In recent years, the development of photocatalytic desulfurization catalyst has been a hot topic in the field of clean fuel production. The preparation method, structure, properties and catalytic desulfurization performance of pure phase, doped, supported and heterojunction photocatalytic oxidation desulfurization catalysts were studied. Due to the narrow light response range of pure phase catalysts, doped, loaded and heterogeneous junction catalysts have the expanded light wave region by reducing the bandgap width of catalysts. It is pointed out that the supported catalyst can not only expand the range of light wave range, but also increase the specific surface area of the catalyst and then further improve the activity of it. However, the study of low cost carriers and the regeneration performance of photocatalytic oxidation desulfurization catalysts are important research directions in the future.

The carrier of hierarchical porous TiO ₂⁃Al ₂O ₃ and the catalyst Ni ₂P/TiO ₂⁃Al ₂O ₃ were prepared. The catalytic performance of the Ni ₂P/TiO ₂⁃Al ₂O ₃ was compared with the N _i2P loaded on the mesoporous Al ₂O ₃  and γ⁃Al ₂O ₃. The influence of the technological conditions, including reaction temperature, hydrogen oil ratio, mass space velocity and reaction pressure, were investigated by Orthogonal test and single factor exploration, respectively. The optimized technological conditions were obtained. The results showed that the hydrogenation catalyst Ni ₂P/TiO ₂⁃Al ₂O ₃ possessed more excellent de⁃aromatic rate and the selectivity of decahydronaphthalene compared with the ordinary catalyst of Ni ₂P/γ⁃Al ₂O ₃ and Ni ₂P/Al ₂O ₃. For the de⁃aromatic rate and the selectivity of decahydronaphthalene, the reaction pressure and temperature had more significantly affection to the hydrogen / oil ratio and the mass space velocity. According to the results of orthogonal test, the optimum reaction conditions of the hierarchical porous Ni ₂P/TiO ₂⁃Al ₂O ₃ catalyst in the hydrodeaphthalene reaction were investigated. The reaction temperature was 300 ℃, the reaction pressure was 4 MPa, the hydrogen / oil ratio was 500, and the mass space velocity was 1 h-1. The removal rate of naphthalene and the selectivity of decahydronaphthalene reached the highest, which were 99.2% and 72.0%, respectively.

The Y-type zeolites (REY ) with different contents of rare earth ions were prepared by the traditional liquid-phase ion exchange method. The mass transfer kinetics of benzene on the REY zeolite was studied by using frequency response (FR) technique and intelligent gravimetric analyzer (IGA). The effects of the concentration of rare earth ions on the adsorption and diffusion process were studied, and the samples were characterized by XRD, physical analyzer and other characterization methods. The results show that the adsorption capacity decreases with the introduction of rare earth, and the introduction of appropriate rare earth can improve its mass transfer performance, but excessive mass of rare earth decreases the mass transfer performance. The adsorption process of benzene on REY zeolite has different adsorption process. The introduction of rare earth can improve the selectivity of zeolite to adsorbate in the process of catalytic and adsorption separation, so as to improve the efficiency of catalysis and separation.

The modified lignin-based oil removal flocculant containing the dithiocarbamate group, denoted as MLOF, was prepared by chemical modification of alkali lignin, a byproduct from the pulp and paper industry. Then MLOF was adopted to treat the oily wastewater. And the flocculation conditions were optimized. The results show the removal percentages of oil, COD Cr, suspended solid (SS) and colourity of the effluent can reach to 88.2%, 71.5%, 90.5% and 93.7％ respectively under such conditions as 6.7 of the effluent pH value and 35 mg/L of the flocculant dosage etc. Moreover, the comparison tests with various flocculants indicated that the amount of MLOF was little when treated oily wastewater and the flocculation performance of the modified lignin-based oil removal flocculant apparently prevailed over such high-molecular flocculants as polyacrylamide (PAM), polyaluminium chloride (PAC) and polyferric sulfate (PFS) etc. 