Advanced Materials Research Vols. 396-398

Abstract: The CdS/CNTs nanocomposites were prepared by a simple heating refluxing method, and the scattering of CdS on CNTs surface was controlled by a dropping way. The samples were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscope (UV-Vis) .The photocatalytic activity of the samples was tested in the degradation of Methylene blue dye wasterwater under simulated sunlight with 500w short arc xenon lamp. The results showed that the photocatalytic activity of CdS/CNTs composites was enhanced by controlling CdS scatter on CNTs surface, and the forbidden band width was appropriate lowered when CNTs was added, and the scatter of CdS on CNTs surface was uniform and the photocata-lytic activity was the highest when the mass ration of CdS with CNTs was 4:1.The CdS composites have good stability and potential industrial application.

Abstract: Advanced Oxidation Processes (AOPs) is a promising treatment technology for eliminating trace micropollutants, in the treatment of wastewaters containing sulfamerazine (one of pharmaceuticals) using O3 and UV/TiO2 process, respectively. The degradation was studied by monitoring the intermediates employing high performance liquid chromatography (HPLC) separation coupled with an atmospheric pressure ionization mass spectrometry (API-MS) system operated under selected ion monitoring (SIM). The results indicate that the original sulfamerazine almost was degraded within 90 min under the concentration of ozone 3 mg/L at different pH runs. The ozonation of sulfamerazine demonstrated the best degradation efficiency for runs at pH 8 than for runs at pH 6 and pH 11, respectively, under the concentration of ozone 1 or 3 mg/L. The original sulfamerazine was completely degraded within irradiation time of 5 hr at pH 6 runs in the concentration of O2-sparged 30 mg/L during the photocatalytic process. The rate constants are 0.086, 0.08, 0.04, and 0.027 hr-1 at the concentration of sulfamerazine 14.22, 21.33, 35.55, and 42.66 μM, respectively. Two intermediates were observed during the photocatalytic degradation of sulfamerazine.

Abstract: Catalyst Cu/Ti-PILCs were used for selective catalytic reduction of NO by propylene. The effect of calcinations temperature of Cu/PILCs on catalytic activity, pore structure and active species were investigated. Cu/Ti-PILCs calcined at 500°C had best activity. On 500°C-calcined catalyst, the Cu species was highly-dispersed and existed mainly as Cu2＋species which was the catalytic active component to SCR reaction. The pore structure of Cu/Ti-PILCs had good thermal stability below 600°C calcinations. 700°C-calcined catalyst has poor catalytic activity. High-temperature calcinations destroyed the catalyst’s pore structure, and formed CuO bulky aggregation which had no catalytic activity, all these led to the decrease of the SBET of catalysts and the drop of catalytic activity.

Abstract: The preparation of Mo–Fe/SiO₂ catalysts by sol-gel method, catalytic selective oxidations of p-xylene to terephthalaldehyde over the Mo–Fe/SiO₂ catalyst, and the effects of the supported metal on the catalytic activities were investigated. The catalysts were characterized by thermal analysis, X-ray diffraction, and Fourier transform infrared spectroscopy. Results show that the presence of Fe enhances the catalytic performance of Mo–Fe/SiO₂ on the selective oxidation of p-xylene. The addition of the optimal concentration of 15% Fe results in 53.2% conversion and 33.3% selectivity. The optimal calcination temperature of the Mo–Fe/SiO₂ catalyst was 500 °C.

Abstract: Liquidus temperature, electrical conductivity and phase composition of Al2O3－CaO－SiO2－CaF2 System were studied. The results showed that the liquidus temperature of the slag decreased with increasing CaF2 content, and its electrical conductivity increased with increasing CaF2 content and temperature. When the content of CaF2 is 20%, the liquidus temperature is 1469°C. When the contents of CaF2 is 10%，its main phase compositions are composed of Ca5Al6O14、Al2Ca3(SiO4)3、Al2(SiF6)3 and Ca3Al10O18. Ca2AlF7、Ca2Al3O6F becomes more and more with increasing the content CaF2 because of F1- replacing O2- in molten slag.

Abstract: A series of V₂O₅/TiO₂ catalysts were prepared by wet impregnation, and these prepared catalysts were characterized by XRD, N2 adsorption-desorption, H2-TPR, and TEM techniques and used in the selective ammoxidation of 3-picoline to 3-cyanopyridine. The effects of TiO2 supports on the catalytic properties of the resulting catalysts for the ammoxidation of 3-picoline to 3-cyanopyridine were investigated in detail. It is found that the V5+/V4+ transformation during ammoxidation is more favorable than the V5+/V3+ transformation for the selective ammoxidation of 3-picoline to 3-cyanopyridine. The V₂O5/TiO₂ catalysts prepared from the nanosized TiO₂ particles as supports show a high activity for the direct oxidation of 3-picoline by air, resulting Subscript text Subscript textin a low selectivity for 3-cyanopyridine. This could be due to the fact that the active species vanadium oxides could be only supported on the external surface of the nano-sized TiO₂ particles with very minor contact area, leading to the weak interactions between active species and support.

Abstract: Effect of ultrasonic waves, premonitory LixMoS2 and La/Ni-MoS2 composites were prepared by n-butyl lithium intercalating in the MoS2 layers, using the single-molecular-layer exfoliated-restacked technology. The effect of catalyst on the performance was investigated with catalytic hydrogenation of sulfolene over composites as probe reaction. The catalyst evaluation results show that the optimum atomic ratio, hydrogen pressure and reactive temperature were n(La):n(Ni) = 0.05, 2.5 MPa and 60 °C, respectively. Under such condition, conversion of sulfolene was 99.8%, the yield of sulfolane reached 95.5%.

Abstract: In this paper, it studies a new cleaning agent for post CMP pattern wafers. The polyamine chelating agent R(NH2)n complexing agent is used in pattern post-CMP cleaning, and the inhibitor BTA can effectively protect the wafer. The surfactant should be appropriate, and the concentration should be 1.5 ‰.

Abstract: Catalytic hydrocracking of asphaltene over Ni-Mo/γ-Al2O3 was conducted in a microbatch reactor at 693 K. A kinetic model with four lumps (asphaltene, liquid, gas and coke) containing five reaction paths was developed. The fitting of experimental data validated the suggested model and determined the rate constant of each individual reactions, to give the insight to the kinetic feature of asphaltene catalytic hydrocracking

Abstract: Pea meal was used as raw material to prepare protein foam agent. The parameters containing concentration of Ca(OH)2, reaction temperature and time were investigated and optimized by the response surface methodology in the modification process of foam agent. The optimum condition was obtained that the concentration of Ca(OH)2 0.78%, reaction temperature 92°C and 4 hours for extraction time. Under the optimal condition, the maximum forecasting foam stability was 16.2h and the verified value was 16.16h which relative error was 0.25% through confirmative test.