| abstract |
The present invention provides a process for preparing a mixture comprising: (1) providing a mixture comprising at least one source of YO 2 , at least one source of X 2 O 3 , and a terminus having a CHA framework; Preparing a zeolite material having a CHA-type skeleton structure comprising YO 2 , X 2 O 3 and optionally Z 2 O 5 , comprising crystallizing the mixture obtained in step (1); and Wherein the CHA skeleton of the end group comprises YO 2 , X 2 O 3 and optionally Z 2 O 5 , wherein Y is a tetravalent element, Wherein X is a trivalent element, Z is a pentavalent element, optionally one or more Z 2 O 5 sources are provided in step (1), and the CHA skeleton of the terminus contains Z 2 O 5 The said seed has a molar ratio of YO 2 : X 2 O 3 of 5 or more. |