Synthesis of molybdenum cobalt nanocatalysts supported on carbon for hydrodesulfurization of liquid fuels

Saleh, Tawfik A.; AL-Hammadi, Saddam A.; Abdullahi, Ibrahim Munkaila; Mustaqeem, Mujahid

doi:10.1016/j.molliq.2018.09.118

Cited by 61 publications

(13 citation statements)

References 54 publications

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“…Although the process would bring forth low-grade products, which include benzene and toluene, as well as small chain alkanes, it is very important to undergo further refining. Generally, the catalytic cracking process usually produces a low carbon yield due to its high formation of coke that leads to a reduced short lifetime of the catalyst [90,91].…”

Section: Classification Of Deoxygenation Catalystsmentioning

confidence: 99%

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Opportunities and Challenges of High-Pressure Fast Pyrolysis of Biomass: A Review

et al. 2021

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Most pyrolysis reactors require small sizes of biomass particles to achieve high-quality products. Moreover, understanding the usefulness of high-pressure systems in pyrolysis is important, given the operational challenges they exhibit specific to various biomass materials. To actualize these aspects, the authors first checked previous reviews involving pyrolysis on different biomass and different conditions/situations with their respective objectives and subsections. From these already existing reviews, the team found that there has not been much emphasis on high-pressure fast pyrolysis and its potential in biomass conversion, showing that it is a novel direction in the pyrolysis technology development. Therefore, this review aims to shed more light on high-pressure fast pyrolysis, drawing from (a) classification of pyrolysis; (b) reactors used in fast pyrolysis; (c) heat transfer in pyrolysis feedstock; (d) fast pyrolysis parameters; (e) properties/yields of fast pyrolysis products; (f) high pressure on pyrolysis process; (g) catalyst types and their application; and (h) problems to overcome in the pyrolysis process. This review increases the understanding regarding high-pressure fast pyrolysis. An attempt has been made to demonstrate how high-pressure fast pyrolysis can bring about high-quality biomass conversion into new products. It has been shown that fluidized bed (bubbling and circulating) reactors are most suitable and profitable in terms of product yield. The high-pressure, especially combined with the fast-heating rate, may be more efficient and beneficial than working under ambient pressure. However, the challenges of pyrolysis on a technical scale appear to be associated with obtaining high product quality and yield. The direction of future work should focus on the design of high-pressure process reactors and material types that might have greater biomass promise, as well understanding the impact of pyrolysis technology on the various output products, especially those with lower energy demands. We propose that the increase of process pressure and biomass particle size decrease should be considered as variables for optimization.

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Section: Classification Of Deoxygenation Catalystsmentioning

confidence: 99%

“…It is a hydrogenation process to eliminate contaminating molecules from the product in the range of 90%, such as nitrogen, sulfur, oxygen, and metals from bio-oil products to improve the qualities. This process is very widely used as the quality of the product is of very high grade [85,86,91].…”

Section: Classification Of Deoxygenation Catalystsmentioning

confidence: 99%

Opportunities and Challenges of High-Pressure Fast Pyrolysis of Biomass: A Review

et al. 2021

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“…In particular, the latter ones have been previously utilized as supports for active phases like metal oxide, metal or bimetallic nanoparticles, [39][40][41][42][43] as for example in the deposition of molybdenum cobalt nanocatalysts on a carbon support which led to 34% increment of dibenzothiophene hydrodesulfurization from a model oil, compared to pure MoCo. 44 Even though carbons are often used as catalyst supports, they can also be utilized as catalysts on their own, because of their physicochemical properties, such as the rich surface chemistry due to the presence of oxygen containing functional groups, the large micro/mesopore surface area, and their relatively stable structure and morphology at high temperatures and/or various liquid reaction media. [45][46][47] One of the most known reactions catalyzed by carbonaceous materials, the decomposition of hydrogen peroxide, is highly dependent on the nature of the surface functional groups.…”

Section: Introductionmentioning

confidence: 99%

Catalytic oxidative desulfurization of a 4,6-DMDBT containing model fuel by metal-free activated carbons: the key role of surface chemistry

et al. 2019

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“…On the other hand, environmental regulations necessitate limiting the amount of the sulfur component present in the fuel [8][9][10][11][12][13]. As a result, a decrease in sulfur content of re nery feedstock and fuel products is of environmental and industrial importance in the petroleum re ning industry [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Comparison of γ and δ-Al2O3 supported CoMo catalysts in the hydrodesulfurization of straight-run gas oil

2019

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The e ect of two di erent crystal species of alumina on the hydrodesulfurization activity of the corresponding CoMo catalysts was studied. Cylindrical extruded alumina with two di erent crystal structures, i.e., -Al2O3 and -Al2O3, was prepared using boehmite and nitric acid as a peptizing agent by calcination at 550 C and 900 C, respectively. Al2O3 supports were impregnated with 9 wt.% of Mo and 2 wt.% Co by an incipient wetness impregnation method. CoMo/Al 2 O 3 catalysts were used for hydrodesulfurization (HDS) and hydrodenitri cation (HDN) of Iranian Straight-Run Gas Oil (ISRGO). The supports and catalysts were characterized by nitrogen adsorptiondesorption isotherm, XRD, UV-vis-DRS, TPD, TPR, CO chemisorption, and ICP-OES. The HDS activity of CoMo/ -Al2O3 catalyst was higher than that of CoMo/ -Al2O3 and was found to be 95.74%. This result was obtained from the formation of larger CoMoO 4 and MoO 3 crystals in CoMo/ -Al 2 O 3 catalyst, thus reducing the active metal phase dispersion and the performance of the catalyst. The HDS activity of CoMo/ -Al2O3 catalyst was remarkable as the metal content of the catalyst was low. The HDN activity of CoMo/ -Al2O3 was also about 66%.

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Synthesis of molybdenum cobalt nanocatalysts supported on carbon for hydrodesulfurization of liquid fuels

Cited by 61 publications

References 54 publications

Opportunities and Challenges of High-Pressure Fast Pyrolysis of Biomass: A Review

Opportunities and Challenges of High-Pressure Fast Pyrolysis of Biomass: A Review

Catalytic oxidative desulfurization of a 4,6-DMDBT containing model fuel by metal-free activated carbons: the key role of surface chemistry

Comparison of γ and δ-Al2O3 supported CoMo catalysts in the hydrodesulfurization of straight-run gas oil

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