Advanced Materials Research Vols. 781-784

Abstract: The optically pure ethyl nipecotate is an important drug intermediates. It was used for a variety of synthesis of APIs and pharmaceutical intermediates. In this paper we launched a study of the split of ethyl nipecotate. An efficient resolution of (±)-nipecotic acid has been achieved by the fractional crystallization with good yield and high enatio. The compound (S)-ethyl-1-(2-thiopheneacetyl)-3-piperidine-carboxylate is an investigational immune potentiating agent targeting direct stimulation of immune cells, useful for the prevention of infectious diseases in livestock.

Abstract: The copper-doped ZnS particles were immobilized on the surface of Hexafluorobutyl acrylate-co-methacrylic acid (poly (HFBA-co-MAA)) which synthesized by bulk polymerization electrospun nanofibers. The fluoropolymer fibers, which have around 200 nm in average diameter, of poly (HFBA-co-MAA) and are obtained by electrospinning. Zinc and copper ions are introduced onto the fiber surface by coordinating with carboxyls of MAA. After that, sulfide ions are incorporated to react with zinc and copper ions by a hydrothermal synthesis. Thus, copper-doped ZnS particles of around 100 nm in average size, are obtained and well loaded on the fiber surface. The absorption of copper-doped ZnS/HFBA-co-MAA fiber composites is at 262 nm and 326 within the ultraviolet light region. It was found that the average rate of H₂ evolution of copper-doped ZnS powders slightly decreased, while the average rate of H₂ evolution of copper-doped ZnS/HFBA-co-MAA fiber composites increased from the first to the third run. The average rate of H₂ evolution using the copper-doped ZnS/HFBA-co-MAA fiber composites as the catalyst achieved 49.04 mL/h in the third run.

Abstract: Phenol and its derivatives constitutes one of the most dangerous groups of organic chemicals which can cause many environmental and health risks. Therefore removal and degradation of phenol from aqueous solutions is one of the great industrial importance. Ozone is considered to be one of the most effective oxidizing agent for phenol degradation.. The objectives of this study are to examine the roles of added catalyst to rapid the process of phenol degradation by ozone.

Abstract: The effect of steam, fed to the fixed-bed microreactor reactor, on the oxidative dehydrogenation of cyclohexane over Mg₃(VO₄)₂ catalyst was reported. The catalyst characterization results showed that the crystal structure, the electron cloud distributions of the active species and the oxygen species, and the reducibility of the active species are not influence by the introduction of steam. It was observed that steam added to the oxidative dehydrogenation of cyclohexane competes for sites required for gas-phase oxygen activation, which catalyst lattice oxygen utilization is not affected. The shorter residence time and the competition for sites with oxygen causes a decrease in cyclohexane conversion and a corresponding increase in selectivity to cyclohexene.

Abstract: Mesoporous molecular sieve MCM-41 was modified by using 3-mercaptopropyltriethoxysilane as a coupling agent and MCM-41 functionalized with sulfonic acid groups was prepared. The prepared product was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption technique and temperature programmed desorption. The results showed that during the process of modification the frameworks of the molecular sieve were not destroyed, the channel has ordered property. SH group was successfully grafted to the surface of channels of the molecular sieve. The acid amount on the mesoporous material functionalized with sulfonic acid groups reached 0.755mmol/g, showing a potential application foreground as a catalyst.

Abstract: Dodecatungstophosphoric acid was synthesized and used as catalyst for oxidation of benzaldehyde to benzoic acid with aqueous hydrogen peroxide. The effect of various catalytic reaction parameters including time, temperatures, and the amount of catalyst on the yield of benzoic acid was investigated in details. The results indicated that the as-prepared sample was in the keggin-type structure and the optimal parameters under the reaction conditions were as follows: 0.5 g of catalyst, reacted at 80 C for 5 h.

Abstract: Catalytic cracking experiment of recycle oil was carried out in fixed fluidized bed apparatus. The effects of reaction temperature, catalyst to oil ratio and space time on product distributions were investigated. Low conversion of recycle oil was exhibited due to poor cracking performance, moreover, reaction conditions showed obvious influence on gasoline yield.

Abstract: Functionalized catalyst preparation is a new and attractive method for hydrogenation of carbon dioxides. Three kind of carriers were functionalized firstly and then Ru was immobilized on the carriers. Continuous catalytic hydrogenation process was used to evaluate the activity of the catalyst on fixed-bed. It was found that the main production are formic acid and CO at 10MPa, and both the selectivity and recovery of CO are more than 90%, the hydrogen reaction mechanism could be explained with the reversed water gas reaction process. This may offer a new way for the reuse of CO2.

Abstract: This text will lead to a new phase transfer catalyst ultrasonic reaction and affected the condition of benzoic condensation reaction. From this research we found that when the reaction temperature is 60-65 °C, pH is 9.5, ultrasonic time is 70 minutes, benzyltriethylammonium chloride is 0.45g, and the benzoin yield is 68.9%.

Abstract: In this paper, SiMgAl hydotalcite synthesis conditions were investigated using co-precipitation method, within a relatively stable pH environment of 8~9. Our research, analysis and discussion focused on the effects of major factors, such as material molar ratio ,silicon content and aged condition, on the structures of synthetic products. To achieve stable and accurate data, synthetic products were characterized by XRD and IR under the identical conditions. As shown in the results, it is suggested that the best Crystallization temperature is 70°C, molar ratio of Mg to Al is 3:1, and the best content of Silicon is 0.015mol/mol.