Pyrolysis and catalytic upgrading of Citrus unshiu peel

Beom Sik Kim, Young Min Kim, Jungho Jae, Chuichi Watanabe, Seungdo Kim, Sang Chul Jung, Sang Chai Kim, Young Kwon Park

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


Ex situ catalytic pyrolysis of Citrus unshiu (. C. unshiu) peel was performed using a tandem μ-reactor-GC/MS consisting of two sequential furnaces. The pyrolyzates of C. unshiu peel, composed mainly of alcohols, ketones and furans produced in the 1st furnace of the reactor, were upgraded to aromatics by the use of catalysts in the 2nd furnace. Compared to wood powder, C. unshiu peel produced larger amounts of aromatics over HZSM-5(23). Among the various catalysts, HZSM-5(23) and HBETA(25) showed high aromatic yields, 6.78 C% and 9.69 C%, respectively. HBETA(25) produced large amounts of undesirable PAHs (3.59 C%). During the sequential catalytic upgrading test, the yield of BTEXs (benzene, toluene, ethylbenzene, xylenes) over HZSM-5(23) was reduced more slowly than that over HBETA(25) because of the slower deactivation of HZSM-5(23), which suggests that HZSM-5(23) is a more stable catalyst than the other catalysts used in this study during the sequential catalytic upgrading of C. unshiu peel pyrolyzates.

Original languageEnglish
Pages (from-to)312-319
Number of pages8
JournalBioresource Technology
StatePublished - 1 Oct 2015


  • Catalytic upgrading
  • Citrus unshiu peel
  • HZSM-5
  • Tandem μ-reactor-GC/MS


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