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Titanium dioxide doped with fluorine and its preparation method

A technology of titanium dioxide and nitrogen oxides, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, secondary batteries, etc., to achieve the effect of long service life

Active Publication Date: 2016-03-02
BRETON SPA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although superior to perfluorinated copolymers in many respects, none of these materials are currently realizing their full potential and much research effort is still required

Method used

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  • Titanium dioxide doped with fluorine and its preparation method
  • Titanium dioxide doped with fluorine and its preparation method
  • Titanium dioxide doped with fluorine and its preparation method

Examples

Experimental program
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Embodiment

[0087] Example (a): Fluorine-doped TiO 2 (FT) Preparation

[0088] Mix 7 liters of water, 3kg of NH 4 HF 2 Salt and 1341 g of ilmenite sand sieved to a particle size of less than 200 microns were placed in a stirred reactor having a volume of about 10 liters. The mixture was then boiled at atmospheric pressure and kept boiling for about 1 hour. After this step of reacting with the ore, 4 liters of solution were discharged through a valve in the bottom of the reactor and then filtered. 1.5 liters of a 30% concentrated ammonia solution was added to the thermostat-controlled solution containing titanium fluoride and iron fluoride salts at 70° C. thus filtered to raise its pH to 7.3. The white precipitate was isolated by filtration and an additional 2 liters of 30% concentrated ammonia solution in water was added to the filtrate to obtain a pH of about 9.5. The white precipitate was isolated by filtration and subjected to a subsequent pyrohydrolysis step. About 30 g of this ...

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Abstract

Crystalline titanium dioxide containing fluorine atoms within a lattice comprising titanium atoms and oxygen atoms is described; this titanium dioxide is well suited for the production of composite membranes for solid-state electrolytes, fuel cells or electrolytic cells. The aforementioned titanium dioxide can be produced by a process comprising the following steps: (a) reacting titanium ore with NH4HF2 aqueous solution; (b) filtering the aqueous dispersion thus obtained, followed by separation of the solid residue and the aqueous solution containing the titanium salt (c) the aqueous solution thus obtained undergoes hydrolysis comprising a first step at pH 6.5-8.0 and a second step at pH 9-11; (d) the aqueous dispersion thus obtained is filtered and the solid residue is in Pyrohydrolysis is carried out at a maximum temperature of about 500°C, preferably about 450°C.

Description

technical field [0001] The present invention relates to fluorine-doped titanium dioxide (TiO 2 ); this titanium dioxide can be advantageously used in the production of inorganic and / or organic hybrid membranes. The resulting membranes are characterized by better proton conductivity and mechanical properties than those exhibited by similar systems not containing doped titania. Furthermore, in PEMFC fuel cells, the proton conductivity and performance of some of the resulting inorganic / organic composite membranes are less impaired by dehydration than similar systems that do not contain doped titania. It can also be used in the production of solid electrolytes. Background technique [0002] A fuel cell is a device that directly converts chemical energy of reactants supplied thereinto electrical energy. Fuel cells are well known in the art and are described, for example, in Cappadonia et al. in Ullmann's Encyclopedia of Industrial Chemistry, Fuel Cells, 2005, 1-23, Wiley-VCH, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047C01G23/053H01M4/90
CPCC01G23/047C01G23/053C01P2002/54C01P2004/04C01P2004/61C01P2004/62C01P2006/40H01M8/1023H01M8/1039H01M8/1048H01M8/1051H01M10/052H01M10/0562H01M2008/1095H01M2300/0071H01M2300/0082H01M2300/0091Y02E60/10Y02E60/50Y10T428/2982Y02P70/50H01M4/90
Inventor 莫罗·贝蒂奥尔法比奥·巴塞托
Owner BRETON SPA
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