Enriching pyrrole components in bio-oil by nitrogen-rich pyrolysis of tobacco stem employing ZIF-67/ZSM-5 dual-catalyst

IF 5.8 2区 化学 Q1 CHEMISTRY, ANALYTICAL
Xiaoyu Song , Shanjian Liu , Tianhao Li , Hui Wang , Fupeng Huang , Xueyuan Bai , Dongmei Bi
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Abstract

Traditional pyrrole preparation methods have challenges such as operational complexity, harsh conditions. In this study, This study proposes a strategy for the preparation of pyrrole via nitrogen-rich catalytic pyrolysis of tobacco stems (TS) using a ZIF-67/ZSM-5 dual-catalyst system. Using urea as the exogenous nitrogen source, the in-situ catalytic pyrolysis experiment was carried out in a horizontal tube furnace, the mass ratio of the reaction raw materials (tobacco stem, urea and catalyst) was 5: 3: 5, the air was purged with argon gas before the reaction, the pyrolysis temperature was set to different gradients for the experiment, and the pyrolysis time was fixed at 15 min. Experimental data revealed that, with a 60 % addition of external nitrogen (urea) and a 4:1 molar ratio of ZIF-67, the ZIF-67/ZSM-5 dual catalyst achieved a notable increase in bio-oil yield, reaching 39.6 wt% at 450 ℃. Pyrrole compounds accounted for 45.5 wt% of the total, and the selectivity of nitrogen-containing compounds was remarkably high at 68.9 %. Compared with the pyrolysis of ZIF-67 and ZSM-5 alone, the relative content of pyrrole compounds increased by 7.1 % and 10.4 %, respectively. The ZIF-67 catalyst promotes redox and coordination catalysis to enhance the production of pyrrole precursors such as furans, hydroxyacetone, and aldehydes, ultimately increasing the relative content of Pyrrole compounds. Meanwhile, Utilizing acid catalysis and sieve properties, ZSM-5 suppresses dehydrogenation and nitrile formation. Therefore, the ZIF-67/ZSM-5 dual catalyst can effectively utilize the renewable waste TS and efficiently prepare the high-value chemical pyrrole.
ZIF-67/ZSM-5双催化剂富氮热解烟叶生物油中吡咯成分富集研究
传统的吡咯制备方法存在操作复杂、条件苛刻等问题。本研究提出了一种利用ZIF-67/ZSM-5双催化剂体系通过富氮催化热解烟草茎(TS)制备吡罗的策略。以尿素为外源氮源,在水平管式炉中进行原位催化热解实验,反应原料(烟茎、尿素和催化剂)的质量比为5:3:5,反应前用氩气吹扫空气,实验热解温度设置不同梯度,热解时间固定为15 min。实验数据表明,当外部氮(尿素)添加量为60% %,ZIF-67摩尔比为4:1时,ZIF-67/ZSM-5双催化剂的生物油收率显著提高,在450℃时达到39.6 wt%。吡咯类化合物的选择性为45.5 wt%,含氮化合物的选择性为68.9% %。与单独热解ZIF-67和ZSM-5相比,热解产物中吡咯类化合物的相对含量分别提高了7.1 %和10.4 %。ZIF-67催化剂促进氧化还原和配位催化,促进呋喃、羟丙酮和醛等吡咯前体的生成,最终提高吡咯化合物的相对含量。同时,ZSM-5利用酸催化和筛分性能抑制脱氢和腈的生成。因此,ZIF-67/ZSM-5双催化剂可以有效利用可再生废TS,高效制备高值化工吡咯。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.10
自引率
11.70%
发文量
340
审稿时长
44 days
期刊介绍: The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.
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