Patent ID: 7517825
Filing Date: 2009-04-14
Classification: C07C,Y02P

Abstract:
1. A process for producing a modified Y zeolite, comprising: a) treating a Y zeolite with an aqueous solution of a fluorosilicate salt to give a first LZ-210 zeolite having a first bulk Si/Al b) hydrothermally steaming the first LZ-210 zeolite at a temperature of from about 550° C. to about 850° C. to produce a second LZ-210 zeolite having a bulk Si/Al c) contacting the second LZ-210 zeolite, with a sufficient amount of an aqueous solution of ammonium ions having a pH of less than about 4 for a sufficient time to exchange at least some of the sodium cations in the second LZ-210 zeolite for ammonium and hydrogen ions; and d) producing a modified LZ-210 zeolite having a second bulk Si/Al