Catalytic hydrothermal liquefaction of microalgae using nanocatalyst
Catalytic hydrothermal liquefaction of microalgae using nanocatalyst
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DOI：
10.1016/j.apenergy.2016.09.017
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发表时间：
2016-12-01
期刊：
影响因子：
11.2
通讯作者：
Yoshikawa, Kunio
中科院分区：
文献类型：
--
作者：
Saber, Mohammad;Golzary, Abooali;Yoshikawa, Kunio
由于化石燃料的可耗竭性及其对环境的不利影响，生物油已被认为是燃料应用的替代能源。目前，生物油的生产主要有两种工艺：热解和水热液化。水热液化被定义为在有或没有催化剂的情况下在热压缩水中进行的生物质到液体的转化路线。HTL的主要问题是过程的高压，这导致设备的高资本成本。因此，应该降低工艺压力和温度，但在较低的温度下，生物油的产量不足以使HTL成为可持续燃料生产的经济工艺。在本研究中，我们考察了纳米催化剂（纳米ni /SiO2）、酸性催化剂（合成沸石）和碱性催化剂（Na2CO3）在低温（210℃、230℃、250℃）下提高生物油收率的适用性。本研究的主要结果是纳米微藻水热液化中纳米ni /SiO2 >沸石> Na2CO3的产油率较高。在250℃的温度下，纳米ni /SiO2的生物油收率最高（30.0 wt%）。此外，使用催化剂导致生物油的氧和氮含量降低，从而使其热值升高。本研究结果也提示了纳米催化剂回收2-3倍的可能性。(C) 2016 Elsevier Ltd.版权所有。
Due to exhaustibility of fossil fuels and their adverse effects on the environment, bio-oil has been considered as an alternative energy source for fuel applications. Currently, there are two main processes for bio-oil production: pyrolysis and hydrothermal liquefaction (HTL). The hydrothermal liquefaction is defined as biomass-to-liquid conversion route carried out in the hot compressed water with or without the presence of a catalyst. The major concern in HTL is the high pressure of the process which results in high capital cost of equipment. Thus, the process pressure and temperature should be reduced, but at a lower temperature, bio-oil yield is not high enough to make HTL an economical process for sustainable fuel production. In this research, we investigated the applicability of a nanocatalyst (nano-Ni/SiO2), an acid catalyst (synthesized zeolite), and an alkali catalyst (Na2CO3) to increase the bio-oil yield at low temperatures (210 degrees C, 230 degrees C, 250 degrees C). The major result of this work was higher bio-oil yields with the order of nano-Ni/SiO2 > zeolite > Na2CO3 in hydrothermal liquefaction of microalgae Nannochloropsis sp.. The highest bio-oil yield (30.0 wt%) was obtained at 250 degrees C by using Nano-Ni/SiO2. Moreover, applying catalyst resulted in a decrease in the oxygen and the nitrogen contents of the bio-oil and consequently an increase in its heating value. The results of this research also suggest the possibility of nanocatalyst recovery for 2-3 times. (C) 2016 Elsevier Ltd. All rights reserved.