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Preparation process and application of composite titaniferous solution for waste gas catalytic purification

A technology of catalytic purification and preparation process, applied in the field of materials, can solve the problems of increasing the cost of environmental protection of enterprises, large particle size of titanium dioxide, inability to coat into the wall-flow carrier, etc. The effect of increasing the contact area and increasing the efficiency of sulfur removal

Active Publication Date: 2020-04-17
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the metatitanic acid heat treatment process will produce a large amount of air pollutants (such as NH 3 , NO x , SO x etc.), including this process in the catalyst production process will increase the environmental management cost of the enterprise
At the same time, the particle size of titanium dioxide prepared by the current process is generally large, and it cannot be coated into the interior of the wall flow carrier.

Method used

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  • Preparation process and application of composite titaniferous solution for waste gas catalytic purification
  • Preparation process and application of composite titaniferous solution for waste gas catalytic purification
  • Preparation process and application of composite titaniferous solution for waste gas catalytic purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Metatitanic acid desulfurization: In the bubbling reactor, the metatitanic acid produced by the sulfuric acid method is diluted with water to form a slurry; then the air containing monoethanolamine is pumped from the bubbling ports at the bottom of both sides of the reactor into the constantly stirring In the slurry, after reacting for 6 hours, the slurry was transferred to a plate and frame filter press, filtered and washed to obtain a titanium cake, and the sulfur content in the obtained titanium cake is shown in Table 1;

[0032]2. Titanium cake grinding: In the grinding machine, after adding concentrated nitric acid and polyethylene glycol, under the condition of a line speed of 10m / s, after grinding for 6 hours, the ultrafine titanium liquid required by the regulations (see Table 1) is obtained, and then transferred to the stirring tank;

[0033] 3. Addition of active substances: Transfer part of the ground ultrafine titanium liquid to a stirring preparation ket...

Embodiment 2

[0037] 1. Metatitanic acid desulfurization: In the bubbling reactor, the metatitanic acid produced by the sulfuric acid method is diluted with water to form a slurry; then the air containing ethylenediamine is pumped from the bubbling ports at the bottom of both sides of the reactor to keep stirring In the slurry, after reacting for 6h, the slurry was transferred to a plate and frame filter press, filtered and washed to obtain a titanium cake, and the sulfur content in the gained titanium cake was shown in Table 1;

[0038] 2. Titanium cake grinding: In the grinding machine, after adding concentrated nitric acid and polyethylene glycol, under the condition of a linear speed of 10m / s, after grinding for 5 hours, obtain the ultrafine titanium liquid required by the regulations (see Table 1), and then transfer to the stirring tank;

[0039] 3. Addition of active substances: transfer part of the ground ultrafine titanium liquid to a stirring preparation kettle, then add ammonium m...

Embodiment 3

[0043] 1. Metatitanic acid desulfurization: In the bubbling reactor, the metatitanic acid produced by the sulfuric acid method is diluted with water to form a slurry; then the air containing urea is pumped into the constantly stirring slurry from the bubbling ports at the bottom of both sides of the reactor After reacting for 6 hours, the slurry was transferred to a plate and frame filter press, filtered and washed to obtain a titanium cake, and the sulfur content in the obtained titanium cake was shown in Table 1;

[0044] 2. Titanium cake grinding: In the grinding machine, after adding concentrated nitric acid and HPMA, under the condition of a linear speed of 12m / s, after grinding for 6 hours, obtain the required ultrafine titanium liquid (see Table 1), and then transfer to the stirring tank middle;

[0045] 3. Active material addition: transfer part of the ground ultrafine titanium solution to a stirring preparation kettle, then add aluminum glue, cerium nitrate, zirconium...

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Abstract

The invention discloses a preparation process and application of a composite titaniferous solution for catalytic purification of waste gas. The process comprises the following steps: pumping an alkaline gas into a metatitanic acid slurry which is continuously stirred by a bubbling method to realize desulfurization, adding a strong acid or a strong alkali solution and a dispersing agent into a titanium cake obtained by desulfurization, grinding to obtain ultrafine titaniferous solution, adding an active component, an auxiliary agent and a stabilizing agent which are soluble under strong acid orstrong alkali conditions, and stirring to form composite titaniferous solution; carrying out uniform loading of the obtained product into a wall flow type carrier (such as a ceramic fiber pipe, a filter bag, a basalt filter pipe, a DPF and the like) with rich pore structures in a pressurizing or negative pressure extraction form, wherein the coated carrier can be used for denitration of a fixed source and a movable source. The composite titaniferous solution disclosed by the invention has the excellent properties of ultrafine granularity, high dispersion degree, strong permeability and the like, the production period can be greatly shortened and the production cost can be reduced when the composite titaniferous solution is used for coating the wall flow type carrier, and the produced catalytic purification product can be used for efficiently and synergistically removing various atmospheric pollutants and preventing a catalytic material from poisoning.

Description

technical field [0001] The invention belongs to the technical field of materials, relates to new environmental protection materials, in particular to a preparation process and application of a composite titanium solution for catalytic purification of exhaust gas. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, which mainly come from fixed emission sources such as coal-fired power plants, steel industry and cement industry, and mobile emission sources such as gasoline vehicles and diesel vehicles. Currently, achieving NO x The main technology for emission reduction is Selective Catalytic Reduction (SCR), of which the denitrification catalyst is the key to this technology. [0003] The production process of denitrification catalyst can generally be divided into two categories, one is the honeycomb catalyst formed by integral extrusion, and the other is the flat plate produced by coating the catalyst material on the surface of the carr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01J23/30B01J23/63B01J35/10B01D53/86B01D53/56
CPCB01J23/28B01J23/30B01J23/63B01D53/8628B01J35/60Y02A50/20
Inventor 刘雪松陈洪锋金云
Owner SHAOXING UNIVERSITY
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