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1.
The hydration of tricalcium silicate containing Al2O3 admixture has been investigated using calorimetry, DTA, TG and XRD methods.
Zusammenfassung Mittels kalorimetrischer, DTA-, TG- und XRD-Methoden wurde die Hydratierung von Trikalziumsilikat unter Zusatz von Al2O3 untersucht.
, , , .相似文献
2.
The thermal investigation of the reaction taking place between dichromates and oxalates in the solid state has been done taking two systems of potassium dichromate-potassium oxalate and sodium dichromate-sodium oxalate. The techniques employed include thermogravimetry, differential thermal analysis, infrared spectroscopy and X-ray diffraction studies. The results indicate a stoichiometric reaction of dichromate and oxalate in 11 ratio to give the corresponding chromate as the sole product.
Zusammenfassung Anhand der Systeme Kaliumdichromat-Kaliumoxalat bzw. Natriumdichromat-Natriumoxalat wurde eine thermische Untersuchung der Festkörperreaktion zwischen Dichromaten und Oxalaten durchgeführt. Dazu wurden thermogravimetrische, dififerentialthermoanalytische, IR-spektroskopische und Röntgendiffraktionsverfahren angewendet. Im Ergebnis zeigte sich eine stöchiometrische Reaktion von Dichromat und Oxalat im Verhältnis 11, die das entsprechende Chromat als einziges Produkt liefert.
, , — — . , 11 .相似文献
3.
N. A. Zakarina G. D. Zakumbaeva N. F. Toktabaeva A. Sh. Kuanyshev E. L. Litvyakova 《Reaction Kinetics and Catalysis Letters》1984,26(3-4):441-445
Preparation methods for monodisperse sols of palladium with 9, 15, 30 and 75 Å particles are suggested. It has been revealed that with decreasing size of palladium particles (d25 Å), the dissolved hydrogen species disappear. As a result, their behavior in dimethyl ethynyl carbinol hydrogenation is close to the platinum properties.
9, 15, 30, 75 Å. , (d25 Å) , .相似文献
4.
P. V. Srinivasulu M. Adinarayana B. Sethuram T. Navaneeth Rao 《Reaction Kinetics and Catalysis Letters》1985,27(1):167-172
Kinetics of OsO4 catalyzed oxidation of chalcones by Ce4+ has been studied in aqueous acetic-sulfuric acid medium in the temperature range 313 to 338 K. The order in [oxidant] is zero while the order with respect to [substrate] and [catalyst] are each fractional. The rate of the reaction decreased with increase in percentage of acetic acid while [H+] had practically no effect on the rate The rates of various substituted chalcones (with substituents in the phenyl. ring attached to the moiety) are in the orderp-CH3>m-CH3>H>p-Cl>m-Cl>m-NO2>p-NO2. A mechanism in which formation of a cyclic ester between chalcone and OsO4 in a fast step followed by its decomposition in a rate-determining step is envisaged.
Ce4+, OsO4, - 313–338 . —, —. , [H+] . ( , : -CH3>-CH3>H>-Cl>-NO2>-NO2. , OsO4 , , .相似文献
5.
《Reaction Kinetics and Catalysis Letters》1981,17(3-4):281-286
3,3- . , , . 3,3- 3,3-(). .
The condensation kinetics of chlormethoxyoxirane with cyclohexanone and of 3,3-disubstituted oxetanes with benzaldehyde have been studied via competitive reactions. Aliphatic ketones are less reactive than cyclohexanone and 3,3-di(alkoxymethyl)oxetanes are more reactive than 3,3-di(chloromethyl)oxetanes. A possible reaction mechanism is suggested.相似文献
6.
V. F. Anufrienko I. Sh. Guzman V. V. Zakharov O. I. Adrov A. V. Kucherov 《Reaction Kinetics and Catalysis Letters》1991,43(1):75-79
For the first time ESR spectra of47Ti-enriched Ziegler system Ti-TIBA in toluene have been studied. For the ratio Ti/Al1, more accurate h. f. s. constants have been found. For Ti/Al1/15 no h. f. s. have been observed, which is ascribed to ordering due to the cooperative Jahn-Teller effect.
TiCl4+ 47Ti. Ti/Al1 . Ti/Al1/15 , -.相似文献
7.
《Reaction Kinetics and Catalysis Letters》1979,10(4):319-323
, [(-C5H8OCH3)PdCl·OCH3]– [(-C5H8OCH3)Pd(OCH3)2]–, (-) .
The two methanolato species [(-C5H8OCH3)PdCl(OCH3)]– and [(-C5H8OCH3Pd(OCH3)2]– are found to be reactive in reductive decomposition.相似文献
8.
Radical intermediates formed at 25°C in the presence and absence of oxygen during the photolysis of anthraquinone in aromatic, cyclic and aliphatic hydrocarbon solvents were trapped by 2,6-dichloronitrosobenzene, 2,6-dibromonitrosobenzene and 2,4,6-tribromonitrosobenzene. The resulting nitroxide radicals have been characterized in situ by ESR spectra.
: 2,6-, 2,6- 2,4,6-— , , 25°C. .相似文献
9.
The study of CCl4 adsorption shows that the increase of dispersion potential can increase the specific adsorption in pores up to 3 nm in size.
CCl4 , 3 .相似文献
10.
A highly dispersed (Ø (Ru)<10 Å, from electron microscopy) Al2O3-supported catalyst and not so well dispersed silica supported Pt, Ru, Pt, Ru-alloy catalysts were investigated. Oxygen coverage of Ru is found to be close to 2 at 20 °C over the monometallic Ru catalysts as well as over the Pt, Ru-alloy catalysts.
(Ø (Ru)<10 Å ) Al2O3 Pt Ru Pt Ru . Ru 2 20°C Ru, Pt Ru.相似文献