A new strategy to generate strong basic sites on neutral salt KNO_3 modified NaY

摘要

A new strategy was introduced to decompose KNO_3 and generate strong basic sites at the temperature as low as 723 K and the base strength (H_-) of 15.0-18.4 was measured on KNO_3/NaY composites. The basic sites produced were further characterized by FTIR, CO_2-TPD and titration of basicity. The redox interaction between loaded KNO_3 and methanol was proved to be accounted for the generation of basic sites on KNO_3/NaY composites and the interaction pathway was proposed by evacuated FTIR and TG/MS. In comparison with the conventional thermal approach, the redox process could also suppress the release of NO_x from KNO_3 decomposition according to the results of the colorimetric method and TG/MS. In addition, solid bases KNO_3/NaY were firstly employed to catalyze the vapor phase methylation of cyclopentadiene (CPD). The basic sites generated through the interaction between KNO_3 and methanol were catalytically active for CPD methylation.