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

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...

AI Technical Summary

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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