-MCM-41 catalysts, with the single-site reversible Langmuir-Hinshelwood model showing the best fit among six models tested. The higher temperatures and lower flow rates resulted in increased methane conversion and hydrogen production, with methane conversions over 85% and H2/CO ratio near 1. The activation energy for the best model was estimated to be 76.6 kJ/mol, demonstrating its potential for mathematical modeling in reactor simulation for syngas or hydrogen-rich gas production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Environmental
Jeong-Cheol Seo, Eunkyung Cho, Jeongmin Kim, Seung Bo Kim, Jae-Rang Youn, Dong Hyun Kim, Praveen Kumar Ramasamy, Kyubock Lee, Chang Hyun Ko
Summary: This study found that doping various basic metals in nickel-supported alumina catalysts can effectively improve thermal stability, prolonging the reaction stability of nickel-based DRM catalysts. The discovery of the significant effect of Sr on resistance to coke formation offers new opportunities for developing effective nickel-based DRM catalysts with coke resistance by comprehensively considering various factors.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Jeong-Cheol Seo, Eunkyung Cho, Jeongmin Kim, Seung Bo Kim, Jae-Rang Youn, Dong Hyun Kim, Praveen Kumar Ramasamy, Kyubock Lee, Chang Hyun Ko
Summary: Doping strontium in nickel-supported alumina catalysts significantly enhances coke resistance, while doping with different basic metals like magnesium, calcium, strontium, barium, and lanthanum improves the thermal stability of the catalysts for maintaining long-term reaction stability.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Applied
Junwei Song, Xianhui Duan, Weiwei Zhang
Summary: In this study, highly active methane dry reforming (DRM) catalysts with superior coke-resistance were obtained by employing a nanocasting method to synthesize mesoporous La2O3 support using KIT-6 as a hard-template. The La2O3-KIT-6 support exhibited a high specific surface area and well-formed mesoporous structure, leading to a highly dispersed Ni active sites and enlarged interfaces between La2O2CO3 and Ni. This facilitated the reaction between coke and La2O2CO3 species, keeping the Ni sites more clean and active.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Sol Ahn, Patrick Littlewood, Yiqi Liu, Tobin J. Marks, Peter C. Stair
Summary: Deposition of La2O3 and Al2O3 on alumina-supported nickel catalyst can stabilize the catalytic activity and eliminate the induction period in the dry reforming of methane reaction.
Article
Chemistry, Multidisciplinary
Qi Song, Rui Ran, Xiaodong Wu, Zhichun Si, Duan Weng
Summary: Dry reforming of methane is an efficient way to utilize carbon dioxide. This study utilized mesoporous silica support SBA-15 and microporous silica support beta as catalyst supports, and obtained highly dispersed Ni nanoparticles on Ni-SBA-15 and Ni-beta catalysts prepared by ammonia evaporation method. The Ni-SBA-15 and Ni-beta catalysts showed excellent catalytic activity, with a CO2 conversion of ca. 89 % and a CH4 conversion of ca. 84 % at 700 degrees C and nearly 100 % conversions at 800 degrees C. The mesopores of SBA-15 provided confinement for Ni nanoparticles, preventing Ni sintering and carbon deposition. However, the smaller pore size of beta hindered the introduction of Ni into its micropores, leading to more intensive Ni sintering and carbon deposition.
JOURNAL OF CO2 UTILIZATION
(2023)
Review
Chemistry, Physical
Bernard Chukwuemeka Ekeoma, Mohammad Yusuf, Khairiraihanna Johari, Bawadi Abdullah
Summary: Dry reforming of methane (DRM) is a green alternative for utilizing greenhouse gases and producing syngas. The main limitations of DRM are catalyst sintering and coking. Recent studies have focused on Ni-based catalysts for DRM due to economic constraints on noble metal-based catalysts. Mesoporous silica (MS) supported catalysts show promise due to their high surface areas, thermal stability, and easy availability. However, research on MS as a catalyst support for DRM is still limited.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
John Tamunosaki Iminabo, Misel Iminabo, Alex C. K. Yip, Shusheng Pang
Summary: This study investigates the production of hydrogen-rich syngas from renewable sources using durable and efficient catalysts. The results show that the 20%Ni-20%Fe-10%Co/ZSM-5 trimetallic catalyst performs the best in the steam methane reforming of simulated producer gas, effectively inhibiting carbon formation and sintering.
