Novel crystalline aluminophosphates and related compounds

Crystalline aluminophosphates and related compounds having in the as-synthesized anhydrous form the chemical composition: mR(XnAlqPx)O2, wherein R represents ethylenediamine, X represents one or more elements which can be substituted for Al and/or P, wherein m = 0.01-0.33 n = 0-0.40 q = 0.30-0.60 x = 0.30-0.60 and wherein n + q + x = 1 and which have a distinct X-ray diffraction pattern. The compounds can be prepared from a forming solution or gel comprising a source of aluminium, a source of phosphorus, a source of ethylenediamine and optionally a source of at least one component X, wherein the appropriate forming components are initially present in specific molar ratios and which mixture is kept at elevated temperature for a period of time sufficient to produce a crystalline aluminophosphate or related compound followed by separating off the crystalline product obtained and drying, and which may subsequently be calcined.