Fast Pyrolysis of Opuntia ficus-indica (Prickly Pear) and Grindelia squarrosa (Gumweed)

Calvin Mukarakate, Mark Nimlos, Daniel Carpenter, Bryon Donohoe, Phillip Cross, Jesse Mayer, John Cushman, Bishnu Neupane, Glenn Miller, Sushil Adhikari

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations


Opuntia ficus-indica (prickly pear) and Grindelia squarrosa (gumweed) are two exceptionally drought tolerant plant species capable of growing in arid and semiarid environments. Additionally, they have unique cell wall structures. Prickly pear contains pectin and high levels of ash (16.1%) that is predominantly Ca and K. Gumweed has high levels of extractives that contain grindelic acid and monoterpenoids. The objective of this paper was to evaluate how these unique cell wall components alter the pyrolysis performance of prickly pear and gumweed. Using a tandem micropyrolyzer with GC-MS/FID/TCD, a detailed account of the product slate is given for products generated between 450 and 650 °C. Pyrolysis of prickly pear showed that the high levels of ash increase the amount of organics volatilized and shifted product pools, making it possible to generate up to 7.3% carbonyls vs 3.8% for Pinus taeda (loblolly pine) and 10.5% hydrocarbons vs 1.8% for pine depending on reaction conditions. Pyrolysis of gumweed showed that the extractives were volatilized at low temperatures and led to 17.7% grindelic acid and monoterpenoids derivatives in the condensed vapor phase. At high temperatures, the extractives and other biomass components are converted to aromatics and C5-C10 hydrocarbons, giving a total yield of 16.6%, and also generate large amounts of C2-C4 hydrocarbons, 11.3%.

Original languageAmerican English
Pages (from-to)3510-3518
Number of pages9
JournalEnergy and Fuels
Issue number3
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

NREL Publication Number

  • NREL/JA-5100-72061


  • biomass
  • gumweed
  • prickly pear
  • pyrolysis


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