Non-thermal plasma assisted synthesis and physicochemical characterizations of Co and Cu doped Ni/Al2O3 nanocatalysts used for dry reforming of methane |
| |
Authors: | Nader Rahemi Mohammad Haghighi Ali Akbar Babaluo Mahdi Fallah Jafari Sirous Khorram |
| |
Affiliation: | 1. Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran;2. Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran;3. Nanostructure Material Research Center (NMRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran;4. National Iranian Oil Refining & Distribution Company (NIORDC), National Iranian Oil Company (NIOC), P.O. Box 15815-3499, Tehran, Iran;5. Research Institute for Applied Physics and Astronomy (RIAPA), University of Tabriz, P.O. Box 51665-163, Tabriz, Iran |
| |
Abstract: | Ni/Al2O3 nanocatalysts doped with Co and Cu were prepared by co-impregnation and modified by non-thermal plasma. The nanocatalysts were characterized by XRD, FESEM, TEM, EDX dot-mapping, BET, FTIR, TGA-DTG, and XPS analysis. According to XRD and XPS results, good interaction between active phase and support can be observed in both Ni–Co/Al2O3 and Ni–Cu/Al2O3 nanocatalysts. A uniform morphology, high surface area, and well dispersed particles of active sites in Ni–Co/Al2O3 nanocatalyst were observed that shows the effect of cobalt in controlling Ni ensemble size. In contrast Ni–Cu/Al2O3 nanocatalyst had no homogenous dispersion of active phase due to sintering of copper particles. The activity measurements illustrated better Ni–Co/Al2O3 nanocatalyst activity in comparison to Ni/Al2O3 and Ni–Cu/Al2O3 in terms of CH4 and CO2 conversion. H2 and CO yield were higher for Ni–Co/Al2O3 and higher H2/Co ratio was obtained as well. Whereas Ni/Al2O3 and Ni–Co/Al2O3 did not experience deactivation, Ni–Cu/Al2O3 suffered from activity loss by ca. 22% and 16% for CH4 and CO2 conversion, respectively. Sintering most likely happened in Ni–Cu/Al2O3 nanocatalyst due to high temperature of calcination while cobalt by controlling the size of Ni particles, alternated the size of active sites to a size range in which carbon formation was suppressed. Ni/Al ratio from XPS analysis which signifies Ni dispersion on alumina support was 5.15, 9.16, and 6.35 for Ni/Al2O3, Ni–Co/Al2O3, and Ni–Cu/Al2O3 nanocatalysts respectively. The highest ratio of Ni/Al was for Ni–Co/Al2O3 nanocatalyst that shows the best coverage of support by Ni active phase in this nanocatalyst. |
| |
Keywords: | Dry reforming of methane Synthetic gas Ni/Al2O3 Ni&ndash Co/Al2O3 Ni&ndash Cu/Al2O3 Non-thermal plasma |
本文献已被 ScienceDirect 等数据库收录! |
|