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Problems and Characteristics of Russian platinum metals Exporters

贵金属 2012年第A1期33卷 284-286页

作者： ANDREEV A. M. KELCHEVSKAYA N. R. JSC "Ekaterinburg non-ferrous metals processing plant" The Urals Federal University by name of the first President of Russia Boris Yeltsin" Ekaterinburg Russia.

The paper revealed the place and role of Russia in the global market of platinum metals, highlighted features of pricing in the export of Russian platinum group metals, the main problems of pricing in the export contracts related to the instability of markets and imperfect currency and customs legislation of the Russian Federation, proposed innovative ways to solutions to existing problems in the preparation and conclusion of export contracts.

关键词： platinum metals Russia pricing export contracts customs duties customs fees customs value stock quotes discount

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Production of Nanopowders of platinum metals Using the Chemical Reduction Method

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贵金属 2012年第A1期33卷 267-268页

作者： PYATAKHINA E. S. BUSLAYEVA T. M. VOLCHKOVA E. V. KHRISTICH E. A. ERGEYEVA T. Yu. OJSC "SIC 'Supermetal'" Moscow Russia Lomonosov Moscow University of Fine Chemical Technology Moscow Russia.

The literary data on the application of various methods for the production of nanopowders of platinum metals and alloys have been summarized, and the selection of the method of chemical reduction from salt solutions has been substantiated as the simplest and most affordable. The optimum conditions for the production of nanoparticles of metal palladium and platinum/cobalt alloy, using the effect of boranes with various structures, have been selected.

关键词： platinum metals powders double complex salts reduction boranes

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Catalytic oxidation of CO over Pt/Fe3O4 catalysts:Tuning O2 activation and CO adsorption

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 115-123页

作者： Zihao Li Yang Geng Lei Ma Xiaoyin Chen Junhua Li Huazhen Chang Johannes W.Schwank Department of Chemical Engineering University of MichiganAnn ArborMI 48109USA School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Environment Tsinghua UniversityBeijing 100084China School of Environment and Natural Resources Renmin University of ChinaBeijing 100872China

The self-inhibition behavior due to CO poisoning on Pt metal particles strongly impairs the performance of CO *** is an effective method to use reducible metal oxides for supporting Pt metal particles to avoid self-inhibition and to improve catalytic *** this work,we used in situ reductions of chloroplatinic acid on commercial Fe3O4 powder to prepare heterogeneousstructured Pt/Fe3O4 catalysts in the solution of ethylene *** heterogeneous Pt/Fe3O4 catalysts achieved a better catalytic performance of CO oxidation compared with the Fe3O4 *** temperatures of 50%and 90%CO conversion were achieved above 260℃and 290℃at Pt/Fe3O4,***,they are accomplished on Fe3O4 at temperatures higher than 310℃.XRD,XPS,and H2-TPR results confirmed that the metallic Pt atoms have a strong synergistic interaction with the Fe3O4 *** results and transient DRIFTS results proved that the Pt metal particles facilitate the release of lattice oxygen and the formation of oxygen vacancies on *** combined results of O2-TPD and DRIFTS indicated that the activation step of oxygen molecules at surface oxygen vacancies could potentially be the rate-determining step of the catalytic CO oxidation at Pt/Fe3O4 *** reaction pathway involves a Pt-assisted Mars-van Krevelen(MvK)mechanism.

关键词： Strong metal-support interaction(SMSI) Surface oxygen vacancy Lattice oxygen Magnetite platinum metals

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Exclusive Jewelry Joits

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贵金属 2012年第A01期33卷 263-266页

作者： POGREBISKY David Jerusalem Israel

There are shown the wide possibilities of combined micro plasma welding methods. They permit, for example, to do the local surfacing without essential deformations of rather thin jewelry elements, including a big growth a rise or layer of metal which exceeds it thickness in 2~8 times at the space with the approximately the same sizes. Such opportunities are based on the various possibilities of the joint producing-with different participation of metal parts and filler material. It may be added as a standard paste, wire, strip, etc. An operator can easy choose-where it is reasonable to apply only welding or brazing process as well as their combinations-due to his qualification, the concrete jewelry good design, needed accuracy of the given joint adjustment and, of course, the operators fantasy. At the same time he has excellentchances to repair the spoiled jewelry good or its element. All these processes are very easy for realization and theymay be even made by beginners and not only in jewelry, but also forrepairing of copper tubes, brass heat exchangers, various bronze goods, in dental purposes.

关键词： joining in jewelry micro plasma welding micro brazing combined micro plasma processes noble metals joining goldspecimen welding platinum metals copper tubes repair

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