Catalytic pyrolysis of several kinds of bamboos over zeolite NaY
Catalytic pyrolysis of several kinds of bamboos over zeolite NaY
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DOI：
10.1039/b510602h
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发表时间：
2006-02
期刊：
影响因子：
9.8
通讯作者：
W. Qi;Changwei Hu;Guiying Li;L. H. Guo;Yang Yang-Yang;Jingjie Luo;X. Miao;Y. Du
中科院分区：
文献类型：
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作者：
W. Qi;Changwei Hu;Guiying Li;L. H. Guo;Yang Yang-Yang;Jingjie Luo;X. Miao;Y. Du
以NaY分子筛为催化剂，在固定床反应器中，于773 K和873 K的惰性氮气气氛下，对慈竹、毛竹、硬竹和麻竹4种竹子进行了10 h的催化热解研究。在573-873 K的温度范围内，以50 K为间隔，研究了慈竹和毛竹热解温度对产物分布的影响。随着热解温度的升高，气体产物的产率增加，而液体产物的产率经历一个最大值，残渣量减少。在NaY催化剂存在下，4种样品在873 K时的液体产率由直接热解的19.7- 53.3wt%提高到64.1- 68.8wt%。此外，非催化液体含有许多物质，主要包括羧酸、羰基、内酯、酚和呋喃化合物，而催化液体含有显著减少数量的主要由羧酸和羰基化合物组成的物质，其中乙酸是主要组分。采用扫描电子显微镜（SEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）对催化剂在873 K下使用前后进行了表征。结果表明，在热解过程中，NaY催化剂与竹材的主要热解中间产物发生相互作用，导致竹材[111]和[220]晶面的损伤以及[311]晶面的增强，从而导致竹材的原位重构。
The catalytic pyrolysis of four kinds of bamboo, Neosinocalamus affinis, Pubescens, Bambusa rigida and Dendrocalamus latiflorus, was performed in a fixed bed reactor in an inert atmosphere of nitrogen at 773 K and 873 K for 10 h using zeolite NaY as catalyst. For Neosinocalamus affinis and Pubescens, the influence of pyrolysis temperature on the product distribution was also studied over the temperature range of 573–873 K at an interval of 50 K. As the pyrolysis temperature increases, the yield of gaseous products increases, while the yield of liquid products goes through a maximum value, and the amount of residue reduces. For the four kinds of samples, the liquid yield at 873 K increases to 64.1–68.8 wt% in the presence of NaY catalyst, in compared to that of 19.7–53.3 wt% from direct pyrolysis. In addition, the non-catalytic liquid contains numerous species including mainly carboxylic, carbonylic, lactonic, phenolic and furan compounds, while the catalytic liquid contains markedly reduced number of species composed mainly of carboxylic and carbonylic compounds, of which acetic acid is the major component. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS) were used to characterize the catalysts before and after use at 873 K. The results show that during the pyrolysis the NaY catalyst interacts with the primary pyrolysis intermediates of bamboos and thus leads to in situ reconstruction involving the impairment of [111] and [220] planes, and the enhancement of the [311] plane.