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Synthesis of cerium-doped MCM-48 molecular sieves and its catalytic performance for selective oxidation of cyclohexane WANG Yunsong1,ZHAN Wangcheng1,GUO Yun1,GUO Yanglong1,WANG Yanqin1,ZHANG... or 0.059), there were CeO2 crystallites as secondary phase in the extraframework of MCM-48. Ce-doped MCM-48 was a very efficient catalyst for the oxidation of cyclohexane in a solvent-free system......
to oxidation compared with the nickel-rich region appearing in the total film thickness[19]. Furthermore, according to XRD and Raman analyses, Co3O4 spinel phase only forms on Ni-30%Co coating after oxidation... produced by adjusting the composition of the plating solution using a direct current electrodepositing process. The oxidation behaviors of nickel and nickel-cobalt alloys in air at 960 °C were studied......
Effects of cathodic component of current on porosity and hardness characteristics of micro plasma oxidation(MPO) coatings on aluminum alloy Samir Hamid Awad, QIAN Han-cheng(钱翰城) (School of Mechanical Engineering, Chongqing University, Chongqing 400044, China) Abstract: Micro plasma oxidation(MPO) has recently been investigated as a novel, rapid and effective means to provide modified......
45A钢方坯夹杂物行为研究翟俊1,吴巍1,吴伟1,周远华2,熊银成2,胡兵2(1.北京市钢铁研究总院冶金工艺研究所2.重庆钢铁股份有限公司,重庆 400084)摘 要:为了了解45A钢铸坯夹杂物行为,利用显微镜,电子探针和大样电解等分析方法对45A钢铸坯中夹杂物分布,数量和种类做了分析.结果表明:铸坯夹杂物整体控制水平较好,其中铸坯夹杂物指数平均为22.2个/mm2,铸坯中心夹杂物指数为25.8个/mm2;铸坯大样电解结果表明大型夹杂物总量平均为2.23 mg/(10 kg),夹杂物直径都大于300μm;大型夹......
, in the vicinity of slag heap and arable soils near the outlet of sewer channel, and unpolluted site 5 km away from one ferroalloy plant in Hunan Province, China, were selected. The concentrations of total Cr and water soluble Cr in bulk soil samples and profile depth samples were determined. The results show that the soils in the vicinity of slag heap have the highest total Cr content followed......
J. Cent. South Univ. (2019) 26: 2822-2832 DOI: https://doi.org/10.1007/s11771-019-4216-2 Improved hyper-spherical search algorithm for voltage total harmonic distortion minimization in 27-level... quality. In this paper, a 27-level inverter switching algorithm considering total harmonic distortion (THD) minimization is investigated. Switching angles of the inverter switches are achieved......
Structure and tensile/wear properties of microarc oxidation ceramic coatings on aluminium alloy WEI Tong-bo(魏同波), YAN Feng-yuan(阎逢元), LIU Wei-min(刘维民), TIAN Jun(田 军) (State Key Laboratory... oxidation in alkali-silicate electrolytic solution. The thickness and microhardness of the oxide coatings were measured. The influence of current density on the growth rate of the coating......
Oxidation behavior of multiphase Mo5SiB2 (T2)-based alloys at high temperatures WANG Fang(王 方), SHAN Ai-dang(单爱党), DONG Xian-ping(董显平), WU Jian-sheng(吴建生) Key Laboratory of Ministry... (T2)-based alloys with nominal compositions of Mo-12.5Si-25B and Mo-14Si-28B (molar fraction, %) were prepared in an arc-melting furnace, and their oxidation kinetics from 1 000 to 1 300 ℃ were studied......
that when the pressure oxidation lasts for 1.5 h, the total sulfur content reduces and the oxidation ratio of sulfur increases with the increased liquid-to-solid ratio, while pH value of the solution..., the oxidation ratio of sulfur keeps constant. However, the higher content of total sulfur and lower content of sulfate in the residue are observed at 2 h reaction time. It can be deduced......
perovskite structure were prepared, and the series of La0.9RE0.1MnO3 catalysts were studied experimentally. The so prepared ultra-fine particles exhibites high catalytic activity for CH4 total oxidation... stable, and La0.9Y0.1MnO3 or La0.9Gd0.1MnO3 (varies with calcination temperature) exhibits the highest catalytic activity for total oxidation of methane. The specific surface area of La0.9Y0.1MnO3......