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One-step method for preparing cu-ssz-39 molecular sieve

A technology of cu-ssz-39 and cu-ssz-13, which is applied in the field of preparing Cu-SSZ-39 molecular sieve by one-step method, can solve the problems of high production, unfavorable large-scale industrial production, and low yield of molecular sieve, and is easy to realize , excellent catalytic performance, simple and reliable synthesis process

Active Publication Date: 2021-07-02
TIANJIN PASSION ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the manufacturing method of Cu-SSZ-39 molecular sieve generally adopts the following method: piperidinium hydroxide as an organic structure directing agent (SDA) is added to Y-type zeolite and silica-based substances as raw materials , stirring in the presence of alkali and carrying out hydrothermal synthesis, and then carrying out copper loading with copper salt after treatment, and then processing again to obtain Cu-SSZ-39 molecular sieve, the yield of molecular sieve synthesized by this method is low, production Relatively high, not conducive to large-scale industrial production

Method used

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  • One-step method for preparing cu-ssz-39 molecular sieve
  • One-step method for preparing cu-ssz-39 molecular sieve
  • One-step method for preparing cu-ssz-39 molecular sieve

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Experimental program
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Effect test

Embodiment 1

[0034] Step S110: Add tetrapropylammonium hydroxide, Cu-SSZ-13 molecular sieves, and an aqueous solution containing N,N-dimethyl 3,5-dimethylpiperidinium hydroxide (mass Concentration is 25.0%) and deionized water, stirred at room temperature for 1 h to form a gel. Among them, the molar ratio of N,N-dimethyl 3,5-dimethylpiperidinium hydroxide to silicon in silica sol is 0.08:1, and the silicon dioxide and aluminum oxide in Cu-SSZ-13 molecular sieve The molar ratio is 25:1, the mass ratio of copper atoms to Cu-SSZ-13 molecular sieve is 0.03, and the molar ratio of tetrapropylammonium hydroxide to silicon dioxide of Cu-SSZ-13 molecular sieve is 0.4:1.

[0035] Step S120: Move the gel into the hydrothermal reaction kettle, add the seed crystal SSZ-39 hydrogen molecular sieve, seal it well, place the hydrothermal reaction kettle in a blast oven, react at 160°C for 60h, cool the reaction The slurry was filtered through a funnel with a sand core, and the filter cake was washed twic...

Embodiment 2

[0046] Step S110: Add tetrapropylammonium hydroxide, Cu-SSZ-13 molecular sieves, and an aqueous solution containing N,N-dimethyl 3,5-dimethylpiperidinium hydroxide (mass Concentration is 25.0%) and deionized water, stirred at room temperature for 1 h to form a gel. Among them, the molar ratio of N,N-dimethyl 3,5-dimethylpiperidinium hydroxide to silicon in silica sol is 0.16:1, and the silicon dioxide and aluminum oxide in Cu-SSZ-13 molecular sieve The molar ratio is 30:1, the mass ratio of copper atoms to Cu-SSZ-13 molecular sieve is 0.02, and the molar ratio of tetrapropylammonium hydroxide to silicon dioxide of Cu-SSZ-13 molecular sieve is 0.3:1.

[0047] Step S120: Move the gel into the hydrothermal reaction kettle, add the seed crystal SSZ-39 hydrogen molecular sieve, seal it well, place the hydrothermal reaction kettle in a blast oven, react at 200°C for 36h, cool the reaction The slurry was filtered through a funnel with a sand core, and the filter cake was washed twic...

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Abstract

The invention discloses a synthetic method for preparing Cu‑SSZ‑39 molecular sieves in one step. The method adopts piperidines as an organic template, forms a gel with Cu-SSZ-13 molecular sieve and an alkaline substance, and synthesizes Cu-SSZ-39 molecular sieve by dynamic crystallization hydrothermally. The obtained molecular sieve samples showed excellent catalytic performance in NH3-SCR reaction. The molecular sieve synthesis method has a high synthesis yield, does not need to add additional silicon source and aluminum source, does not need ammonium exchange and copper exchange, and directly synthesizes Cu-SSZ-39 in one step. The synthesis process is simple, reliable, and easy to implement.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a method for preparing Cu-SSZ-39 molecular sieves in one step. Background technique [0002] Nitrogen oxides (NO x ) will cause a series of environmental problems such as photochemical smog, acid rain and greenhouse effect, which have seriously endangered human health, and with the increase in the number of motor vehicles and the rapid development of industry, NO x Emissions are increasing day by day, which will inevitably lead to serious deterioration of ecology and environment. Thus, eliminating NO x The problem of pollution is urgent. Currently, NO x The dominant control technology is NH 3 Selective catalytic reduction (NH 3 -SCR), the key is to select a catalyst with excellent performance, which will determine the success or failure of the entire catalytic reaction system. [0003] Selective catalytic reduction (selective catalytic reduction, abbreviated as SCR) cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/48B01J29/76
CPCB01J29/76B01J2229/18C01B39/48C01P2002/72C01P2004/03C01P2004/30
Inventor 梁珂王广涛
Owner TIANJIN PASSION ADVANCED MATERIAL TECH CO LTD