Monolithic SCR (Selective Catalytic Reduction) honeycomb catalyst for processing diesel exhaust and preparation method of catalyst

A honeycomb catalyst and exhaust gas treatment technology, applied in physical/chemical process catalysts, catalyst carriers, chemical instruments and methods, etc., can solve the problems of poor low temperature and high temperature activity, simple components, easy deactivation, etc., and achieve high temperature stability. Good, simple preparation, wide active temperature window

Active Publication Date: 2014-07-09
浙江欧信环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst has good medium-temperature activity, and the denitrification efficiency is over 90% in the temperature range of 300°C-400°C. However, due to the simple components, its low-temperature and high-temperature activity is poor, and it is sensitive to sulfur and water vapor, and is easy to deactivate.

Method used

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  • Monolithic SCR (Selective Catalytic Reduction) honeycomb catalyst for processing diesel exhaust and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a. Rinse a 350-mesh honeycomb ceramic carrier of 300mm*300mm*150mm with deionized water, and then dry it at 105°C for 5 hours for later use.

[0028] b. Weigh 2307g titanyl sulfate and dissolve it in water, stir continuously to dissolve it completely, and filter the solution to remove insoluble impurities therein, weigh 436g zirconium nitrate and dissolve it in water, mix titanyl sulfate solution and zirconium nitrate solution evenly The zirconium-titanium mixed solution was prepared, and the zirconium-titanium mixed solution and ammonia water were added into a reactor containing a small amount of water in parallel flow, and the pH value of the reaction solution was controlled to be 10 by adjusting the drip rate of ammonia water to obtain a white precipitate. The precipitate was suction-filtered, washed, detected with Ba(NO3)2, then dried at 105° C. for 12 hours, and calcined at 500° C. for 3 hours to obtain ZrO2 / TiO2 composite oxide carrier powder.

[0029] c. Weigh 50...

Embodiment 2

[0033] Embodiment 2: carry out according to the operating procedure of embodiment 1, adjust ferric nitrate to be 193.1g, cerium nitrate is 0g, lanthanum nitrate is 33.3g, binding agent is 71.6g, and glacial acetic acid is 50.1g, control catalyst slurry in step 4 The solid content of the material is 47.5%, the viscosity is 545Pa.S, and the pH value is 3.5. The dosage of other components, the preparation operation and the activity test method are the same as in Example 1. After testing, the NO conversion rate has reached more than 85%, and the highest is 100%. %.

Embodiment 3

[0034]Embodiment 3: Carry out according to the operation procedure of embodiment 1, adjust ammonium tungstate to be 117.9g, iron nitrate to be 193.1g, cerium nitrate to be 0g, praseodymium nitrate to be 33.1g, binding agent to be 35.8g, glacial acetic acid to be 50.1g , in step 4, the solid content of the catalyst slurry is controlled to be 50.5%, the viscosity is 415Pa.S, the pH value is 3.5, and the activity test reaction temperature is 180-530°C. The amount of other components, preparation operations and activity test methods are the same as those in Example 1 same. After testing, the conversion rate of NO has reached more than 90%, and the highest is 100%.

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Abstract

The invention discloses a monolithic SCR (Selective Catalytic Reduction) honeycomb catalyst for processing diesel exhaust and a preparation method of the catalyst. The catalyst comprises a honeycomb ceramic carrier and a coating; the coating coats a honeycomb hole, and the coating consists of a ZrO2 / TiO2 composite oxide carrier and catalyst active components. The ZrO2 / TiO2 composite oxide carrier comprises the following components in percentage by weight: 5wt%-20wt% of ZrO2 and 50wt%-85wt% of TiO2. The catalyst active components comprise the following components in percentage by weight: 1wt%-5wt% of V2O5, 1wt%-10wt% of WO, 1wt%-5wt% of Fe2O3, 1wt%-5wt% of CuO, 1wt%-10wt% of rare earth metal oxide and the balance of an adhesion agent. The preparation method of the catalyst comprises the following steps: firstly preparing the ZrO2 / TiO2 composite oxide carrier, subsequently preparing a vanadium-tungsten-zirconium-titanium powder catalyst, then dispersing the vanadium-tungsten-zirconium-titanium powder catalyst in other components to prepare a catalyst slurry; and then coating the honeycomb ceramic carrier with the catalyst slurry, drying and roasting, and then preparing the monolithic SCR honeycomb catalyst. The monolithic SCR honeycomb catalyst is suitable for purifying diesel exhaust NOx and has the characteristics of wide active temperature window at 160-550 DEG C, high NOx removal rate, strong antitoxic performance, long service life and simplicity in preparation.

Description

technical field [0001] The invention belongs to the technical field of automobile tail gas purification and treatment, and relates to a catalyst, in particular to an integral SCR honeycomb catalyst for diesel vehicle tail gas treatment and a preparation method thereof. Background technique [0002] As we all know, in recent years, with the rapid economic development, my country's automobile production and ownership have been showing a trend of rapid growth. The NOx emitted by motor vehicles (especially diesel vehicles) has brought great damage to the environment. Nitrogen oxides (NOx) are gases caused by acid rain and photochemical smog pollution. my country's NOx pollution is becoming more and more serious. The concentration of nitrogen oxides in the air of some large cities exceeds the standard. The environmental capacity of nitrogen oxides is basically in a saturated state, and photochemical smog even appears in some places. [0003] my country is about to implement the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J32/00B01J35/10B01D53/56B01D53/94
Inventor 黄燕杨刚李益建
Owner 浙江欧信环保科技有限公司
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