Vapour phase partial oxidation of pyrolysis oil model compounds in presence of vanadia-titania catalyst
department or school: Applied Science, Faculty of
department or school: Chemical and Biological Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Ramachandran, Anuradha
issued: 2021-06-23T21:13:36Z
issued: 2021
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Pyrolysis oil obtained from biomass has complex chemistry with more than 300 compounds. The utilization of pyrolysis oil as a transportation fuel is challenged by the high water and oxygen content in the pyrolysis oil. In this study, an alternate approach to improve the economic viability of pyrolysis oil is explored by employing oxidative catalysis to convert bio-oil ketones and alcohols to carboxylic acids. Due to bio-oil’s complex chemistry, this study examined two representative compounds from alcohol and ketone functional groups: ethanol (ETH) and hydroxyacetone (HAC). The model compounds were subjected to partial oxidation in presence of vanadium pentaoxide on titanium dioxide (V/TiO₂) support. The effect of temperature, oxygen ratio in the feed, and weight hourly space velocity (WHSV) on conversion, selectivity, and yield from the oxidation reaction were investigated in a packed bed reactor. Partial oxidation of HAC in presence of V/TiO₂ produced lactic acid, acetic acid, and formic acid. 92.8% conversion was achieved at 473K, O₂/HAC molar ratio = 1.5 at WHSV of 1100 cm³·min⁻¹·gcat⁻¹. Temperature, O₂/HAC and WHSV was found to impact the conversion of HAC and yield of LA. The overall reaction followed second-order kinetics and the activation energy was estimated to be 31.35 kJ·mol⁻¹. Acetic acid (AA), acetaldehyde, CO₂, and CO were identified as the major products from partial oxidation of ethanol in V/TiO₂ catalyst. Complete conversion of ETH was achieved at higher temperatures (>523K) and low WHSV conditions (<250 cm³·min⁻¹·gcat⁻¹). Only temperature and WHSV were identified as variables with significant influence on the conversion of ETH and yield of AA. A first-order rate law was used to describe overall kinetics and the activation energy was estimated to be 76.03kJ·mol⁻¹. The influence of acetic acid in the feed mixture was also investigated. The conversion of HAC and ETH in presence of acetic acid decreased slightly. However, the selectivity and yield of …
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/78764
note: VAPOUR PHASE PARTIAL OXIDATION OF PYROLYSIS OIL MODEL COMPOUNDS IN PRESENCE OF VANADIA-TITANIA CATALYST by Anuradha Ramachandran B.Tech, Anna University, 2018 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Chemical and Biological Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) June 2021 ©Anuradha Ramachandran, 2021 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, a thesis entitled: Vapour Phase Partial Oxidation of Pyrolysis Oil Model Compounds in Presence of Vanadia-Titania Catalyst submitted by Anuradha Ramachandran in partial fulfillment of the requirements for the degree of Master of Applied Science in Chemical and Biological Engineering Examining Committee: Dr. Heather Trajano, Chemical and Biological Engineering, UBC Supervisor Supervisory Committee Member Dr. Chang Soo Kim, Chemical and Biological Engineering, UBC Supervisory Committee Member iii Abstract Pyrolysis oil obtained from biomass has complex chemistry with more than 300 compounds. The utilization of pyrolysis oil as a transportation fuel is challenged by the high water and oxygen content in the pyrolysis oil. In this study, an alternate approach to improve the economic viability of pyrolysis oil is explored by employing oxidative catalysis to convert bio-oil ketones and alcohols to carboxylic acids. Due to bio-oil’s complex chemistry, this study examined two representative compounds from alcohol and ketone functional groups: ethanol (ETH) and hydroxyacetone (HAC). The model compounds were subjected to partial oxidation in presence of vanadium pentaoxide on titanium dioxide (V/TiO2) support. The effect of temperature, oxygen ratio in the feed, and weight hourly space velocity (WHSV) on conversion, selectivity, and yield from the oxidation reaction were investigated in a packed bed reactor…
has type: Thesis/Dissertation
date issued: 2021-11
is shown at: 10.14288/1.0398505
language: eng
degree discipline: Chemical and Biological Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Trajano, Heather L.
type: Text
identifier URI: http://hdl.handle.net/2429/78764