Article
Chemistry, Physical
Zijian Chen, Lei Mao, Xiuzhong Fang, Xianglan Xu, Junwei Xu, Xiang Wang
Summary: Ce, Zr, and Al were used as promoters for Y2O3 supports to improve the efficiency of Ni/NiO catalysts in DRM reaction. XRD and Raman results confirmed that the three cations were doped into the lattice of Y2O3, resulting in supports with lower crystallinity and higher surface areas. As a result, all the modified catalysts exhibited significantly improved reaction performance. The interaction between Ni and the modified catalysts was enhanced, leading to improved Ni dispersion. Furthermore, the modified catalysts showed enhanced alkalinity, which facilitated CO2 activation and increased activity. Surface active oxygen species were also found to be more abundant in the modified catalysts, which played a critical role in eliminating carbon depositions. The enhanced DRM performance of the modified catalysts was believed to be attributed to the interaction of these factors. In situ DRIFTS results confirmed that the addition of secondary metals accelerated the conversion of formate intermediate species, thereby improving the DRM activity of the catalyst.
Article
Chemistry, Physical
Anis Hamza Fakeeha, Rutu Patel, Nissrine El Hassan, Salma A. Al-Zahrani, Abdulrhman S. Al-Awadi, Leone Frusteri, Hossein Bayahia, Abdulrahman I. Alharth, Ahmed Sadeq Al-Fatesh, Rawesh Kumar
Summary: In this study, a series of 5NixHo/YZr materials were tested and characterized. The results showed that the addition of yttria modified the pore sizes and stabilized cubic zirconia phases, while the addition of holmium brought stable cubic zirconia and a wide range of reducible species. The catalyst with 4 wt% holmium loading exhibited the best performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Anis H. H. Fakeeha, Yousef A. A. Al-Baqmaa, Ahmed A. A. Ibrahim, Fahad S. S. Almubaddel, Mohammed F. F. Alotibi, Abdulaziz Bentalib, Ahmed E. E. Abasaeed, Ateyah A. A. Al-Zahrani, Yahya Ahmed Mohammed, Ahmed S. S. Al-Fatesh
Summary: The dry reforming of methane is a popular procedure for transforming methane and carbon dioxide into useful syngases. This study investigated a series of Ni-based catalysts supported by zirconia alumina and found that the 5Ni + 3Fe-10Zr + Al catalyst had the best catalytic activity with high conversions of methane and carbon dioxide, as well as a desirable H-2/CO ratio of 0.98.
Article
Chemistry, Applied
Aaron J. Najfach, Catherine B. Almquist, Richard E. Edelmann
Summary: In this study, the effects of manganese on zeolite-supported nickel catalysts in dry reforming of methane were investigated. It was found that the impact of manganese on catalyst activity depends on the type of zeolite support. Generally, manganese decreased the activity of the catalysts, but improved stability over a 24-hour reaction period.
Article
Chemistry, Applied
Yikyeom Kim, Hyun Suk Lim, Minbeom Lee, Jae W. Lee
Summary: The study achieved complete methane conversion using abundant metal oxide particles by utilizing deposited surface carbon as a reaction intermediate. Incorporating Ni into the Fe-Al oxide overcame agglomeration and performance decline issues, while also improving CH4 activation and carbon gasification kinetics.
Article
Engineering, Chemical
Nasim Ghorbani, Gholamreza Moradi
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2019)
Article
Green & Sustainable Science & Technology
Gholamreza Moradi, Tanaz Ghanadi
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2019)
Article
Energy & Fuels
Raziye Rezaei, Gholamreza Moradi, Shahram Sharifnia
Article
Engineering, Chemical
Shokoufe Hosseini, G. R. Moradi, Kiumars Bahrami
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2019)
Article
Engineering, Chemical
Neda Hajizadeh, Gholamreza Moradi, Siavash Ashoori
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2020)
Article
Engineering, Environmental
Raheleh Talavari, Shokoufe Hosseini, G. R. Moradi
Summary: Renewable biofuels production helps alleviate concerns about the end of fossil fuels. Utilizing waste materials like travertine stone powder as a catalyst for biodiesel production demonstrates high efficiency and stability.
