脱铝沸石羟基窝的表征

Quantitative Characterization of "Hydroxyl Nests" Concentration for the Dealuminated Y Zeolite

NH4Y和NaY沸石用草酸溶液脱铝制备的样品，用红外光谱测定了表征“羟基窝”的3710cm-1处的背底吸光度（A3710）．并考察了其热稳定性；用DTA和TGA建立了定量测定“羟基窝”的方法，并测定了各样品的“羟基窝”浓度，样品的“羟基窝”

The method of quantitative determinaltion of 'hydroxyl nests' by DTA and TGA was established. The concentration of 'hydroxyl nests' for NH4Y and NaY zeolites dealuminated with an aqueous oxalic acid solution was determined by snch method. The results indicated that the 'hydroxyl nests' concentration of the dealuninated zeolite sample is compatible with its number of actual dealumination per gram. This shows that after a framework aluminum of zeolite was removed by acid, a 'hydroxyl nests' formed conclusively.