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Friday, July 24, 2020 | History

2 edition of Alkane hydrogenolysis on supported group VIII metals. found in the catalog.

Alkane hydrogenolysis on supported group VIII metals.

Rosiyah Yahya

Alkane hydrogenolysis on supported group VIII metals.

by Rosiyah Yahya

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Published by Brunel University in Uxbridge .
Written in English


Edition Notes

ContributionsBrunel University. Department of Chemistry.
The Physical Object
Pagination248p. :
Number of Pages248
ID Numbers
Open LibraryOL19718621M

Abstract. Hydrogenolysis of C–O bonds is becoming more and more important for the production of biomass-derived chemicals. Since substrates originated from biomass usually have high oxygen content and various kinds of C–O bonds, selective hydrogenolysis is required. Turnover frequencies for the hydrogenolysis of propane and of n-butane decrease with increasing dispersion for a series of Ru/Al 2 O 3 catalysts prepared from Ru(acac) 3, having values of H/Ru between and Activation energies for reactant removal do not vary greatly or systematically with dispersion, but product selectivities found with n-butane do.

  We have shown that fibrous nanosilica (KCC-1) can serve as a suitable support for the synthesis of highly dispersed ruthenium (Ru) nanoparticles. The resulting KCC-1/Ru catalyst displayed superior activity for the hydrogenolysis of propane and ethane at atmospheric pressure and at low temperature. The high catalytic activity was due to the formation of Ru . 8 A few reviews 9−15 and book chapters 16−18 discussed the isomerization of light naphtha in terms of catalysts, deactivation, reaction thermodynamics, kinetics, and process developments.

The kinetics of the hydrogenolysis of some light saturated hydrocarbons has been studied and the results have been rationalized by using a rate expression derived from the . Here, we report the work on self-supported hydrogenolysis (SSH) strategy for the transformation of C Ar ─O bonds in aromatic ethers to produce arene as the single product ().It was found that different aromatic ethers including lignin could be transformed into arenes over the highly efficient RuW alloy catalyst without any exogenous hydrogen or other reductant input, .


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Alkane hydrogenolysis on supported group VIII metals by Rosiyah Yahya Download PDF EPUB FB2

This chapter discusses the interaction of small metal particles with reducible oxide supports, and focuses on Group VIII (or Group ) metals supported on TiO strong suppression in catalytic activity and chemisorption capacity observed on TiO 2-supported catalysts after reduction at high temperatures can be, at least partially, explained by a geometric blocking of.

This chapter discusses the interaction of small metal particles with reducible oxide supports, and focuses on Group VIII (or Group ) metals supported on TiO strong suppression in catalytic activity and chemisorption capacity observed on TiO 2-supported catalysts after reduction at high temperatures can be, at least partially, explained by a Cited by:   The other mechanism is multiple hydrogenolysis over all the other Group VIII metals, Mo and Rh.

In contrast with Pt, Ni belonging to the second kind leads to successive α-scission of C C bond before the desorption of adsorbed species, thereby resulting in successive demethanation [57], [72].Cited by: 2. The effects of metal catalyst identity on the ethane hydrogenolysis rates and mechanism were examined using density functional theory (DFT) for Group 8–11 metals (Ru, Os, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au).

Previously measured turnover rates on Ru, Rh, and Ir clusters show H2-pressure dependence of [H2]–3, consistent with C–C bond activation in *CHCH* intermediates Cited by: 2. The behavior of alumina-supported palladium-platinum catalysts in the reaction of n-hexane hydrogenolysis was analyzed.

The monometallic Pt/Al2O3 catalyst showed much higher activity than the rest of catalysts. The relationship between the catalytic activity of Pd–Pt/Al2O3 catalysts and bulk Pd–Pt composition matched the accepted relation between Cited by: 1. Alkane hydrogenolysis on supported Group VIII metals.

Author: Yahya, Rosiyah. ISNI: Awarding Body: Brunel University Current Institution: Brunel University Date of Award: Availability of Full Text: Full text unavailable from EThOS. Purchase Catalytic Hydrogenation over Platinum Metals - 1st Edition. Print Book & E-Book.

