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<p>Conversion of nitrogen-rich tobacco stem (TS) to nitrogen-containing compounds (NCCs) via two-step hydrothermal liquefaction process over metal-modified HZSM-5 zeolite was studied for the first time. The results showed that HZSM-5 could promote the generation of NCCs, and the relative content of NCCs reached 64.13%. The modified HZSM-5 did not stimulate the NCCs in bio-oil as effectively as the unmodified HZSM-5. However, metal-modified HZSM-5 exhibited significant selectivity toward nicotine in bio-oil, up to 27.17% over Cu/HZSM-5, while exhibited lower coking rates. Finally, the possible reaction mechanism for the formation of NCCs from TS and urea was proposed. This work proposes a novel strategy for preparing NCCs through synergistic utilization of biomass and urea.</p>

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Selective Regulation of Nitrogen-containing Compounds from Nitrogen-rich Tobacco Stem via Two-step Hydrothermal Liquefaction Over Metal-modified Zeolite

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Xianyun Wei,
  • Jing Bai,
  • Wangwei Qiao,
  • Lefei Li,
  • Zheng Yan,
  • Haoran Wu,
  • Chun Chang

摘要

Conversion of nitrogen-rich tobacco stem (TS) to nitrogen-containing compounds (NCCs) via two-step hydrothermal liquefaction process over metal-modified HZSM-5 zeolite was studied for the first time. The results showed that HZSM-5 could promote the generation of NCCs, and the relative content of NCCs reached 64.13%. The modified HZSM-5 did not stimulate the NCCs in bio-oil as effectively as the unmodified HZSM-5. However, metal-modified HZSM-5 exhibited significant selectivity toward nicotine in bio-oil, up to 27.17% over Cu/HZSM-5, while exhibited lower coking rates. Finally, the possible reaction mechanism for the formation of NCCs from TS and urea was proposed. This work proposes a novel strategy for preparing NCCs through synergistic utilization of biomass and urea.