K. Fang et al. / Journal of Molecular Catalysis A: Chemical 229 (2005) 51–58
57
cracked products were C3–C9 hydrocarbons and the similar
carbon number distribution was symmetrical centered at C6
over the three catalysts, indicating that n-dodecane carried
out a nearly ideal hydrocracking behavior. Besides, a trace
of hydrogenolysis reaction might occur on the nickel metal
surface because there were a very small amount of C1 + C2
and C10 + C11 presented in the cracked products. The lower
C3/C1 ratio and the more linear light hydrocarbons were ob-
tained on the Ni(cit)/AlMCM-41 catalyst (see Table 4), which
coincided with the enhanced metal/acid ratio and the degree
of branching of the dodecane isomers prior to cracking as
discussed above.
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4. Conclusions
The bifunctional Ni/AlMCM-41 catalysts have been pre-
pared by means of the wetness impregnation method us-
ing three different nickel precursors: nickel nitrate, alkaline
tetraamine nickel nitrate and nickel citrate. The mesostruc-
ture of AlMCM-41 was more readily destroyed in the al-
kaline tetraamine nickel nitrate solution due to the exis-
tence of a large amount of hydroxides, which accelerated
the hydrolysis reaction of the silanol groups. The cata-
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stronger metal–support interaction, higher metal dispersion
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Acknowledgement
The authors gratefully acknowledge the funding of this
project by National Key Fundamental Research and Devel-
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