National Engineering Research Center for Wood-based Resource Comprehensive Utilization, School of Engineering, Zhejiang A & F University, Hangzhou, Zhejiang 311300, China.
National Engineering Research Center for Wood-based Resource Comprehensive Utilization, School of Engineering, Zhejiang A & F University, Hangzhou, Zhejiang 311300, China.
Bioresour Technol. 2021 Feb;321:124461. doi: 10.1016/j.biortech.2020.124461. Epub 2020 Dec 1.
In this work, ammonia (NH) torrefaction pretreatment (ATP) was developed to optimize the nitrogen and oxygen element distribution of microalgae via the N-doping and oxygen removal reaction, which could obviously improve the potential use of microalgae as a feedstock for the production of N-heterocyclic chemicals through fast pyrolysis technology. The nitrogen content increased from 8.3% of raw microalgae to 11.51% at 300 °C of ATP, while the oxygen content decreased from 35.96% to 21.61%, because of the Maillard reactions. In addition, the nitrogen-doping ratio and oxygen removal ratio of ATP was much higher than the conventional nitrogen torrefaction pretreatment (NTP). With the increase of ATP torrefaction temperature or the pyrolysis temperature, the relative content of the N-containing compounds increased, while the O-containing compounds decreased. For the N-heterocyclic chemicals, higher pyrolysis temperature favored the formation of pyrroles, while inhibited the formation of pyridines and indoles.
在这项工作中，开发了氨（NH）热压预处理（ATP），通过 N 掺杂和氧去除反应优化微藻中氮和氧元素的分布，这可以明显提高微藻作为通过快速热解技术生产 N-杂环化学品的原料的潜在用途。氮含量从原始微藻的 8.3%增加到 ATP 的 300°C 的 11.51%，而氧含量从 35.96%降低到 21.61%，这是由于美拉德反应的原因。此外，ATP 的氮掺杂率和氧去除率均高于传统的氮热压预处理（NTP）。随着 ATP 热压温度或热解温度的升高，含氮化合物的相对含量增加，而含氧化合物的含量降低。对于 N-杂环化学品，较高的热解温度有利于吡咯的形成，而抑制了吡啶和吲哚的形成。
