Effects of titania based catalysts on in-situ pyrolysis of Pavlova microalgae
Effects of titania based catalysts on in-situ pyrolysis of Pavlova microalgae
复制标题
DOI：
10.1016/j.fuproc.2017.05.001
复制
发表时间：
2017-11
影响因子：
7.5
通讯作者：
T. Aysu;Oluwafunmilola Ola;M. Maroto-Valer;A. Sanna
中科院分区：
文献类型：
--
作者：
T. Aysu;Oluwafunmilola Ola;M. Maroto-Valer;A. Sanna
在固定床反应器中，以二氧化钛为催化剂，在不同温度下对微藻进行热解。考察了催化剂对微藻热解的影响。当使用催化剂时，很大一部分起始能量(∼和63-74%DAF)在生物油中被回收。在500℃下，添加Ni/TiO2时，生物油的产率提高了20%(22.55%)，所得生物油的热值在35~37 MJ/kg之间，具有很强的脱氧能力，氧含量(%∼)从51%下降到∼的9%~12%。核磁共振氢谱和气相色谱-质谱分析表明，二氧化钛催化剂增加了生物油中的脂肪族和芳香族化合物，减少了含氧物。Ni/TiO2在增加脂肪族质子(60%)和减少结焦方面的活性最大。其裂化活性的提高是由于其在催化剂表面的可用性高于Co和Ce，以及Ni和TiO2载体之间的强相互作用。尽管生物油已部分脱氮，但在不进一步升级的情况下，氮含量仍然是其用作生物燃料的主要限制因素。
Pavlovamicroalga was pyrolysed in presence of titania based catalysts in a fixed bed reactor at various temperatures. The effects of catalysts onPavlovamicroalga pyrolysis were investigated. A large fraction of the starting energy (∼ 63–74% daf) was recovered in the bio-oils when the catalysts were used. The bio-oil yield was 20% higher in presence of Ni/TiO2(22.55 wt%) at 500 °C. The High Heating Values of the produced bio-oils were in the range of ∼ 35–37 MJ/kg and suffered strong deoxygenation, with O content (% daf) diminished from 51 wt% to ∼ 9–12 wt%. The1H Nuclear Magnetic Resounance and Gas Chromatography Mass Spectrometry suggested that the titania catalysts enlarged the aliphatics and aromatic compounds and decreased oxygenates in the bio-oils. Ni/TiO2had the greatest activity in increasing aliphatic protons (60%) and decreasing coke formation. Its enhanced cracking activity was due to its higher availability on the catalyst surface, compared to Co and Ce, and to strong interaction between Ni and TiO2support. Despite the fact that the bio-oils were partially de-nitrogenated, the N-content still represent a major limitation for their use as bio-fuels without further upgrading.