磷改性的Hβ沸石表面酸性的研究

Studies on the Surface Acid Properties of Phosphorus-Modified Hβ-Zeolite

用离子交换法制备Hβ沸石,然后再用浸渍法制备不同磷含量的Hβ沸石样品,通过XRD、NH3-TPD和FT-IR等手段表征了样品的晶相、酸量及酸性。结果表明,在磷改性的Hβ沸石样品中,磷含量为1%时其酸量略有增加,而磷含量大于1%的Hβ样品其结晶度、酸量下降,酸强度亦下降。

A series of Hβ -zeolite samples were prepared by ionexchange at different calcination temperatures, and then the Hβ - zeolite samples with different phosphorus content were prepared by impregnation method. The crystal phase, surface acid amount and acid properties of the modified samples were charac- terized by means of XRD, Fr - IR and NH3 - TPD. The experimental results showed that when phosphorus content is 1%, the surface acid amount of the prepared samples increased somewhat;however,when phosphorus content is over 1% ,not only the crystallinity and the surface acid amount of the prepared samples but also the acid density decreased with increasing of phosphorus content.