Model Ziegler-Type Hydrogenation Catalyst Precursors, [(1,5-COD)M(μ-O2C8H15)]2(M = Ir and Rh): Synthesis, Characterization, and Demonstration of Catalytic Activity En Route to Identifying the True Industrial Hydrogenation Catalysts

2009 ◽  
Vol 48 (3) ◽  
pp. 1114-1121 ◽  
Author(s):  
William M. Alley ◽  
Chase W. Girard ◽  
Saim Özkar ◽  
Richard G. Finke
Keyword(s):  
Catalytic Activity ◽  
Hydrogenation Catalyst ◽  
Hydrogenation Catalysts

RhNPs supported on N-functionalized mesoporous silica: effect on catalyst stabilization and catalytic activity

2021 ◽  
Author(s):  
Israel T. Pulido-Díaz ◽  
Alejandro Serrano-Maldonado ◽  
Carlos César López-Suárez ◽  
Pedro A. Méndez-Ocampo ◽  
Benjamín Portales-Martínez ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Functional Groups ◽  
Hydrogenation Catalysts ◽  
Functionalized Mesoporous Silica ◽  
Catalyst Stabilization ◽  
Shape And Size

RhNPs supported on mesoporous silica functionalized with nicotinamide groups provided active hydrogenation catalysts for several functional groups, wherein the shape and size of the RhNPs are maintained after catalysis.

The effect of preparation conditions of a platinum hydrogentaion catalyst on its activity and on the dispersity of platinum crystallites

1979 ◽  
Vol 44 (9) ◽  
pp. 2619-2623 ◽  
Author(s):  
Jiří Hanika ◽  
Karel Sporka ◽  
Vlastimil Růžička ◽  
Jaroslav Bauer
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Hydrogen Chloride ◽  
Active Carbon ◽  
Hydrogenation Catalyst ◽  
Chloroplatinic Acid ◽  
Metallic Platinum ◽  
Preparation Conditions

The paper deals with the preparation of a hydrogenation catalyst, 5% of platinum on active carbon. The support was saturated with aqueous chloroplatinic acid or platinum tetrachloride. After calcination in streaming nitrogen the catalyst was reduced with hydrogen. We studied the effects of temperatures of the calcination and the reduction on 1) the formation of hydrogen chloride in the course of calcination and the following reduction, 2) the dispersity of metallic platinum and 3) the catalytic activity for hydrogenation of 2-methyl-3-butene-2-ol and nitrobenzene in liquid phase. The catalytic activity was found to be proportional to the dispersity of platinum.

RaneyR Type Nickel Catalysts From Rsr Atomization Of Al-Ni Powders

1981 ◽  
Vol 8 ◽  
Author(s):  
C. S. Brooks ◽  
F. D. Lemkey ◽  
G. S. Golden
Keyword(s):  
Catalytic Activity ◽  
Nickel Alloys ◽  
Nickel Catalysts ◽  
Amine Group ◽  
Hydrogenation Catalysts ◽  
Carbon Bond ◽  
Precursor Phase ◽  
Specific Catalytic Activity ◽  
Liquid Slurry ◽  
Type Nickel

ABSTRACTThe synthesis and catalytic properties of hydrogenation catalysts of the RaneyR type derived from aluminum-nickel and aluminum-molybdenum-nickel RSR alloy powders have been evaluated. Two binary aluminum-nickel alloys, RSR 588, with 50 w/o Ni corresponding to currently available RaneyR commercial alloys, and RSR 587, with 28.5 w/o Ni corresponding to the proeutectic composition which produces exclusively Al3Ni as the precursor phase, were synthesized. One ternary, RSR 589, aluminum-molybdenum-nickel alloy with a nickel and molybdenum content to correspond to a commercial promoted RaneyR alloy was prepared.The hydrogenation catalytic activity for six organic compounds representing diverse functionalities was measured in a bench scale batch liquid slurry catalytic reaction. Each catalyst was suspended in an agitated solution of the reaction (0.8 to 5M) at 22°C under a constant hydrogen over pressure of 0.86 atmospheres. A declining pressure technique was also used as a measure of catalytic activity where the catalyst was suspended in an agitated solution of the three reactants at 80°C at an initial hydrogen pressure of four atmospheres. The reactants selected consisted of acetone, nitrobenzene, itaconic acid, butyronitrile, toluene, and dextrose. The organic functionalities hydrogenated consisted of the conversion of:(1) Carbonyl to alcohol(2) Nitro group to amine group(3) Double carbon bond to a single carbon bond(4) Nitrile group to an amine group(5) Aromatic to a hydroaromatic ring(6) Aldehyde to an alcohol.RSR 587 catalyst, containing 28.5 w/o nickel, provides superior hydrogenation rates over bulk cast RaneyR nickel catalysts by factors ranging from 2 to 20 for selected reactions. Rapid solidification followed by heat treatmen0t at 850°C of Al ∼42 w/o Ni powders yielded the greatest specific catalytic activity and provides a unique enrichment path for the formation of the peritectic phase, A13Ni, and subsequently the most active skeletal nickel pore structure with the least amount of waste aluminum.

