Visible light catalyst for removing sulfur-containing compounds in fuel oil, and preparation and use

摘要

This invention relates to a visible-light-responsive photocatalyst for photocatalyticly oxidation desulphurization and method for preparation and application thereof. The catalyst is comprised of one type of metal M_I, one type of metal oxide M_IIO_x and BiVO₄ as the supporter, wherein the mass ratio of the sum of the two types of metal (M_I+M_II) to BiVO₄ is from 1:5000 to 1:50; the mass ratio of the type of metal M_I to the type of metal M_II is from 1:50 to 50:1. The catalyst is used in the photocatalytic oxidation desulphurization. Under mild condition (room temperature, 1 atm), using O₂ as the oxidant and xenon lamp (wavelength 420 nmλ700 nm) as the light source, avoid the oil's absorption of light (mainly in the violet area which is below 420 nm), the desulphurization ratio of thiophene can be above 90%, meanwhile the oil won't be excited. The sulfur in thiophene can be oxidized to SO₃ and absorbed by the absorbent after escaped from the reaction system. Thus extraction of the conventional oxidative desulphurization can be saved to lower the operation cost. The visible-light-responsive photocatalyst can be widely used in oil compared with the UV-light-responsive photocatalyst. We can recover the photocatalyst after the reaction by subsiding or centrifugation.