Competitive reactions in alkyne hydrogenation

Hamilton, Christine A.; Jackson, S. David; Kelly, Gordon; Spence, Ron; Bruin, David de

doi:10.1016/s0926-860x(02)00332-0

Cited by 55 publications

(39 citation statements)

References 25 publications

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“…A previous study by Toppinen et al [15] gave different results in that no increase in rate was observed but the general behaviour was similar. This enhanced rate behaviour is unusual but has been observed before in the competitive reaction of pentynes [22] and pentenes [23]. In both cases it was suggested that each species had a unique adsorption site that the other reactant could not influence and that the hydrogen flux could potentially be increased by enhanced hydrogen transfer from a hydrocarbonaceous deposit.…”

supporting

confidence: 63%

Hydrogenation of alkylaromatics over Rh/silica

Alshehri

Weinert

Jackson

2017

Reac Kinet Mech Cat

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The hydrogenation, and competitive hydrogenation, of toluene, ethylbenzene, propylbenzene and the xylenes has been studied over a rhodium catalyst in the liquid phase at 323 K and 3 barg. The reactivity of the aromatics gave an order of para-xylene > ortho-xylene > metaxylene > toluene > ethylbenzene >> propylbenzene. Kinetic analysis revealed that the order of reaction in hydrogen was typically first order while the reaction order in toluene was zero order and negative half order for ethylbenzene. The reaction order for propylbenzene and the xylenes was negative first order. Apparent activation energies were calculated and all were in the range 26-46 kJ.mol -1 . Competitive hydrogenation between toluene, ethylbenzene and propylbenzene revealed that the propylbenzene was the most strongly adsorbed aromatic in agreement with the strongly negative reaction order. The xylenes gave an order of reactivity of para > ortho > meta following the increasing negative reaction order. Reactions with deuterium revealed an inverse kinetic isotope effect, most likely related to the change in hybridization of the carbon from sp 2 to sp 3 , for all reactions, except that of ortho-xylene.

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supporting

confidence: 63%

Hydrogenation of alkylaromatics over Rh/silica

Alshehri

Weinert

Jackson

2017

Reac Kinet Mech Cat

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“…2(c)). [22][23][24][25] Even if the latter step is rate determining, the apparent E a probably depends on the H 2 dissociation, because enhancement of the dissociation provides Inset is a magni cation of x ≤ 0.8. The rate for x = 0 was assumed to be 0 by measurement using commercial Fe powder.…”

Section: Discussionmentioning

confidence: 99%

Hydrogenation of Propyne Verifying the Harmony in Surface and Bulk Compositions for Fe-Ni Alloy Nanoparticles

et al. 2017

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“…Although alkene hydrogenation is inhibited by the presence of alkynes, in the absence of the alkyne research indicates that the alkene will react more rapidly [34]. Research has also shown that in a competitive environment the alkyne can influence the reactivity of other alkynes and alkenes [35,36]. However, all of these studies have been performed at low temperatures (typically \100°C), whereas in transhydrogenation the reaction will take place at moderate to high temperatures ([400°C).…”

Section: Dehydrogenation and Hydrogenation Processes In Trans-hydrogementioning

confidence: 99%

Catalytic upgrading of refinery cracked products by trans-hydrogenation: a review

Garba

Jackson

2016

Appl Petrochem Res

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The production of high premium fuel is an issue of priority to every refinery. The trans-hydrogenation process is devised to convert two low valued refinery cracked products to premium products; the conversion processes involve the combination of dehydrogenation and hydrogenation reaction as a single step process. The paper reviews the recent literature on the use of catalysts to convert low value refinery products (i.e. alkanes and alkynes or alkadienes) to alkenes (olefins) by trans-hydrogenation. Catalysts based on VO x , CrO x and Pt all supported on alumina have been used for the process. However, further studies are still required to ascertain the actual reaction mechanism, mitigating carbon deposition and catalyst deactivation, and the role of different catalysts to optimize the reaction desired products.

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Competitive reactions in alkyne hydrogenation

Cited by 55 publications

References 25 publications

Hydrogenation of alkylaromatics over Rh/silica

Hydrogenation of alkylaromatics over Rh/silica

Hydrogenation of Propyne Verifying the Harmony in Surface and Bulk Compositions for Fe-Ni Alloy Nanoparticles

Catalytic upgrading of refinery cracked products by trans-hydrogenation: a review

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