DISPLACEMENT OF C4-HYDROCARBON MOLECULES ADSORBED ON PLATINUM

1964 ◽  
Vol 42 (5) ◽  
pp. 1206-1211 ◽  
Author(s):  
S. Affrossman ◽  
R. J. Cvetanović
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Hydrogenation Catalyst ◽  
Active Area ◽  
Special Technique ◽  
Hydrocarbon Molecules

A special technique has been used in an attempt to determine the nature and the amount of the C4-hydrocarbons desorbed by displacement with "poisons" (CO, CS2) from the "active" sites of a platinum on asbestos hydrogenation catalyst. The "active" area of the catalyst determined in this way is found to decrease with increasing adsorption of the poison molecules, and is approximately related in the expected manner to the observed catalytic activity for butene hydrogenation. The likely nature of the adsorbed hydrocarbon species is discussed.

Synthesis of mesoporous iridium nanosponge: a highly active, thermally stable and efficient olefin hydrogenation catalyst

2017 ◽  
Vol 46 (34) ◽  
pp. 11431-11439 ◽  
Author(s):  
Sourav Ghosh ◽  
Balaji R. Jagirdar
Keyword(s):  
Catalytic Activity ◽  
Hydrogenation Catalyst ◽  
High Catalytic Activity ◽  
Capping Agent ◽  
Thermally Stable ◽  
Olefin Hydrogenation ◽  
Highly Active

Capping agent dissolution of Ir@BNHx nanocomposite affords mesoporous iridium nanosponge which exhibits high catalytic activity towards olefin hydrogenation of a variety of substrates.

scholarly journals Fullerene Black: Relationship between Catalytic Activity in n-alkanes Dehydrocyclization and Reactivity in Oxidation, Bromination and Hydrogenolysis

2017 ◽  
Vol 3 (2) ◽  
pp. 131 ◽  
Author(s):  
S.D. Kushch ◽  
P.V. Fursikov ◽  
N.S. Kuyunko ◽  
A.V. Kulikov ◽  
V.I. Savchenko
Keyword(s):  
Catalytic Activity ◽  
Esr Spectroscopy ◽  
Hydrogenation Catalyst ◽  
Spectroscopy Data ◽  
Dangling Bonds ◽  
Catalytic Center ◽  
Fullerene Black ◽  
Amorphous Part

<p>The reactivity of fullerene black in oxidation (by air oxygen or ions MnO<sub>4</sub><sup>–</sup> or Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> in solution), bromination (by Br<sub>2</sub> or (C<sub>4</sub>H<sub>9</sub>)<sub>4</sub>NBr<sub>3</sub>) and hydrogenolysis (without hydrogenation catalyst) are studied. The dehydrocyclization of <em>n</em>-alkanes over fullerene black is realized via the monofunctional mechanism, <em>i.e. </em>the dehydrogenation and cyclization stages proceed on the same catalytic center. The addition of alumina to the catalyst transforms dehydrocyclization mechanism to bifunctional one, when fullerene black acts as dehydrogenation agent. Reactivity studies and ESR spectroscopy data for initial and annealed fullerene black show the presence in fullerene black structure of both non-conjugated multiple and dangling bonds. Nonconjugated bonds determine catalytic activity and reactivity of fullerene black. They are localized in amorphous part of fullerene black. Technological aspects of fullerene black as alkanes dehydrocyclization catalyst are discussed.</p>

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