摘要
在高温焙烧高岭土微球(高土球)、偏高岭土微球(偏土球)混合晶化体系中,在合成配比不变的条件下,利用现有合成体系对高土球进行预处理制备了高结晶度NaY/高岭土复合微球,并对反应性能进行了考察。实验结果表明,偏土球预处理将导致复合微球中Y型分子筛结晶度下降,而高土球预处理有利于提高结晶度,当高土球在90℃预处理4h时,可将复合微球的结晶度从直接合成的26%提高到37%,同时复合微球的孔体积,比表面积以及外比表面积均明显增加;与直接合成相比,采用预处理法获得的高结晶度微球所制备的催化剂,具有更强的重油转化能力和更优的产品分布。
NaY/kaolin composite microspheres were prepared through mixed microspheres of fully calcined kaolin and metakaolin by pre-treatment of kaolin microspheres with the existing synthesis system,whose catalytic performance on the conversion of heavy oil were also investigated.The results showed that the crystallinity of Y-zeolite in the composite decreased after the pre-treatment of metakaolin microspheres,while that was improved after the pre-treatment of fully calcined kaolin microspheres.When the fully calcined kaolin spheres were pre-treated at 90℃for 4 h,the crystallinity of composite microspheres increased from 26%to 37%,while the pore volume,specific surface area and external specific surface area of the composite microspheres also had an increase.Evaluation results indicated that using the catalyst prepared by pre-treatment method hereby led to an comparatively higher heavy oil conversion and better product distribution comparing with that of the catalyst obtained by direct synthesis.
作者
熊晓云
朱夔
高雄厚
胡清勋
Xiong Xiaoyun;Zhu Kui;Gao Xionghou;Hu Qingxun(PetroChina Lanzhou Petrochemical Research Center,Lanzhou Gansu 730060,China;PetroChina Lanzhou Petrochemical Company,Lanzhou Gansu 730060,China)
出处
《石油化工》
CAS
CSCD
北大核心
2021年第6期511-516,共6页
Petrochemical Technology
基金
中国石油天然气股份有限公司科技专项(2018E-03)。
关键词
原位晶化
NAY分子筛
结晶度
孔结构
高岭土
微球
in-situ crystallization
NaY zeolite
crystallinity
pore structure
kaolin
microsphere
