The influence of preparation conditions on the surface hydroxyl properties of pseudo boehmite
A continuous method was used to prepare pseudo boehmite,and corresponding orthogonal experiments were designed to investigate the effect of preparation conditions on the surface hydroxyl prop-erties of pseudo boehmite.The types and contents of surface hydroxyl groups in the obtained samples were analyzed by infrared spectroscopy and other methods.The results show that the synthesis conditions have a significant impact on the proportion of hydroxyl groups,especially the range of type Ⅲ hydroxyl groups(neutral)with the highest value 94.61％of N-4 and the lowest 31.84％of N-16.The change in hydroxyl peak area leads to varying degrees of shift in the position of the hydroxyl peak,which is generally manifested as a decrease in the 3 680 cm-1 peak and/or 3 730 cm-1 peak,and an increase in the 3 730 cm-1 peak and/or 3 790 cm-1 peak.
catalyst engineeringcontinuous methodpreparation conditionspseudo-boehmitesurface hydroxyl group
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