介孔材料
化学
溴化物
催化作用
沸石
化学工程
再结晶(地质)
十二烷
分子筛
MCM-41
肺表面活性物质
吸附
催化裂化
无机化学
核化学
有机化学
古生物学
工程类
生物
生物化学
作者
Jindan Na,Guozhu Liu,Tianwei Zhou,Guangya Ding,Shenlin Hu,Li Wang
标识
DOI:10.1007/s10562-013-0963-0
摘要
ZSM-5/MCM-41 zeolite composites with varying mesopore sizes were prepared through alkali-desilication and surfactant-directed recrystallization with different chain length of alkyltrimethylammonium bromide. XRD and TEM revealed that the composites possessed the characteristics of both ZSM-5 and mesoporous MCM-41 with hexagonal symmetry. N2-adsorption–desorption, 27Al MAS NMR, NH3-TPD and in situ FT-IR results suggested that the sizes of the mesopores and the accessibility of acid sites could be affected greatly by the chain length of alkyltrimethylammonium bromide used. Catalytic cracking of n-dodecane over ZSM-5/MCM-41 composites was studied in the form of coatings on the inside of a tubular reactor at 550 °C and 4 MPa. The conversion of n-dodecane increased gradually with increasing the mesopore sizes of ZSM-5/MCM-41 composites, implying a positive effect of the mesopores on the diffusion inside pore channels and the accessibility of acid sites by the reactants.
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