Refineries, especially fluid catalytic cracking (FCC) units are required to increase propylene production because of changing demand from fuels to chemicals in recent years. We have found a promising FCC catalyst for such demand. The FCC catalyst with Al ion-exchanged USY zeolite (catalyst (Al)) has indicated the higher LPG yield without decreasing in the activity. The catalyst (Al) would be suppressing hydrogen transfer reactions between products or intermediates. Moreover, the olefins in the gasoline would be over-cracked to LPG over catalyst (Al) because of strong acidity of Al ion-exchanged USY.

中文翻译：

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FCC 催化剂中的铝离子交换 USY 提高 LPG 收率

由于近年来从燃料到化学品的需求不断变化，炼油厂，尤其是流化催化裂化 (FCC) 装置需要增加丙烯产量。我们已经找到了满足这种需求的有前途的 FCC 催化剂。带有 Al 离子交换 USY 沸石（催化剂 (Al)）的 FCC 催化剂显示出更高的 LPG 产率，而不会降低活性。催化剂 (Al) 将抑制产品或中间体之间的氢转移反应。此外，由于铝离子交换的 USY 具有强酸性，汽油中的烯烃会在催化剂 (Al) 上过度裂解为 LPG。