摘要
吡啶和氨常被用作探针分子来表征酸性催化剂的酸性,这对酸碱催化反应的研究及有关催化剂的制备是很有意义的。我们用量热及红外相结合的方法研究了吡啶、氨和苯在超稳Y型沸石(USY)上的吸附,对USY沸石的酸性进行了表征,并试图从分子结构和酸中心性质上来解释它们的吸附热及其碱性之间的关系。
By using a SETARAM m(?)crocalorimeter and a PE-680 IR Spectrophotometcr, the differential heats of adsorption and IR Spectra of pyridine, ammonia and benzene on USY zeolite were measured at room temperature.The initial differential heat of adsorption for pyridine is much greater than that of ammonia. But according to the pKb in Solution, the basicity of ammonia is a little stronger than that of pyiidine. The relationships among their heals of adsorption, basicities and moleculat structures were discussed.
