共查询到10条相似文献，搜索用时 234 毫秒
1.
S. Kowalak 《Reaction Kinetics and Catalysis Letters》1982,19(1-2):35-42
Cao–CaF2 catalysts containing 0–100%CaF2 have been studied concerning their activity in different reactions. Maxima of activity for butene isomerization and isopropanol decomposition as well as selectivity for the alcohol dehydration were found for the sample with equimolar ratio of the components. No sample was active in cumene cracking. Suggestions are made concerning the reaction mechanisms and the active centers involved.
CaO–CaF2, 0–100% CaF2, . , , . . .相似文献
2.
Chemical oscillations occur during the uncatalyzed oxidation of a number of phenol and aniline derivatives by acidic bromate.
.相似文献
3.
C. Cativiela J. A. Mayoral E. Melendez R. Usón L. A. Oro M. T. Pinillos 《Reaction Kinetics and Catalysis Letters》1982,21(1-2):173-177
Z-2-benzamido(acetamido)-3-(3-indolyl)-2-propenoic acids were hydrogenated with neutral and cationic rhodium(I) complexes containing the chiral diphosphine (–) or (+)–2,3-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)-butane [(–) or (+)–DIOP].
Z-2- ()-3-(3-)-2- () (I), (–) (+)-2,3--2,3--1,4- ()-.相似文献
4.
A. R. González-Elipe G. Munuera J. Soria 《Reaction Kinetics and Catalysis Letters》1981,18(3-4):367-370
The presence of CO2 on TiO2 affects the process of oxygen photo-adsorption depending on the hydroxylation state of the surface. In dehydroxylated samples CO2 blocks the formation of O
3
–
and O
2
–
. On H2O2/TiO2 samples pretreated in the range of 150–200°C it leads to CO2–O
2
–
species.
, Cu(II). . .相似文献
5.
《Reaction Kinetics and Catalysis Letters》1979,10(3):271-274
: . - .
Examples are given of the non-uniqueness of the inverse problem of chemical kinetics. i.e. determination of the rate constants from experimental data. The results are interpreted via a kinetic model for the complex reaction of phenol alkylation by methanol on -Al2O3.相似文献
6.
R. Selke 《Reaction Kinetics and Catalysis Letters》1979,10(2):135-138
A simple method for preparing carbohydrate-bis-phosphinites of methyl -D-glucopyranosides of glucose and galactose protected by benzylidene groups in 4,6-position leads to chelating ligands which are useful in the asymmetric hydrogenation of prochiral aminoacid precursors catalyzed by rhodium(I), producing optical yields up to 75%. Cationic complexes are particularly active.
--D- 4,6- - (I) 75%. .相似文献
7.
P. S. Radhakrishnamurti H. P. Panda D. C. Pradhan 《Reaction Kinetics and Catalysis Letters》1986,31(1):79-84
Title reactions are acid catalyzed and strongly dependent on the permittivity of the medium. With Cr(VI) indene reacts faster than trans-stilbene, but with V(V), trans-stilbene reacts faster than indene. The mechanism is discussed.
. Cr(VI) , -, V(V) - , . , .相似文献
8.
T. Sodesawa 《Reaction Kinetics and Catalysis Letters》1986,32(1):117-121
Hexadiene formation from 2-propanol was investigated in view of acid-base properties of Ca–P–O catalysts with the Ca/P atomic ratio varying from 1.5 to 5.0. The catalytic activity in hexadiene formation increased up to a maximum at Ca/P=2.0, having almost the same amount of weak acidic sites as weak basic sites, and decreased with futher increase in Ca/P ratio.
2- - Ca–P–O Ca/P, 1,5 5,0. , Ca/P=2, , Ca/P.相似文献
9.
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
10.
Hydrogen influences the activity and selectivity of a Pt/H-ZSM-5 zeolite in ethane aromatization by favoring hydrogenolysis and suppressing dehydrogenation and coking. H2 formed during the reaction inhibits the aromatization activity.
Pt/H-ZSM-5 , . H2, , .相似文献