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Selectivity hydrogenation

In hydrogenation, it is often desirable to hydrogenate selectively, leaving some unsaturated bonds intact. A review of hydrogenation reactions is available (89). [Pg.416]

The A -double bond is readily hydrogenated selectively in the presence of a A -doiible bond. With other double bonds selectivity is not so easily achieved. ... [Pg.209]

Ergosterol (a triene) rapidly takes up 1 mole of hydrogen selectively to give 5a,6-dihydroergosterol, recrystallized from methanol-chloroform, mp 173-174°. [Pg.44]

GP 8[ [R 7] Rhodium catalysts generally show no pronoimced activation phase as given for other catalysts in other reactions [3]. In the first 4 h of operation, methane conversion and hydrogen selectivity increases by only a few percent. After this short and non-pronounced formation phase, no significant changes in activity were determined in the experimental runs for more than 200 h. [Pg.323]

Other poisons (modifiers) used to create such selective Pd catalysts may be metals 23 Zn, Cd, Zr, Ru, Au, Cu, Fe, Hg, Ag, Pb, Sb, and Sn or solvents (organic modifiers) 24 pyridine, quinoline, piperidine, aniline, diethylamine, other amines, chlorobenzene, and sulfur compounds. Hydroxides have also been used to increase the half-hydrogenation selectivity of Pd. [Pg.33]

The C=C double bond in enamides was hydrogenated selectively without the cleavage of the C-N bond. A mixture of the enamide, sodium carbonate, and 10% Pd/C in EtOH was stirred under 1-3 atm hydrogen pressure for 16— 48 hours (Scheme 4.86).335... [Pg.168]

When the membrane pore size is reduced further to molecular dimensions, gas species separation can occur by molecular sieving. To separate hydrogen selectively from the other syngas components (CO, C02, CH4, and H20), porous membranes need to be able to discriminate molecules in the 0.3-0.4 nm size with 0.1 nm or less in size difference. [Pg.308]

Prabhu, A.K. and S.T. Oyama, Highly hydrogen selective ceramic membranes Application to the transformation of greenhouse gases,. Membr. Sci, 176, 233-248, 2000. [Pg.322]

Another useful compound is the 1 2 telomer of malonate and butadiene, 137. The first example is the synthesis of pellitorine (138), a naturally occurring pesticide (126). The terminal double bond was hydrogenated selectively with RuCl2(PPh3)3 as a catalyst. Partial hydrolysis afforded the monoester, which was treated with PhSeSePh to displace one of the carboxyl group with phenylselenyl group. Oxidative removal of the phenylselenyl group afforded 2,4-decadienoate (139), which is converted to pellitorine (138) ... [Pg.187]

The presence of [RhH(TPPMS)3] causes substantial changes in the mechanism of hydrogenation, that most probably follows a conventional monohydride mechanism as shown in Scheme 1.1. This is also reflected in the rates and the hydrogenation selectivities [27]. [Pg.15]

In general, the rate of alkene hydrogenation is typically ordered as follows terminal>di-substituted>tri-substituted >tetra-substituted. In fact, this allows terminal or di-substituted olefins to be hydrogenated selectively in the presence of tri- or tetra-substituted ones. Additionally, the rate of hydrogenation of al-kynes is much slower than that of alkenes, although the cis-alkene intermediate... [Pg.147]

Hydrogenation of butadiene with K3Co(CN)5, which is known to hydrogenate selectively conjugated dienes [75], was possible with 100% conversion and selectivity and a TOF up to 72 h-1 in the ionic liquid [BMIM][BF4], but the catalyst was deactivated after the first run and the inactive complex (BMIM)3Co(CN)5 was formed [69]. [Pg.1396]

Addition of some sodium borate to increase the fructose —> mannitol hydrogenation selectivity due to fructose-borate complex formation [21, 22]. [Pg.282]


