Rapid Synthesis of Hollow ZnS Sub-Microspheres Via Microwave Heating and Their Opitical Properties
Hollow ZnS sub-microspheres were synthesized from ZnAc2·2H2O and S powder via microwave heating.The N,N-dimethylformamide(DMF) was selected as solvent.The structure and morphology of the products were characterized by the X-ray powder diffraction,scanning electron microscopy,transmission electron microscopy and high-resolution transmission electron microscopy.The results show that the products obtained are monodispersed hollow sub-microspheres composed of small nanoparticles with the size of 3-4nm.In addition,the reaction process and the effect of the products were discussed.The optical properties of the products were also investigated using UV-vis spectrophotometer and fluorescence spectrophotometer.
One of the fundamental steps to the successful operation of biomass gasification technologies for power generation is the efficiency of the gas cleaning step. Catalytic cracking is selected as the hot gas cleaning technology for this research using zeolite HZSM-5 catalyst in order to reduce tar produced from palm shells gasification in the laboratory scale fixed bed gasifier. The catalyst load of 2, 5 and 10 weight % of the weight of palms shells has been tested in experiment. Gas chromatographic analysis of the tar produced has been conducted along with the study of biomass gasification index (BGI), emissions of CO, NO, and SO2. Furthermore, suitable correlations for the tar removal cleanup for syngas derived from biomass palm shells at different operating parameters when using HZSM-5 catalyst have been developed from the interpolation of the experimental data obtained.