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A kind of eutectic catalyst and its solid-state ion exchange method preparation and application

A technology of ion exchange and catalyst, which is applied in the direction of catalyst activation/preparation, molecular sieve catalyst, physical/chemical process catalyst, etc., which can solve the problems of inaccurate control of load capacity, poor hydration performance, poisoning performance, and low catalyst activity, etc., to improve Low temperature hydration resistance, emission reduction effect

Active Publication Date: 2021-10-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the problems of low catalyst activity, hydration performance and SO resistance in the preparation of pure phase molecular sieves in the prior art. 2 The poisoning performance is poor. The liquid-phase ion exchange process involves multiple steps such as washing, filtration, and drying, which produces a large amount of industrial wastewater. During phase ion exchange due to hydrated Cu 2+ The technical problem that the diameter (0.79nm) is too large requires multiple exchanges, and a co-crystal catalyst and its preparation and application by solid-state ion exchange method are provided

Method used

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  • A kind of eutectic catalyst and its solid-state ion exchange method preparation and application
  • A kind of eutectic catalyst and its solid-state ion exchange method preparation and application
  • A kind of eutectic catalyst and its solid-state ion exchange method preparation and application

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preparation example Construction

[0032] A kind of solid-state ion exchange preparation method of eutectic catalyst in the present invention, comprises the following steps:

[0033] (1) Dissolving phosphoric acid in deionized water, adding pseudo-boehmite and silica sol and stirring evenly at room temperature;

[0034] (2) Add template agent, pore forming agent and seed crystal subsequently, stir to obtain uniform mixture A;

[0035] (3) Thoroughly transfer the above mixture A to a polytetrafluoroethylene-lined reaction kettle and heat it at 180°C for 4 days to obtain a hydrothermal product. The product is centrifuged, dried, roasted, and ground to obtain a graded pore H-SAPO-18 / 34, then via NH 4 Cl exchange in aqueous solution yields hierarchically pore NH 4 -SAPO-18 / 34;

[0036] (4) Combining Cu-containing precursors with hierarchically porous NH 4 -SAPO-18 / 34 was stirred in a certain amount of deionized water for 1 min to obtain suspension B, and immediately transferred suspension B to a rotary evapora...

Embodiment 1

[0039] The Cu precursor used in this embodiment is copper nitrate trihydrate (Cu(NO 3 ) 2 3H 2 O), using mixture A ratio of 0.6SiO 2 :1.0Al 2 o 3 :0.9P 2 o 5 :2TEA:45H 2 O, F127 is the NH produced by the pore-forming agent 4 -SAPO-18 / 34 was used as the carrier, and the calcination condition was 600°C for 5h in air atmosphere.

[0040] The specific process is as follows: add 6.23g of phosphoric acid into 23.3g of deionized water and stir for 5min, then add 4.25g of pseudoboehmite and stir for 2h, add 3.6g of silica sol and stir for 1h; then add 6.07g of triethylamine (TEA), 0.5 g F127 and 0.1g SAPO-18 seed crystals were stirred for 3 hours to obtain a homogeneous mixture A; the above mixture A was thoroughly transferred to a polytetrafluoroethylene-lined reactor and hydrothermally heated at 180°C for 4 days to obtain a hydrothermal product, which was centrifuged , dried in water at 110°C for 12h, and roasted at 600°C in air atmosphere for 5h to obtain H-SAPO-18 / 34. We...

Embodiment 2

[0043] The Cu precursor used in this example is copper oxide (CuO), and the proportion of mixture A used is 0.6SiO 2 :1.0Al 2 o 3 :0.9P 2 o 5 :2TEA:45H 2 O, F127 is the NH produced by the pore-forming agent 4 -SAPO-18 / 34 was used as the carrier, and the calcination condition was 750°C for 8h in air atmosphere.

[0044] The specific process is as follows: add 6.23g of phosphoric acid into 23.3g of deionized water and stir for 5min, then add 4.25g of pseudoboehmite and stir for 2h, add 3.6g of silica sol and stir for 1h; then add 6.07g of triethylamine (TEA), 0.5 g F127 and 0.1g SAPO-18 seed crystals were stirred for 3 hours to obtain a homogeneous mixture A; the above mixture A was thoroughly transferred to a polytetrafluoroethylene-lined reactor and hydrothermally heated at 180°C for 4 days to obtain a hydrothermal product, which was centrifuged , dried at 110°C for 12h, and roasted at 750°C for 8h under air atmosphere to obtain H-SAPO-18 / 34. Weigh 10g of H-SAPO-18 / 34 an...

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Abstract

The invention discloses a eutectic catalyst and its preparation and application by a solid-state ion exchange method, belonging to the technical field of nitrogen oxide control. The preparation method is to exchange the two-phase symbiotic molecular sieve of SAPO-18 and SAPO-34 in an ammonium salt aqueous solution to obtain a two-phase symbiotic molecular sieve of ammonium type SAPO-18 and SAPO-34; -18 and SAPO-34 two-phase symbiotic molecular sieves were stirred in water for 30s-120s to obtain a suspension; the suspension was subjected to vacuum rotary evaporation and then ground, then roasted in an air atmosphere, and solid-state ion exchange occurred in the roasting process to obtain Two-phase co-existing eutectic catalyst of Cu-SAPO-18 and Cu-SAPO-34. The catalyst prepared by the invention improves the catalytic activity of the original Cu-SAPO-18, the low-temperature hydration performance of the Cu-SAPO-34 and the resistance to SO. 2 Poisoning performance; and the loading of Cu can be precisely controlled; solve the problem of hydration of Cu in the liquid phase ion exchange of small pore molecular sieves 2+ The technical problem that the diameter is too large and needs to be exchanged multiple times.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide control, and more specifically, relates to a eutectic catalyst and its preparation and application by a solid-state ion exchange method. Background technique [0002] NOx (mainly including NO and NO 2 ) as a typical air pollutant can form acid rain, photochemical smog, and haze. Among them, diesel vehicle exhaust NOx control is an important research content in the field of air pollution control. NH 3 -SCR is currently one of the most promising exhaust gas purification technologies for diesel vehicles. Traditional copper-based medium- and large-pore molecular sieves have poor high-temperature hydrothermal stability, while small-pore molecular sieve-supported catalytic materials have excellent catalytic activity and hydrothermal stability. Therefore, they have attracted the attention of researchers at home and abroad in recent years and become the most promising. NH 3 - SCR catalytic mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J37/10B01J35/10B01J37/08B01J37/30C01B37/08C01B39/54B01D53/94B01D53/56
CPCB01J29/85B01J37/10B01J37/08B01J37/30B01J37/0018C01B37/08C01B39/54B01D53/9418B01J2229/18B01D2251/2062B01D2258/012B01J35/643B01J35/69B01J35/647
Inventor 李涛张守特明淑君陈真
Owner HUAZHONG UNIV OF SCI & TECH
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