Solid-state synthesis of aluminophosphate-based zeotypes from conventional amorphous precursors: Strategy and catalytic performance

Exploring novel strategies for the preparation of zeolitic materials with high performance continues to be of great significance. Here we report a general solid-state approach for fabricating aluminophosphate (AlPO)-based zeotypes by directly calcining conventional amorphous precursors at 300 °C for just 30 min. Accordingly, AEL, AFI, LTA and CHA types of AlPO-based zeotypes with high crystallinity and similar textural properties to those of counterparts made by established synthesis approaches have been synthesized. As a demonstration, the catalytic performance of Mg-substituted AlPO-11 (S-MgAlPO-11) in hydroisomerization of n-hexadecane (n-C₁₆) was also investigated. Compared with the Pt supported on conventional MgAlPO-11 (Pt/C-MgAlPO-11) catalyst, the Pt/S-MgAlPO-11catalyst exhibits higher isomerized (87 % vs. 84 %), multi-branched C₁₆ (48 % vs. 30 %) yields and superior reaction stability, attributing to the improved diffusion property and appropriate metal-acid balance. This strategy provides an efficient approach to synthesis promising zeolitic catalysts for industrial applications.