Environment-friendly type high-temperature denitrification catalyst and preparation method thereof

An environment-friendly, denitration catalyst technology, which is applied in the field of environmental protection catalytic materials and air pollution prevention and control, can solve the problems of complex preparation process, poor high temperature activity, narrow catalyst activity temperature window, etc., and achieve the effect of simple preparation process and reduced harm

Active Publication Date: 2019-03-26
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ZSM-5 molecular sieve catalyst has poor structural stability at high temperature, and is prone to carbon deposition and metal deposition to reduce catalytic activity, and its poisoning with heavy metals can cause permanent deactivation
Patents (201310208308.0), (201611235168.6), (201510401286.9), (201610652524.8) etc. use rare earth oxides or transition metal ions iron, manganese, copper, zirconium, etc. as the main active components to prepare denitrification catalysts, but the series prepared The activity temperature window of the catalyst is narrow, the high temperature activity is poor, and the preparation process is complicated

Method used

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  • Environment-friendly type high-temperature denitrification catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of carrier

[0034] With the mass percentage of titanium dioxide / gamma alumina as 1:10%, weigh 30g of titanium dioxide and 3g of gamma alumina respectively, and mix them uniformly to obtain a catalyst carrier;

[0035] (2) Preparation of tungsten-zirconium composite ion precursor solution

[0036] Screen and weigh 0.46g of ammonium paratungstate and 1.50g of deionized water to mix, stir evenly until the solution is clear and transparent, and obtain solution A;

[0037] Screen and weigh 2.26g of zirconium chloride and add 4.71g of deionized water to mix, stir evenly until the solution is clear and transparent, and obtain solution B;

[0038] Wherein the ion molar ratio of the A and B solutions is 1:1.5, the solution B is added to the solution A, and the dropping process needs to be stirred to obtain a tungsten-zirconium saturated solution;

[0039] (3) Catalyst sludge preparation and pretreatment

[0040] Based on the mass of the carrier, the mass percen...

Embodiment 2

[0046] (1) Preparation of cocatalyst precursor ion solution

[0047] Screen and weigh 1.51g of erbium chloride hexahydrate and 0.70g of tin tetrachloride pentahydrate, dissolve in 5g of deionized water, stir and dissolve until the solution is clear and transparent, and obtain a co-catalyst precursor solution;

[0048] (2) Preparation of carrier

[0049] Take by weighing 30g titanium dioxide and impregnate in equal volume with the co-catalyst solution prepared in step (1), after drying and pulverizing, mix it with 1.5g gamma alumina to obtain a catalyst carrier, wherein titanium dioxide / co-catalyst The mass percent of / gamma alumina is 1:3%:5%;

[0050] (3) Preparation of tungsten-zirconium composite ion precursor solution

[0051] Screen and weigh 4.14g of ammonium tungstate and 6.22g of deionized water to mix, stir evenly until the solution is clear and transparent, and obtain solution A;

[0052] Screen and weigh 5.73g of zirconium oxychloride and add 8.61g of deionized w...

Embodiment 3

[0061] (1) Preparation of cocatalyst precursor ion solution

[0062] Screen and weigh 0.33g of barium nitrate and 0.15g of erbium chloride hexahydrate, dissolve them in 3g of deionized water, place them in a constant temperature water bath at 85°C, stir and dissolve until the solution is clear and transparent, and obtain a co-catalyst precursor solution ;

[0063] (2) Preparation of carrier

[0064] Take by weighing 30g titanium dioxide and impregnate in equal volume with the co-catalyst solution prepared in the step (1), after drying and pulverizing, mix it with 9g gamma alumina to obtain a catalyst carrier, wherein titanium dioxide / co-catalyst / The mass percent of gamma alumina is 1:1%:30%;

[0065] (3) Preparation of tungsten-zirconium composite ion precursor solution

[0066] Screen and weigh 1.86g of ammonium metatungstate and 2.79g of deionized water to mix, stir evenly until the solution is clear and transparent, and obtain solution A;

[0067] Screen and weigh 2.19...

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Abstract

The invention relates to an environment-friendly type high-temperature denitrification catalyst and a preparation method thereof. The preparation method comprises the following steps: taking tungstenzirconium composite oxide as a main catalyst component, one or more of barium, erbium, tin, iron, molybdenum, cobalt, copper, manganese or lanthanum as a co-catalyst, titanium white powder as a carrier component and aluminum oxide as an auxiliary molding agent; preparing co-catalyst ion salt into a saturated solution; immersing the titanium white powder carrier into the co-catalyst solution according to the equal volume; after drying and pulverizing, uniformly mixing with the auxiliary molding agent aluminum oxide; uniformly stirring a tungsten zirconium ion saturated solution of the main catalyst component, an organic molding agent and a powder material, mixing, ageing and extruding and molding; and drying and roasting to obtain an integral honeycomb catalyst. The catalyst provided by theinvention has the advantages of relatively good high-temperature denitrification effect and thermal stability, toxin-free components, environment friendliness, simple preparation technology and the like; and the environment-friendly type high-temperature denitrification catalyst is especially applicable to removal of high-temperature NOx in tail gas of high-speed diesel engines and denitrification of fixed-source high-temperature tail gas of a petrochemical industry and the like.

Description

technical field [0001] The invention relates to an environment-friendly high-temperature denitrification catalyst and a preparation method thereof, which belong to the fields of environmental protection catalytic materials and air pollution prevention and control, and are especially suitable for medium and high-speed diesel engines and tail gas high-temperature NO in petrochemical industries. X removal. Background technique [0002] Diesel engines have the advantages of high power, low energy consumption, and good economic performance, but their exhaust emissions are large and their components are complex, so they have a great impact on the environment and human health. The main pollutants in diesel engine exhaust are: nitrogen oxides (NO X ), hydrocarbons (HC), carbon monoxide (CO) and suspended particles (particulate matter; PM), among which NO X as its main harmful ingredient. my country's annual NO X The total emission is as high as 1 million tons, and it has been in...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/888B01J23/889B01D53/94B01D53/56
CPCB01D53/9418B01J23/002B01J23/30B01J23/888B01J23/8892B01J2523/00B01D2258/012B01J2523/31B01J2523/47B01J2523/48B01J2523/69B01J2523/3775B01J2523/43B01J2523/25B01J2523/3706B01J2523/842B01J2523/17B01J2523/72Y02T10/12
Inventor 沈岳松陶兴军沈建宇陈蒙蒙
Owner NANJING UNIV OF TECH
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