Abstract
Immobilization of molybdenum complexes of amino acid Schiff bases within the SBA-16 nanocages produced new heterogeneous catalysts for the epoxidation of olefins. First, amino acid Schiff bases were obtained through the reaction of amino acids with salicylaldehyde. Then, complexation of the prepared amino acid Schiff bases with molybdenum (VI) produced the molybdenum complexes of amino acid Schiff bases. Immobilization of the molybdenum complexes into the SBA-16 nanocages followed by silylation with triethoxyoctylsilane gave the heterogenized molybdenum catalysts. The obtained catalysts were characterized with several physicochemical techniques. FT-IR and inductively coupled plasma optical emission (ICP-OES) spectroscopies approved the inclusion of molybdenum complexes within the SBA-16 nanocages. The results of X-ray diffraction (XRD) and nitrogen adsorption-desorption (BET method) analyses illustrated that surface properties of SBA-16 were maintained upon the inclusion of molybdenum complexes. The prepared catalysts exhibited good activities and excellent selectivities (>99%) in the epoxidation of olefins with tert-butyl hydroperoxide (TBHP).
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