Titanium dioxide catalytic ozonation catalyst as well preparation and denitration application

A technology of titanium dioxide and black titanium dioxide, which is applied in the direction of titanium oxide/hydroxide, titanium dioxide, physical/chemical process catalysts, etc., can solve the problems of increasing operating costs and depleting ozone, and achieves the effect of cheap preparation costs

Active Publication Date: 2018-03-27
NANJING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

The current general catalysts used in catalytic ozonation and denitrification still consume a large amount of ozone, thus increasing the operating cost

Method used

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  • Titanium dioxide catalytic ozonation catalyst as well preparation and denitration application
  • Titanium dioxide catalytic ozonation catalyst as well preparation and denitration application
  • Titanium dioxide catalytic ozonation catalyst as well preparation and denitration application

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Embodiment Construction

[0031] The present invention will be further elaborated below in conjunction with examples.

[0032] First, 28 ml of butyl phthalate and 2 g of urea were dissolved in 80 ml of absolute ethanol, and the resulting mixture was stirred at room temperature for 30 minutes to obtain solution A. Secondly, 2ml of hydrochloric acid and 10ml of water were dissolved in 20ml of absolute ethanol to obtain solution B. Then, the solution B was added to the solution A, and the mixture was continuously stirred until it became a white sol, and then heated in a water bath at 35°C for 30 minutes, and the resulting mixture was allowed to stand for 24 hours. The obtained sol was dried at 120° C., and finally calcined at 500° C. for 3 hours with a heating rate of 4° C. / min to obtain black titanium dioxide.

[0033] figure 1 The XRD pattern of the catalyst shows that the black titanium dioxide is anatase component. figure 2 , 3 , 4 are the solid UV, Raman and NH of the catalyst respectively 3 -TPD charac...

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Abstract

The invention discloses a black titanium dioxide catalytic ozonation catalyst which is prepared by calcining under an oxygen deficient condition. Compared with commercial titanium dioxide, the catalyst is calcined under the oxygen deficient condition, so that the catalyst has relatively more black oxygen vacancies. The hydroxyl adsorption is facilitated by the oxygen vacancies; hydroxyl on the oxygen vacancies is good for recombination of ozone to generate free radicals capable of directly oxidizing NO into nitric acid, so that the conversion rate of the NO in catalytic ozonation denitration is improved; the NO has low water solubility so that alkali is not easy to absorb. By adopting the black titanium dioxide catalytic ozonation catalyst disclosed by the invention, the problems in a catalytic ozonation denitration process that the consumption amount of the ozone is too great and the operation cost is high are solved; the black titanium dioxide catalytic ozonation catalyst is suitablefor middle-size and small-size coal-fired boilers in catalytic ozonation treatment.

Description

Technical field [0001] The invention relates to the preparation and application of a catalytic ozonation catalyst, in particular to the application of denitration of flue gas at medium and low temperature under the requirement of low ozone consumption. Background technique [0002] At present, industrial coal-fired boilers emit a large amount of flue gas, which contains a large amount of nitrogen oxides, which is one of the main causes of acid rain, photochemical pollution and other environmental problems. Environmental issues have attracted widespread attention in recent years, NO X Emission standards with NO X As the treatment technology continues to improve and become more stringent, the industrial equipment that is in operation is also in urgent need of denitration transformation. For small and medium-sized coal-fired units, denitrification is a project with high investment and low return, which brings considerable economic pressure to the enterprise. Moreover, it is not poss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C01G23/047B01D53/86B01D53/56
CPCB01D53/8628B01D2251/104B01D2255/20707B01D2258/0283B01J21/063C01G23/047
Inventor 钟秦韩晨阳张舒乐
Owner NANJING UNIV OF SCI & TECH
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