See other pages where Selectivity hydrogenation is mentioned: [Pg.422]    [Pg.369]    [Pg.489]    [Pg.354]    [Pg.218]    [Pg.222]    [Pg.222]    [Pg.423]    [Pg.250]    [Pg.354]    [Pg.71]    [Pg.74]    [Pg.36]    [Pg.258]    [Pg.102]    [Pg.30]    [Pg.366]    [Pg.47]    [Pg.302]    [Pg.308]    [Pg.309]    [Pg.311]    [Pg.311]    [Pg.311]    [Pg.312]    [Pg.264]    [Pg.16]    [Pg.102]    [Pg.117]    [Pg.48]    [Pg.199]    [Pg.199]    [Pg.307]    [Pg.141]    [Pg.110]    [Pg.201]    [Pg.248]   
See also in sourсe #XX -- [ Pg.1206 , Pg.1208 ]

See also in sourсe #XX -- [ Pg.422 , Pg.445 , Pg.446 , Pg.503 ]

See also in sourсe #XX -- [ Pg.53 ]




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1,5,9-Cyclododecatriene selective hydrogenation

A Selection of Cyclic Hydrogen-Bonding Patterns Formed in Nucleoside and Nucleotide Crystal Structures

A hydrogen-selective membrane reactor application natural gas steam reforming

A selective hydrogenation

Acetophenone, selective hydrogenation

Acetylene alcohols, selective hydrogenation

Acetylene, selective hydrogenation

Acetylenics Selective hydrogenation

Aldehydes unsaturated, selective hydrogenation

Alkenes selective hydrogenation

Alkynes selective hydrogenation

Biodiesel selective hydrogenation

Carbon-hydrogen bonds allylic, selective bromination

Case Study Selection Guidelines for the Separation and Recovery of Hydrogen in Refineries

Catalysis selective hydrogenation

Catalysts hydrogenation, selective

Catalytic hydrogenation selectivity

Chemical processing selective hydrogenation

Chemo-selective hydrogenation reaction

Cinnamaldehyde selective hydrogenation

Cis/trans-Selective reactions with hydrogen

Citral, selective hydrogenation

Cobalt, hydrogenation selective

Coking selective hydrogenation

Conjugated dienes cyclic, selective hydrogenation

Cracked distillates, selective hydrogenation

Crotonaldehyde, selective hydrogenation

Cyclohexanediones hydrogenation, selective

Cyclooctadiene, hydrogenation selective

Cyclopentadiene, hydrogenation selective

Dense hydrogen perm-selective membranes

Dicyclopentadiene, selective hydrogenation

Dinitroanilines, hydrogenation selective

Dinitrobenzenes, hydrogenation selective

Double bond, exocyclic, selective hydrogenation

Fatty oils, selective hydrogenation

Gold catalysts selective hydrogenation

Gold selective hydrogenation

Halonitrobenzenes hydrogenation, selective

Heterogenous catalysis selective hydrogenation

Hexene hydrogenation, shape selectivity

Hexyne, selective hydrogenation

Hydrocarbons hydrogen atom selectivity

Hydrogen Permeation in Selected Systems

Hydrogen atom selection rules

Hydrogen atom selection rules for

Hydrogen availability selective, conjugated dienes

Hydrogen bonding solvent selectivity effects

Hydrogen bonds facial selectivity

Hydrogen bonds selectivities

Hydrogen from selected rare earth

Hydrogen selected properties

Hydrogen selective transformations

Hydrogen selectivity

Hydrogen state-selected ions

Hydrogen sulfide removal selectivity

Hydrogen sulfide selective precipitation

Hydrogen sulfide selectivity factor

Hydrogen transfer selective reduction

Hydrogen-Selective Catalytic Reduction (H2-SCR)

