Über das Verhalten von Metalloxyden und Silicaten im Chlorstrom

Wasmuht, Roland

doi:10.1002/ange.19300430604

Angewandte Chemie

1930

DOI: 10.1002/ange.19300430604

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Über das Verhalten von Metalloxyden und Silicaten im Chlorstrom

Roland Wasmuht¹

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1931

2008

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Cited by 4 publications

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“…Little previous work has been done. According to Moissan (6), Cr20~ gives CrCl~ with dry C12 and CRO2C12 with wet C12 at 440~ Wasmuht (7) has found that the weight loss of Cr203 after 1 hr of chlorination at 800~ is 6.6% (no data about flow rate and chlorine pressure). If carbon is present, the reaction between Cr203 and C12 starts at lower temperatures giving CrC13 (8).…”

mentioning

confidence: 99%

High Temperature Corrosion of Chromium and Chromium (III) Oxide in Chlorine and Chlorine‐Oxygen Mixtures

Reinhold

Häuffe

1977

J. Electrochem. Soc.

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The chlorination kinetics of Cr between 650° and 800°C is characterized by a time‐constant weight loss of the specimen caused by volatilization of CrCl3 and CrCl4 . At low Cl2 pressures also a scale is formed consisting of CrCl2 and CrCl3 . The rate‐determining step is the diffusion of volatile products across the laminar boundary layer. Cr2O3 pellets show time‐constant weight loss in Cl2 and Cl2‐O2 mixtures. In the mixtures, the rate constant of the corrosion of Cr2O3 is about a hundred times smaller compared to the chlorination of Cr in the absence of O2 . It increases with the fourth root of the O2 pressure and linearly with the Cl2 pressure indicating that CrO2Cl2 seems to be the only reaction product. In a mixture of Cl2 and O2 , the corrosion of Cr is inhibited due to formation of an outer Cr2O3 layer and of CrO2Cl2 as the only volatile product. Since Cr2O3 can be volatilized as described above, preoxidized samples of Cr exhibit no long‐time corrosion resistance in Cl2 .

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mentioning

confidence: 99%

High Temperature Corrosion of Chromium and Chromium (III) Oxide in Chlorine and Chlorine‐Oxygen Mixtures

Reinhold

Häuffe

1977

J. Electrochem. Soc.

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Direct Formation of Element Chlorides from the Corresponding Element Oxides through Microwave‐Assisted Carbohydrochlorination Reactions

Nordschild¹,

Auner²

2008

Chemistry A European J

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A series of technically and economically important element chlorides-such as SiCl4, BCl3, AlCl3, FeCl2, PCl3 and TiCl4-was synthesized through reactions between hydrogen chloride and the corresponding element oxides in the presence of different carbon sources with microwave assistance. This process route was optimized for demonstration purposes for tetrachlorosilane formation and successfully demonstrates the broad applicability of various silicon oxide-containing minerals and materials for carbohydrochlorination. The chlorination reaction occurs at lower temperatures than with conventional heating in a tubular oven, with substantially shorter reaction times and in better yields: quantitatively in the case of tetrachlorosilane, based on the silicon content of the starting material. The experimental procedure is very simple and provides basic information about the suitability of element compounds, especially element oxides, for carbohydrochlorination. According to the general reaction sequence element oxide-->element-->element chloride used in today's technology, this one-step carbohydrochlorination with hydrogen chloride is considerably more efficient, particularly in terms of energy input and reaction times, avoiding the isolation of the pure elements required for chlorination to give the element chlorides with use of the more corrosive and toxic chlorine gas.

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Über Pterinchemie. 90. Mitteilung. Synthese und Kristallstruktur des ersten chinoiden Dihydropterinmolybdän (IV)‐Komplexes

Fischer

Strähle

Viscoittinf

1991

Helvetica Chimica Acta

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Synthesis and Crystal Structure of the First Quinoid Dihydropterinmolybdenum(1V) ComplexThe first molybdenum(1V) complex with a quinoid dihydropterin, i.e. 2, was isolated and characterized by IR, UV and NMR data and single-crystal X-ray diffraction. The reaction of MoV'02CI, with the biologically important 6B-5,6,7,8-tetrahydro-~-biopterin') (7) in MeOH gave almost quantitatively trichloro(l,5-quinoid-7,8dihydro-6H-~-biopterin)oxomolybdenum(IV) (2). The complex crystallizes with one molecule of MeOH in the noncentrosymmetric orthorhombic space group P2,2,2, (No. 19) with unit cell dimensions a = 1009.3(3), h = 1104.7(3), and c = 1484.5(4) pm and Z = 4. The Mo-atom has a distorted octahedral geometry (Fig. 1). It is coordinated by N(5) and O(4) of the pterin ligand. The distance of the Mo-N(5) bond (202 pm) is unusually short compared to similar complexes. O(4) is located trans to a terminal 0x0 ligand. The octahedral coordination is completed by three C1-atoms in a meridional arrangement. Complex 2, with the Mo-atom in the enzyme-relevant oxidation state +1V and the pterin in the intermediate quinoid dihydro form, should lead to an extension of the proposed 'common molybdenum cofactor' model.

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Über das Verhalten von Metalloxyden und Silicaten im Chlorstrom

Cited by 4 publications

References 2 publications

High Temperature Corrosion of Chromium and Chromium (III) Oxide in Chlorine and Chlorine‐Oxygen Mixtures

High Temperature Corrosion of Chromium and Chromium (III) Oxide in Chlorine and Chlorine‐Oxygen Mixtures

Direct Formation of Element Chlorides from the Corresponding Element Oxides through Microwave‐Assisted Carbohydrochlorination Reactions

Über Pterinchemie. 90. Mitteilung. Synthese und Kristallstruktur des ersten chinoiden Dihydropterinmolybdän (IV)‐Komplexes

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