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Dynamics of carbon formation during the catalytic hydrodeoxygenation of raw bio-oil

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Abstract

The formation, growth and transformation of the carbon residue (coke) deposited on the catalyst during the raw bio-oil hydrodeoxygenation have been studied. These deposits have a great impact on the overall process performance, and they have been formed in accelerated deactivation conditions (450 °C, 65 bar, space time of 0.09 gcat h gbio-oil−1) using a continuous fixed bed reactor and a FeMoP/HZSM-5 catalyst. Coke deposition causes partial deactivation of the catalyst, which reaches a pseudosteady state of constant activity and also contant yields of interesting chemicals. The evolution of the coke in the transient state has been studied through temperature-programmed oxidation, Raman spectroscopy and elemental analysis. We have identified three different types of coke, whose composition evolves with time on stream towards condensed and stable structures. The assessment of the evolution of the reaction medium composition and the application of the principal component analysis (PCA) methodology have evidenced that the dynamics of coke have three stages: (1) it is controlled by the thermally-induced deposition of thermal lignin; (2) followed by the interconversion into intermediate coke through aging reactions; and (3) it ends up in a pseudosteady state dominated by the formation of catalytic coke species originating from both deoxygenated and carbonized intermediate coke as well as the condensation of aromatics in the reaction medium.

Graphical abstract: Dynamics of carbon formation during the catalytic hydrodeoxygenation of raw bio-oil

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Supplementary files

Article information


Submitted
27 Mar 2020
Accepted
18 May 2020
First published
27 May 2020

This article is Open Access

Sustainable Energy Fuels, 2020, Advance Article
Article type
Paper

Dynamics of carbon formation during the catalytic hydrodeoxygenation of raw bio-oil

I. Hita, T. Cordero-Lanzac, G. Bonura, F. Frusteri, J. Bilbao and P. Castaño, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/D0SE00501K

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