Hydrogen-selective catalytic reduction

Hydrogen-selective membrane reactor

Hydrogen-selective membrane reactor application

Hydrogen-selective membrane reactor methane steam reforming

Hydrogen-selective membrane reactor modelling

Hydrogen-selective membrane reactor process

Hydrogen-selective membranes

Hydrogenation 2,3-anti selective

Hydrogenation I Selectivity

Hydrogenation carbonyl-selective

Hydrogenation catalytic performance, selectivity

Hydrogenation cyclohexanedione, selective

Hydrogenation norbornenes, selective

Hydrogenation oleic acid, selective

Hydrogenation pentadiene, selective

Hydrogenation regio-selective

Hydrogenation selective liquid-phase

Hydrogenation selective partial

Hydrogenation selective poisoning effects

Hydrogenation selectivity promoters

Hydrogenation shape selective

Hydrogenation, catalytic selective

Hydrogenation, catalytic, alkene selectivity

Hydrogenation, catalytic, alkene selectivity with

Hydrogenation, fats selective

Iridium hydrogenation, selective

Iron modifiers selective hydrogenation

Isomerization selective hydrogenation

Isoprene, hydrogenation, selective

Ketones from carbonylation unsaturated selective hydrogenation

Limonene, selective hydrogenation

Mathematical modelling hydrogen-selective membrane

Methanol hydrogenation, selectivity

Methyl oleate selective hydrogenation

Methylacetylene, selective hydrogenation

Microstructured catalysts selective hydrogenations

Modifiers hydrogenation, selective

Norbornene, selective hydrogenation

Olefins, selective hydrogenation

Osmium hydrogenation, selective

Palladium selective hydrogenation

Palladium-based Selective Membranes for Hydrogen Production

Palladium-based membranes hydrogen selective membrane

Phenanthrenes, hydrogenation selective

Platinum/zeolite hydrogenation, selective

Poly selective hydrogenation

Product selectivity hydrogen concentration effect

Propadiene, selective hydrogenation

Pyridine hydrogenation, selective

Pyrolysis gasoline selective hydrogenation

Quinolines, alkylation selective hydrogenation

Raney copper hydrogenation, selective

Ring hydrogenation selective

Ruthenium/zeolite hydrogenation, selective

Selection Rules and Intensities for the Hydrogen Atom

Selection Rules for Hydrogen Absorption

Selection rules for the hydrogen atom

Selective (De)Hydrogenations

Selective Hydrogenation for Fine Chemical Synthesis

Selective Hydrogenation in Biodiesel Production

Selective Hydrogenation of Acetophenone into Phenylethanol

Selective Hydrogenation of Acetylene Alcohols

Selective Hydrogenation of Acetylenes and Dienes

Selective Hydrogenation of C4 Stream

Selective Hydrogenation of Crotonaldehyde

Selective Hydrogenation of Isolated Double Bonds

Selective Hydrogenation of Nitrobenzene to Aniline in the Liquid Phase

Selective Hydrogenation of Pyrolysis Gasoline

Selective Hydrogenation of Unsaturated Aldehydes and Ketones

Selective Hydrogenation of Unsaturated Ketones

Selective Hydrogenation of a,-Unsaturated Aldehydes

Selective Hydrogenation of a,p-Unsaturated Aldehydes

Selective Hydrogenations in the Presence of Other Functional Groups

Selective Hydrogenations in the Presence of Other Unsaturated Functions

Selective Nitrobenzene Hydrogenations

Selective acetylene hydrogenation catalyst development

Selective acetylene hydrogenation ethylene loss

Selective acetylene hydrogenation operation

Selective acetylene hydrogenation production

Selective asymmetric hydrogenations over chiral

Selective diene hydrogenation

Selective hydrogen combustion

Selective hydrogen reduction

Selective hydrogenation

Selective hydrogenation

Selective hydrogenation First step

Selective hydrogenation Second step

Selective hydrogenation reactions

Selective hydrogenation synthesis

Selective hydrogenation with iridium black

Selective oxidation of carbon monoxide in hydrogen

Selectivity alkyne hydrogenation over palladium

Selectivity hydrogen chloride effect

Selectivity hydrogenation of carbon

Selectivity hydrogenation, competitive

Selectivity in hydrogenation

Selectivity of CO hydrogenation

Selectivity of hydrogenation

Selectivity phenol hydrogenation

Selectivity, hydrogenation over

Selectivity, in catalytic hydrogenation

Shape- and Size-Selective Hydrogenation of Alkenes on the Imprinted Rh Dimer Catalyst

Site Selectivity of Hydrogen in Metals and Alloys

Solvent selectivity hydrogen-bonding systems

Styrene hydrogenation, shape selectivity

The Origin of Selectivity in Alkyne Hydrogenation

The Selective Oxidation of Carbon Monoxide in Hydrogen

Unconjugated dienes, hydrogenation selective

Unsaturated ketones, hydrogenation selective

Unsaturated nitriles, hydrogenation selective

Unsaturated selective hydrogenation

Vinylacetylene, selective hydrogenation

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