摘要
将P改性用于甲醇制丙烯(MTP)反应ZSM-5分子筛的改性研究,以提高丙烯选择性和分子筛活性稳定性。采用XRD、SEM和NH_3-TPD表征催化剂物化性能。对不同硅铝比ZSM-5分子筛P改性研究发现,3种不同硅铝物质的量比(50、150和300)ZSM-5分子筛进行P改性时,在n(P)∶n(Al)=0.5~0.7时,ZSM-5分子筛改性后丙烯选择性和寿命得到提升。研究分子筛晶粒尺寸与P负载量关系时发现,随着分子筛晶粒尺寸的增大,位于分子筛表面的P含量逐渐增加,并且分子筛晶粒越小,最佳的P负载量越小。
In order to improve the selectivity to propylene and zeolite stability,ZSM-5 zeolites for methanol to propylene were modified by phosphorus.The physicochemical properties of the resulting samples were characterized by XRD,SEM and NH3-TPD.Screening and optimizing modification conditions were carried out to clarify the relationships between the properties of zeolites and the modification conditions.The results showed that after ZSM-5 zeolites with SiOJAl_(2)O_(3)molar ratios of 50,150 and 300 were modified by using P and controlling P/A1 molar ratio of 0.5-0.7 in ZSM-5 zeolites,the selectivity to propylene and zeolite stability were enhanced.With the enhancement of crystal size of ZSM-5 zeolites,the content of P on the surface of the zeolites increased gradually;the smaller the crystal size of ZSM-5 zeolite is,the lower the optimal P loading is.
作者
顾洪歌
吴志杰
窦涛
Gu Hongge;Wu Zhijie;Dou Tao(State Key Laboratory of Heavy Oil Processing,Key Laboratory of Catalysis of CNPC,China University of Petroleum-Beijing,Beijing 102249,China)
出处
《工业催化》
CAS
2017年第2期18-26,共9页
Industrial Catalysis
基金
国家自然科学基金(21206192,U1662131)资助项目
高等学校博士学科点专项科研基金(新教师类)(20120007120010)资助项目
关键词
催化化学
甲醇制丙烯
ZSM-5分子筛
酸催化
磷改性
catalytic chemistry
methanol to propylene
ZSM-5 zeolite
acid catalysis
P modification
