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对水热处理后得到的USY沸石作进一步的酸处理以及采用改进的氟硅酸盐溶液骨架富硅工艺,分别得到了经XPS剖面分析证实为铝分布均匀的超稳Y沸石HAY-Ⅰ和HAY-Ⅱ。IR分析表明,在酸处理过程中从USY沸石中去掉的那部分非骨架铝类与3690cm~(-1)处羟基有关,仍残留在HAY-Ⅰ沸石中的那部分非骨架铝类与3670cm~(-1)和3600cm~(-1)处羟基有关。XRD和化学分析表明HAY-Ⅰ沸石仍含有约50％的非骨架铝类,而HAY-Ⅱ沸石则基本上不含非骨架铝类,HAY-Ⅱ沸石还显示更高的结晶保留度。DTA分析表明,HAY-Ⅰ和HAY-Ⅱ两种沸石的热稳定性均高于USY沸石。
The USY zeolite obtained after hydrothermal treatment was further acid-treated and the skeleton of the fluorosilicate solution was enriched with silicon-rich process. The ultrastable Y zeolites HAY-Ⅰ and HAY- II. IR analysis showed that the part of the non-framework aluminum removed from the USY zeolite during the acid treatment was related to the hydroxyl group at 3690 cm -1 and the part of the non-framework aluminum remaining in the HAY- (-1) and 3600cm ~ (-1) at the hydroxyl group. XRD and chemical analysis showed that HAY-I zeolite still contains about 50% of non-framework aluminum, whereas HAY-II zeolite is substantially free of non-framework aluminum, and HAY-II zeolite also shows higher crystallinity retention. DTA analysis showed that the thermal stability of both HAY-I and HAY-II zeolites was higher than that of USY zeolites.