• selectivity engineering in the synthesis of value added chemicals: oxidation of 1-octanol to 1-octanal over nano-fibrous ag–oms-2 catalysts

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 793
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     oxidation of 1-octanol to 1-octanal is commercially very attractive, since the product is used extensively in the fragrance industry. among the various methods, selective air oxidation with a suitable heterogeneous catalyst will be green and clean. in this work, novel cryptomelane type octahedral molecular sieve type 2 (ag–oms-2) catalysts, with ag loading from 5 to 15%, w/w, were synthesized and evaluated in air oxidation of 1-octanol in a fixed bed vapour phase reactor. all catalysts were fully characterized to understand the activity and selectivity. the conversion increased with ag loading but the selectivity was the highest for 10% ag–oms-2. a systematic study was conducted to ascertain the effects of various parameters. use of toluene as a diluant leads to better conversion and selectivity. the optimized conditions are: catalyst mass/molar flow rate of 1-octanol (w/fa0)- 20 g h/mol, 523 k, toluene to 1-octanol molar ratio- 4:1, weight hourly space velocity (whsv)- 16.74 h−1, air flow rate- 6 l/h, air pressure- 101.3 kpa. it follows the mars-van krevelen mechanism and is intrinsically kinetically controlled. the activation energy is 14.39 kcal/mol using 10%, w/w ag–oms-2. it provides a better green process than those reported so far.

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