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H-Al-MWW with different Si/Al ratios has been synthesized in the presence of hexamethyleneimine by the postsynthesis method with the ion-exchange of Na + with NH4+ unnecessary. However, irrespective of the framework Si/Al ratio, the as-synthesized Al-MWW lamellar precursor was not transformed into the Al-YNU-1 phase by the method used for preparing Ti-YNU-1 [W. Fan, P. Wu, S. Namaba, T. Tatsumi,...
A novel titanosilicate with the MWW topology, Ti-MWW, has been prepared by direct hydrothermal synthesis using boric acid as a structure-supporting agent, and also by post-incorporation of tetrahedral Ti species into MWW silicalite through controlled structural conversions between three-dimensional crystalline silicalite and the lamellar precursor. Ti-MWW is further converted by delamination into...
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