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Method for preparing denitration catalyst from discarded vanadium and titanium based denitration catalyst

A denitration catalyst, a vanadium-titanium-based technology, applied in the field of denitration catalysts, can solve the problems of short life, poor denitration catalyst activity, low catalytic efficiency, etc., and achieve the effect of realizing reuse, realizing recyclable utilization, and reducing environmental pollution.

Inactive Publication Date: 2016-09-28
上海净球环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the defects of poor activity, low catalytic efficiency and short service life of the denitrification catalyst prepared from the active components recovered from the existing waste denitrification catalyst

Method used

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  • Method for preparing denitration catalyst from discarded vanadium and titanium based denitration catalyst
  • Method for preparing denitration catalyst from discarded vanadium and titanium based denitration catalyst
  • Method for preparing denitration catalyst from discarded vanadium and titanium based denitration catalyst

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Embodiment 1

[0067] A method for preparing a denitration catalyst from waste vanadium-titanium-based denitration catalyst (it is a denitration catalyst discarded after a coal-fired power plant boiler has been used for 27010h), comprising the following steps:

[0068] (1) Preparation of vanadium-titanium-based denitration catalyst powder:

[0069] Preliminarily crush the waste vanadium-titanium-based denitrification catalyst to particles with a diameter of about 2mm, wash it with deionized water just submerged in the catalyst at room temperature to remove dust and floating matter on the surface, wash it with ammonia water (25wt%) for 20h, and then wash it with deionized water to neutrality, then wash with nitric acid solution (8wt%) for 8h, then wash with deionized water to neutrality, finally wash with sodium hydrosulfide solution (12wt%) for 8h, then wash with deionized water to neutrality; then dry at 160°C After calcination at 500° C. for 10 hours, crushing, and jet milling for 8 hours,...

Embodiment 2

[0077] A method for preparing a denitration catalyst from a waste vanadium-titanium-based denitration catalyst (which is a denitration catalyst discarded after a coal-fired power plant boiler has been used for 26880 hours), comprising the following steps:

[0078] (1) Preparation of vanadium-titanium-based denitration catalyst powder:

[0079] Preliminarily crush the waste vanadium-titanium-based denitrification catalyst to particles with a diameter of about 2mm, wash it with deionized water just submerged in the catalyst at room temperature to remove dust and floating matter on the surface, wash it with ammonia water (20wt%) for 15 hours, and then wash it with deionized water to neutrality, then wash with nitric acid solution (10wt%) for 10h, then wash with deionized water to neutrality, finally wash with sodium hydrogensulfide solution (10wt%) for 7h, then wash with deionized water to neutrality; then dry at 150°C After 9 hours, calcination at 550° C. for 12 hours, crushing,...

Embodiment 3

[0087] A method for preparing a denitration catalyst from a waste vanadium-titanium-based denitration catalyst (which is a denitration catalyst discarded after a coal-fired power plant boiler has been used for 26500h), comprising the following steps:

[0088] (1) Preparation of vanadium-titanium-based denitration catalyst powder:

[0089] Preliminarily crush the waste vanadium-titanium-based denitrification catalyst to particles with a diameter of about 2mm, wash it with deionized water just submerged in the catalyst at room temperature to remove dust and floating matter on the surface, wash it with ammonia water (30wt%) for 8 hours, and then wash it with deionized water to neutrality, then wash with nitric acid solution (4wt%) for 14h, then wash with deionized water to neutrality, finally wash with sodium hydrogensulfide solution (20wt%) for 9h, then wash with deionized water to neutrality; then dry at 120°C After 12 hours, calcination at 450° C. for 14 hours, crushing, and j...

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Abstract

The invention provides a method for preparing a denitration catalyst from a discarded vanadium and titanium based denitration catalyst. The method comprises the steps that 1, the discarded vanadium and titanium based denitration catalyst subjected to primary crushing is cleaned with water, ammonia water, a nitric acid solution and a sodium hydrosulfide solution in sequence, drying, calcining, crushing and gas flow crushing are conducted, and vanadium and titanium based denitration catalyst powder is obtained; 2, the vanadium and titanium based denitration catalyst powder, glass fibers, glycerin, ethylene glycol, carboxymethyl cellulose, stearic acid, cerium dioxide and deionized water are mixed to be uniform, shearing and kneading are conducted through a kneading machine, slurry is obtained and put into a vacuum extruder for extrusion forming, and a honeycomb ceramic green body is obtained; 3, the honeycomb ceramic green body is dried and calcined, and the denitration catalyst is obtained. The catalyst prepared through the method can enable a nitrogen oxide to keep the conversion efficiency of 96% or above at gas reaction temperature ranging from 150 DEG C to 450 DEG C.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, in particular to a method for preparing a denitration catalyst from waste vanadium-titanium-based denitration catalysts. Background technique [0002] Nitrogen oxides are the main pollution source of the atmosphere. It not only causes acid rain, photochemical smog and other problems that damage the earth's ecological environment, but also seriously endangers human health. Therefore, how to effectively remove nitrogen oxides has become an important topic of concern in the field of environmental protection. Ammonia selective catalytic reduction (selective catalytic reduction, SCR) has become the mainstream denitrification technology for fixed sources such as thermal power plants due to its maturity and high efficiency. Titanium TiO 2 As a carrier, loaded vanadium oxide as an active component supplemented by WO 3 A metal oxide catalyst for a group of catalysts. In actual use, the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30
CPCB01J23/30
Inventor 施雅琼
Owner 上海净球环保科技有限公司
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