SMFs-supported Pd nanocatalysts in selective acetylene hydrogenation: Pore structure-dependent deactivation mechanism |
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| Authors: | Elaheh Esmaeili Ali Morad Rashidi Yadollah Mortazavi Abbas Ali Khodadadi Mehdi Rashidzadeh |
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| Institution: | 1. Birjand University of Technology, Department of Chemical Engineering, P. O. Box 97175/569, Birjand, Iran;2. Catalysis and Nanostructured Materials Research Laboratory, School of Chemical Engineering, University of Tehran, Tehran 14155/6619, Iran;3. Research Institute of Petroleum Industry (RIPI), West Blvd. Azadi Sport Complex, P. O. Box: 14665 1998, Tehran, Iran |
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| Abstract: | In the present study, CNFs, ZnO and Al2O3 were deposited on the SMFs panels to investigate the deactivation mechanism of Pd-based catalysts in selective acetylene hydrogenation reaction. The examined supports were characterized by SEM, NH3-TPD and N2 adsorption-desorption isotherms to indicate their intrinsic characteristics. Furthermore, in order to understand the mechanism of deactivation, the resulted green oil was characterized using FTIR and SIM DIS. FTIR results confirmed the presence of more unsaturated constituents and then, more branched hydrocarbons formed upon the reaction over alumina-supported catalyst in comparison with the ones supported on CNFs and ZnO, which in turn, could block the pores mouths. Besides the limited hydrogen transfer, N2 adsorption-desorption isotherms results supported that the lowest pore diameters of Al2O3/SMFs close to the surface led to fast deactivation, compared with the other catalysts, especially at higher temperatures. |
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| Keywords: | selective hydrogenation alloy formation acidic site pore structure SMFs-supported Pd nanocatalysts |
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