【摘要】 分别利用0.1mol/L的NH₄Cl和HCl对BETA沸石分子筛进行了离子交换.结果表明,HCl导致了BETA沸石骨架脱铝,而NH₄Cl则对骨架铝无影响.红外光谱的OH振动频率显示出了两个谱峰在3740cm^-1和3610cm^-1处,分别归属于Si—OH和Si（OH）Al基团.吸附吡啶的红外光谱表明,不仅3610cm^-1而且部分的3740cm^-1谱带也显示了较强的酸性.更多还原

【Abstract】 The ion exchanges of zeolite BETA with 0. 1 mol/L NH4C1 and 0. 1 mol/L HCI solutions were performed respectively, and it was shown that the addition of HCl resulted in the dealumination of beta-zeolite framework, while NH4C1 was inactive for the elimination of framework Al. The 1R spectra exhibited the hydroxyl stretching bands at 37 10 cm-1 and 3610 cm-1, which are assigned to Si-OH and Si(OH)Al groups, respectively. Adsorption of pyridine showed that both 3610 cm-1 and a partial 3740 cm-1 species exhibited strong acidic properties.更多还原