The Adsorption of Alkyl Aldehydes on Cations Supported by Layer Silicate. Complex Formation Theory

[摘要] Adsorption mechanism of alkyl aldehydes, acetaldehyde, acrolein, and crotonaldehyde on cations supported by layer silicates was studied by means of IR spectroscopy and X-ray. An analysis of four characteristic split bands in the region of 1720~1580cm-1 was made. The carbonyl stretching band which shifted about 130cm-1 to lower frequencies was observed only for Ni2+ and Al3+ but slightly with Ca2+ at high sample temperature and was attributed to >C=O¡¦M complex formation. A sharp band which appeared as a shoulder at 1722 for acetaldehyde and 1690 for acrolein and crotonaldehyde was responsible for the interaction of carbonyl with surface hydroxyl. The second broad band which appeared at about 1710~1660 was responsible for hydrogen bonding between carbonyl oxygen and cationic hydroxyl group. The third band which appeared at about 1640~1660 was attributed to induced >C=C< double bond due to the strong carbonyl interaction. This was supported by the interlamellar spacings obtained by X-ray diffractometry.

[学科分类] 化学（综合）