Evaluation of PtPd-modified Zeolite Catalysts (ZSM-5, Beta, USY) for Pyrolysis of Jatropha Waste

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  • Murata Kazuhisa
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology Japan Science Technology Agency (JST)
  • Khongwong Wasana
    Thailand Institute of Scientific and Technological Research (TISTR) Japan Science Technology Agency (JST)
  • Larpkattaworn Siriporn
    Thailand Institute of Scientific and Technological Research (TISTR) Japan Science Technology Agency (JST)
  • Liu Yanyong
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology
  • Inaba Megumu
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology
  • Takahara Isao
    Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology

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  • ジャトロファ廃材の熱分解におけるPtPd修飾ゼオライト（ZSM-5，ベータ，USY）の効果

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Abstract

Fast pyrolysis with three typical modified zeolite catalysts was evaluated to produce bio-oil from Jatropha waste. Jatropha waste was pyrolyzed in a stainless-steel reactor at 600 °C under N2 gas flow. The aromatic hydrocarbon selectivity in the bio-oil was in the order: PtPd/ZSM(30) (73.7 %)>PtPd/Beta(22.5) (68.6 %)>PtPd/USY(20) (48.7 %), where the weight ratio of Jatropha/catalyst was 1. In addition, catalyst regeneration was carried out to study the catalyst efficiency. The analysis of fresh and regenerated catalysts by XRD, NH3-TPD, and TG/DTG, as well as product selectivity and surface properties showed that coke deposition and removal were associated with the zeolite structure and surface acid property. Due to pore size regulation, H-ZSM-5 with 10-membered ring (10 MR) could promote the pyrolysis reaction on the outside surface rather than in the inside channels. In USY zeolite with 12 MR, the reaction could occur inside the channels, but the moderate acid nature resulted in only slightly developed coke formation, which could be removed, at least partly, after regeneration. In beta zeolite with 12 MR, the total amount of surface acidity was more than twice that of USY, which undergoes more condensed coke formation, and was more difficult to remove by regeneration than the coke over USY. Thus, under these pyrolysis conditions, PtPd/ZSM(30) seems to be a better candidate for pyrolysis of Jatropha waste compared to PtPd/Beta(22.5) and PtPd/USY(20).

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