Method for preparing silicon-aluminium denitrfying agent

A silicon-aluminum denitrification agent and silicon raw material technology, which is applied in the field of purification, can solve the problems of insufficient concentration of the pore size distribution of the silicon-alumina denitrification agent and the reduction of sol generation rate, and achieve the effect of easy regeneration and high specific surface area

Active Publication Date: 2010-10-27
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the method for preparing silicon-aluminum denitrification agent in the prior art, the generation rate of sol is reduced due to the inability to accurately control hydrolysis and gelation, and the pore size distribution of the prepared silicon-aluminum denitrification agent is not concentrated enough problem, and then provide a method for preparing a silica-alumina denitrification agent that can accurately control the generation of silica-alumina hydrolysis sol, and ensure that it is fully hydrolyzed into a gel and has a relatively high micropore pore size distribution ratio

Method used

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  • Method for preparing silicon-aluminium denitrfying agent
  • Method for preparing silicon-aluminium denitrfying agent

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh 20.0g of aluminum isopropoxide and add it to 200g of water, heat to 83°C for 0.5 hour for hydrolysis, then use 1.9g of nitric acid for degumming, hydrolyze for 3 hours at 90°C, and produce product W1 after cooling.

[0023]Weigh 138.7g of tetraethyl orthosilicate, add 80.0g of absolute ethanol, stir for 10 minutes, then add 150.0g of ethanol and water mixed solution with a volume ratio of 1:1, adjust the pH value of the above solution to 3 with nitric acid, Stirring for 1 hour yielded product W2.

[0024] The product W1 and the product W2 were mixed and stirred, and the pH value of the above mixed sol was adjusted to 5.9 with 25% ammonia water to obtain the product W3, and the above product W3 was aged at 50°C for 1d; The product was dried under reduced pressure at 30° C. for 3 days, and baked at 500° C. for 5 hours after molding to obtain denitrification agent product B1 with an alumina content of 10 wt % and a silica content of 90 wt %.

[0025] The test shows ...

Embodiment 2

[0027] Weigh 40g of aluminum isopropoxide and add it to 400g of water, heat to 85°C for 1.0 hour for hydrolysis, then use 3.8g of nitric acid for degumming, hydrolyze for 2.5 hours at 91°C, and produce product W1 after cooling.

[0028] Weigh 142.85g of tetraethyl orthosilicate, add 85.0g of absolute ethanol, stir for 10 minutes, then add 158.0g of ethanol and water mixed solution with a volume ratio of 1:1, adjust the pH value of the above solution to 3 with nitric acid, Stirring for 1 hour yielded product W2.

[0029] The product W1 and the product W2 were mixed and stirred, and the pH value of the above mixed sol was adjusted to 6.1 with 20% ammonia water to obtain the product W3, and the above product W3 was aged at 55 ° C for 2 days; the above-mentioned aged The product was dried under reduced pressure at 40° C. for 2 days, and baked at 550° C. for 4 hours after molding to obtain denitrification agent product B2 with an alumina content of 19.5 wt % and a silica content of...

Embodiment 3

[0032] Weigh 68.7g of aluminum isopropoxide and add it to 847g of water, heat to 86°C for 1.5 hours for hydrolysis, then use 5.7g of nitric acid for degumming, hydrolyze for 2.0 hours at 93°C, and produce product W1 after cooling.

[0033] Weigh 138.7g of tetraethyl orthosilicate, add 83g of absolute ethanol, stir for 10 minutes, then add 150g of ethanol and water mixed solution with a volume ratio of 1:1, adjust the pH value of the above solution to 3 with nitric acid, stir for 1 hours, the product W2 is formed.

[0034] The product W1 and the product W2 were mixed and stirred, and the pH value of the above mixed sol was adjusted to 6.0 with 15% ammonia water to obtain the product W3, and the above product W3 was aged at 60 ° C for 2 days; the above-mentioned aged The product was dried under reduced pressure at 45° C. for 1 day, and baked at 580° C. for 3.5 hours after molding to obtain denitrification agent B3 with an alumina content of 35 wt % and a silica content of 65 wt ...

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Abstract

The invention relates to a method for preparing a silicon-aluminium denitrfying agent. The method for preparing the silicon-aluminium denitrfying agent needs to respectively prepare a silica sol and an aluminium sol, then mix the two sols, regulate a pH value of the mixed sol, carry out ageing on the sol the pH value of which is regulated and finally carry out decompression drying and roasting onan aged gel product. The denitrfying agent prepared by the method has more suitable acid center and has stronger selectivity for basic nitrogen compounds. Moreover, the denitrfying agent prepared by using the method for preparing the silicon-aluminium denitrfying agent has 99.9 percent of removal rate for trace amount of nitrides and a great amount of nitrides. The more important point is that when the denitrfying agent realizes the high denitrification rate, the nitrogen-absorption capacity of the denitrfying agent can also reach 2.1 percent.

Description

technical field [0001] The invention relates to a preparation method of a silicon-aluminum adsorption denitrification agent, in particular to a denitrification agent which can be used for adsorption and denitrification of catalytic diesel oil, and belongs to the technical field of purification. Background technique [0002] Diesel fuel is the most important power fuel in developing countries. It has high thermal power efficiency, low fuel specific consumption, and is relatively economical. high share. In the actual use process, the requirements for diesel performance are mainly divided into the following aspects: (1) ignitability, to ensure that diesel has a high and suitable cetane number through treatment; (2) evaporability, that is, to ensure that diesel oil It has a suitable light distillate, which ensures that the diesel has good startability (easy to burn) and at the same time does not cause knocking; (3) higher freezing point, the freezing point of diesel oil is clos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30C10G25/00
Inventor 汪祥胜荆军航韩崇文陈艳春梁永辉
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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