Examination of High-Loaded Nickel Catalysts by IR Spectroscopy: Effect of the Support and Pd on Surface Properties

1992 ◽  
Vol 57 (12) ◽  
pp. 2575-2582 ◽  
Author(s):  
Květa Jirátová ◽  
Lenka Morávková ◽  
Hana Šnajdaufová ◽  
Evgenii A. Paukshtis
Keyword(s):  
Ir Spectroscopy ◽  
Surface Properties ◽  
Diethylene Glycol ◽  
Reductive Amination ◽  
Nickel Catalysts ◽  
Ammonia Molecule ◽  
Catalyst Stability ◽  
Catalyst Acidity ◽  
Effect Of The Support

Activation of the ammonia molecule and subsequent adsorption of the NH2 fragment on the surface of the NiO + Pd/TiO2 catalysts, in contrast to NiO + Pd/SiO2 catalysts, was demonstrated by IR spectroscopy. The decrease in the NiO + Pd/TiO2 catalyst acidity was manifested in the higher catalyst stability in reductive amination of diethylene glycol to morpholine.

Reductive Amination of Diethylene Glycol to Morpholine over Supported Nickel Catalysts: Zeolites as Catalyst Admixtures

1992 ◽  
Vol 57 (4) ◽  
pp. 901-908 ◽  
Author(s):  
Květa Jirátová ◽  
Hana Šnajdaufová ◽  
Lenka Morávková ◽  
Ludmila Kubelková
Keyword(s):  
Chemical Composition ◽  
Surface Properties ◽  
Amorphous Silica ◽  
Diethylene Glycol ◽  
Reductive Amination ◽  
Catalytic Properties ◽  
Nickel Catalysts ◽  
Phase Changes ◽  
Zeolite Surface ◽  
Supported Nickel Catalysts

The effect of HZSM-5, H-silicalite and amorphous silica admixtures on the surface properties of nickel catalysts as well as on their activities, selectivities and stabilities in the reductive amination of diethylene glycol was studied. It was found that, in comparison with amorphous silica, zeolites do not positively affect the catalytic properties of nickel catalysts. In addition, the acidity of the zeolites, the dispersity of the nickel phase, changes in the chemical composition during the reaction and adsorption of the reaction components or intermediates on the surface and consequent blocking of the zeolite surface played a role.

Chemisorption of Oxygen on Supported Nickel Catalysts

1993 ◽  
Vol 58 (4) ◽  
pp. 839-844 ◽  
Author(s):  
Hana Zahradníková ◽  
Olga Šolcová ◽  
Květa Jirátová
Keyword(s):  
Catalytic Activity ◽  
Oxygen Uptake ◽  
Diethylene Glycol ◽  
Reductive Amination ◽  
Nickel Catalysts ◽  
Oxygen Chemisorption ◽  
Supported Nickel Catalysts

One unsupported nickel catalysts (about 55 wt.% Ni) supported on SiO2, Al2O3, TiO2, Nb2O5, ZrO2, V2O5 and ZnO were characterized by pulse dynamic oxygen chemisorption measured at -78 °C and evaluated in the reaction of reductive amination of diethylene glycol. Correlation was obtained between their oxygen uptake and catalytic activity.

Effect of the support on the reducibility of high-loaded nickel catalysts

1993 ◽  
Vol 94 (2) ◽  
pp. 153-160 ◽  
Author(s):  
O SOLCOVA ◽  
D UECKER ◽  
U STEINIKE ◽  
K JIRATOVA
Keyword(s):  
Nickel Catalysts ◽  
Effect Of The Support

Unsymmetrical α-diimine palladium catalysts and their properties in olefin (co)polymerization

2017 ◽  
Vol 1 (5) ◽  
pp. 967-972 ◽  
Author(s):  
Xuelin Sui ◽  
Changwen Hong ◽  
Wenmin Pang ◽  
Changle Chen
Keyword(s):  
Surface Properties ◽  
Palladium Catalysts ◽  
Nickel Catalysts ◽  
Diimine Ligands ◽  
Bimodal Polyethylene

Interconvertible rac and meso forms of α-diimine ligands. Nickel catalysts led to the formation of bimodal polyethylene. Palladium catalysts led to the formation of unimodal polymers. The tunable mechanical and surface properties of polyolefin.

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