| Summary: | 碩士 === 東吳大學 === 化學系 === 104 === Supporting copper over titanium dioxide as active catalysts for steam reforming of methanol (SRM) is investigated the effect of crystalline over catalytic ability, by changing crystallites of titania with rutile, anatase and mix-phase. The interfaces between copper ions (Cu0-1) with titania provide active sites for SRM reaction. And oxygen vacancies of titania not only improves the reduction of copper oxides but supplies oxygen atoms to yield intermediate, that all proposed can enhance the catalytic activity of SRM reaction.
The crystallite types of titania can be characterized by powder X-ray diffraction (PXRD) and the nano-structure can observed with scanning electron microscope (SEM). The pore size, surface area and its varying tendency with different copper oxide loadings can be measured by N2-adsortpion-desorption isotherms. Using temperature-programmed reduction technique to analyze the boning structure and reductive properties of copper oxide over titania surface. The influences of titania crystallites on catalytic activity in various temperatures can be studied with gas chromatography–mass spectrometry.
According research, titania within rutile crystallite exhibits higher surface area compared other supports with anatase and mix-phase, that would be beneficial for reaction activity. However, the series catalysts with mix-phase titania, due to their harmonization of oxygen store/release ability between titania crystallites, it’s more useful to yield intermediates and that indeed promotes catalytic activity of SRM reaction.
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