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Preparation method of Cu-SSZ-13 with wide temperature window, obtained product and application thereof

A cu-ssz-13, wide temperature technology, applied in the field of molecular sieves, can solve the problems of poor dispersion, narrow temperature window, low loading, etc., and achieve improved content and dispersion performance, improved dispersion uniformity, and high copper content Effect

Active Publication Date: 2020-07-14
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of NH in Cu-SSZ-13 catalyst caused by low Cu loading and poor dispersion, etc. 3 -The problem of the narrow temperature window of SCR, the present invention provides a kind of preparation method and the product obtained of Cu-SSZ-13 of wide temperature window, this method has been improved and optimized to ion exchange method, gained Cu-SSZ-13 has Cu High content (Cu content about 5.3-5.6 wt.%), Cu atomic level dispersion, excellent NH in a wide temperature window 3 -SCR performance and other advantages

Method used

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  • Preparation method of Cu-SSZ-13 with wide temperature window, obtained product and application thereof
  • Preparation method of Cu-SSZ-13 with wide temperature window, obtained product and application thereof
  • Preparation method of Cu-SSZ-13 with wide temperature window, obtained product and application thereof

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Experimental program
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Effect test

Embodiment 1

[0033] 1. First, 20.4 g of 4 wt% NaOH solution, 46.1 g of deionized water and 16.9 g of 25 wt.% N, N, N-trimethyl-1-adamantyl ammonium hydroxide The aqueous solution was added to a 500 mL plastic beaker and stirred at room temperature for 30 min; then, 1.89 g of Al(OH) with a purity of 98% was added 3 and 6 g of fumed silica, and the initial gel was obtained after stirring for 24 h in an incubator (25 °C), and then the initial gel was transferred to a 100 mL stainless steel high-temperature reactor, and the homogeneous rotary reactor was rotated at 40 rpm / min at 160°C for 4 days, then centrifuged, washed to neutral, dried overnight at 100°C for 12 h, and finally raised to 575°C in a tube furnace at a rate of 1°C / min and kept for 8 h. The Na-type SSZ-13 was obtained, and the molar ratio of silicon oxide and aluminum oxide in the feeding material of the Na-type SSZ-13 was 8.4, and the actual molar ratio of silicon oxide and aluminum oxide was 9 as determined by EDS scanning.

...

Embodiment 2

[0038] 1. First, dissolve 0.8333 g of sodium hydroxide in 37.8 g of water, then add 6.6 mL of N, N, N-trimethyl-1-adamantyl ammonium hydroxide aqueous solution with a mass fraction of 25 wt.%, and stir at room temperature for half hour, then add 11.1 mL of sodium silicate aqueous solution, and then add 2 g of ultra-stable Y molecular sieve with a silicon-aluminum ratio of 5.4 (specific surface area of ​​700 m 2 g -1 ), stirred at room temperature for one hour to obtain the initial gel, and then transferred the initial gel to a 100 mL stainless steel high-temperature reactor, crystallized at 140 °C for 6 days at a speed of 40 rpm in a homogeneous rotary reactor, and then Centrifuge, wash until neutral, dry overnight at 100 °C for 12 h, and finally heat up to 575 °C at a heating rate of 1 °C / min in a tube furnace for 8 h to obtain Na-type SSZ-13, the Na-type SSZ-13 The molar ratio of silicon oxide and aluminum oxide in the feeding material is 20, and the actual molar ratio of s...

Embodiment 3

[0042] 1. First, dissolve 2.0833 g of sodium hydroxide in 94.55 g of water, then add 26.46 mL of N, N, N-trimethyl-1-adamantyl ammonium hydroxide aqueous solution with a mass fraction of 25 wt.%, and stir at room temperature for half an hour hours, then add 27.75 mL of sodium silicate aqueous solution, and then add 5 g of ultra-stable Y molecular sieves with a silicon-aluminum ratio of 5.4 (the specific surface area is 700 m 2 g -1 ), stirred at room temperature for one hour to obtain the initial gel, and then transferred the initial gel to a 500 mL stainless steel high-temperature reactor, crystallized in a homogeneous rotary reactor at a speed of 60 rpm at 140 °C for 6 days, and then Centrifuge, wash until neutral, dry overnight at 100 °C for 12 h, and finally heat up to 575 °C at a heating rate of 1 °C / min in a tube furnace for 8 h to obtain Na-type SSZ-13, the Na-type SSZ-13 The molar ratio of silicon oxide and aluminum oxide in the feed is 20, and the actual molar ratio ...

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Abstract

The invention discloses a preparation method of Cu-SSZ-13 with a wide temperature window, an obtained product and application thereof, the method uses a Na-type SSZ-13 molecular sieve with a low silica-alumina ratio as a raw material, and then NH4NO3 and CuSO4 exchange is carried out on the Na-type SSZ-13 molecular sieve in order to obtain Cu-SSZ-13. According to the preparation method, the content and the dispersing performance of Cu are improved, the obtained Cu-SSZ-13 product is high in copper content (the Cu content is about 5.3-5.6 wt.%), and copper is in atomic dispersion; the excellentNH3-SCR performance is realized in a wide temperature window; and when the air speed is 100000 h <-1>, the NOx conversion rate in the temperature interval of 175-600 DEG C reaches 100% or above, the N2 selectivity close to 100% is kept in the whole temperature interval of 100-600 DEG C, and the good application prospect is achieved.

Description

technical field [0001] The invention relates to a high degree of atomic dispersion, NH 3 - The preparation method of Cu-SSZ-13 with a wide SCR temperature window, the obtained product and its application, which belong to the technical field of molecular sieves. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants that cause acid rain, photochemical smog, haze and atmospheric ozone concentration to rise, motor vehicle exhaust is NO x The main source of emissions, according to the "China Mobile Source Environmental Management Annual Report (2019)", the NO emitted by diesel vehicles x It is close to 70% of the total vehicle emissions and is the top priority of motor vehicle pollution prevention and control. At present, in order to meet the requirements of national emission regulations for diesel vehicles, NH 3 Selective catalytic reduction (NH 3 -SCR) NO x is a must-have technology. Currently, commercially used NH 3 -SCR catalyst is V 2 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01D53/86B01D53/56
CPCB01J29/763B01D53/8628B01J35/394
Inventor 张昭良张娜娜辛颖贾俊秀张永凯李倩王进
Owner UNIV OF JINAN
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