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Modified composite molecular sieve catalyst and preparation method thereof

A composite molecular sieve and molecular sieve technology, applied in the direction of molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problems of high cost and not suitable for wide application in general occasions, and achieve high production efficiency and finished product pass rate, High photocatalytic activity and visible light response range, and the effect of expanding the spectral response range

Pending Publication Date: 2022-08-02
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the added Ag makes the cost better, and it is not suitable for wide application in general occasions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a modified composite molecular sieve catalyst, comprising the following steps:

[0030] Step S1, molecular sieve pretreatment: HZSM-5 molecular sieve, ZSM-23 molecular sieve, MCM-41 molecular sieve are respectively roasted to remove the impurities of their physical adsorption, pulverized, and ready for use;

[0031] Step S2, molecular sieve compounding: mechanically mix HZSM-5 molecular sieve, ZSM-23 molecular sieve, and MCM-41 molecular sieve, add pseudo-bore aluminum, extrude into strips on an extruder, air dry naturally, and dry at 120° C. to constant weight , and then calcined at 450 °C for 3 hours to obtain a composite molecular sieve;

[0032] Step S3, composite molecular sieve loading: add the composite molecular sieve, ammonium borate, diammonium phosphate, hafnium source, gallium source, titanium source, and M source prepared in step S2 into ethanol, stir for 0.6 h, then slowly add sodium acetate, and then Stir vigorously for 2 hours, t...

Embodiment 2

[0041] A preparation method of a modified composite molecular sieve catalyst, comprising the following steps:

[0042] Step S1, molecular sieve pretreatment: HZSM-5 molecular sieve, ZSM-23 molecular sieve, MCM-41 molecular sieve are respectively roasted to remove the impurities of their physical adsorption, pulverized, and ready for use;

[0043] Step S2, molecular sieve compounding: mechanically mixing HZSM-5 molecular sieve, ZSM-23 molecular sieve, and MCM-41 molecular sieve, adding pseudobore aluminum, extruding into strips on an extruder, naturally air-dried, and drying at 135 ° C to constant weight , and then calcined at 500 °C for 3.5 hours to obtain a composite molecular sieve;

[0044] Step S3, composite molecular sieve loading: add the composite molecular sieve, ammonium borate, diammonium phosphate, hafnium source, gallium source, titanium source and M source prepared in step S2 into ethanol, stir for 0.8h, then slowly add sodium acetate, and then Stir vigorously fo...

Embodiment 3

[0051] A preparation method of a modified composite molecular sieve catalyst, comprising the following steps:

[0052] Step S1, molecular sieve pretreatment: HZSM-5 molecular sieve, ZSM-23 molecular sieve, MCM-41 molecular sieve are respectively roasted to remove the impurities of their physical adsorption, pulverized, and ready for use;

[0053] Step S2, molecular sieve compounding: mechanically mix HZSM-5 molecular sieve, ZSM-23 molecular sieve, and MCM-41 molecular sieve, add pseudobore aluminum, extrude and shape on an extruder, air dry naturally, and dry at 140° C. to constant weight , and then calcined at 580 °C for 4 hours to obtain a composite molecular sieve;

[0054] Step S3, composite molecular sieve loading: add the composite molecular sieve, ammonium borate, diammonium phosphate, hafnium source, gallium source, titanium source and M source prepared in step S2 into ethanol, stir for 0.9h, then slowly add sodium acetate, and then Stir vigorously for 2.5h, then tran...

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PUM

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Abstract

The invention discloses a preparation method of a modified composite molecular sieve catalyst. The preparation method comprises the following steps: S1, pretreating a molecular sieve; s2, compounding a molecular sieve; s3, loading the composite molecular sieve; and S4, surface modification. The invention also discloses the modified composite molecular sieve catalyst prepared by the preparation method of the modified composite molecular sieve catalyst. The modified composite molecular sieve catalyst disclosed by the invention is high in photocatalytic activity, wide in visible light response range, good in stability and long in service life.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a modified composite molecular sieve catalyst and a preparation method thereof. Background technique [0002] Molecular sieve materials are widely used in the fields of adsorption, ion exchange, heterogeneous catalysis and the carrier of various guest molecules due to their rich topological diversity and wide range of internal pore size distribution. The material has high chemical stability and adjustable adsorption capacity, and can transmit most of the visible and ultraviolet light. The rich and regular micropore and cage structure make it have a large specific surface. higher application prospects. [0003] Molecular sieves mainly include microporous molecular sieves and mesoporous molecular sieves, both of which have their advantages and disadvantages. In order to combine their advantages, composite molecular sieves came into being and received widespread attention. Compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J29/70B01J29/80B01J37/10C02F1/30C02F101/34
CPCB01J31/0274B01J31/0275B01J29/005B01J29/80B01J37/10C02F1/30B01J29/40B01J29/0308B01J29/041B01J29/7046B01J2229/20B01J2229/40B01J2229/42C02F2101/34C02F2101/345C02F2305/10B01J35/39Y02P20/52
Inventor 章芬胡银陈伟王玲玲韩飞
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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