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New approach on the catalytic oxidation of methanol to formaldehyde over MoO_3 supported on nano hydroxyapatite catalysts

机译:纳米羟基磷灰石催化剂支持MOO_3甲醇催化氧化对甲醇催化氧化的新方法

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Molybdenum oxide (20 wt. %) supported on nano hydroxyapatite mixed was prepared by impregnation method and calcinated at 400°, 500°, 600° and 700°C in static air atmosphere. The catalysts were characterized by thermogravimetry (TG), differential thermal analysis (DTA), X-ray diffraction (XRD), Transmission Electron Microscope (TEM) and nitrogen sorption measurements. The gas-phase oxidation of methanol to formaldehyde was carried out in a conventional fixed flow bed reactor. The obtained results clearly revealed that the formation of CaMoO_4 spinel nano particles was active and selective catalyst towards the formation of formaldehyde. The maximum yield of formaldehyde was 97% on the catalyst calcined at 400°C. Moreover, the yield of formaldehyde was found unaffected by increasing the calcination temperature up to 700°C.
机译:通过浸渍方法制备纳米羟基磷灰石混合的氧化钼(20重量%)并在400°,500°,600°和700℃下煅烧静态空气气氛。该催化剂的特征在于热重率(Tg),差分热分析(DTA),X射线衍射(XRD),透射电子显微镜(TEM)和氮吸附测量。在常规的固定流床反应器中进行甲醇对甲醛的气相氧化。所得结果清楚地显示出Camoo_4尖晶石纳米颗粒的形成是活性的,选择性催化剂朝向形成甲醛。在400℃下煅烧的催化剂上甲醛的最大收率为97%。此外,发现甲醛的产率未使煅烧温度增加到700℃。

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