کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
57037 | 47105 | 2009 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of hybrid (Ni-Mo)carbides/carbon-coated mesoporous materials and their catalytic properties for hydrocracking of intermediate paraffins (n-C8) Synthesis of hybrid (Ni-Mo)carbides/carbon-coated mesoporous materials and their catalytic properties for hydrocracking of intermediate paraffins (n-C8)](/preview/png/57037.png)
This work explores the structure and physical chemistry of hybrid materials formed by casting of carbon precursors (i.e., acrylonitrile, AN) in mesoporous MCM-41 type siliceous materials. After polymerization and carbonization hollow carbonaceous fibers were formed and these were impregnated with Ni and Mo salts, i.e., 2.8 atoms Mo/nm2 and Ni/(Ni + Mo) ratio equal to 0.5. The supported metal carbides were characterized by XRD, BET, NH3-TPD and HRTEM and evaluated for the catalytic hydrocracking of intermediate straight chain model paraffins (i.e. n-octane) at 673 K, P = 1 atm. The overall activity and selectivity of the NiMoC/PAN-P catalysts for n-C8 hydrocracking were distinct with respect to other catalysts of reference, i.e., NiMo/Al2O3. In particular, carbon nanofibers and lower hydrocarbons (i.e., from propane to n-heptane) are the products formed by the successive dehydrogenation, cracking and carbon atoms diffusion through the metal particles.
Journal: Catalysis Today - Volume 148, Issues 1–2, 30 October 2009, Pages 55–62