Abstract: Using H3PO3 as the phosphorus source is a new route to prepare SAPO-41 and AlPO-41 molecular sieves. However, it needs a long crystallization period for the formation of these AFO structure materials. In the present communication, effects of the addition of H2O2 and H3PO4 on the synthesis of SAPO-41 and AlPO-41 have been investigated. The addition of either H2O2 or H3PO4 can promote the crystallization of AlPO-41 and SAPO-41. Besides, SAPO-41 has been obtained with the crystal size smaller than 10 μm at lower di-n-propylamine concentration when the mixture of H3PO3 and H3PO4 is used as the phosphorus source.

Key words: molecular sieve, SAPO-41, AlPO-41, hydrogen peroxide, phosphorous acid, phosphoric acid