In comparison with the development of new materials with strong basicity, less attention is paid to the improvement of water
resistance of solid bases. In the present study, Ca(NO3)2 and γ-Al2O3 was employed as base precursor and support, respectively, producing
the materials denoted as CaNA. The results show that calcium ions can insert into the vacancies on the surface of γ-Al2O3, thus generating
a strong guest-host interaction. The decomposition temperature of Ca(NO3)2 on γ-Al2O3 (e.g. 460 °C for 20CaNA) is therefore obviously
lower than unsupported Ca(NO3)2 (600 °C). The materials after activation possess both superbasicity with high strength of 27.0
and excellent water resistance. This can be attributed to the strong guest-host interaction and low solubility of guest. Moreover, the CaNA
materials are catalytically active in 2-propanol dehydrogenation as well as 1-hexene isomerization. On the basis of the present study, it is
possible to fabricate a variety of water resistant functional materials by judicious choice of guest and host, which provides valuable candidates
for catalysis and adsorption involving water.
Keywords: Alumina, Calcium nitrate, Guest-host interaction, Solid base, Water resistance.
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