WASTE MANAGEMENT & RESEARCH
(2021)
Article
Chemistry, Physical
Fatemeh Bibak, Gholamreza Moradi
REACTION KINETICS MECHANISMS AND CATALYSIS
(2020)
Article
Polymer Science
Zahra Mohamadi, Gholamreza Moradi, Hamid Reza Teimoury
Summary: The study showed that different types of internal electron donors (IDs) have a significant impact on the morphology and activity of catalysts used for ethylene polymerization, with S-cat exhibiting the highest activity and P-cat showing the lowest activity.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Shokoufe Hosseini, Gholamreza Moradi, Kiumars Bahrami
Summary: The use of microchannel enhanced the production rate of methyl esters, with the optimum conditions determined through response surface methodology. By synthesizing ionic liquid using -M-1 microchannel, an average biodiesel yield of 98.85% was achieved under the best conditions.
Article
Engineering, Chemical
Pardis Arzanypour, Gholamreza Moradi, Pourya Reshadi
Summary: This study investigated the oxidative desulfurization of a simulated oil fraction containing 1000 ppm dibenzothiophene using cobalt supported on natural zeolite as the catalyst. The performance of the catalyst under different operating conditions was evaluated using response surface methodology. The optimum conditions for desulfurization were determined and the catalyst exhibited high desulfurization capability even after consecutive recycling. Furthermore, the catalyst was also evaluated for real oil fractions with high sulfur content, achieving significant sulfur removal without affecting the fuel properties.
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2023)
Article
Engineering, Chemical
Seied Reza Yahyavi, Gholamreza Moradi
Summary: The deactivation of nickel catalysts in the dry reforming of methane process has been a concern for researchers. This study investigates the efficiency of synthesized Ni-Co/Al2O3-MgO nanocatalysts with different active phase and support promoter uses in a wall coated microreactor. The use of ultrasound waves in catalyst synthesis improves surface morphology and increases specific surface area and pore volume. Promoters enhance catalyst activity and stability, while the wall-coated microreactor improves heat transfer and access to active sites.
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2023)
Article
Chemistry, Inorganic & Nuclear
Zahra Mohammadi, Gholamreza Moradi, Hamidreza Teimoury
Summary: Catalysts for ethylene polymerization were prepared using a solution-based precursor incorporating magnesium ethoxide-titanium tetra butoxide. A new chlorinating agent, ethyl aluminum sesquichloride (EASC), was used for catalyst precipitation. The resulting catalysts were evaluated through various analytical techniques and characterized by FTIR, FE-SEM, BET, particle size analysis, and elemental analysis. Higher chlorination temperatures and increased EASC/Mg molar ratios led to catalysts with smaller particle size, narrower particle size distribution, increased surface area, and improved activity.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Mohamad jafar Moradi, Gholamreza Moradi, Amir Heydarinasab, Alimorad Rashidi
Summary: This study investigated the catalytic performance of Ni-Co/Al2O3-ZrO2 thin films prepared by physical vapor deposition (PVD) method in the dry reforming of methane (DRM). The optimized catalyst showed good conversion rate and stability.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Neda Hajizadeh, Gholamreza Moradi, Siavash Ashoori
Summary: The study developed a thermodynamic model for asphaltene precipitation and deposition by using different equations of state (EOS) and combining rules, which was validated through experiments on live oil samples. The results showed that the van Laar combining rule in conjunction with the modified-SRK-EOS accurately predicted asphaltene precipitation under various pressure and gas injection scenarios, with minimal deviation from experimental data.
Article
Engineering, Chemical
Rojiar Akbari Sene, G. R. Moradi, S. Sharifnia, Farhad Rahmani
DESALINATION AND WATER TREATMENT
(2020)
