| Summary: | 碩士 === 國立中央大學 === 化學工程研究所 === 88 === Abstract
Ultrafine catalysts had good activity owing to their isotropic and amount surface atoms. But those nanoparticles were agglomerated for van der wall force and their adhesion to the metallic surface of the reactor wall. Therefore, the agitation of liquid reaction was increased for high stirring speed to make nanoparticles dispersed well and overcome external mass transfer.
The effects of inert solids such as alumina, silica, zirconia and charcoal activated in liquid hydrogenation were discussed in this paper. The rule of solid in liquid hydrogenation were research by varied some parameters such as compounds of solid, agitated speed, solvent and different reactions.
The enhancement of inert solid was find significantly in nitrobenzene hydrogenation when solvent was cyclohexane. The enhancements of solids were listed: alumina> silica> zirconia> charcoal activated. The optimum weight ratio of Al2O3/Ni-B was 10 and SiO2/Ni-B was 7.5.
For farther research for effect of agitated speed, the best enhancement of inert solid was existed in low agitated speed. The conversion was average increased over 100 %, and maximum enhancement was 281 %. But high-agitated speed had low enhancement, the conversion only increased for 55 %.
When changed solvent as methanol, the enhancement of inert solid was not existence even had disutility. The enhancement of inert solid also was exited in furfural selectivity hydrogenation. Both high-agitated speed and low-agitated speed in furfural hydrogenation, the enhancement of inert solid was distributed in 60 %~ 80 %.
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