Papers by Keyword: Catalysis

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Authors: T. V. Shakieva, V.S. Yemelyanova, Zh.K. Kairbekov, E. M. Shakiev, Zh. K. Myltykbaeva
Abstract: The results of research of kinetic of oxidations of phenol by oxygen at presence of nitrogen oxides and complexes of cobalt fixed on polyacrylic acid at 333К are presented in the article. It is established, that at presence of complexes of cobalt fixed on PAA and oxides of nitrogen it is possible to spend oxidation of phenol in soft conditions. Fixation of mononuclear complexes on polyacrylic acid promotes destruction of an aromatic ring, getting of aliphatic aldehydes and ketones while at presence of binuclear complexes of cobalt fixed on PAA process of oxidation comes to an end with formation benzoquinone. The given system works stably.
Authors: Yang Yuan, Zhuo Chen, Hao Li Qin, Zhao Wu Han
Abstract: The lignite resource is rich in Xilingol League in Inner Mongolia. The two new methods were achieved to preparation activated carbon which used lignite as raw material. Firstly, the lignite was acidized by hydrochloric acid to prepare activated carbon. The catalytic materials in the ash as calcium, magnesium, iron and other elements were significantly reduced after that and the activated speed of the coal was significantly lower than the original coal, which are conducive to the development of uniform porous carbonized compound and decrease the hole broken. And a better surface area and adsorption properties of activated carbon was obtained. Secondly, with the carbonization and activation temperature at 800°C and 45 min, we can get the activated carbon with the excellent adsorption performance through fluidized catalysis of lignite.
Authors: Shu Lan Cai, Fa Mei Feng, Tao Wang, Xiu Lan Zhang
Abstract: The catalytic hydrolysis of Bis(p-nitrophenyl) phosphate ester (BNPP) in the metallomicelle made up of Ce3+-diethylenetriamine and LSS (N-lauroyl sarcosinate) was investigated by UV/VIS method. The effect of the catalytic efficiency and stability of the system was studied under the different conditions. The results indicated that the catalytic system exhibited high activity, stability and reproducibility in the BNPP catalytic hydrolysis under proper proportion of Ce3+ ion and diethylenetriamine, pH and temperature when the concentration of LSS is higher than its CMC (critical micelle concentration). The results also showed that the active species is the complex made up of Ce3+ ion and diethylenetriamine.
Authors: Aubakirov Ermek, Tashmuhambetova Zheneta, Kairbekov Zhaksuntay, Burkhanbekov Kairat
Abstract: This paper represents the results of researching of recycling plastic wastes by hydrogenation in the presence of catalysts: natural zeolite, bauxite, red sludge (wastes from recycling of bauxite), as a hydrogen source was used heavy residues from oil process. This method allowed to define the optimal conditions of the hydrogenation process and get liquid products enriched with isoalkanes, cycloalkanes, aromatic and heteroaromatic hydrocarbons.
Authors: Shen Yong Li, Shui Yu Sun, Jing Yong Liu, Jia Qi Wu, Jia Jun Zeng
Abstract: Pyrolysis appears to be a promising route allowing all-components recovery of the high value of potentially accessible products from waste printed circuit boards (WPCBs). However, bromine-containing pyrolysis oil must be dehalogenation, otherwise it will be a strong impact on thermal treatment. In the present study, an effective and environmental-friendly process using tri-iron tetroxide sorbent (Fe-O) to simultaneously degrade brominated epoxy resin from WPCBs was developed in pyrolysis process. The results show that brominated epoxy resins can be quickly decomposed under catalysis condition. Bromide concentration in pyrolysis oil decreases with the increase of the content of Fe-O. It can transfer the bromine from the gas phase and liquid phase to solid phase. When adding proportion to 1:1, bromine concentration of pyrolysis oil decreased by up to 98.2%. Fe-O can promote the decomposition of complex structure of benzene compounds to substance with simple structure. This study produces halogen free liquid products to recycle.
Authors: Latika Menon
Abstract: Titania (or titanium dioxide) nanotubes are advanced materials with diverse functionalities. They have a variety of applications ranging from biology, food, cosmetics, energy and related areas. In this paper, we provide a brief description of electrochemical routes that may be used to synthesize such nanotubes rapidly over large areas. We also provide a brief overview of their energy-related.
Authors: Chun Hua Wu, Qian Rong Zhao, Jia Yan Zhang, Dan Dan Zhu, Guan Ben Du
Abstract: Nanometer composite S2O82-/SnO2-TiO2, a novel solid superacid, was prepared by the sol-gel method and its structure was characterized by XRD, TEM, FT-IR and nitrogen adsorption. Results indicated that the composite S2O82-/SnO2-TiO2 had a narrow particle size distribution with an average particle diameter about 15~20nm. S2O82- combined with SnO2-TiO2 resulted in formation of strong acid sites on the surfaces. The surface area of catalysts obviously increased after incorporating SnO2. Nanometer S2O82-/ SnO2-TiO2 composite was used as a catalyst for a-pinene isomerization and the influence of catalyst preparation conditions on its performances were investigated. The optimum condition for superacid catalyst preparation was found to be with 2:1 Sn/Ti mole ratio, S2O82- 1 mol · L-1 of impregnation consideration and toasting temperature of 773K. With 3% of S2O82-/SnO2- TiO2 catalyst dosage at a reaction temperature at 403K for 2 h, the conversion of a-pinene was 98 % and the selectivity to camphene was 62 %.
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