Kinetika katalitske hidrodeoksigenacije modelnih gradnikov lignina

Černe, Ana (author), Plazl, Igor (mentor), Likozar, Blaž (co-mentor)

Magistrska naloga vključuje raziskavo kinetike katalitske hidrodeoksigenacije (HDO) modelnih gradnikov lignina. V ta namen sem izvedla eksperiment v šaržnem reaktorju, v katerem sem katalitski HDO izvedla z izbranimi modelnimi gradniki lignina. HDO je proces pod visokim pritiskom in zmerno temperaturo, pri katerem se iz spojin odstrani kisik s katalitsko reakcijo z vodikom. HDO sem izvedla s HB, 1,2-HHB, MB, 1,2-MMB in HMB. Kot je razvidno iz pridobljenih rezultatov, na potek HDO vpliva vrsta in število funkcionalnih skupin. Ob prisotnosti ene funkcionalne skupine je HDO hitrejši kot pri dveh. V primeru prisotnosti dveh funkcionalnih skupin pride do hitrejše HDO pri HMB, ki ima dve različni funkcionalni skupini na benzenovem obroču. Na potek HDO vpliva tudi izbira katalizatorja. Za eksperimentalno izvedbo HDO sem uporabila tri različne katalizatorje, in sicer Ru/C, Ru/Al2O3 in Rh/C. Ru/C in Ru/Al2O3 sta pokazala odličen prispevek k aktivnosti hidrogeniranja aromatskega obroča ter odstranjevanju metoksilne in hidroksilne skupine iz oksigeniranih aromatov, medtem ko je bil pri uporabi Rh/C večji poudarek na hidrogenaciji. Način poteka HDO pa je odvisen tudi od temperature, kar je pokazala izvedba eksperimentov pri dveh različnih temperaturah (275 °C in 325 °C). Višja kot je temperatura, hitrejša je hidrodeoksigenacija.

• Language: Slovenian
• Keywords: hidrodeoksigenacija, lignin, katalizator
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2022
• PID: 20.500.12556/RUL-137857
• COBISS.SI-ID: 116232707
• Publication date in RUL: 04.07.2022

Secondary language

• Language: English
• Title: Kinetics of catalytic hydrodeoxigenation of lignin model builders

Abstract

This master thesis analyzes the kinetics of catalytic hydrodeoxygenation (HDO) of model lignin components. For this purpose, an experiment was carried out in a batch reactor, where catalytic HDO was performed with selected model lignin components. HDO is a high-pressure and moderate-temperature process, in which oxygen is removed from compounds by catalytic reaction with hydrogen. The process was carried out with HB, 1,2-HHB, MB, 1,2-MMB and HMB. The results show the course of HDO is influenced by the type and number of functional groups. It is faster with one functional group than with two. With two functional groups, HDO is faster for HMB that has two different functional groups on the benzene ring. HDO is also affected by the choice of catalysts. The experimental HDO included three different catalysts: Ru/C, Ru/Al2O3 and Rh/C. Ru/C and Ru/Al2O3 contributed well to the hydrogenation activity of the aromatic ring and the removal of the methoxy and hydroxyl groups from the oxygenated aromatic compounds. In turn, the use of Rh/C was more focused on hydrogenation. The mode of HDO is also temperature dependent, as shown by experiments carried out at two different temperatures (275 °C and 325 °C). The higher the temperature, the faster the hydrodeoxygenation.

• Keywords: hydrodeoxygenation, lignin, catalyst