초록 ▼

Binderless particles of zeolite L of very high mechanical strength are prepared by a process which comprises forming a mixture by reacting substantially binderless particles of zeolite L, preferably as shaped particles such as extrudates, with an aqueous alkaline solution containing sources of alkal

Binderless particles of zeolite L of very high mechanical strength are prepared by a process which comprises forming a mixture by reacting substantially binderless particles of zeolite L, preferably as shaped particles such as extrudates, with an aqueous alkaline solution containing sources of alkali metal, at least 50 mole % of which is potassium, and aluminium to obtain the desired particles of very high mechanical strength. The zeolite L thus obtained can form part of a dehydrocyclisation and/or isomerisation catalyst.

대표청구항 ▼

[ I claim:] [1.] A process for preparing particles of Zeolite L of improved mechanical strength comprising:(a) providing binderless preformed particles of Zeolite L, said particles prepared by reacting silica-bound particles containing preformed Zeolite L crystallites present in said silica-bound pa

[ I claim:] [1.] A process for preparing particles of Zeolite L of improved mechanical strength comprising:(a) providing binderless preformed particles of Zeolite L, said particles prepared by reacting silica-bound particles containing preformed Zeolite L crystallites present in said silica-bound particles at a level of up to 95 wt % with an alkaline solution containing a source of alumina to convert the silica binder to Zeolite L; and(b) reacting said binderless preformed particles with an aqueous alkaline solution containing a source of alkali metal, at least 50 mole % of which alkali metal is potassium, and aluminum present in said solution at a molar ratio of aluminum, expressed as Al.sub.2 O.sub.3, to water of at least 0.0015.