摘要
通过浸渍法以不同含量磷对Hβ分子筛进行改性,采用XRD,BET,NH_3-TPD,MAS NMR等手段对磷改性β分子筛样品进行表征,以乙基环己烷(ECH)为模型化合物考察其开环反应性能。结果表明:经磷改性后,适量磷的引入稳定了β分子筛骨架铝,明显提高了分子筛的水热稳定性及反应活性;随磷负载量的增加,β分子筛的相对结晶度、酸保留量、比表面积等均呈先增加后减少的趋势;反应活性、丙烯收率也呈先增加后减少的趋势,当w(P_2O_5)/w(Al_2O_3)为1.15时,分子筛的水热稳定性及活性达到最优。
Hβ zeolites were modified by immersion method with different phosphorus content solu- tions. The physicochemical properties of the samples were characterized by XRD, BET, NH3- TPD, MAS NMR techniques. The ethyl cyclohexane was used as a model compound to investigate the ring opening performance of the catalysts. The results show that modification with suitable amount of phos- phorus can stabilize the framework aluminum of β zeolite, and improve the hydrothermal stability and activity. With the increase of the w（P2O5）/w（Al2O3）, the relative crystallinity, specific surface area and retained acid amount were first increased and then decreased, and the reactivity and propylene yield as well. When the w（P2O5）/w（Al2O3） is 1.15, the hydrothermal stability and activity of molecular sieves achieve the optimal.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2016年第8期7-12,共6页
Petroleum Processing and Petrochemicals
基金
中国石油化工股份有限公司科技开发合同项目(S111026)
关键词
磷改性
Β分子筛
环烷烃
开环
phosphorus modification
β zeolite
naphthene
ring opening
