On thermodynamic and kinetic characteristics applicable in evaluating the relative catalytic activity of oxides

1970 ◽  
Vol 4 (1) ◽  
pp. 31-35
Author(s):  
G. I. Golodets ◽  
Yu. I. Pyatnitskii ◽  
V. V. Goncharuk
Keyword(s):  
Catalytic Activity ◽  
Kinetic Characteristics ◽  
Relative Catalytic Activity

The relative catalytic activity of acids in hydrolytic caprolactam polymerization

1973 ◽  
Vol 5 (3) ◽  
pp. 339-340
Author(s):  
L. N. Mizerovskii ◽  
Yu. S. Paikachev ◽  
B. G. Silanteva ◽  
N. V. Sholichev
Keyword(s):  
Catalytic Activity ◽  
Caprolactam Polymerization ◽  
Relative Catalytic Activity

DECOMPOSITION OF SODIUM HYPOCHLORITE: THE CATALYZED REACTION

1956 ◽  
Vol 34 (4) ◽  
pp. 479-488 ◽  
Author(s):  
M. W. Lister
Keyword(s):  
Catalytic Activity ◽  
Sodium Hypochlorite ◽  
Small Extent ◽  
Copper Oxides ◽  
Iron Cobalt ◽  
First Order ◽  
Cobalt Nickel ◽  
Nickel Copper ◽  
Relative Catalytic Activity ◽  
Mechanism Of The Reaction

The catalyzed decomposition of sodium hypochlorite has been examined; the catalysts tried were manganese, iron, cobalt, nickel, and copper oxides. It was shown that in no case was the decomposition to chlorate and chloride accelerated, only the reaction to chloride and oxygen. Manganese and iron did not catalyze even the latter reaction, or only to a very small extent; this was in fairly concentrated sodium hypochlorite containing some sodium hydroxide. The manganese and iron are largely oxidized to permanganate and ferrate under these conditions. It was found that copper could catalyze the formation of permanganate and ferrate, and nickel the formation of permanganate. Cobalt catalyzed the reaction going to oxygen, and the rate was proportional to the cobalt added, but little dependent on the hypochlorite concentration; the same is true of nickel. Copper (as reported earlier) gives a catalyzed reaction not far from first order in hypochlorite. The activation energies were measured, and were consistent with the relative catalytic activity of these metals. The mechanism of the reaction is briefly discussed.

scholarly journals Implication of Ile-69 and Thr-182 residues in kinetic characteristics of IRT-3 (TEM-32) beta-lactamase.

1996 ◽  
Vol 40 (10) ◽  
pp. 2434-2436 ◽  
Author(s):  
S Farzaneh ◽  
E B Chaibi ◽  
J Peduzzi ◽  
M Barthelemy ◽  
R Labia ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Catalytic Activity ◽  
Water Molecule ◽  
Side Chains ◽  
Beta Lactamase ◽  
Kinetic Characteristics ◽  
Beta Lactamases ◽  
Inhibitor Resistance

The substitution of a methionine for an isoleucine at position 69 (Met69Ile), which causes inhibitor resistance to TEM-type beta-lactamases (IRT-3 and IRT-I69), altered the positions of the Asn-170 and Glu-166 side chains as well as the position of the catalytic water molecule. A novel hydrogen bond between the hydroxyl of Thr-182 and the carbonyl of Glu-64 was expected to be responsible for the increase in the catalytic activity of the IST-T182 and IRT-3 enzymes compared with those of TEM-1 and IRT-169, respectively.

Complex iron catalytic systems: relative catalytic activity of various components

1994 ◽  
Vol 8 (1) ◽  
pp. 53-55 ◽  
Author(s):  
Malvina Farcasiu ◽  
Patricia A. Eldredge ◽  
Steven C. Petrosius
Keyword(s):  
Catalytic Activity ◽  
Catalytic Systems ◽  
Relative Catalytic Activity

Catalytic Properties of Cobalt Phthalocyanines Chemically Bonded to Polymer Anchored onto Silochrome Surface

1999 ◽  
Vol 03 (03) ◽  
pp. 210-215 ◽  
Author(s):  
S. A. BORISENKOVA ◽  
E. G. GIRENKO ◽  
B. G. GHERASSIMOV ◽  
L. M. MAZYARKINA ◽  
V. P. EROFEEVA ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxidation Process ◽  
Catalytic Properties ◽  
Sulfide Oxidation ◽  
Cobalt Phthalocyanine ◽  
Kinetic Characteristics ◽  
Catalytic Systems ◽  
Specific Catalytic Activity ◽  
Order Of Magnitude ◽  
Polymer Anchored

Catalytic systems consisting of cobalt phthalocyanine grafted to maleic anhydride-styrene copolymer chemically linked with γ-aminopropylated silochrome have been prepared. In the process of sulfide oxidation with air oxygen the specific catalytic activity of these systems depends strongly on the phthalocyanine concentration in the catalyst. At low phthalocyanine concentrations (below 0.4 × 10−6 mol g−1) the catalytic activity is more than an order of magnitude larger than that of homogeneous catalysts and cobalt phthalocyanine adsorbed on a silochrome surface. The different ways of preparing the catalysts are reflected in the kinetic characteristics of the oxidation process.

High resolution electron microscopy of lanthanum phosphate crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 274-275
Author(s):  
J. C. Wheatley ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
High Resolution ◽  
Petroleum Industry ◽  
High Resolution Electron Microscopy ◽  
Lanthanum Phosphate ◽  
Good Catalyst ◽  
Resolution Electron ◽  
Good Catalytic Activity ◽  
Physical And Chemical

Rare-earth phosphates are of particular interest because of their catalytic properties associated with the hydrolysis of many aromatic chlorides in the petroleum industry. Lanthanum phosphates (LaPO4) which have been doped with small amounts of copper have shown increased catalytic activity (1). However the physical and chemical characteristics of the samples leading to good catalytic activity are not known.Many catalysts are amorphous and thus do not easily lend themselves to methods of investigation which would include electron microscopy. However, the LaPO4, crystals are quite suitable samples for high resolution techniques.The samples used were obtained from William L. Kehl of Gulf Research and Development Company. The electron microscopy was carried out on a JEOL JEM-100B which had been modified for high resolution microscopy (2). Standard high resolution techniques were employed. Three different sample types were observed: 669A-1-5-7 (poor catalyst), H-L-2 (good catalyst) and 27-011 (good catalyst).

The design and catalytic performance of molybdenum active sites on an MCM-41 framework for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran

2019 ◽  
Vol 9 (3) ◽  
pp. 811-821 ◽  
Author(s):  
Zhao-Meng Wang ◽  
Li-Juan Liu ◽  
Bo Xiang ◽  
Yue Wang ◽  
Ya-Jing Lyu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Mcm 41

The catalytic activity decreases as –(SiO)3Mo(OH)(O) > –(SiO)2Mo(O)2 > –(O)4–MoO.

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