Hamdy Farag

Mansoura University

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Kinya Sakanishi

National Institute of Advanced Industrial Science and Technology

Isao Mochida

Kyushu University

Masahiro Kishida

Kyushu University

D.D. Whitehurst

Kyushu University

Ikuo Saito

National Institute of Advanced Industrial Science and Technology

Akimitsu Matsumura

National Institute of Advanced Industrial Science and Technology

Yoshikazu Sugimoto

Institute of Livestock and Grassland Science

Mohamed Mahmoud Nasef

University of Technology Malaysia

Masato Kouzu

Tokyo City University

Hamid A. Al‐Megren

King Abdulaziz City for Science and Technology

Cooperative Institutions

University of Technology Malaysia

National Institute of Advanced Industrial Science and Technology

Kyushu University

The Institute of Energy Economics, Japan

Japan Science and Technology Agency

Universiti Teknologi MARA

University of Kuala Lumpur

National Institute for Materials Science

Nitto Chemical Industry (Japan)

Kobe University

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Assessment of limitations and potentials for improvement in deep desulfurization through detailed kinetic analysis of mechanistic pathways

Catalysis Today (1998)

D.D. Whitehurst Hamdy Farag Takashi Nagamatsu Kinya Sakanishi Isao Mochida

Carbon fibers

10.1016/s0920-5861(98)00234-x

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Citations (57)

Highly Active Low Cobalt Content-Based Bulk MoS₂ Hydrodesulfurization Catalysts with a Unique Impact of H₂S

Journal of Chemistry (2018)

Hamdy Farag Abd-Alrahman Embaby Masahiro Kishida Abdel-Nasser A. El-Hendawy Mohamed Mahmoud Nasef

A series of unsupported MoS 2 , Co 9 S 8 , and Co-promoted MoS 2 catalysts have been synthesized by tuned impregnation and successive thermal annealing methods using a continuous flow of a mixture of H 2 and H 2 S gases. The resulting catalysts were evaluated in terms of their activity and selectivity for the hydrodesulfurization of dibenzothiophene (DBT) both in the absence and the presence of H 2 S. The inclusion of Co onto MoS 2 affected both the hydrogenation and direct desulfurization reactions, with the latter (production of biphenyl) being magnified to a much greater degree than the former. Interestingly, low cobalt/molybdenum ratio of ca. 0.05 of the catalyst exhibited outstanding promotion efficiency in the hydrodesulfurization reaction. However, as cobalt is added, the synergy effect drastically decreased. H 2 S in the reaction mixture led to a remarkable step up in the product from the direct desulfurization reaction route with the most notable increases occurring for the product from the hydrogenation reaction pathway. The HDS activity of such catalysts was much higher than that of the commercial CoMo/Al 2 O 3 . The promotion by H 2 S was discussed.

Dibenzothiophene

10.1155/2018/8076534

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Citations (2)

Kinetic Analyses and Inhibition by Naphthalene and H₂S in Hydrodesulfurization of 4,6-Dimethyldibenzothiophene (4,6-DMDBT) over CoMo-Based Carbon Catalyst

Energy & Fuels (1998)

Hamdy Farag Kinya Sakanishi Isao Mochida D.D. Whitehurst

Hydrodesulfurization of 4,6-dimethyldibenzothiophene (4,6-DMDBT) in decane has been investigated over a Co−Mo/C catalyst, using a magnetically stirred autoclave reactor. The hydrodesulfurization reaction was found to be pseudo-first order with respect to 4,6- DMDBT. Direct desulfurization was detected to be Arrhenius-dependent with an activation energy of 35.7 kcal/mol, while hydrogenation pathway showed a maxima at 340 °C. The activation energy of hydrogenation in the Arrhenius-dependent region was calculated to be 17.9 kcal/mol, as hydrogenation is thermodynamically limited at high temperature. The reaction of hydrodesulfurization appears to proceed via two different partially dependent routes, hydrogenation and desulfurization, over the present catalyst. Hydrogenation of 3,3'-dimethylbiphenyl at different temperatures was also measured to identify the rates of the step involved in the hydrodesulfurization network of 4,6-DMDBT. Attention was particularly paid to the effects of naphthalene and H2S on the two different reaction pathways to propose the mechanism of their inhibition. Two different catalytic active sites, one for hydrogenation and the other for both hydrogenation and direct desulfurization, are discussed to be present.

