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1.
| 1. | Replacing Na+ ions by Ca2+in zeolites leads to a significant shift of the region in which thermally stimulated polarographic [TSD] current peaks appear toward higher temperatures. |
| 2. | Reducing the cation content in zeolites leads to a decrease in the intensity of TSD currents. |
| 3. | The data obtained-can be explained by the differences in the distributions of the cations between different crystallographic positions in the zeolite lattices. |
2.
Ya. I. Isakov Kh. M. Minachev G. V. Isagulyants Yu. S. Akhmetov N. N. Rozhdestvenskaya 《Russian Chemical Bulletin》1976,25(11):2267-2270
| 1. | By14C labeling, it has been shown that carbon dioxide will adsorb differently on various synthetic Ca2+-ion-containing zeolites (CaNaY, and dealuminated CaNaY and CaNdNaY) on which benzene is being alkylated by ethylene. The promoting action of CO2 is due to the presence of a weakly adsorbed form of the compound which can be readily displaced by N2 at the reaction temperature. |
| 2. | The CO2 content of the catalyst and its time variation are dependent on the zeolite composition, the re-action temperature, and the moisture content of the CO2. |
| 3. | Under fixed operating conditions, the CO2 content of zeolite 0.67CaNaY and its time variation are the same for C6H6 alkylation by ethylene and for toluene disproportionation. |
3.
| 1. | Indium atoms have been obtained in aqueous solutions of univalent indium by pulse radiolysis. |
| 2. | In0 reacts with In+ to form the dimer In 2 + . |
| 3. | The optical characteristics of these particles, the rate constants for their formation and loss, as well as the oxidation-reduction potentials have been determined. |
4.
| 1. | If the adsorption centers are located at such great distances that the local magnetic field induced by the nuclei of the adsorbate molecule has an appreciable value only at the nucleus of the center nearest to it, the second moment of the NME resonance line from the nuclei of the adsorption centers should increase linearly with increasing adsorption. The slope of this straight line contains information on the position of an individual molecule relative to an adsorption center. |
| 2. | The second moment of the7Li NMR line for zeolite LiA at 120 K increases linearly as the zeolite is filled with water up to an amount of water approximately equal to the number of Li+ in the zeolite. The slope of this straight line corresponds to the average distance between a proton and a7Li nucleus, which equals 0.279 ± 0.1 nm. |
| 3. | As zeolite LiA is filled with water, the7Li NMR resonance line approximates the shape of a Lorentzian line. |
5.
| 1. | The authors have studied the formation of electron and hole paramagnetic centers in gamma-irradiated magnesium hydroxide and oxide with various degrees of dehydration. |
| 2. | Rise in the temperature of preliminary heat treatment of the magnesium oxide causes an increase in the radiation-chemical yield of FS + centers and a decrease in that of V su – centers. |
| 3. | The thermal stability of paramagnetic centers in magnesium oxide increases as the hydroxyl group content decreases. |
6.
| 1. | An increase in the SiO2/Al2O3 ratio (x) in type Y zeolites through dealuminization with ethylenediaminetetraacetic acid leads to an increase in their catalytic activity during the alkylation of benzene with ethylene. |
| 2. | The properties of CaNaY zeolites of the same composition prepared from NaY obtained by hydrothermal synthesis and by dealuminization of samples with a small value of x are identical. |
| 3. | Carbon dioxide exerts an accelerating effect on the Ca forms of dealuminized type Y zeolites of various compositions and has no effect on the properties of NaY'. |
7.
| 1. | The formation of alkenyl carbocations from propylene,1,3-butadiene, and methanol on HTsVK zeolites was followed; they decompose at 513–573 K. |
| 2. | Alkenyl carbocations are characterized by as CCC at 1500–1530 cm–1 in the IR spectra (30 cm–1 isotope shift) and bands in the DRS at: 290–310, 350–380, 430–450, and 520–570 nm. |
8.
B. A. Glazun R. N. Kurnosova M. M. Dubinin I. V. Zhilenkov S. S. Levchenko 《Russian Chemical Bulletin》1976,25(1):8-11
| 1. | In NaA zeolite a homocharge is formed by charges deposited on the surface of the zeolite from the gas gap between the electrode and the specimen. |
| 2. | The existence of thermoelectret effects has been found in the systems NaA-zeolite -air, NaA-helium, NaA-nitrogen, and NaA-oxygen. |
| 3. | The thermoelectret effects are caused by both the accumulation of charges in the specimen and the adsorption of molecules in the electric field. |
| 4. | A low mobility has been noted for adsorbed molecules in the electret state of the system. |
9.
