| 摘要 |
A catalyst, preferably for the partial oxidation of methane to formaldehyde and methanol at 550-800 deg C with oxygen or air, comprises a silica support having an iron content of 0.01-10 Fe atoms/nm<2> with greater than 10 wt.% as isolated Fe<2+>/Fe<3+>. A catalyst (I), preferably for the partial oxidation of methane to formaldehyde and methanol at 550-800 deg C with oxygen or air, comprises a silica support having a BET surface area of 50-800 m<2>/g, a pore volume of 0.01-2 cm<2>/g, a silanol group content of 0.1-2 /nm<2>, an alkali-, alkaline earth or titanium impurity content of less than 0.1 wt.% expressed as oxide and an aluminum oxide content of 0-1 wt.% and a iron content, expressed as Fe2O3 of 0.01-5 wt.% wherein the iron content is 0.01-10 Fe atoms/nm<2> with greater than 10 wt.% as isolated Fe<2+>/Fe<3+>. An Independent claim is included for preparation of the catalyst (I) by contacting a silicon support with an iron salt by incipient wetness of a solution of a FeII/FeIII salt, preferably a FeII salt, adsorption/impregnation with a solution of a FeII salt or CVD and coprecipitation of Fe and the silicon support. |