Dibenzothiophene

Decane

10.1021/ef980141a

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Citations (44)

Preparation of alkaline polymer catalyst by radiation induced grafting for transesterification of triacetin under neural network optimized conditions

Journal of Macromolecular Science Part A (2016)

Mohamed Mahmoud Nasef Seyedeh Sara Alinezhad Ramli Mat Parvaneh Shabanzadeh Rubiyah Yusof

A simple and flexible method was used to develop new alkaline polymer catalyst through radiation induced grafting of glycidylmethacrylate (GMA) onto polyethylene/polypropylene (PE/PP) nonwoven sheet followed by amination reaction and alkalisation. The chemical structure and morphology of catalyst was evaluated by Fourier transform-infrared (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermal gravimetric analyzer (TGA). The catalyst was examined for the transesterification of triacetin/methanol mixtures in a batch mode and the obtained methyl ester was detected by GC-MS. In order to optimize the reaction parameters towards getting the higher yield, an artificial neural network (ANN) was used to develop a non-linear model correlating the four independent reaction parameters including catalyst dosage, triacetin/methanol molar ratio, reaction time and temperature. The maximum conversion obtained via the simulated annealing (SA) algorithm was 86.2% at the optimal conditions of 5.01 wt% catalyst dosage, triacetin/methanol 1:12 molar ratio, 8 h reaction time and 62.8°C temperature. Upon using these optimal conditions in the experimental reaction, the conversion of as high as 85% was achieved. These results suggest that the simply modified low cost PE/PP fibrous sheet has a potential to catalyze biodiesel production. Moreover, the combined ANN-SA modelling method is highly effective in predicting the conversion of transesterification reaction and optimizing its parameters.

Triacetin

Thermogravimetric analysis

10.1080/10601325.2016.1201751

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Citations (9)

A comparative assessment of the effect of H2S on hydrodesulfurization of dibenzothiophene over nanosize MoS2- and CoMo-based Al2O3 catalysts

Applied Catalysis A General (2007)

Hamdy Farag

Dibenzothiophene

10.1016/j.apcata.2007.07.025

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Citations (18)

Catalytic activity of synthesized nanosized molybdenum disulfide for the hydrodesulfurization of dibenzothiophene: Effect of H2S partial pressure

Applied Catalysis B Environment and Energy (2009)

Hamdy Farag Abdel-Nasser A. El-Hendawy Kinya Sakanishi Masahiro Kishida Isao Mochida

Dibenzothiophene

Molybdenum disulfide

10.1016/j.apcatb.2009.05.023

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Citations (41)

Synthesis of Active Hydrodesulfurization Carbon-Supported Co−Mo Catalysts. Relationships between Preparation Methods and Activity/Selectivity

Industrial & Engineering Chemistry Research (1998)

Hamdy Farag D.D. Whitehurst Isao Mochida

Several series of Co−Mo-based carbon catalysts series were synthesized using three methods, successive impregnation, successive impregnation with sulfidation in between, and equilibrium adsorption methods. Co/C and Mo/C were also prepared by impregnation. The activities of sulfided catalysts for hydrodesulfurization of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) as models of the most refractory sulfur-containing compounds found in petroleum oil were studied using an autoclave reactor operating at 2.9 MPa hydrogen pressure. The activity results were found to be highly dependent on the method of preparation. The series that was prepared by impregnation but with the sulfidation step before the cobalt addition exhibited superior activities for hydrodesulfurization (HDS) of DBT and 4,6-DMDBT. The activity results were compared with that of the conventional commercial Co−Mo/Al2O3 catalyst. Co−Mo/C catalysts had about twice the activity of the commercial catalyst. It was found that the activity of HDS depends on the metal loading as well as the order of metal addition during preparation. The highest synergetic effect between Co and Mo for HDS activity was observed at a Co/Mo atomic ratio of 0.325.

