摘要
使用NaOH溶液对HZSM-5分子筛进行处理,利用粉-粒流化床快速热解实验装置,考察了经过不同时间碱处理的HZSM-5分子筛对神东煤热解产物分布的影响。结果表明:适当的碱处理能够在不破坏HZSM-5分子筛晶相结构的情况下在晶体内部引入介孔,且随着碱处理时间的延长,分子筛的介孔孔容、介孔比表面积增加,孔径分布变宽,总酸量先增大后减小。碱处理0.5h的HZSM-5分子筛催化时焦油中苯、甲苯含量最大,较原煤热解分别增加了268%、296%;碱处理2h的HZSM-5分子筛催化下热解气体总含量达到最大,较原煤热解增加了24.8%;碱处理4h的HZSM-5催化时焦油中萘及萘的同系物、多环芳烃(除萘类)含量最大,分别较原煤增加了92%、192%。
HZSM-5 zeolites were treated with NaOH solutions.Powder-particle fluidized bed reactor was used to investigate the effect of alkali-treated HZSM-5 zeolites with different treatment time on product distribution of Shendong coal pyrolysis.The results showed that a proper alkali treatment can introduce mesopores into the crystal without destroying its phase structure.The amount of mesopore volume and the specific surface area enhanced with increasing alkali treatment time.In addition,the pore size distribution became broader and the acidity reached a peak followed by a continuous decrease.The content of the benzene and toluene in tar derived from pyrolysis in the presence of 0.5h alkali-treated zeolite increased up to 268%and 296%compared to that of raw coal,respectively.In the case of 2h alkali-treated HZSM-5 used in pyrolysis,the total amount of the pyrolysis gas was the highest,which was 24.8%higher than that of raw coal.The highest content of naphthalene,naphthalene derivates and polycyclic aromatic hydrocarbon(excluding naphthalenes)in tar could be obtained from pyrolysis when 4h alkali-treated zeolite was exploited,which was about 92%and 192%higher than that of raw coal,respectively.
作者
张妮娜
张壮壮
李刚
徐龙
兰婷玮
高婷
马晓迅
ZHANG Nina;ZHANG Zhuangzhuang;LI Gang;XU Long;LAN Tingwei;GAO Ting;MA Xiaoxun(School of Chemical Engineering,Northwest University;International Science and Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources;Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy;Shaanxi Research Center of Engineering Technology for Clean Coal Conversion;Collaborative Innovation Center for Shanbei Energy and Chemical Industry Development,Xi’an 710069,Shaanxi,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2018年第12期4616-4624,共9页
Chemical Industry and Engineering Progress
基金
国家自然科学基金重点项目(21536009)
陕西省科技计划项目(2017ZDCXL-GY-10-03)
关键词
神东煤
催化热解
HZSM-5
碱处理
产物分布
Shendong coal
catalytic pyrolysis
HZSM-5
alkali treatment
product distribution
