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Liquid phase oxidation of p-vanillyl alcohol over synthetic Co-saponite catalyst
Abstract Effect of cobalt loading on porosity of synthetic Co-saponite catalysts and on the air oxidation of p-vanillyl alcohol was studied by varying Co content in the range of 5% to 30% using in situ precipitation method. The pore size increased from 1.29 to 3.69nm indicating a transition from micro to meso porosity, with increase in Co loading from 5% to 30%. The distribution ratio of Co3O4/CoO phases as estimated from TPR studies, also increased from 0.84 to 1.67 with increase in Co loading from 5% to 13% and remained almost constant (1.7) with further increase in Co loading up to 30%. The highest activity (conversion 55%) and selectivity of 99% to p-vanillin obtained for 13% Co-saponite in p-vanillyl alcohol oxidation was due to the highest distribution ratios of Co3O4/CoO phases.
Graphical Abstract Display Omitted Research Highlights ► Co-saponite transformed from micro to mesoporous by increasing the Co loading ► Highest air oxidation activity and selectivity was achieved for 13% Co-saponite ► Co3O4/CoO ratio and pore size of Co-saponite altered activity, selectivity pattern
Liquid phase oxidation of p-vanillyl alcohol over synthetic Co-saponite catalyst
Abstract Effect of cobalt loading on porosity of synthetic Co-saponite catalysts and on the air oxidation of p-vanillyl alcohol was studied by varying Co content in the range of 5% to 30% using in situ precipitation method. The pore size increased from 1.29 to 3.69nm indicating a transition from micro to meso porosity, with increase in Co loading from 5% to 30%. The distribution ratio of Co3O4/CoO phases as estimated from TPR studies, also increased from 0.84 to 1.67 with increase in Co loading from 5% to 13% and remained almost constant (1.7) with further increase in Co loading up to 30%. The highest activity (conversion 55%) and selectivity of 99% to p-vanillin obtained for 13% Co-saponite in p-vanillyl alcohol oxidation was due to the highest distribution ratios of Co3O4/CoO phases.
Graphical Abstract Display Omitted Research Highlights ► Co-saponite transformed from micro to mesoporous by increasing the Co loading ► Highest air oxidation activity and selectivity was achieved for 13% Co-saponite ► Co3O4/CoO ratio and pore size of Co-saponite altered activity, selectivity pattern
Liquid phase oxidation of p-vanillyl alcohol over synthetic Co-saponite catalyst
Garade, A.C. (author) / Biradar, N.S. (author) / Joshi, S.M. (author) / Kshirsagar, V.S. (author) / Jha, R.K. (author) / Rode, C.V. (author)
Applied Clay Science ; 53 ; 157-163
2010-10-28
7 pages
Article (Journal)
Electronic Resource
English
Liquid phase oxidation of p-vanillyl alcohol over synthetic Co-saponite catalyst
| Online Contents | 2011