Template removal from AFI aluminophosphate molecular sieve by Pd/SiO2 catalytic hydrocracking at mild temperature
Pd/SiO 2 catalytic hydro-cracking is applied to remove triethylamine template in an AFI type MnMgAlPO-5 molecular sieve . The triethylamine template reacts with spillover hydrogen inletting from the Pd/SiO 2 catalyst, and is hydro-cracked to small molecules at a mild temperature (613 K). This behavior is distinguish to the conventional template removal method of calcination above 823 K, and consistently proved by H 2 -TPR/MS, TG/MS, and N 2 -isotherms results. The catalytic hydro-cracking method does not damage the crystal structure of MnMgAlPO-5, indicated by XRD characterization. Its novelty is suggested as reserving the local symmetric structure of MnMgAlPO-5 ( i.e. , keeping framework Mn and Mg), consistently verified by EPR, UV–vis, and Raman spectra. This provides an alternative option for the template removal from molecular sieves.
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