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A catalyst regeneration method

A technology for catalysts and denitration catalysts, which can be used in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems of high cost and difficult implementation.

Active Publication Date: 2016-05-18
耘太环保科技(山东)股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current catalyst regeneration method is expensive and difficult to implement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A regeneration method for a selective catalytic reduction (SCR) denitrification catalyst, comprising the following steps in sequence according to the production process: (1) using 0.35MPa steam at a temperature of 250°C to physically purge the spent catalyst; (2) using 0.5wt % hydrochloric acid solution to soak the catalyst for 24 hours; (3) use hot water to clean the catalyst; (4) use a mixed solution containing vanadium pentoxide (V2O5) and tungsten oxide (WO3) and titanium dioxide to coat the catalyst, The mixed solution contains 17wt% of vanadium pentoxide, 7wt% of tungsten oxide, and 70wt% of titanium dioxide; (5) calcining at 420° C. for 48 hours.

Embodiment 2

[0021] Repeat embodiment 1, just the pressure of steam in step (1) is 0.25MPa, and temperature is 300 ℃; In step (2), use the ammoniacal solution soaking catalyst of 0.5wt%; Contain 7wt% in the mixed solution of step (4) vanadium pentoxide, 9wt% tungsten oxide, and 70wt% titanium dioxide; in step (5), the calcination temperature is 450° C. and the time is 60 hours.

Embodiment 3

[0023] Repeat embodiment 2, just the temperature of steam is 280 DEG C in the step (1); The hot water in the step (3) is the deionized water of 50 DEG C; Contain the vanadium pentoxide of 15wt% in the mixed solution of the step (4) , 8wt% tungsten oxide and 70wt% titanium dioxide.

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PUM

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Abstract

The invention relates to a method for recycling a denitration catalyst. The method sequentially comprises the following steps according to production procedures: (1) blowing a waste catalyst by using steam; (2) soaking the catalyst by using an acidic solution or an alkaline solution; (3) cleaning the catalyst by using hot water; (4) coating the catalyst by using a mixed solution which contains vanadic oxide (V2O5), tungsten oxide (WO3) and titanium dioxide; and (5) calcining. According to the method, the denitration efficiency of the catalyst can be restored to 70%-90% of original denitration efficiency after the catalyst is recycled. The method disclosed by the invention has the advantages of short working period, easiness and convenience in operation, low cost and great economic benefit and social benefit.

Description

technical field [0001] The invention relates to a catalyst regeneration method, in particular to a regeneration method of a denitration catalyst. Background technique [0002] Denitration catalysts remove or purify nitrogen oxides (NOx) in exhaust gases generated by vehicles, thermal power plants, or chemical plants. It is inevitable that the activity of the catalyst will be reduced or even deactivated with the increase of service time. For catalysts that have lost their activity, they can be regenerated or renewed. There are many ways to regenerate the catalyst. The simple method is to carry out physical soot blowing treatment. Further, the catalyst can be chemically cleaned and soaked according to the situation. In serious cases, the catalyst surface coating should be regenerated. The current catalyst regeneration method is expensive and difficult to implement. Contents of the invention [0003] In order to achieve the above purpose, the present invention regenerates ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/00B01J38/68
Inventor 史红华
Owner 耘太环保科技(山东)股份有限公司
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