Microemulsion Reaction Of Ultrafine Iron And Copper Catalysts And Their Activity Evaluation

Higher alcohol composed from syngas can be not only clean fuels, but also can be separated as single alcohols for further utilization, so it has important industrial value.Alcohols can be synthesized on Fe-Cu-based catalyst at low temperature and mild operation condition, which is made with low cost and shows high catalytic performance. Superfine catalysts have much greater catalytic activity and selectivity because of their unique crystal structure and surface properties, therefore, microemulsion system prescription is ascertained with conductivity method, superfine particles are prepared in an oil-water two-phase microemulsion system, superfine catalysts are prepared by means of impregnation in this thesis.To prepare the microemulsion, Dodecylbenzenesulfonic acid Sodium(DBS), methylbenzene, butanol are used as surfacetant(S), oil phase(O), consurfactant(A) respectively. From the conductivity measurements of different microemulsion samples, we investigate that Dodecylbenzenesulfonic acid Sodium Microemulsions has an largest ability to solubilize when V(A)/V(O)=0.25 and m(A)/m(S)=1.50, and the critical constitute is wider, preparation of superfine material is suitable.The best technical condition: M_DBS =5.365±0.005 g (for the preparation of Fe₂O₃) or M_dbs =8.062+0.005g (for the preparation of CuO) , V(W)/V(O)=1: 1.5, Concentration of the salt=0.10 mol/L, Volume of precipitator < Volume of theoretics, Reaction temperature=30 ℃,pH =2.0².8; TG-DTA, XRD, H₂-TPR, FT-IR spectroscopy and particle size analysis are used to characterize their microstructure, the amorphous superfine Fe₂O₃ (17.1nm) with a narrow size distribution and pin-shape CuO(6.65μm ) are obtained. Theirs H₂-TPR reduction peaks temperature are lower than the common precipitation samples obviously, the component of the powders usher are FeOOH and CuOOH respectively, Fe₂O₃ will be obtained through Fe₃O₄ with the hoisting of the calcination temperature, but meanwhile, crystallization phenomenon is in evidence, the best calcinationtemperature is 400 °C ; CuO will be obtained through Q12O also, aggregation phenomenon is serious with the hoisting of the calcination temperature, and the best calcination temperature is 350 °CImpregnation superfine catalyst shows high activity and good selectivity. The dissertation explored the optimum process conditions after examining the effect of the experiment condition and acid promoters ,which was at T= 360³80 "C, P=4.0 MPa, 5^=10000 h"1' Content of A12O3= 88.61 wt%; the function of main promoter K(1.60 wt%) is thought to improve the yield of total alcohol (0.25 g-mU1 -h'1) and the selectivity of C2+OH( 58.83 wt%).