Modeling the Kinetics of Deactivation of Catalysts during the Upgrading of Bio-oil

The fouling of catalysts for the upgrading of bio-oils appears to be very different from the fouling of catalysts for the hydroprocessing of petroleum-derived streams. There are two reasons for the differences: (a) bio-oil contains polarizable components and phases that can stabilize reaction interm...

Full description

Saved in:
Bibliographic Details
Published in:Energy & fuels 2015-01, Vol.29 (1), p.273-277
Main Authors: Weber, Robert S., Olarte, Mariefel V., Wang, Huamin
Format: Article
Language:English
Subjects:
Carbonyls
Catalysis
Catalysts
Computer simulation
Deposition
Fouling
Reaction kinetics
Upgrading
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The fouling of catalysts for the upgrading of bio-oils appears to be very different from the fouling of catalysts for the hydroprocessing of petroleum-derived streams. There are two reasons for the differences: (a) bio-oil contains polarizable components and phases that can stabilize reaction intermediates exhibiting charge separation and (b) bio-oil components contain functional groups that contain O, notably carbonyls (>CO). Aldol condensation of carbonyls affords very different pathways for the production of oligomeric, refractory deposits than does dehydrogenation/polymerization of petroleum-derived hydrocarbons. Colloquially, we refer to the bio-oil-derived deposits as “gunk” to discriminate them from coke, the carbonaceous deposits encountered in petroleum refining. Classical gelation appears to be a suitable model for the “gunking” reaction. Our work has helped explain the temperature range at which bio-oil should be preprocessed (“stabilized”) to confer longer lifetimes on the catalysts used for more severe processing. Stochastic modeling (kinetic Monte Carlo simulations) appears promising to capture the rates of oligomerization of bio-oil.
ISSN:0887-0624
1520-5029
DOI:10.1021/ef502483t