Direct synthesis, characterization of Cu-SBA-15 and its high catalytic activity in hydroxylation of phenol by H2O2 |
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Authors: | Lingping Wang Aiguo Kong Bo Chen Hanming Ding Yongkui Shan Mingyuan He |
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Affiliation: | Shanghai Key Green Chemistry and Chemical Process, Department of Chemistry East China Normal University, Shanghai 200062, PR China |
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Abstract: | Transition metal copper substituted mesoporous silica (Cu-SBA-15) was synthesized using triblock copolymers surfactant as template agent under acidic condition. The result Cu-SBA-15 was characterized with XRD, ICP-AES, FT-IR and N2 adsorption–desorption measurements, which prove that Cu(II) was mainly incorporated into the framework of Cu-SBA-15. Its catalytic activity was studied for phenol hydroxylation using H2O2 (30%). The substituting element (Cu2+) is incorporated into the framework position forming a new type of active site which raises the phenol conversion to 62.4% and the diphenol (the mixture of catechol (CAT) and hydroquinone (HQ)) selectivity to 97%. The Cu-SBA-15 has very high selectivity for catechol (about 71% selectivity), which is completely different from that of the microporous titanium silicalite zeolites (47.1% phenol conversion and about 50% selectivity to CAT under same reaction conditions). The results obtained indicate that the selective oxidation of phenol with H2O2 by a radical substitution mechanism. |
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Keywords: | Cu-SBA-15 Cu-substituted mesoporous silicas Phenol hydroxylation Catalytic oxidation Oxidant catalyst |
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