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The effect of several reaction parameters on the catalytic pyrolysis of pubescens over zeolite NaY
Miao Xia,Hu Changwei *,Luo Jia,Yang Yu,Du Ying,Qi Weiyan,Li Guiying
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan
*Correspondence author
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Funding: 国家973项目基础研究项目,高等学校博士学科点专项科研基金（No.2007CB210203,20050610013）
Opened online:16 January 2009
Accepted by: none
Citation: Miao Xia,Hu Changwei,Luo Jia.The effect of several reaction parameters on the catalytic pyrolysis of pubescens over zeolite NaY[OL]. [16 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27941
 
 
The effects of zeolite NaY dosage, pyrolysis time and pyrolysis temperature on the pyrolysis of pubescens were investigated. It was found that the presence of zeolite NaY greatly enhanced the yield of liquid products and remodeled the distribution of the pyrolytic liquid products directing to a good selectivity to acetic acid, and different liquid monomers could be acquired by controlling the pyrolysis temperature and pyrolysis time. The increase of liquid yield could be attributed to the catalytically selective conversion of primary pyrolytic intermediates to form liquid products instead of the formation of gaseous products or coke in the absence of catalyst. It was shown that when the ratio of zeolite NaY/Pubescens was below 1:1, the decomposition of several intermediate species leading to gaseous products passed the high temperature reaction zone directly without being altered by the catalyst, leading to equivalent amount of gaseous products formed. When zeolite NaY/pubescens ratio increased over 1:1, those species leading to gaseous products by thermal decomposition underwent catalytic pyrolytic conversion and gave out liquid products. The deactivation of the zeolite NaY was also tested. Zeolite NaY was deactivated after four repeated runs. XRD (X-ray diffraction) results showed that several diffraction peaks of zeolite NaY were intensified while certain others were weakened by 10 hours pyrolysis at 873K. The deactivation of zeolite NaY was caused by the variation of the crystalline structure and the deposition of coke formed in the repeated runs as revealed by XRD and SEM.
Keywords:Zeolite NaY;Reaction parameters;Catalytic pyrolysis;Pubescens
 
 
 

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