Conversion of glycerol to light olefins and gasoline precursors

Samuel D. Blass, Richard J. Hermann, Nils E. Persson, Aditya Bhan, Lanny D. Schmidt

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We explore a glycerol-to-olefins process in a reactor containing dehydration, hydrogenation, and upgrading stages in series. Glycerol, co-fed with H2 over HZSM-5 (1.0 g, Si/Al = 11.5, 400 C), was first dehydrated to yield a mixture of acetaldehyde, acrolein, and hydroxypropanone. Acrolein was hydrogenated to propanal over a Pd/α-Al2O 3 catalyst and the effluent was passed to a third stage which served to further upgrade propanal to olefins. Rapid third stage deactivation was observed, although, we obtained a maximum 70% yield of light olefins from a propanal stream reacted over HBEA (0.5 g, 500 C) with minimal CO production. A decrease in propanal conversion and C2-3 olefin yield was observed along with a corresponding increase in C4-5 olefin yield as time-on-stream increased to 150 min. We conclude that propanal condensed over Brønsted acid sites to form C4-5 olefins, which subsequently cracked at high conversion to form C2-3 olefins. Increasing the temperature from 400 to 500 C also decreased the C4-5 olefin yield from 13 to 9% while increasing C2-3 olefin yield from 4 to 15%. CC bond formation occurred during glycerol upgrading in a staged reactor configuration and negligible carbon is lost as CO.

Original languageEnglish (US)
Pages (from-to)10-15
Number of pages6
JournalApplied Catalysis A: General
Volume475
DOIs
StatePublished - Apr 5 2014

Bibliographical note

Funding Information:
The authors acknowledge financial support from the National Science Foundation : Emerging Frontiers in Research and Innovation (EFRI) – Hydrocarbons from Biomass (award number: 0937706). SB acknowledges the National Science Foundation for a graduate research fellowship.

Keywords

  • Aldol condensation
  • Dehydration
  • Glycerol upgrading
  • Hydrogenation
  • Propanal

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