Method for accelerating CHA structural molecular sieve synthesis and application of catalyst to NH3-SCR reaction
An SCR catalyst and molecular sieve technology, which is applied in the field of catalytic reduction and purification of nitrogen oxides in vehicle exhaust, can solve the problems of long synthesis period of molecular sieve and uneven distribution of catalyst active components, shorten the hydrothermal synthesis time, shorten the synthesis period, and improve the sol The effect of nature
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment example 1
[0042] (1) Preparation of molecular sieve carrier:
[0043] First, weigh 18.2g of sodium metaaluminate and configure it as a molecular sieve crystallization solution, and add 0.074g of ammonium fluoride (NH 4 F) and 0.165g tetraethylammonium chloride (TEAC), and 0.02g SAPO-34 molecular sieve raw powder. Stir evenly to form a composite sol-gel.
[0044] The above composite sol-gel was placed in a magnetically coupled mechanically stirred reactor, and reacted at 180 ° C for 2 h in a stirring state; at 150 ° C for hydrothermal synthesis for 12 h; After moving 3 times, let it stand at constant temperature for hydrothermal synthesis for 4 hours. After the hydrothermal synthesis, the molecular sieve precursor was centrifuged, washed, dried, and roasted in sequence to obtain the product, marked as ①, and the crystal structure characterization (XRD spectrum) is shown in figure 1 , it can be seen from the figure that the product has a characteristic diffraction peak belonging to a m...
Embodiment example 2
[0048] (1) Preparation of molecular sieve carrier:
[0049] First, weigh 100g aluminum sol (25% solid content, acidic) to configure molecular sieve crystallization solution, add 0.25g potassium nitrate (KNO 3 ) and 0.075g triethylamine (TEA), and 0.02g SAPO-34 molecular sieve former powder. Stir evenly to form a composite sol-gel.
[0050] The above composite sol-gel was placed in a magnetically coupled mechanically stirred reactor, and reacted at 180 ° C for 2 h in a stirring state; at 150 ° C for hydrothermal synthesis for 12 h; After moving 3 times, let it stand at constant temperature for hydrothermal synthesis for 4 hours. After the hydrothermal synthesis, the molecular sieve precursor was centrifuged, washed, dried, and roasted in sequence to obtain a molecular sieve with a CHA structure, marked as ②, and its relative crystallinity is shown in Table 1.
[0051] (2) Preparation of molecular sieve SCR catalyst:
[0052] Take the above 10g of molecular sieve with CHA st...
Embodiment example 3
[0054] (1) Preparation of molecular sieve carrier:
[0055] First take by weighing 375.13g aluminum nitrate and configure molecular sieve crystallization liquid, add 4.2g potassium phosphate (K 3 PO 4 ) and 0.026g tetrabutylammonium hydroxide (TBAH), and 0.02g SAPO-34 molecular sieve former powder. Stir evenly to form a composite sol-gel.
[0056] The above composite sol-gel was placed in a magnetically coupled mechanically stirred reactor, and reacted at 180 ° C for 2 h in a stirring state; at 150 ° C for hydrothermal synthesis for 12 h; After moving 3 times, let it stand at constant temperature for hydrothermal synthesis for 4 hours. After the hydrothermal synthesis, the molecular sieve precursor was centrifuged, washed, dried, and roasted in sequence to obtain a molecular sieve with a CHA structure, marked as ④, and its relative crystallinity is shown in Table 1.
[0057] (2) Preparation of molecular sieve SCR catalyst:
[0058] Take the above 10g of molecular sieve wi...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More - R&D
- Intellectual Property
- Life Sciences
- Materials
- Tech Scout
- Unparalleled Data Quality
- Higher Quality Content
- 60% Fewer Hallucinations
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com