L. M. Kustov L. A. Surina V. B. Kazanskii P. A. Zhdan B. K. Nefedov 《Russian Chemical Bulletin》1988,37(4):633-636
| 1. | By means of diffuse scattering IR spectroscopy and x-ray photoelectron spectroscopy, it has been shown that thermal treatment leads to dealuminization of the lattice of TsVM zeolite and to a substantial decrease in the total number of acid centers with an increase in the relative number of Lewis acid centers, related in particular to extralattice aluminum. |
| 2. | The decrease in the total number of acid centers results in a decrease in pseudo-cumene conversion, but an increase in selectivity of isomerization. It is concluded that the reaction takes place in the mouths of the pores or on the outer surface of the zeolite. |
10.
Kh. M. Minachev V. V. Kharlamov V. I. Garanin D. B. Tagiev 《Russian Chemical Bulletin》1976,25(8):1615-1619
| 1. | Up to a certain point (55%), decationization of NaY zeolites reduces the activity of the zeolites in catalyzing the hydrogenation of 2-methyl-2-butene. Further decationization had no effect on the yield of saturated hydrocarbons. |
| 2. | Plotted as a function of the cation's electrostatic potential, the activity of MNaY zeolites in catalyzing the hydrogenation of 2-methyl-2-butene passes through a maximum. Minimum activity was observed with the NdNaY zeolite. |
| 3. | Experiments in an atmosphere of helium showed that saturated hydrocarbons, resulting from hydrogen redistribution, are frequently formed in the course of reactions on decationized and polyvalent cationic forms of the Y zeolite. |
11.
| 1. | Using seven independent methods it was found that the concentration of the active centers on the surface of-Al2O3, which are responsible for the dehydration, is (9±1)×1017 centers/m2. The catalytically active centers are identical with adsorption centers. |
| 2. | A method of calculating the stochiometry, concentration, and thermodynamics of the surface association reactions has been developed. |
| 3. | The first reaction step proceeds according to the associative bimolecular substitution mechanism, with the formation of an associative intermediate compound. The association enthalpy and entropy have been calculated. |
12.
G. V. Chel'tsova E. I. Karpeiskaya E. I. Klabunovskii 《Russian Chemical Bulletin》1989,38(5):1014-1018
| 1. | Reductive aminolysis of 2-methyl-4-benzylidene-2-oxazolin-5-one in the chiral catalytic system PdCl2-S-phenylglycinol results in the formation of phenylalanine amides with an excess of the SS-diastereomer. |
| 2. | Reductive aminolysis in the catalytic system PdCl2-S-phenylalaninol mainly gives phenylalanine amides with an excess of the RS-diasteromer. |
13.
V. I. Evreinov Z. N. Vostroknutova A. N. Bovin A. N. Degtyarev E. N. Tsvetkov 《Russian Chemical Bulletin》1989,38(1):50-53
| 1. | Using a conductometric method in a mixed THF-CHCl3 solvent, the complex-forming abilities of bis(ortho-(diethoxyphosphinylmethoxy)phenyl) ethers of oligoethylene glycols towards alkali metal cations have been studied. Complex-forming ability towards Li+, Na+, K+, and Rb+ cations depends very much on the length of the polyether chain. In the case of the Cs+ cation the effectiveness increases monotonically with increase in the number of ethylene glycol units. |
| 2. | The complex-forming abilities of the higher members of the series of podands studied — bis(ortho-(diethoxyphosphinylmethoxy)phenyl) ethers of tetraethylene glycol and pentaethylene glycol — towards K+, Rb+, and Cs+ cations are comparable with, and in some cases exceed, those for 18-crown-6 and dibenzo-18-crown-6. |
| 3. | The enhanced effectiveness of the present class of podands (in comparison with podands with ortho-diethoxyphosphinylphenyl terminal groups) towards alkali metal cations of greater radius (K+, Rb+, Cs+) is explained by the participation of the O atom located at the -position to the phosphoryl group in the coordination. |
14.
I. V. Anonimova N. A. Chadaeva L. K. Yuldasheva S. G. Vul'fson A. N. Vereshchagin B. A. Arbuzov 《Russian Chemical Bulletin》1976,25(12):2519-2524
| 1. | It has been shown that 2-bromo-l,3,2-dioxaarsenanes exist in chair conformation with axially oriented As-Br bonds. |
| 2. | Polarity and polarizability parameters have been found for the As-O and As-Br bonds in 2-bromo-l,3,2-dioxaarsenanes. |
| 3. | The so-called -effect is stronger in the O2AsBr group than in the O2AsCl group. |
15.
Carbon dioxide fixation by microalgae photosynthesis using actual flue gas discharged from a boiler 总被引：2，自引：0，他引：2
Matsumoto Hiroyo Shioji Norio Hamasaki Akihiro Ikuta Yoshiaki Fukuda Yoshinori Sato Minoru Endo Noriyoshi Tsukamoto Toshiaki 《Applied biochemistry and biotechnology》1995,(1):681-692
To mitigate CO2 discharged from thermal power plants, studies on CO2 fixation by the photosynthesis of microalgae using actual exhaust gas have been carried out. The results are as follows.
