On the chemical effects on catalysts in the direct liquefaction of coal

Charcosset, H.; Bacaud, R.; Бессон, М.; Jeunet, A.; Nickel, Bernhard; Oberson, M.

doi:10.1016/0378-3820(86)90076-7

Cited by 24 publications

(7 citation statements)

References 11 publications

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“…8,83,89,209 Catalysis in liquefaction accelerates the reactions of hydrogenation, cracking, hydrocracking and heteroatom removal. [209][210][211] Because coal contains a large variety of species and functionalities, representative intermediates should be well characterized at each step of liquefaction to clarify their adsorption and reactivity over the catalyst surface. Reactive species for hydrogenation can be radicals, olefins and aromatic rings of various sizes with alkyl substituents.…”

Section: Catalysis In Direct Coal Liquefactionmentioning

confidence: 99%

Clean liquid fuels from direct coal liquefaction: chemistry, catalysis, technological status and challenges

Vasireddy

Morreale

Cugini

et al. 2011

Energy Environ. Sci.

338

209

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Increased demand for liquid transportation fuels coupled with gradual depletion of oil reserves and volatile petroleum prices have recently renewed interest in coal-to-liquids (CTL) technologies. Large recoverable global coal reserves can provide liquid fuels and significantly reduce dependence on oil imports. Direct coal liquefaction (DCL) converts solid coal (H/C ratio z 0.8) to liquid fuels (H/C ratio z 2) by adding hydrogen at high temperature and pressures in the presence or absence of catalyst. This review provides a comprehensive literature survey of the coal structure, chemistry and catalysis involved in direct liquefaction of coal. This report also touches briefly on the historical development and current status of DCL technologies. Key issues, challenges involved in DCL process and directions for the future research are also addressed.

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Section: Catalysis In Direct Coal Liquefactionmentioning

confidence: 99%

Clean liquid fuels from direct coal liquefaction: chemistry, catalysis, technological status and challenges

Vasireddy

Morreale

Cugini

et al. 2011

Energy Environ. Sci.

338

209

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“…Various studies have been carried out especially in order to determine the effect of catalyst concentration and addition method on the oils yield and composition (Charcosset et al, 1986;Liu et al, 1996). In the experiments performed to determine the effect of catalyst concentration and the addition method on the oils yield and composition, Mo(CO) 6 were used as a catalyst and its concentration was set to 6% and 9%.…”

Section: The Effect Of the Catalyst Concentration And Addition Methodsmentioning

confidence: 99%

“…Widely used coal liquefaction methods can be divide into two categories: direct and indirect. In order to increase yield of oils (n-pentane solubles), direct catalytic liquefaction method was preferred (Charcosset et al, 1986;Hewu, 1986;Joseph, 1991). Various catalysts and different preparation methods have been used to increase the yield of oils (Artok et al, 1992;Brannan et al, 1996;Liu et al, 1996;Song et al, 2000;Watanabe et al, 1984).…”

mentioning

confidence: 99%

Effect of Coal Liquefaction Conditions on the Composition of the Product Oil

Karaca

2006

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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“…These reactions may lead to the formation of high molecular weight residues. Prevention of the recombination of thermally generated radicals by catalytic intervention has been recognized as an important factor in the upgrading of heavy petroleums and more recently in coal liquefaction. , In view of the importance of dispersed MoS 2 catalysts, investigation of the effect of coal on their activity is much needed. The investigation reported here uses a single model compound to measure both hydrogenation activity and acid-catalyzed isomerization activity as a function of coal addition.…”

Section: Introductionmentioning

confidence: 99%

Poisoning and Inhibition of Dispersed Liquefaction Catalyst Activity by Exposure to Coal

et al. 1997

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The activity of a dispersed MoS 2 catalyst prepared in situ from ammonium tetrathiomolybdate was measured in octacosane containing various amounts of Argonne Premium Illinois No. 6 coal using microautoclaves. Conversion of 1-ethylnaphthalene (1-ETN) was followed to measure the extent of hydrogenation and/or rearrangement to 2-ETN. The reactors were charged with 1200 psig of hydrogen at room temperature. After a small amount of coal was added, activity for the acid-catalyzed rearrangement was virtually extinguished. Hydrogenation activity was significantly reduced but not eliminated. The effect on hydrogenation activity was divided into two components. One component was assigned to poisoning and the other to competitive inhibition. The weight of coal required to complete the poisoning process was determined to be 6 times the weight of Mo in the catalyst. The activity that remains for hydrogenating 1-ETN after the poisoning process is complete suffered from competitive inhibition as more coal was added. The amounts of H 2 S or basic nitrogen compounds that might be released from the coal during liquefaction were determined to be insufficient to account for the extent of deactivation observed.

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On the chemical effects on catalysts in the direct liquefaction of coal

Cited by 24 publications

References 11 publications

Clean liquid fuels from direct coal liquefaction: chemistry, catalysis, technological status and challenges

Clean liquid fuels from direct coal liquefaction: chemistry, catalysis, technological status and challenges

Effect of Coal Liquefaction Conditions on the Composition of the Product Oil

Poisoning and Inhibition of Dispersed Liquefaction Catalyst Activity by Exposure to Coal

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