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Hydrodeoxygenation of Propylphenols on a Niobia‐Supported Platinum Catalyst: Ortho, Meta, Para Isomerism, Reaction Conditions, and Phase Equilibria
Advanced Sustainable Systems ( IF 7.1 ) Pub Date : 2020-04-27 , DOI: 10.1002/adsu.201900140
José Luis González Escobedo 1 , Eveliina Mäkelä 1 , Jouni Neuvonen 1 , Petri Uusi‐Kyyny 1 , Marina Lindblad 2 , Reetta Karinen 1 , Riikka L. Puurunen 1
Affiliation  

The alkylphenols found in liquefied lignocellulose could become a source of bio‐based aromatic hydrocarbons for fuel components. In the hydrodeoxygenation (HDO) of alkylphenols, hydroxyl groups must be removed while avoiding the hydrogenation of the aromatic ring. Here, the HDO of propylphenols is studied using a Pt/Nb2O5 catalyst and n‐tetradecane solvent. HDO experiments are performed using different reaction conditions of batch residence time (0–161 min gcat greactant−1), pressure (20–30 bar H2), and temperature (300–375 °C). HDO is studied with ortho‐, meta‐, and para‐propylphenol. The influence of vapor–liquid equilibrium and chemical equilibrium are assessed using thermodynamic calculations. Almost full deoxygenation is attained in the experiments; the main products are propylbenzene and propylcyclohexane. The study finds that, of the isomers, 4‐propylphenol is the most favorable for forming propylbenzene (77% maximum selectivity), whereas 2‐propylphenol is the least favorable (55% maximum selectivity). Additionally, the reactivity of propylbenzene in the test conditions is detrimental to its selectivity after 5 min gcat greactant−1. Finally, the temperature at which the process favors propylbenzene is found to shift as a function of pressure; at 20 bar, propylbenzene is favored at 350 °C and at 30 bar, it is favored at 375 °C.

中文翻译:

纳米比亚负载的铂催化剂上丙酚的加氢脱氧:邻位,间位,对位异构,反应条件和相平衡

液化木质纤维素中发现的烷基酚可能会成为燃料成分的生物基芳香烃来源。在烷基酚的加氢脱氧(HDO)中,必须除去羟基,同时避免芳环的氢化。在这里,使用Pt / Nb 2 O 5催化剂和十四烷溶剂研究了丙基苯酚的HDO 。HDO实验是在不同的反应条件下进行的,分别是批停留时间(0–161 min g cat g反应物-1),压力(20–30 bar H 2)和温度(300–375°C)。HDO进行了研究与间位对位丙基苯酚 使用热力学计算评估气液平衡和化学平衡的影响。实验中几乎达到了完全脱氧。主要产品为丙基苯和丙基环己烷。研究发现,在异构体中,4-丙基苯酚最适合形成丙苯(最大选择性为77%),而2-丙基苯酚最不利于形成苯(最大选择性为55%)。另外,在5min g cat g反应物-1后,在测试条件下丙苯的反应性对其选择性有害。最后,发现该方法有利于丙苯的温度随压力而变化;在20 bar时,丙苯在350°C时比较合适,在30 bar时,在375°C时比较合适。
更新日期:2020-04-27
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