Polymerization of ethylene oxide on strontium carbonate and the influence of adsorption of water on the catalytic activity

1964 ◽  
Vol 13 (4) ◽  
pp. 708-710
Author(s):  
K. S. Kazanskii ◽  
G. V. Korovina ◽  
B. I. Vainshtok ◽  
S. G. �ntelis
Keyword(s):  
Catalytic Activity ◽  
Ethylene Oxide ◽  
Strontium Carbonate ◽  
Adsorption Of Water

Support morphology-dependent catalytic activity of the Co/CeO2 catalyst for the aqueous-phase hydrogenation of phenol

2020 ◽  
Vol 44 (22) ◽  
pp. 9298-9303
Author(s):  
Jinzhi Lu ◽  
Zhanwei Ma ◽  
Xuemei Wei ◽  
Qinsheng Zhang ◽  
Bin Hu
Keyword(s):  
Catalytic Activity ◽  
Aqueous Phase ◽  
Adsorption Of Water

The less hydrophilic Co/r-CeO2 catalyst inhibits the adsorption of water and further promotes the adsorption and activation of phenol.

On the influence of strontium carbonate on improving the photo-catalytic activity of strontium bismuthate Sr6Bi2O11

2019 ◽  
Vol 335 ◽  
pp. 492-501 ◽  
Author(s):  
D.S. Shtarev ◽  
A.V. Shtareva ◽  
V.Ju. Mikhailovski ◽  
E.O. Nashchochin
Keyword(s):  
Catalytic Activity ◽  
Strontium Carbonate ◽  
Photo Catalytic Activity

Behaviour of CoNaA zeolites in interaction with water

1980 ◽  
Vol 45 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Blanka Wichterlová ◽  
Ludmila Kubelková ◽  
Pavel Jírů
Keyword(s):  
Catalytic Activity ◽  
Infrared Spectroscopy ◽  
Adsorbed Water ◽  
The State ◽  
Molecular Water ◽  
Oh Groups ◽  
Adsorption Of Water ◽  
Stretching Vibrations

The influence of dehydration and adsorption of water on the coordination of cations, the state of adsorbed water, and stretching vibrations of CoNaA and NaA zeolites was investigated by means of electronic and infrared spectroscopy. Complexes of Co2+ change their symmetry from octahedral through tetrahedral to planar trigonal. The role of ligands play both skeletal oxygens and molecular water. The formation of OH groups either on skeleton or on Co2+ ions was not found; the existence of these groups was assumed in the literature to explain the catalytic activity of CoNaA zeolites in the isomerization of butenes.

The Structure of Radiation Cross-Linked Poly (ethylene oxide) Gels

1971 ◽  
Vol 29 ◽  
pp. 76-77
Author(s):  
C. E. Cluthe ◽  
G. G. Cocks
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Parallel Plate ◽  
Average Molecular Weight ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Nitrogen Gas ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Initial Viscosity

Aqueous solutions of a 1 weight-per cent poly (ethylene oxide) (PEO) were degassed under vacuum, transferred to a parallel plate viscometer under a nitrogen gas blanket, and exposed to Co60 gamma radiation. The Co60 source was rated at 4000 curies, and the dose ratewas 3.8x105 rads/hr. The poly (ethylene oxide) employed in the irradiations had an initial viscosity average molecular weight of 2.1 x 106.The solutions were gelled by a free radical reaction with dosages ranging from 5x104 rads to 4.8x106 rads.

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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