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| Pt-K/Al2O3 dehydrogenation catalyst for synthesis of o-phenyl phenol(Ⅱ):catalyst deactivation mechanism |
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LI Yan-peng1,2, LIU Da-peng2, LIU Chen-guang1,2
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(1.State Key Laboratory of Heavy Oil Processing in China University of Petroleum, Qingdao 266580, China;2.CNPC Key Laboratory of Catalysis in China University of Petroleum, Qingdao 266580, China)
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| Abstract: |
| The possible deactivation mechanism of Pt-K catalyst was investigated by means of thermogravimetry-differential thermal analysis (TG-DTA), elemental analysis, H2-O2 titration (HOT), scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). The results show that carbon deposition is not the key factor of catalyst deactivation. The size of Pt particles hardly changes before and after reaction, and the Pt agglomeration may not be the key factor of catalyst deactivation either. For the Pt-K/Al2O3 catalyst, the Pt dispersion clearly reduces after reaction and can not be recovered even after regeneration. The deactivation of Pt-K/Al2O3 catalyst is attributed to the over-coverage effect of potassium species on the Pt active sites during the reaction. |
| Key words: catalyst o-phenyl phenol dehydrogenation Pt K Al2O3 deactivation |
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