Phase transfer catalyst for oxidative desulfurization of activated carbon supported heteropolyacid quaternary ammonium salt diesel and preparation method of phase transfer catalyst

Abstract

The invention discloses a phase transfer catalyst for oxidative desulfurization of activated carbon supported heteropolyacid quaternary ammonium salt diesel and a preparation method of the phase transfer catalyst. The catalyst is prepared from an activated carbon carrier and a heteropolyacid quaternary ammonium salt active component, wherein the content of the heteropolyacid quaternary ammonium salt is 20-40% of the content of the activated carbon; the aperture of the catalyst is 1-2nm; the specific surface area of the catalyst is 500-700 m<2> / g. According to the invention, the activated carbon is taken as a support, and the heteropolyacid quaternary ammonium salt is taken as an active component, so as to prepare the phase transfer catalyst for oxidative desulfurization for the diesel, so that the defects that a non-supported phase transfer catalyst is fine in particles, low in specific surface area, and not easy to recycle are overcome. The heteropolyacid quaternary ammonium salt is supported on the activated carbon by adopting a two-step impregnation method. Firstly, heteropolyacid is supported to the activated carbon, and then reacts with the quaternary ammonium salt, so as to prepare the supported heteropolyacid quaternary ammonium salt phase transfer catalyst. The obtained catalyst is high in specific surface area; the active components are high in dispersity on the support, easy to separate and recycle, and less in oil loss. Thus, the diesel efficiency and the desulphurization rate are improved.

Description

1. Technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to an active carbon-loaded heteropolyacid quaternary ammonium salt diesel oil oxidation desulfurization phase transfer catalyst and a preparation method thereof. 2. Background technology [0002] Although catalytic oxidation desulfurization is a typical non-hydrogenation desulfurization method, due to the immiscibility of the oxidant system and the oil system, the effective mixing degree of the oxidant in the water phase and the sulfur-containing compound is poor, and the oxidation reaction only occurs in the water phase-organic phase. At the interface, it not only affects the desulfurization rate but also affects the yield of diesel oil. [0003] Heteropolyacid quaternary ammonium salts are hydrophilic and lipophilic, and also have strong acidity and strong oxidizing properties, which can effectively solve the above problems. However, the heteropolyacid quaternary...

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Problems solved by technology

[0004] The heteropoly acid quaternary ammonium salt phase transfer catalyst is solid and cannot be directly loaded on the activated carbon, so the heteropoly acid is loaded on the activated carbon first, and then reacted with the quaternary ammonium salt to prepare the supported heteropoly acid quaternary ammonium salt phase transfer catalyst At present, there is no report on the related research on the preparation of activated carbon-supported heteropolyacid quaternary ammonium salt phase transfer catalyst by two-step method.