کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
50087 | 46779 | 2012 | 4 صفحه PDF | دانلود رایگان |
Two catalysts, Ni/SBA-15 and Ni/MgO were prepared by wet impregnation technique with 5 wt.% Ni loading in each catalyst. These were tested for nitrobenzene hydrogenation to aniline reaction under vapor phase at atmospheric pressure. Ni/MgO suffered a huge loss in the activity (conversion) during time on stream study even though the Ni dispersion is larger compared to that in SBA-15 supported catalyst. TPR studies of used catalysts confirm coking of the catalysts. The superior catalytic activity in terms of conversion and selectivity during time on stream operation exhibited by Ni/SBA-15 catalyst is due to the hydrophobic nature of this catalyst (resistant to water generated during the reaction) and the effect of coking is not significant.
Hydrophobic nature of SBA-15 makes Ni/SBA-15 an ideal catalyst for nitrobenzene hydrogenation to aniline.Figure optionsDownload as PowerPoint slideHighlights
► The hydrophobic nature of SBA-15 makes Ni/SBA-15 a robust catalyst.
► Deactivation of Ni/MgO is due to adsorption of water generated during the reaction.
► The role of carbon deposition during the reaction is insignificant on the activity.
► Strong interaction between Ni and MgO favors higher Ni dispersion.
Journal: Catalysis Communications - Volume 18, 10 February 2012, Pages 89–92