Preparation method of mesoporous A-R mixed crystal titanium oxide with controllable rutile content

An A-R, titanium oxide technology, applied in the direction of titanium dioxide, hydrocarbon production from carbon oxides, chemical instruments and methods, etc., can solve the problems of long preparation cycle, shortened reaction time, uneven mass transfer, etc., and achieve simple and easy preparation conditions and processes Controlling, stable loading of active components, and excellent photocatalytic performance

Inactive Publication Date: 2012-08-01
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a long preparation cycle and requires sintering at 600-1100°C, which consumes a lot of energy and affects its application prospects. On this basis, our research group placed the reaction in a humid atmosphere, thereby shortening the reaction time [Patent 200710025816.X]; but there are also shortcomings such as the need to react in a humid atmosphere, high requirements for equipment, and uneven mass transfer
Moreover, the existing process cannot adjust the crystal form of mesoporous titanium oxide by adjusting the acid concentration.

Method used

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  • Preparation method of mesoporous A-R mixed crystal titanium oxide with controllable rutile content

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Anatase titanium oxide and sodium hydroxide are thoroughly mixed (TiO 2 : Na 2 O=0.25), calcined at 300℃ for 2h, use H + The concentration is 10 -0.5 The titanate is cleaned with mol / L nitric acid solution (that is, soaked in alkali metal titanate for 2 hours), and finally calcined in a muffle furnace at 500°C for 4 hours to obtain mesoporous titanium oxide with a maximum pore diameter of 4nm , The specific surface area is 90m 2 / g, the pore volume is 0.2cm 3 / g, the crystal form is rutile titanium oxide, in which the rutile content is 100wt%.

Embodiment 2

[0032] Anatase titanium oxide and sodium hydroxide are thoroughly mixed (TiO 2 : Na 2 O=0.25), calcined at a temperature of 300℃ for 4h, use H + The concentration is 10 -1 The titanate is cleaned with mol / L nitric acid solution (that is, soaked in alkali metal titanate for 3 hours), and finally calcined in a muffle furnace at 300°C for 4 hours to obtain mesoporous titanium oxide with the most probable pore diameter of 2nm , The specific surface area is 150m 2 / g, the pore volume is 0.5cm 3 / g, the crystal form is rutile titanium oxide, in which the rutile content is 100wt%.

Embodiment 3

[0034] Titanic acid and sodium carbonate are mixed thoroughly (TiO 2 : Na 2 O=1), calcined at 500℃ for 0.5h, use H + The concentration is 10 -1.3 The titanate is cleaned with mol / L hydrochloric acid solution (that is, soaked in alkali metal titanate for 5 hours), and finally calcined in a muffle furnace at 550°C for 2 hours to obtain mesoporous titanium oxide. The most probable pore diameter is 40nm, the specific surface area is 60m 2 / g, the pore volume is 0.18cm 3 / g, the crystal form is a mixed crystal structure of anatase and rutile, in which the content of rutile is 45% by weight.

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Abstract

The invention discloses a preparation method of mesoporous A-R mixed crystal titanium oxide with controllable rutile content, which includes that sodium salt and compound containing titanium are mixed and then roasted for 0.2 to 6 hours at high temperature of 100-550 DEG C to obtain alkali metal titanium acid salt; the alkali metal titanium acid salt is washed by using acid solution of different concentration, and finally dehydration processing is performed to obtain the mesoporous A-R mixed crystal titanium oxide with the controllable rutile content, 2-50nm hole diameter, 30-300m<2> / g specific surface area and 0.1-0.5 cm<3> / g hole volume; and the rutile content in a mesoporous A-R mixed crystal titanium oxide product is regulated by adjusting concentration of the acid solution adopted for washing the alkali metal titanium acid salt. The mesoporous A-R mixed crystal titanium oxide with the different rutile content can be obtained through regulation of the concentration of the acid solution for washing Na salt, and the mesoporous A-R mixed crystal titanium oxide has the advantages of being stable in supported active components and excellent in photochemical catalysis performance.

Description

Technical field [0001] The invention belongs to the technical field of preparation of inorganic porous catalytic materials, and specifically relates to a method for preparing mesoporous A (anatase titanium oxide)-R (rutile titanium oxide) mixed crystal titanium oxide with controllable rutile content. Background technique [0002] Energy crisis and environmental pollution are the two major challenges facing mankind in the 21st century. Based on the photosynthesis of plants, people have designed a kind of "artificial leaves". It is a system that reduces the greenhouse gas CO 2 As a raw material, with the participation of sunlight, it is converted into CO or CH with higher combustion value 4 Or CH 3 OH, then converted to CO through human activities 2 , Such a cycle can not only solve the environmental problems caused by greenhouse gases, but also provide clean energy for mankind. [0003] Photocatalytic reduction of CO 2 As early as 30 years ago, Professor Fujishima began to try to pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06B01J32/00B01J23/42C07C9/04C07C1/12
Inventor 杨祝红施荣华姚文俊王昌松冀超朱育丹刘畅陆小华
Owner NANJING UNIV OF TECH
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