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Plasma upgrading of guaiacol as lignin pyrolytic-oil model compound through a combination of hydrogen production and hydrodeoxygenation reaction
Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2018-04-20
Hamed Taghvaei, Mohammad Reza Rahimpour

In this study, hydrodeoxygenation reaction is conducted without using hydrogen as a feed. The required hydrogen was provided in situ through plasma decomposition of methoxyl and methyl radicals which exist in the chemical structure of lignin pyrolytic-oil at room temperature. Operating parameters including applied voltage, Ar flow rate and discharge length were carefully studied in order to maximize the conversion and degree of deoxygenation. A guaiacol conversion of 81% and deoxygenation degree of 52% were achieved at an applied voltage of 12 kV and a discharge length of 20 cm without using any catalyst and hydrogen. By optimizing discharge length and Ar flow rate, conversion increase by 36% and power consumption reduced by 33%. Unlike previous studies in which catechol was produced as a major product, in this study phenol is produced selectively through direct demethoxylation rather than demethylation reaction. Due to operation at low temperature and atmospheric pressure no hydrogenation of aromatic ring was observed. Results show that the non-thermal plasma is capable for the upgrading of guaiacol and may pave the way towards the hydrogen-free hydrodeoxygenation reaction.



中文翻译:

通过氢生产和加氢脱氧反应的结合来对作为木素热解油模型化合物的愈创木酚进行等离子体提质

在这项研究中,加氢脱氧反应是在不使用氢气作为原料的情况下进行的。通过在室温下木质素热解油的化学结构中存在的甲氧基和甲基的等离子体分解原位提供所需的氢。为了最大程度地提高转化率和脱氧度,对包括施加电压,Ar流量和放电长度在内的运行参数进行了仔细研究。在不使用任何催化剂和氢气的情况下,在施加12 kV的电压和20 cm的放电长度时,可获得81%的愈创木酚转化率和52%的脱氧度。通过优化放电长度和Ar流量,转化率提高了36%,功耗降低了33%。与以前的研究以邻苯二酚为主要产品的研究不同,在这项研究中,苯酚是通过直接脱甲氧基化而不是脱甲基化反应选择性生产的。由于在低温和大气压下操作,未观察到芳环的氢化。结果表明,非热等离子体能够促进愈创木酚的提质,并可能为无氢加氢脱氧反应铺平道路。

更新日期:2018-04-25
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