Preparation method of Cu-Ce-La-SSZ-13 molecular sieve catalyst

A molecular sieve and catalyst technology, which is applied in the preparation of Cu-Ce-La-SSZ-13 molecular sieve catalyst and chabazite SSZ catalyst, can solve the problems of low water resistance and sulfur resistance, which need to be improved, and achieve sulfur resistance Improvement, excellent low-temperature catalytic activity, and the effect of increasing active ingredients

Active Publication Date: 2018-06-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hydrothermal stability of Cu-Ce-SSZ-13 has been improved compared with Cu-SSZ-13, its resistance to water and sulfur is still low and needs to be improved

Method used

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  • Preparation method of Cu-Ce-La-SSZ-13 molecular sieve catalyst
  • Preparation method of Cu-Ce-La-SSZ-13 molecular sieve catalyst
  • Preparation method of Cu-Ce-La-SSZ-13 molecular sieve catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Dissolve 6.2222g NaOH in 25mL deionized water, after the dissolution is complete, add 3.1877g NaAlO 2 , Stir continuously until the solution is completely dissolved and the solution becomes clear and transparent. Take another beaker, dissolve 7.1367g copper sulfate pentahydrate with 30mL deionized water, and place it in a constant temperature water bath at 25°C. After the dissolution is complete, 5.4111 g of tetraethylenepentamine is slowly added dropwise to the copper sulfate solution, and the beaker containing the tetraethylenepentamine liquid is rinsed with 5 mL of deionized water. Add 0.3040g Ce(NO) after Cu-TEPA complexation for 4h 3 ·6H 2 O and 0.3867g LaNO) 3 ·6H 2 O continued stirring for 1 h. After the complexation is completed, slowly add the template solution to the configured NaOH, NaAlO 2 solution, and rinse the beaker containing the template solution with 5mL deionized water. After stirring the mixed solution for 5-10 minutes, add 38.2000g of silica...

Embodiment 2

[0025] This example is basically the same as Example 1, the only difference is that the homogeneous hydrothermal reaction temperature is 140°C. After centrifugation, the obtained product has a small amount of impurity layered, most of which are consistent with the appearance of the product at 160°C.

Embodiment 3

[0031] Test the denitration performance of Cu-Ce-La-SSZ-13 molecular sieve, the gas space velocity (GHSV) is 200000h -1 . The reactant gas composition is 1000ppm nitrogen oxides, 1000ppm NH 3 , 5% O 2 and the balance gas is N 2 . From figure 2It can be seen that the maximum catalytic activity of Cu-Ce-La-SSZ-13 molecular sieve synthesized by one step and Cu-Ce-SSZ-13 molecular sieve synthesized by ion exchange increases with the increase of temperature, and both reach more than 95% at 210 °C . The maximum catalytic activity of the one-step synthesized Cu-Ce-La-SSZ-13 molecular sieve was achieved at 240°C, while the maximum catalytic activity of the Cu-Ce-SSZ-13 molecular sieve synthesized by ion exchange was achieved at 270°C. It shows that the one-step synthesis of Cu-Ce-La-SSZ-13 expands the range of the optimal denitration temperature window, and further improves the denitration efficiency of the low temperature section and the high temperature section.

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Abstract

The invention discloses a preparation method of a Cu-Ce-La-SSZ-13 molecular sieve catalyst. The method is characterized in that a molecular sieve structure guide agent is formed jointly through addingCe(NO)3.6H2O and La(NO)3.6H2O after preliminary complexation of Cu<2+> and tetraethylene pentamine, and a Cu-Ce-La-SSZ-13 molecular sieve is synthesized through one step. The preparation method disclosed by the invention is simple; lanthanum as a third active component is introduced, so that the stability of the lanthanum in the molecular sieve and the oxidation capacity of the molecular sieve are improved. The Cu-Ce-La-SSZ-13 molecular sieve prepared by the preparation method disclosed by the invention has excellent low-temperature catalytic activity, the SCR activity reaches above 90 percent at a temperature of 180 DEG C, and meanwhile, the water resistance and the sulfur resistance are improved.

Description

technical field [0001] The invention relates to a preparation method of a chabazite SSZ catalyst, in particular to a preparation method of a Cu-Ce-La-SSZ-13 molecular sieve catalyst, which belongs to the industrial catalytic NO X technology field. Background technique [0002] Selective Catalytic Reduction (SCR) technology is effective for NO X One of the governance techniques. Among them, the transition metal / rare earth metal doped SSZ-13 molecular sieve catalyst has attracted widespread attention due to its excellent catalytic performance and environmental friendliness (Yang Bo et al. Progress in the synthesis and application of SSZ-13 molecular sieves[J].Chemical Progress, 2014, 33(02):368-373+386.). Such as literature 1 (Ren Limin, et al.Designed copper-amine complex as an efficient template for one-pot synthesis of Cu-SSZ-13zeolite with excellent activity for selectivecatalytic reduction of NOx by NH 3 .[J].Chemical Communications, 2011, 47(35)) reported Cu-SSZ-13 m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/46B01J29/76B01D53/86B01D53/56
CPCB01D53/8628B01J29/763C01B39/46C01P2002/72
Inventor 曲虹霞迟斌李华正沈冠男郭蕾崔健张怡
Owner NANJING UNIV OF SCI & TECH
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