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Vol 487, No 2 (2019)
- Year: 2019
- Articles: 5
- URL: https://journals.rcsi.science/0012-5016/issue/view/9268
Physical Chemistry
Low-Temperature Partial Oxidation of Dimethyl Ether to Hydrogen-Rich Gas over CuO–CeO2/γ-Al2O3 Catalysts for Fuel Cell Supply
Abstract
The CuO–CeO2/γ-Al2O3 systems have good prospects as catalysts for partial oxidation of dimethyl ether (DME) with air to give hydrogen-rich gas for fuel cell feeding. At atmospheric pressure, temperature of ~350°C, and reaction mixture flow rate of 7 L/(gcat h) and the DME : O2 : N2 molar ratio of 1 : 1 : 4 (DME : air = 1 : 5), the catalysts provide complete DME conversion to hydrogen-rich gas with a low content of CH4 (≤0.8 mol %) and H2 production rate of ~3.1 L/(gcat h).
95-98
Experimental Investigation of the Efficiency of the Electroflotation Recovery of a Mixture of a Poorly Soluble Cerium Group Metal Compounds from Aqueous Solutions
Abstract
Electroflotation recovery of a mixture of poorly soluble cerium group metal (Ce, La, Nd, Pr, Sm) compounds from solutions modeling industrial wastewater was investigated. The effect of the cation additives SEPTAPAV KhSV.50 and Superfloc C-494 on the electroflotation efficiency indices was determined. The effect of the pH of the solution and the concentration of the precipitant Na2CO3 on the efficiency of the electroflotation recovery of a mixture of compounds of five cerium group metals was studied to explore the feasibility of industrial electroflotation recovery of poorly soluble compounds.
99-102
On the Properties of Prenucleation (Protomineral) Clusters
Abstract
For the first time, the characteristic properties of protomineral (precrystallization) clusters—kvatarons—formed in supersaturated media and considered as special forms of the structural organization of matter in the nanoworld have been systemically described. The possible existence of such clusters was reported by us in 1998, and nowadays the phenomenon of precrystallization structurization of matter is already recognized as a proven fact, and there is still little information about their unusual properties and behavior, direct observations are absent.
103-105
New Fibrillar Composites Based on Biodegradable Poly(3-hydroxybutyrate) and Polylactide Polyesters with High Selective Absorption of Oil from Water Medium
Abstract
Ultrafine polyester fibers composed of poly(3-hydroxybutyrate), polylactide, and their various blends were obtained by electrospinning. The fibers were shown to have high absorption capacity towards oil, which is comparable with that of currently used absorbents. An advantage of the proposed systems is their biodegradability, which allows their subsequent disposal. In combination with moderate water absorption, the systems being developed can be considered as promising absorbents for crude oil and oil products from oil–water media in case of environmental accidents and water pollution.
106-108
Heat Capacity and Thermodynamic Properties of SmFeGe2O7 in the Range 350–1000 K
Abstract
SmFeGe2O7 germanate has been synthesized by solid-state reactions from stoichiometric mixtures of starting oxides using multistage sintering in the temperature range 1273‒1473 K. The effect of temperature on the heat capacity of the compound has been studied by differential scanning calorimetry. On the basis of the dependence Cp = f(T), the thermodynamic properties of this compound have been calculated.
109-112