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ABSTRACT: In this research, nanometer TiO2–Al2O3 composite powders were synthesized by the gas-phase oxidation of TiCl4 and AlCl3 in a high temperature tubular aerosol flow reactor. The measurement of EDS, XPS, XRD and TEM were used to characterize the chemical composition, crystal structure, and size of the particles. The crystal structure of titania and alumina in composite particles was affected by the AlCl3 and TiCl4 feed ratio. Aluminum titanate was formed when residence time was 1.73 s, reaction temperature was 1400°C, and AlCl3 and TiCl4 feed ratio was 2.80. The effect of processing parameters on the particle size and distribution of composite particles was studied. As the preheating temperature of oxygen increased, average particle size of the composite particles became smaller and size distribution more uniform. Enhancement of flow rate of cooling gas injected into reactor tail was benefit controlling the particle size. The composite particle size increased, respectively, with increasing reaction temperature and residence time.
Chemical Engineering Journal.
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ABSTRACT: In this paper, a new method to synthesize ultrafine SnO2–TiO2 coupled particles is presented. The coupled particles are synthesized by homogeneous precipitation and characterized by EDS, XRD, TEM, HREM and BET surface area analysis. The coupled particles, pure ultrafine TiO2, commercial TiO2, and pure SnO2 are employed for photocatalytic degradation of azo dye active red X-3B in aerated solution. The results show that a very rapid and complete decolorization of the azo dye can be achieved, and the photoactivity of the coupled particles is higher than that of pure ultrafine TiO2 and commercial TiO2 particles, and the optimum loading of SnO2 on TiO2 is 18.4%. The enhanced degradation rate of X-3B using SnO2–TiO2 coupled photocatalysts is attributed to increased charge separation in these systems.
Materials Chemistry and Physics 62(1):62-67. · 2.23 Impact Factor
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ABSTRACT: The alkylation of toluene with 1, 3-pentadiene to produce pentyltoluene was carried out to obtain 2, 6-dimethylnaphalene, which is an important intermediate during the production of 2, 6-naphthalene dicarboxylic acid. Based on our previous work using anhydrous AlCl3 as catalyst, [bupy]BF4-AlCl3 ionic liquids were employed to catalyze the reaction of 1, 3-pentadiene with toluene. The experimental results show that [bupy]BF4-AlCl3 ionic liquids are suitable for the reaction especially when the molar ratio of AlCl3 to [bupy]BF4 is 1.75 : 1, and the reaction could proceed at the temperature as low as 0°C. It could be as active as pure AlCl3, but much more environmentally friendly.
Chinese Journal of Chemical Engineering.
