Basicity and catalytic properties of multicomponent catalysts for oxidative ammonolysis of propane

1982 ◽  
Vol 18 (1-2) ◽  
pp. 17-20 ◽  
Author(s):  
S. Yu. Burylin ◽  
Z. G. Osipova ◽  
V. D. Sokolovskii
Keyword(s):  
Catalytic Properties ◽  
Oxidative Ammonolysis ◽  
Multicomponent Catalysts

Catalytic properties and phase composition of multicomponent catalysts for oxidative ammonolysis of propane

1982 ◽  
Vol 18 (1-2) ◽  
pp. 7-11 ◽  
Author(s):  
S. Yu. Burylin ◽  
Z. G. Osipova ◽  
V. D. Sokolovskii ◽  
I. P. Olenkova
Keyword(s):  
Phase Composition ◽  
Catalytic Properties ◽  
Oxidative Ammonolysis ◽  
Multicomponent Catalysts

Oxidative ammonolysis of methylpyrazine over binary catalytic systems: III. Phosphorus-molybdenum system: Catalytic properties and the active component

2000 ◽  
Vol 41 (2) ◽  
pp. 222-230 ◽  
Author(s):  
V. M. Bondareva ◽  
T. V. Andrushkevich ◽  
N. N. Chumachenko ◽  
R. I. Maksimovskaya ◽  
L. M. Plyasova ◽  
...  
Keyword(s):  
Active Component ◽  
Catalytic Properties ◽  
Catalytic Systems ◽  
Oxidative Ammonolysis

scholarly journals OXIDATIVE AMMONOLYSIS OF 4-METHYLPYRIDINE ON OXIDE VANADIUM-TITANIUM-ZIRCONIUM CATALYST MODIFIED BY TIN AND TUNGSTEN OXIDES

2021 ◽  
Vol 73 (1) ◽  
pp. 196-203
Author(s):  
T. P MIKHAILOVSKAYA ◽  
◽  
R. KURMAKYZY ◽  
D.K. TOLEMISOVA ◽  
K. A. KADIRBEKOV ◽  
...  
Keyword(s):  
Structural Changes ◽  
High Selectivity ◽  
Catalytic Properties ◽  
Main Process ◽  
Contact Conditions ◽  
Oxidative Ammonolysis ◽  
Tungsten Oxides ◽  
Tio2 Anatase ◽  
Oxide Vanadium

Catalysts based on vanadium pentoxide modified by Ti, Sn, Zr and W oxides were tested in the oxidative ammonolysis of 4-methylpyridine. The role of the main process parameters such as temperature, the ratio of the initial components in the conversion of the methyl group to the nitrile one, and the optimal conditions for the oxidative ammonolysis of 4-methylpyridine were determined. It is determined that the V-Ti-Zr-O-catalyst and the sample containing 9% of tungsten oxide are superior in catalytic activity to the V-Ti-Zr-Sn-O contact. Conditions that ensure a high selectivity for the formation of 4-cyanopyridine were found. The highest yield of the target product (85-86%) was obtained on V-Ti-Zr-W-O at 270 °C, and the yield of 4-cyanopyridine was 87.5% at 310° C on the V-Ti-Zr-Sn-O catalyst. The phase composition and structural changes occurring in modified vanadium oxide catalysts have been studied. It is determined that mixed V-Ti-Zr-Sn-O and V-Ti-Zr-W-O catalysts contain ZrV2O7, the monoclinic modification of ZrO2 (baddeleyite), TiO2 (anatase), SnO2, WO3, and V2O5. In catalysts, it can exist in small amounts as a separate VO2 phase. The V-Ti-Zr-W-O catalyst showed the best catalytic properties. It has highactivity and selectivity towards 4-cyanopyridine.

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

Electron distribution change of small nickel particles encaged in X zeolite in presence of Ce3+ ions, related to their catalytic properties

1986 ◽  
Vol 83 ◽  
pp. 619-621 ◽  
Author(s):  
F. Vergand ◽  
B. Iraqi ◽  
C. Bonnelle ◽  
E. Ramaroson ◽  
M.F. Guilleux ◽  
...  
Keyword(s):  
Electron Distribution ◽  
Catalytic Properties ◽  
Distribution Change ◽  
Nickel Particles ◽  
X Zeolite

Countercation effects on surface and catalytic properties of 12-tungstophosphates

1992 ◽  
Vol 89 ◽  
pp. 681-693
Author(s):  
A Anwar ◽  
AA Abdel-Ghaffar
Keyword(s):  
Catalytic Properties

On the Preparation of Bovine α-Thrombin

1978 ◽  
Vol 39 (01) ◽  
pp. 193-200 ◽  
Author(s):  
Erwin F Workman ◽  
Roger L Lundblad
Keyword(s):  
Immobilized Enzyme ◽  
Catalytic Properties ◽  
Specific Activity ◽  
Guanidine Hydrochloride ◽  
Low Molecular Weight ◽  
Reversible Process ◽  
Gel Beads ◽  
Tissue Thromboplastin ◽  
C 50 ◽  
Hydrolysis Of

SummaryAn improved method for the preparation of bovine α-thrombin is described. The procedure involves the activation of partially purified prothrombin with tissue thromboplastin followed by chromatography on Sulfopropyl-Sephadex C-50. The purified enzyme is homogeneous on polyacrylamide discontinuous gel electrophoresis and has a specific activity toward fibrinogen of 2,200–2,700 N.I.H. U/mg. Its stability on storage in liquid media is dependent on both ionic strenght and temperature. Increasing ionic strength and decreasing temperature result in optimal stability. The denaturation of α-thrombin by guanidine hydrochloride was found to be a partially reversible process with the renatured species possessing properties similar to “aged” thrombin. In addition, the catalytic properties of a-thrombin covalently attached to agarose gel beads were also examined. The activity of the immobilized enzyme toward fibrinogen was affected to a much greater extent than was the hydrolysis of low molecular weight, synthetic substrates.

Sorption and catalytic properties of a composite material based on bentonite clay and polyethylene glycol

2019 ◽  
Vol 128 (3) ◽  
pp. 82-93
Author(s):  
N.D. Nurtazina ◽  
◽  
G.A. Seilkhanova ◽  
D.N. Akbayeva ◽  
A.N. Imangaliyeva ◽  
...  
Keyword(s):  
Composite Material ◽  
Polyethylene Glycol ◽  
Catalytic Properties ◽  
Bentonite Clay
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