کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1254685 | 971386 | 2015 | 5 صفحه PDF | دانلود رایگان |

Cu/SiO2 catalysts prepared by different methods have been investigated focusing on the influence of Cu+ on the catalytic performance. The composition, structure and copper valence state were characterized by means of BET, XRD, XPS, FTIR, N2O-titration. It was found that the Cu/SiO2 prepared by ammonia-evaporation (AE) method had much higher TOF value than that prepared by wetness-impregnation (WI) with the same THF selectivity. The higher TOF value was attributed to the coexistence of Cu+ and Cu0 species in the activated AE-Cu/SiO2, while only Cu0 species existing in the activated WI-Cu/SiO2. Researches suggest that Cu+ can adsorb and polarize the CO bond of DMM. It is concluded that Cu0 could be the main active site and the synergistic effect between Cu0 and Cu+ could contribute to hydrogenation of DMM to THF.
Cu/SiO2 catalyst prepared by ammonia-evaporation (AE) method has much higher TOF value than that prepared by wetness-impregnation (WI) with the different active copper species, indicating that Cu0 could be the main active site and the synergistic effect between Cu+ and Cu0 would further improve catalytic performance.Figure optionsDownload as PowerPoint slide
Journal: Chinese Chemical Letters - Volume 26, Issue 9, September 2015, Pages 1150–1154