ISBN  Hydrogenolysis of complex heteroatom-containing organic molecules plays a large role in upgrading fossil- and biomass-based fuel and chemical feedstocks, such as hydrodeoxygenation and desulfurization. Here, we present a fundamental study contrasting the cleavage of C–X bonds in ethane, methylamine, methanol, methanethiol, and chloromethane on group 8–11 transition metals.

Journals & Books; Help; COVID campus closures: see options for getting or retaining Remote Access to subscribed content Vol Issue 1, 15 JunePages Note. On the mechanism of alkane hydrogenolysis. Author links open overlay panel. metals (Pt (4), Ag (5)) had a tendency to spread on the reduced­-titania surface.

These interactions drastically suppressed acti­ vity for alkane hydrogenolysis (6,7); however, the same systems showed increased activity for CO-H 2 synthesis, often accompanied by improved selectivity to higher hydrocarbons.

times larger than C−O hydrogenolysis rates on single crystals of Pt,13 Pd,9−11 and Ni Density functional theory (DFT) treatments of the conversion pathways for ethanol,14−17 ethylene glycol,18 and glycerol19 on Group VIII metals (Pt, Pd, Ir, Ru, Rh) indicate that H-removal steps occur before C−Cor.

Effects of Catalyst Model and High Adsorbate Coverages in ab Initio Studies of Alkane Hydrogenolysis. ACS Catalysis8 (7), DOI: /acscatal.8b Experimental studies of gas-phase main-group metal clusters. Chemical The Influence of Particle Size on the Catalytic Properties of Supported Metals.

This paper reviews recent applications of well-defined silica-supported hydrides of the group 4 and 5 transition metals in the field of carbon—carbon and carbon—hydrogen bonds activation of alkanes. The synthesis and characterization of the zirconium hydride is presented. The pattern of catalytic activities of Group VIII noble metals is discussed in relation to that of the nonnoble metals of Group VIII, and points of contrast are emphasized.

View Show abstract. Other authors provided evidence for the synergy of metal species and acid sites in alkane aromatization.

7,15À17 It has been sug-gested that metal active sites. Distribution Features of Products of Long-Chain Alkane Hydrogenolysis over Unpromoted Cobalt Catalysts M.

Kulikova, O. Dement’eva, A. Kuz’min Pages OriginalPaper. Fibrous Nano-Silica Supported Ruthenium (KCC-1/Ru): A Sustainable Catalyst for the Hydrogenolysis of Alkanes with Good Catalytic Activity and Lifetime Article in ACS Catalysis 2(7)–   The transformation of alkanes remains a difficult challenge because of the relative inertness of the C−H and C−C bonds.

The rewards for asserting synthetic control over unfunctionalized, saturated hydrocarbons are considerable, however, because converting short alkanes into longer chain analogues is usually a value-adding process.

Alkane metathesis is. Using density functional calculations we studied the conversion of methylcyclopentane to its various ring-opening products, branched and unbranched hexanes, that is, 2-methylpentane and 3-methylpentane, as well as n-hexane.

We examined four metal catalysts, M = Pt, Rh, Ir, and Pd, using slab models of flat M() and stepped M(). Alkane hydrogenolysis ove r supported metal catalysts is of active as other metals in groups 8, 9, that expresses the existence of interrelated kinetic behavior within a group of rate.

The generic name for the group of aliphatic hydrocarbons Cn-H2n+2. They are denoted by the suffix -ane. (Grant & Hackh's Chemical Dictionary, 5th ed) | .Hydrogenation is a chemical reaction between molecular hydrogen (H 2) and another compound or element, usually in the presence of a catalyst such as nickel, palladium or process is commonly employed to reduce or saturate organic enation typically constitutes the addition of pairs of hydrogen atoms to a molecule, often an alkene.The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).

Together with hydrogen they constitute group 1, which lies in the s-block of the periodic alkali metals have their outermost electron in an s-orbital: this shared electron configuration results in their having very similar characteristic .