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Updated: Dec 21, 2025

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
Published on: August 5, 2016
N-rich hydrochar derived from organic solvent as reaction medium generates toxic N-containing mineral in its pyrochar
Chao Jia1, Jiewen Luo1, Shicheng Zhang2
1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
Abstract:
Low-grade hydrochar is often thermally activated to produce pyrochar. However, the interaction between inherent metals and N element during hydrochar activation process has never been considered. Present study revealed that a highly toxic N-containing mineral (MCN, M: metal) can be formed in N-rich hydrochar-based pyrochar via N rearrangement and subsequent carbothermal reactions. This atypical hydrochar is mainly produced from organic wastes with K2CO3 or Na2CO3 (such as food waste) in an organic solvent medium. The CN- concentration of studied pyrochar can reach to 9807 mg/kg, which is mainly determined by content and type of metal in hydrochar. The low N conversion rate (<4.2%) indicates that formation of MCN is independent of N content in hydrochar. Essentially, formation of MCN can be significantly inhibited by FeCl3 via the anionic interactions between Fe and K salt. This discovery can likely offer a new guide for the application of N-rich hydrochar-based pyrochar.
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