相似文献
| 1. | A method is proposed for evaluating the maximum photosynthesis rate in the raceway cultivator using only the algal physical properties; |
| 2. | Outdoor cultivation tests taking actual flue gas were performed with no trouble or break throughout 1 yr using the strain collected in the test; |
| 3. | The produced microalgae is effective as solid fuel; and |
| 4. | The feasibility studies of this system were performed. The system required large land area, but the area is smaller than that required for other biomass systems, such as tree farms. |
16.
| 1. | 1,2-Oxathiolan-5-one-2-oxides are readily cleaved by nucleophiles (H2O, ROH, HNR2) under mild conditions at the O-CO bond only, with the formation of the -(hydroxysulfinyl)-alkanoic acid derivatives. |
| 2. | 2,1-Benzoxathiol-3-one-1-oxide is cleaved by alcohols at both the O-CO and the O-SO bonds to give the unstable monoesters at the carboxyl and sulfinyl groups. |
| 3. | Unlike 2,1-benzoxathiol-3-one-1-oxide, 1,2-oxathiolan-5-one-2-oxides on boiling with excess alcohols give -(hydroxysulfinyl)alkanoic acid bisesters. |
17.
Khurgin Yu. I. Kudryashova V. A. Bakaushina G. F. Khrapko A. M. Zinov'eva N. B. Grigor'ev A. B. Gaiduk V. I. 《Russian Chemical Bulletin》1976,25(4):906-908
| 1. | The absorption of electromagnetic radiation ( 1.05 mm) by solutions of DMSO in water and DMSO and water in dioxane has been measured in the whole interval of relative concentrations. |
| 2. | The additivity of the absorption in systems containing dioxane, and its absence in the system H2O-DMSO, have been demonstrated. |
| 3. | The possibility of using the absorption of radiation in the millimeter range for the study of solvation in solutions has been shown. |
18.
R. I. Khusnutdinov V. A. Dokichev D. K. Galeev N. F. Asylguzhina S. Z. Sultanov U. M. Dzhemilev 《Russian Chemical Bulletin》1988,37(9):1932-1935
| 1. | Catalytic dimerization of spiro[2.4]hepta-4,6-diene (I) into dispirocyclopropan-5,1'-endotricyclo [5.2.1.02,6]deca-3,8-dien-10,1-cyclopropane (II) was carried out. |
| 2. | It was established that [Rh(CO)2Cl]2 catalyzes transformation of dispirocyclopropan-6,1'-pentacyclo [5.3.0.02,5.03,9.04,8]-decan-10,1-cyclopropane (XI) into the dimer spiro[2.4]hepta-4,6-diene (II). |
| 3. | Upon reduction of dispirocyclopropan-6,l'-pentacyclo[5.3.0.02,5.03,9.04.8]decan-<>-cyclopropane in the presence of PtO2 1,1,3,3-tetramethyl-1,3-bishomocubane is formed. |
| 4. | The possibility of synthesizing adamantane, diamantane, and their derivatives by skeletal isomerization of hydrocarbons obtained from spiro[2.4]hepta-4,6-diene has been shown. |
19.
| 1. | The condensation of 1,2-hydroxylamino oximes with biacetyl leads to 1-hydroxy-2-acetyl-2,4,5,5-tetrasubstituted 3-imidazoline 3-oxides. |
| 2. | When 1-hydroxy-2-acetyl-2,5,5-trimethyl-4-phenyl-3-imidazoline 3-oxide is oxidized the CH3CO group is cleaved to give the 5H-imidazole 1,3-dioxide. |
| 3. | Stable nitroxyl radicals were obtained when the 1-hydroxy-2-oximiaoethyl-2,4,5,5-tetrasubstituted 3-imidazoline 3-oxides are oxidized. |
20.
A. I. Kokorin L. S. Bogach A. B. Shapiro É. G. Rozantsev 《Russian Chemical Bulletin》1976,25(9):1874-1878
| 1. | Nitroxyl biradicals of the triazine, N,N-bis(triazinyl)ethylenediamine, N,N-bis(triazinyl)piperazine, and s-nitropyrimidine series have been prepared. |
| 2. | The ESR spectra of liquid and frozen solutions of these biradicals have been obtained and N. - O group separations calculated. |
| 3. | Toluene solutions of (II), (V), (VI), and (X) biradicals contain at least four different conformations, each with its own value of the exchange integral. |
| 4. | In one of the biradical (V) conformations, spin interaction exchange is through the chain of atoms linking the N.-O fragments. |