共查询到10条相似文献,搜索用时 218 毫秒
1.
《Reaction Kinetics and Catalysis Letters》1980,13(2):131-135
1- . - n3. 1-.
The free-radical cotelomerization of ethylene and 1-hexene with CCl4 has been studied. Both homo- and cotelomers (n3) are formed. The method of competitive kinetics has been applied to estimate the transfer constants and reactivity ratios for a number of polychloroalkyl radicals with ethylene and 1-hexene.相似文献
2.
V. Cortés Corberán G. Kremenic L. González Tejuca 《Reaction Kinetics and Catalysis Letters》1988,36(1):235-240
The effect of UO3 on the acidity of MoO3–UO3/SiO2 catalysts has been studied by means of infrared spectroscopy of adsorbed pyridine. The surface acidity exhibited a maximum for the same U/(U+Mo) atomic ratio (=0.11) that yielded a maximum in total conversion for isobutene oxidation. The catalytic properties for oxidation are discussed in terms of the acidic properties of the samples.
UO3 MoO3–UO3/SiO2 . U/(U+Mo)=0,11, . , .相似文献
3.
《Reaction Kinetics and Catalysis Letters》1982,21(3):327-333
- () SiAl. , - 125 /–1. SiAl - .
Studies of the acidic and catalytic properties of superhigh silica (SHS) zeolites with different SiAl ratios on a vacuum-circulation reactor indicate that n-hexane cracking is a first order reaction with the effective activation energy of 125 kJ/mol–1. With increasing the SiAl ratio the acidity and activity of SHS-zeolites decrease.相似文献
4.
L. A. Vostrikova N. G. Maksimov K. G. Ione 《Reaction Kinetics and Catalysis Letters》1981,18(3-4):397-400
Comments are given on the paper Alternative Interpretation of Infrared Spectra of the Zeolite NaHY+Butene-1 System of Forster and Seelemann /2/. Our previous paper /1/ was partly revised but the usefulness of comprehensive studies by infrared and temperature-programmed desorption methods has been emphasized.
: NaHY+-1. [2]. [1] , - .相似文献
5.
The entropies of trigonal, monoclinic and glassy selenium are discussed based on the ATHAS data bank data and third law entropy considerations. Within the error limit both trigonal and monoclinic selenium have zero residual entropy at zero kelvin temperature. The residual entropy of glassy Se is similar in magnitude to other linear macromolecules.
This work was supported by the National Science Foundation, Polymers Program, Grant=DMR 83-17097. 相似文献
Zusammenfassung Basierend auf Daten der ATHAS-Datenbank und auf den dritten Hauptsatz der Thermodynamik basierenden Entropiebetrachtungen werden die Entropien von trigonalem, monoklinem und glasartigem Selen diskutiert. Beim absoluten Nullpunkt haben innerhalb der Fehlergrenzen sowohl das trigonale als auch das monokline Selen eine Restentropie von Null. Die Restentropie von glasartigem Selen ist größenordnungsmäßig gleich der anderer linearer Makromoleküle.
, , ATHAS . , , . .
This work was supported by the National Science Foundation, Polymers Program, Grant=DMR 83-17097. 相似文献
6.
V. A. Sobyanin 《Reaction Kinetics and Catalysis Letters》1986,32(2):287-292
The adsorption and dissociation of nitric oxide on the Pt(100) surface have been studied using Electron Energy Loss Spectroscopy.
Pt(100).相似文献
7.
Ph. Touzain 《Journal of Thermal Analysis and Calorimetry》1976,9(3):441-450
Résumé Le comportement thermique du monooxyde de césium Cs2O a été déterminé par analyse thermique différentielle, thermogravimétrie et diffraction X. L'utilisation de différents matériaux pour contenir ce produit a été nécessaire pour cerner les phénomènes propres à cet oxyde. On trouve la température de fusion de Cs2O=495±5° et sa pression de vapeur égale à 10–4 Torr à 240°. Aucune transformation allotropique n'est mise en évidence.
The thermal behaviour of cesium monoxide (Cs2O) was determined by differential thermal analysis, thermogravimetry and X-ray diffraction. The use of several materials as sample holders was necessary to clarify the properties of this oxide. The melting point of Cs2O was found to be 495±5°, and its vapour pressure equal to 10–4 torr at 240°. No allotropic transformation was observed.
Zusammenfassung Es wird über die DTA, TG und röntgenographische Untersuchung des Caesium monoxyds berichtet. Verschiedene Materien als Probenbehälter wurden herangezogen damit die dem Oxyd eigene Eigenschaften klar festgelegt werden können. Der Schmelzpunkt von Cs2O liegt bei 495±5°, der Dampfdruck beträgt 10–4 Torr bei 240°. Es fand keine allotrope Umwandlung statt.
Cs2O , . , , . , 495±5 °C, 10–4 240 °. .相似文献
8.
A polymer catalyst has been synthesized on the basis of Amberlite IRA-45 anion-exchange resin modified with molybdenum hexacarbonyl. Its catalytic activity in the epoxidation of propylene with tert-butyl hydroperoxide is similar to the activity of Mo(CO)6 used under homogeneous conditions.
, - Amberlite IRA-45, . - Mo(CO)6, .相似文献
9.
The hydrogen sorption of carbon-supported platinum catalysts, studied by the potentiodynamic method, differs significantly from that of unsupported platinum. The difference depends on the preparation method and on the nature of the support. Possible explanations are suggested as (i) some kind of interaction between metal and support atoms during impregnation, (ii) high dispersity (amorphous structure) and (iii) hydrogen spillover onto the carbon support.
Pt/C, . . (I) , (II) ( ), (III) .相似文献
10.
《Reaction Kinetics and Catalysis Letters》1979,11(1):75-78
2--4--2 -2. , .
The kinetics of intramolecular condensation of 2-methyl-4-phenylbutanol-2 have been studied in the presence of the strongly acidic cation exchanger KU-2. The reaction is first order with respect to the catalyst. A linear relationship is found between the rate constant and the extent of modification by sodium ions of the cation exchanger.相似文献