Preparation method and application of SiO2-APTES-La composite aerogel

A technology of composite airgel and gel method, which is applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems that cannot meet industrial production, poor adsorption selectivity, and reduced adsorption capacity, and meet equipment requirements Low, mild adsorption conditions, and the effect of improving adsorption efficiency

Pending Publication Date: 2021-03-12
ZHEJIANG UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

Therefore, although this kind of adsorbent has a large adsorption capacity, its adsorption selectivity is poor, and it cannot meet the requirements of industrial production.
[0006] The introduction of amino functional groups can improve SiO 2 The adsorption properties of airgel, in which the amino groups can form hydrogen bonds with the sulfur atoms in thiophene sulfides, and the SiO 2 Hybrid cross-linking with APTES, on SiO 2 Surface-introduced-NH 2 Form hydrogen bonds with thiophene sulfides, and on this basis in SiO 2 surface-NH 2 Chelated Ag + , to get SiO 2 -APTES-Ag composite airgel (publication number CN110354809A), although the amino group forms a hydrogen bond with the sulfur atom in the thiophene sulfide (it does not interact with aromatic hydrocarbons and olefins), but the Ag + The introduction of Π is still based on Π complexation, and there will still be a problem of competitive adsorption with aromatics and olefins in real fuel oil, so that when there are aromatics and olefins, the adsorption capacity will decrease

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  • Preparation method and application of SiO2-APTES-La composite aerogel
  • Preparation method and application of SiO2-APTES-La composite aerogel
  • Preparation method and application of SiO2-APTES-La composite aerogel

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Experimental program
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Effect test

Embodiment 1～5

[0029] Embodiments 1 to 5: the molar ratio of silicon lanthanum to SiO in the feed 2 - Effect of APTES-La composite airgel on the adsorption performance of thiophene sulfides in simulated gasoline.

Embodiment 1

[0030] Example 1, SiO with a silicon-lanthanum molar ratio of 10:1 2 The specific preparation method of -APTES-La composite airgel is as follows:

[0031] Add 10mL of absolute ethanol, 8mL of tetraethyl orthosilicate and 2mL of deionized water into a beaker to obtain a mixed solution A, add nitric acid to adjust the pH to 2, stir in a magnetic stirrer for 90min to mix evenly and hydrolyze, then transfer to an ice-water bath Add ammonia water to adjust the pH to 6.8, then add 1mLAPTES, and let stand for 15min to obtain SiO 2 -APTES hybrid alcohol gel; aging for 16h in 40mL of absolute ethanol and tetraethyl orthosilicate mixture with a volume ratio of 25:15 to strengthen the gel skeleton structure; then solvent replacement of the gel with n-hexane , replace the solvent twice within 24 hours to remove ethanol, water and other organic molecules in the gel; then take 1.559g of lanthanum nitrate and dissolve it in 3mL of absolute ethanol to obtain solution B, and add solution B dr...

Embodiment 2～5

[0033] Embodiment 2~5, SiO 2 -In the preparation method of APTES-La composite airgel, the molar ratio of silicon lanthanum to feed is 25:1, 50:1, 100:1, 200:1 in turn, the usage of ethyl orthosilicate is 8mL, lanthanum nitrate The usage amount is respectively 0.624g, 0.312g, 0.156g, 0.078g, and all the other preparation steps are with embodiment 1.

[0034] Table 1 Different molar ratios of silicon lanthanum to SiO 2 Adsorption performance of APTES-La composite airgel for thiophene sulfides in simulated gasoline

[0035]

[0036] As can be seen from Table 1, SiO 2 -APTES-La composite airgel's breakthrough adsorption capacity for thiophene, benzothiophene or dibenzothiophene increases first and then decreases with the decrease of the molar ratio of silicon-lanthanum feed, that is, the increase of lanthanum content. The breakthrough adsorption capacity of thiophene, benzothiophene or dibenzothiophene reached the maximum when the molar ratio of silicon to lanthanum was 50:1...

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Abstract

The invention discloses a preparation method and application of SiO2-APTES-La composite aerogel, and belongs to the technical field of fuel oil processing. The preparation method comprises the steps of mixing absolute ethyl alcohol, tetraethoxysilane and deionized water to obtain a solution A, carrying out magnetic stirring hydrolysis under acidic conditions, adding ammonia water to adjust the pHvalue, slowly adding APTES, standing to obtain a gel, aging, crushing, carrying out solvent replacement to dissolve lanthanum nitrate in absolute ethyl alcohol to obtain a solution B, standing the mixed solution A and the mixed solution B, and drying the mixed solution A and the mixed solution B under normal pressure to obtain the SiO2-APTES-La composite aerogel. According to the invention, a fixed bed adsorption device is quantitatively filled with the SiO2-APTES-La composite aerogel, thiophenic sulfide-containing simulated gasoline is injected at normal temperature and a certain airspeed, the adsorbed simulated gasoline is collected at an outlet at the lower end of a reaction device, and chromatographic analysis is carried out. The preparation method of the SiO2-APTES-La composite aerogel adsorbent is simple, the cost is low, the adsorbent can be repeatedly used, the economic benefit is high, the environment-friendly effect is achieved, the adsorption condition is mild, and the requirement for adsorption equipment is low.

Description

technical field [0001] The invention belongs to the technical field of fuel oil processing, in particular to a SiO 2 - Preparation method and application of APTES-La composite airgel. Background technique [0002] The massive emission of sulfur compounds in fuel oil not only makes environmental pollution more and more serious, but also threatens human health. The sulfur content in the fuel cell also has quite high requirements. The presence of organic sulfide will poison the catalyst in the electrode of the fuel cell, so that the fuel cell cannot effectively convert the chemical energy in the fuel into electrical energy. In order to solve this problem, it is particularly important to produce ultra-low sulfur fuel oil that meets the Euro V standard (<10ppm). [0003] At present, the desulfurization technology of fuel oil mainly includes hydrodesulfurization technology, alkylation desulfurization technology, biological desulfurization technology, extraction desulfurizatio...

Claims

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Application Information

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IPC IPC(8): B01J13/00B01J20/30B01J20/26B01J20/28C10G25/00
CPCB01J13/0091B01J20/28047B01J20/103B01J20/02B01J20/267C10G25/00C10G2300/202
Inventor 宫婉慧张波高建广殷路霞
Owner ZHEJIANG UNIV OF TECH
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