Synthesis method of copper-cerium co-doped CNT-coated SAPO-34 composite denitration catalyst

A technology of denitration catalyst and synthesis method, which is applied in the field of synthesis of copper and cerium co-doped CNT@SAPO-34 composite denitration catalyst, can solve the problems of poor water resistance and sulfur resistance, low loading of active components, etc., and achieve good water resistance Sulfur resistance, good stability effect

Pending Publication Date: 2021-05-11
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is in order to solve the existing diesel vehicle NH 3 - The technical problems of SCR catalyst thermal stability, poor water resista

Method used

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  • Synthesis method of copper-cerium co-doped CNT-coated SAPO-34 composite denitration catalyst
  • Synthesis method of copper-cerium co-doped CNT-coated SAPO-34 composite denitration catalyst
  • Synthesis method of copper-cerium co-doped CNT-coated SAPO-34 composite denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: The synthesis method of a copper-cerium co-doped CNT@SAPO-34 composite denitration catalyst in this example is carried out according to the following steps:

[0029] Step 1: 1.56g Ce(NO 3 ) 3 ·6H 2 O and 2.2g of Cu(NO 3 ) 2 ·3H 2 O was dissolved in 20.1 mL of water, then 1.0 mL of tetraethylenepentamine (TEPA) and 0.72 g of carbon nanotube (CNT) powder were added, and stirred until uniformly mixed to obtain a mixed solution;

[0030] Step 2: Dissolve 12.5g of aluminum isopropoxide in 22.9mL of deionized water, then add 6.3mL of diethylamine (DEA), stir at room temperature for 1 hour, then add 4mL of tetraethyl orthosilicate (TEOS), continue at room temperature Stir for 4h, then slowly add 4mLH to the system at a rate of 0.5mL / min 3 PO 4 (85wt%), continue to stir until forming sol, obtain sol;

[0031] Step 3: Add the mixed solution obtained in Step 1 to the sol obtained in Step 2, stir for 2 hours and then ultrasonicate at 40 kHz for 1 hour to obtain ...

Embodiment 2

[0032] Example 2: The synthesis method of a copper-cerium co-doped CNT@SAPO-34 composite denitration catalyst of this example is carried out according to the following steps:

[0033] Step 1: 0.78g Ce(NO 3 ) 3 ·6H 2 O and 0.44g of Cu(NO 3 ) 2 ·3H 2 O was dissolved in 9 mL of water, then 0.34 mL of tetraethylenepentamine (TEPA) and 0.18 g of carbon nanotube (CNT) powder were added, and stirred until uniformly mixed to obtain a mixed solution;

[0034] Step 2: Dissolve 6.13g of aluminum isopropoxide in 10mL of deionized water, then add 3.1mL of diethylamine (DEA), stir at room temperature for 1 hour, then add 2mL of tetraethyl orthosilicate (TEOS), and continue stirring at room temperature 4h, then slowly add 2.0mLH to the system at a rate of 0.5mL / min 3 PO 4 (85wt%), continue to stir until forming sol, obtain sol;

[0035] Step 3: Add the mixed solution obtained in Step 1 to the sol obtained in Step 2, stir for 2 hours and then ultrasonicate at 40 kHz for 1 hour to obta...

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Abstract

The invention relates to a synthesis method of a copper-cerium co-doped CNT-coated SAPO-34 composite denitration catalyst. The invention belongs to the field of denitration catalyst preparation. The invention aims to solve the technical problems of poor thermal stability, water resistance and sulfur resistance and low active component loading capacity of an existing NH3-SCR catalyst for a diesel vehicle. The method comprises the following steps: step 1, loading active components Cu and Ce on a carbon nanotube by using an impregnation method to obtain a mixed solution; 2, taking aluminum isopropoxide, phosphoric acid, tetraethyl orthosilicate and diethylamine as an aluminum source, a phosphorus source, a silicon source and a template agent to obtain sol; and 3, adding the mixed solution into the sol, conducting stirring, carrying out ultrasonic treatment, conducting crystallizing, carrying out suction filtration, conducting washing, conducting drying, and conducting roasting in an N2 atmosphere to obtain the copper-cerium co-doped CNT-coated SAPO-34 composite structure catalyst. The catalyst provided by the invention has good stability, water resistance and sulfur resistance. When the temperature is higher than 200 DEG C, the conversion rate of NOx can reach 100%. Meanwhile, the active components are high in loading capacity and good in dispersity, and the effects of high reactant adsorbability and good low-temperature stability are achieved.

Description

technical field [0001] The invention belongs to the field of denitration catalyst preparation, and in particular relates to a synthesis method of a copper-cerium co-doped CNT@SAPO-34 composite denitration catalyst. Background technique [0002] Nitrogen oxide NO x emissions seriously pollute the atmosphere, NH 3 Selective catalytic reduction (NH 3 -SCR) is to purify NO in emissions from mobile sources x One of the mainstream technologies. The catalyst is the whole NH 3 -The core and key of the SCR system. Currently, V 2 o 5 -WO 3 / TiO 2 The catalyst has been applied as the first generation SCR catalyst for diesel vehicles due to its high activity and excellent sulfur resistance. However, there are still many problems in the application of vanadium-based oxide catalysts, such as biological toxicity, poor high temperature stability, and narrow operating temperature window. Therefore, many developed countries have banned its use in diesel vehicle exhaust denitrificat...

Claims

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Application Information

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IPC IPC(8): B01J29/85B01D53/94B01D53/56
CPCB01J29/85B01D53/9413B01J2229/183B01D2251/2062
Inventor 马媛媛李智芳张辉
Owner QIQIHAR UNIVERSITY
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