Dibenzothiophene

Sulfidation

Autoclave

Carbon fibers

10.1021/ie980077k

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Citations (64)

H2S and Aromatic Effects on Hydrodesulfurization of Dibenzothiophenes over C0M0/C Catalyst

CRC Press eBooks (2020)

Hamdy Farag Isao Mochida Kinya Sakanishi

Two most important groups of inhibitors in hydrodesulfurization (HDS) are aromatic hydrocarbons and H2S. Some studies have reported that H2S inhibited HDS of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). This chapter investigates the kinetics of HDS of DBT and 4,6-DMDBT over the laboratory prepared sulfided cobalt molybdenum supported on active carbon catalyst (Co-Mo/C). It presents detailed kinetic analysis of inhibition of HDS by naphthalene, as an aromatic inhibitor, and H2S for respective reactions to suggest natures of active sites on the catalyst in the presence or absence of H2S and aromatic components. Co-Mo/C catalyst was prepared by impregnation by a two step procedure in which the molybdenum phase was introduced first followed by drying in vacuum at 120°C overnight. The next step is the addition of cobalt phase to this precursor, followed by the same treatment as that used for molybdenum. The reactor used for catalytic activity measurements was a laboratory made 100cm magnetically stirred micro-autoclave.

10.1201/9781003075455-6

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Citations (2)

ADSORPTIVE REMOVAL OF SULFUR COMPOUNDS FROM NAPHTHA FRACTIONS BY USING CARBON ADSORBENTS

Kinya Sakanishi Hamdy Farag Shinya Sato Akimitsu Matsumura Ikuo Saito

Ultra-deep desulfurization of gasoline and diesel fuels is aimed to produce sulfur-free fuels or their sulfur contents below 10 ppm for the environmental protection in urban areas. To develop fuel cell vehicles in the future, olefin and aromatic compounds as well as sulfur compounds are to be removed to extremely low levels of less than percent levels of the former two compounds and tens of ppb levels of sulfur compounds. Hydrodesulfurization(HDS) of gasoline and diesel fuels has been widely applied in petroleum refineries for the production of such sulfur-free fuels, however, reduction of sulfur levels below 10 ppm is hardly achieved by conventional catalysts under HDS process conditions. Much higher activity and selectivity of HDS catalysts should be designed for the removal of refractory sulfur compounds in petroleum light products. Adsorptive removal processes of sulfur compounds from petroleum distillates have been also developing for the complete capture to achieve the sulfur levels below ppm order. Some of such adsorptive sulfur removal procedures are expected to produce sulfurfree gasoline and diesel fuels because of their simple and energysaving manner without hydrogen consumption. Although variable kinds of adsorbents have been screened for the achievement of sulfurfree fuel production, effects of coexisting aromatic compounds on the adsorption selectivity of sulfur compounds are not fully elucidated. Carbon adsorbents such as active carbon and active carbon fiber are one of the most promising materials for the selective removal of sulfur compounds at relatively low temperatures around room temperatures due to their extremely high surface area and very uniform pore size distribution with weak polarity. In the present study, some of mesoporous carbon adsorbents are investigated to estimate their adsorption capacity and selectivity for sulfur compounds such as benzothiophene(BT) and 2-methyl-benzothiophene(2MBT) and in their mixture with some aromatic compounds as model feedstocks. In addition, a real naphtha fraction is also treated with active carbons of different surface areas and particle sizes with or without dilution with n-hexane solvent. Mesoporous active carbons of finer particles are revealed to be preferable for the selective adsorption of two-ring sulfur compounds such as BT and 2MBT.

Naphtha

Fuel oil

Ultra-low-sulfur diesel

Petroleum product

Carbon fibers

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Citations (7)

Catalytic potential of carbon-supported NiMo-sulfide for ultra-deep hydrodesulfurization of diesel fuel

Applied Catalysis A General (2004)

Masato Kouzu Yasunori Kuriki Hamdy Farag Kinya Sakanishi Yoshikazu Sugimoto

Carbon fibers