Choreographing boron-aluminum acidity and hierarchical porosity in ☆BEA zeolite by in-situ hydrothermal synthesis for a highly selective methanol to propylene catalyst

被引：23
作者：
Ahmed, Mohamed H. M. [1 ,2 ]
Muraza, Oki [1 ,2 ]
Galadima, Ahmad [1 ,2 ]
Yoshioka, Masato [3 ]
Yamani, Zain H. [1 ,2 ]
Yokoi, Toshiyuki [3 ]
机构：
[1] King Fahd Univ Petr & Minerals, Ctr Excellence Nanotechnol, Dhahran 31261, Saudi Arabia
[2] King Fahd Univ Petr & Minerals, Chem Engn Dept, Dhahran 31261, Saudi Arabia
[3] Tokyo Inst Technol, Chem Resources Lab, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan
来源：
MICROPOROUS AND MESOPOROUS MATERIALS | 2019年 / 273卷
关键词：
Boron-aluminum acidity; Hierarchical pores; (star)BEA zeolite; In situ synthesis; Methanol to propylene; OLEFINS MTO REACTION; MOLECULAR-SIEVES; SAPO-34; CATALYSTS; DIMETHYL ETHER; COKE FORMATION; EU-1; ZEOLITE; CONVERSION; ZSM-5; H-ZSM-5; SPECTROSCOPY;
D O I：
10.1016/j.micromeso.2018.06.036
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
A successful incorporation of boron into (star)BEA zeolite framework has been achieved using a in situ hydrothermal synthesis in the presence of aluminum-(star)BEA seeds. Interestingly, the boron-(star)BEA crystals exhibited a cubic morphology with a remarkable decrease in the crystal size as compared with Al-(star)BEA seeds. The effect of boron addition on (star)BEA zeolite acidity was investigated by NH3-TPD and pyridine FTIR. The type of boron coordination in the framework of (star)BEA zeolite was observed by B-11 MAS NMR. The results confirmed the formation of tetrahedral (BO4) and trigonal (BO3) boron species. The catalyst with highest boron content (Si/B = 6) showed the best catalytic transformation of methanol to olefins and the lowest deactivation rate. Moreover, it showed the highest propylene selectivity of 60% as well as the highest propylene-to-ethylene ratio (P/E) of 7.5.
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收藏
页码：249 / 255
页数：7
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