Co-TUD-1: A Ketone-Selective Catalyst for Cyclohexane Oxidation

摘要

Cobalt-containing mesopo-rous TUD-1 with different Si/Co ratios (100,50,20,and 10) was synthesized by the direct hydrothermal treatment method (DHT) using triethanolamine (TEA) as a template.The prepared samples (denoted as Co-TUD-1) were characterized by XRD,UV/Vis spec-troscopy,elemental analysis,N_2 sorp-tion measurements,~(29)Si magic-angle spinning (MAS)-NMR,Raman spec-troscopy,and HRTEM.The catalytic performance of Co-TUD-1 samples was tested in the liquid-phase oxidation of cyclohexane with tert-butylhydroper-oxide (TBHP) as oxidant under sol-ventless conditions.Higher catalytic efficiency was observed in samples with low Co-loading and thus,most likely isolated Co~(II) active sites,than in samples with high Co-loading and nanopar-ticles or bulk Co_3O_4 embedded in the TUD-1 silica.