化工进展Issue(2)：413-418,6.DOI:10.16085/j.issn.1000-6613.2015.02.018
硅含量对氯甲烷制取低碳烯烃的SAPO-34分子筛酸性的影响
Synthesis of SAPO-34 catalyst with different silicon contents and their catalytic performance in chloromethane to olefins
孔令涛 1沈本贤 1蒋章1
作者信息
- 1. 华东理工大学化学工程联合国家重点实验室，上海 200237
- 折叠
摘要
Abstract
SAPO-34 molecular sieves with different Si contents were synthesized and used as catalysts for conversion of chloromethane to light olefins. The influences of different Si amounts on crystalline structures,morphology features,textural properties and acidity of SAPO-34 samples were characterized with XRD,NH3-TPD,and29Si MASNMR. Uniform SAPO-34 cubic crystals could be formed when ratio of Si/Al was in the range of 0.10—0.80. When ratio of Si/Al was 0.6,relative crystallinity of SAPO-34 sample was the highest,microporous specific surface area was 588m2/g,and microporous volume was 0.267cm3/g. NH3-TPD results showed that when ratio of Si/Al was gradually increasing from 0.05 to 0.60,acid strength and acid amount were obviously enhanced,and acid strength was increasd with decreasing weak acid amounts when ratios of Si/Al was increased from 0.60 to 1.0. When conversion of chloromethane to light olefins was performed over SAPO-34 catalysts at 425℃,activity and stability of SAPO-34 catalysts were gradually improved with increasing ratio of Si/Al while selectivities of propene and ethene were slightly decreasing due to aggravated secondary reactions.关键词
硅含量/SAPO-34/酸性质/氯甲烷/低碳烯烃Key words
silicon content/SAPO-34/acidity/chloromethane/light olefins分类
化学化工引用本文复制引用
孔令涛,沈本贤,蒋章..硅含量对氯甲烷制取低碳烯烃的SAPO-34分子筛酸性的影响[J].化工进展,2015,(2):413-418,6.
