Synthesis of SAPO-11 and AIP0 4-11 molecular sieves in the presence of Cu(ll)

Abstract

The possible incorporation of Cu(II) into SAPO-11 (CuSAPO-11) and AIPO 4-11 (CuAPO-11) by adding Cu(II) compounds during synthesis in the presence of di- n-propylamine or diisopropylamine templates has been assessed. The location of Cu(ll) is identified by electron spin resonance and electron spin echo modulation spectroscopies. Cu(ll) ions do not incorporate into framework positions of SAPO-11 and AIPO 4-11, i.e., Cu(II) in CuSAPO-11 is located in the same position as Cu(ll) introduced byaqueous ion-exchange and Cu(ll) in CuAPO-11 is located in an extraframework position of AlPO 4-11. It is of ancillary interest that in the presence of Cu(ll) the SAPO-5 phase can be obtained as a major product by varying the temperature and time of crystallization.