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首页> 外文期刊>Catalysis for Sustainable Energy >Niobia supported on silica as a catalyst for Biodiesel production from waste oil
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Niobia supported on silica as a catalyst for Biodiesel production from waste oil

机译：纳米比亚支撑二氧化硅作为废油生产生物柴油的催化剂

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The activity and stability of niobia supportedon silica catalyst have been tested in continuousmicro-pilot reactors, for biodiesel production startingfrom acid vegetable oils. A catalyst was preparedby the impregnation of silica pellets with a loadingof 12% of Nb and was extensively characterized.The activity of this catalyst in both esterification andtransesterification was tested in a continuous micro-pilotlaboratory plant in which acid oil was fed (FFA 10% w/w)at a temperature of 220°C and at a pressure of 60 bar.The niobia based catalyst resulted in a very activecatalyst in both esterification (FFA conversion =95-90%) and transesterification reactions (FAMEyield = 80-90%), and the activity remainedquite constant for more than 100 h on stream.Notwithstanding this stability, a non-negligible leachingphenomena has been detected, in the case of long-timecontinuous runs, as the Nb concentration on the spentcatalyst resulted lower than that on the fresh one. Theobtained result confirms that the leaching of the activespecie is one of the most strong problem in heterogeneouscatalysis for biodiesel production.
机译：氧化铌负载在二氧化硅催化剂上的活性和稳定性已经在连续的中试反应器中进行了测试，用于从酸性植物油开始生产生物柴油。负载量为12％的Nb的二氧化硅粒料的浸渍制备了一种催化剂，并进行了广泛表征。在连续的中试实验室中测试了该催化剂在酯化和酯交换反应中的活性，在该实验室中加入了酸性油（FFA 10％w / w）在220°C的温度和60 bar的压力下。基于氧化铌的催化剂在酯化反应（FFA转化率95-90％）和酯交换反应（FAME产率= 80-90％）中都产生了非常活跃的催化剂尽管这种稳定性很稳定，但在长时间连续运行的情况下，仍检测到了不可忽略的浸出现象，因为废催化剂上的Nb浓度低于新鲜催化剂上的Nb浓度一。所得结果证实，活性物质的浸出是生物柴油生产中非均相催化中最严重的问题之一。

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