Synthesis,characterization and catalytic properties of mesoporous MCM-48 containing zeolite secondary building units |
| |
Authors: | Li Qiang Dou Tao Zhang Ying Li Yuping Wang Shan and Sun Famin |
| |
Affiliation: | (1) The CNPC Key Laboratory of Catalysis, China University of Petroleum, Beijing, 102249, China;(2) Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, 030024, China;(3) Institute of Daqing Petro Chemical, Daqing, 163714, China |
| |
Abstract: | Mesoporous aluminosilicate MCM-48 containing zeolite secondary building units in the pore wall has been synthesized in alkaline
media with a two-step procedure. The aluminosilicate precursors comprising zeolite secondary building units were first synthesized
by carefully controlling reaction conditions and then were assembled using co-templates of gemini surfactant C18H37N(CH3)2(CH2)3-N(CH3)2C18H37]2+ (18-3-18) and triethanolamine (TEA). X-ray Diffraction (XRD) patterns of the as-made samples indicated that highly ordered
mesostructured MCM-48 was formed. Transmission Electron Microscopy (TEM) images further verified the formation of MCM-48 with
uniform cubic pore channel system having the pore opening diameter of about 25 ?. Compared with the conventionally synthesized
MCM-48, the as-synthesized MCM-48 sample showed an adsorption band at 520–600 cm−1 in its FT-IR spectrum, which was assigned to five-membered ring vibration from zeolite structure. This suggested the presence
of zeolite building units in the pore wall. N2 adsorption data showed that the material had a much higher specific surface area (1 200 m2/g) than the conventional MCM-48(1 100 m2/g). Finally, the catalytic performance of the as-made MCM-48 was evaluated by hydrogenation dealkylation reaction of heavy
aromatic hydrocarbons. Catalytic results showed that the as-made MCM-48 catalyst exhibited higher conversion than the conventional
MCM-48 catalyst. The as-made mesostructured MCM-48 may have a potential catalytic application in the conversion of bulky molecules.
Translated from Journal of Fuel Chemistry and Technology, 2006, 34(1): 105–108 译自: 燃料化学学报] |
| |
Keywords: | MCM-48 zeolite secondary building units triethanolamine heavy aromatic hydrocarbons |
本文献已被 万方数据 SpringerLink 等数据库收录! |
|