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7. Optimizing barium promoter for nickel catalyst supported on yttria‐stabilized zirconia in dry reforming of methane

Author

Al‐Fatesh, Ahmed Sadeq, primary, Ibrahim, Ahmed Aidid, additional, Osman, Ahmed I., additional, Albaqi, Fahad, additional, Arasheed, Rasheed, additional, Francesco, Frusteri, additional, Serena, Todaro, additional, Anojaidi, Khalid, additional, Lanre, Mahmud Sofiu, additional, Abasaeed, Ahmed Elhag, additional, Fakeeha, Anis Hamza, additional, Bentalib, Abdulaziz, additional, and Bagabas, Abdulaziz, additional

Published
2023
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9. Fe-Promoted Alumina-Supported Ni Catalyst Stabilized by Zirconia for Methane Dry Reforming.

Author

Fakeeha, Anis H., Al-Baqmaa, Yousef A., Ibrahim, Ahmed A., Almubaddel, Fahad S., Alotibi, Mohammed F., Bentalib, Abdulaziz, Abasaeed, Ahmed E., Al-Zahrani, Ateyah A., Mohammed, Yahya Ahmed, and Al-Fatesh, Ahmed S.

Subjects
CHEMICAL processes, CATALYSTS, CATALYST supports, CATALYTIC activity, CARBON dioxide
Abstract

The dry reforming of methane is a highly popular procedure since it can transform two of the most abundant greenhouse gases, methane and carbon dioxide, into useful syngases that can be further processed into valuable chemicals. To successfully achieve this conversion for the effective production of syngas, an optimal catalyst with advantageous physicochemical features must be developed. In this study, a variety of Ni-based catalysts supported by zirconia alumina (5Ni-10Zr + Al) were prepared by using the impregnation approach. Different loadings of Fe promoter were used, and the performances of the resulting catalysts in terms of activity and stability were investigated. The catalyst used in this study had an active metal component made of 5% Ni and x% Fe supported on 10ZrO2 + Al2O3, where x = (1, 2, 3, and 4). The physicochemical characteristics of both freshly calcined and used catalysts were studied using a range of characterization techniques, such as: N2 adsorption–desorption isotherms, XRD, H2-TPR, Raman spectroscopy, TGA, and TEM. An investigation of the effects of the Fe promoter on the catalytic activity of the catalyst (5Ni + xFe-10Zr + Al) was conducted. Amongst the studied catalysts, the 5Ni + 3Fe-10Zr + Al catalyst showed the best catalytic activity with CH4 and CO2 conversions of 87% and 90%, respectively, and had an H2/CO ratio of 0.98. [ABSTRACT FROM AUTHOR]

Published
2023
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18. Oscillation of Work Function during Reducible Metal Oxide Catalysis and Correlation with the Activity Property.

Author

Pan, Yanbo, Shen, Xiaochen, Holly, Michael A., Yao, Libo, Wu, Dezhen, Bentalib, Abdulaziz, Yang, Jinlong, Zeng, Jie, and Peng, Zhenmeng

Subjects
ELECTRON work function, CATALYTIC activity, METALLIC oxides, OSCILLATIONS, ACTIVATION energy
Abstract

Deducing from the fact that RMO catalysis typically involves reversible valence states transformation of active sites, we report one new model that uses RMO work function and its oscillation as descriptors to depict the activity property. Our experiments and DFT simulations of CO oxidation model reaction lead to an inverted volcano correlation between the two descriptors and the activity energy barrier, which shows good consistence with this new model and thus validates its effectiveness. The findings of work function and the oscillation as governing structural parameters provide a plausible theory to understand RMO catalysis and guide the catalyst research. [ABSTRACT FROM AUTHOR]

Published
2020
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20. Energy Efficient Water Desalination Based on Faradic Reactions

Author

Bentalib, Abdulaziz

Subjects
Chemical Engineering, Faradic Reactions, Water Desalination, Capacitive Deionization, Energy Efficient, pseudocapacitive
Abstract

Freshwater shortage has become an essential issue within the past decades due to the increasing world population, expansion of industries and agriculture, which might greatly threaten over common fraction of the world population. Researchers have developed an efficient technique to desalinate the saltwater (brackish or seawater) to meet the increasing demand of fresh water. Until now, different technologies such as thermal distillation, including multi-stage flash (MSF) and multieffect distillation (MED) , reverse osmosis membrane desalination (RO) have been utilized. Nevertheless, these technologies required an excessive amount of energy. Capacitive deionization was raised as an excellent alternative for water desalination due to low energy input needed and environmentally friendliness. However, it still suffers from the low salt adsorption capacity. Here in this dissertation, I focus in finding a Faradic capacitive electrode that will enhance the salt adsorption capacity through the chemical reactions between the electrodes and the NaCl ions. The electrodes should have a high theoretical capacity, low cost, and be environmentally friendly. By using the amorphous iron phosphate in a hybrid capacitive deionization cell, I was able to enhance the salt adsorption capacity to more than threefold of the conventional capacitive deionization. Nevertheless, the limitation performance from the anodic electrodes was an obstacle in improving the desalination capacity by the hybrid capacitive deionization to the level to compete with the traditional reverse osmosis. Therefore, we synthesized silver mercury alloy which possess a theoretical high capacity to address that issue by reacting with the chloride ions. Peering the silver mercury alloy with the amorphous iron phosphate enabled the faradic capacitive cell to reach a significant high salt adsorption capacity.I also focused my study to find an optimum cell design that will enhance the salt adsorption capacity, limit the ion diffusion issues, and promote a continuous and fast adsorption process with an energy-efficient water-salt separation. Through designing a new cell that consist of two chambers, I was able to find a way to continuously desalinate water without the need of discharging step. Moreover, by the synthesis of a 30 nm size silver and silver mercury, I was able to enhance the salt adsorption capacity to a remarkable level.

Published
2020

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