Optimization of reaction parameters for bio-oil production by catalytic pyrolysis of microalga Tetraselmis suecica: Influence of Ni-loading on the bio-oil composition
Optimization of reaction parameters for bio-oil production by catalytic pyrolysis of microalga Tetraselmis suecica: Influence of Ni-loading on the bio-oil composition
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DOI：
10.1016/j.renene.2019.04.130
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发表时间：
2019-11
期刊：
影响因子：
8.7
通讯作者：
Srikanth Chakravartula Srivatsa;Fanghua Li;S. Bhattacharya
中科院分区：
文献类型：
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作者：
Srikanth Chakravartula Srivatsa;Fanghua Li;S. Bhattacharya
在固定床反应器中，以一种海洋微藻Tetraselmis suecica为原料，在一系列分子筛（Si/Al = 30）负载的Ni催化剂存在下，通过脱挥发分和催化处理两步反应来提高热解油的烃组成。当Ni负载量为3wt%时，烃含量最高，为55.38%，其中脂肪烃和芳烃含量分别为35.21%和20.17%。此外，含氧化合物从42.88%下降到9.55%，含氮化合物从40.68%下降到35.07%。发现Ni负载的催化剂的活性增加至3wt% Ni负载，并且在与催化剂酸度测量类似的线中在更高的负载下降低。此外，在较高的Ni负载量下，随着Ni晶粒尺寸的增大，催化活性降低。结果表明，负载镍催化剂对裂解油有一定的脱氮效果，但需解决含氮化合物的脱除问题。热解温度和镍负载量对生物油脱氮除氧效果有重要影响。生物油的质量可受到强酸位点、镍负载量和孔径的影响。
In this work, a marine microalgaTetraselmis suecicawas pyrolyzed in a fixed-bed reactor in the presence of a series of zeolite (Si/Al = 30) supported Ni catalysts to increase the hydrocarbon composition of the pyrolysis oil by a two-step process - devolatilization followed by catalytic treatment. A 3 wt% Ni-loading on zeolite showed the highest hydrocarbon content of 55.38%, in which aliphatic hydrocarbons and aromatic hydrocarbons were 35.21% and 20.17%, respectively. Besides, the oxygen-containing compounds decreased from 42.88% to 9.55% while the nitrogen-containing compounds decreased from 40.68% to 35.07%. The activity of the Ni-loaded catalysts was found to increase up to 3 wt % Ni-loading and decrease at higher loadings in similar lines to catalyst acidity measurements. Besides, the catalytic activity decreased with an increase in crystallite size of Ni at higher Ni loadings. The results indicate that the Ni-loaded catalysts can deoxygenate pyrolysis oils, but it is necessary to address the removal of the nitrogenous compounds. Pyrolysis temperature and Ni-loading play an important role in the removal of oxygen and nitrogen from the bio-oil. The quality of the bio-oil can be affected by the presence of strong acid sites, nickel-loading and the pore size.