کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
176791 | 458956 | 2012 | 6 صفحه PDF | دانلود رایگان |
Gold nanoparticles supported on three metal oxides, TiO2, Al2O3 and Fe2O3, were prepared by a modified precipitation-deposition method using urea as an additive. These catalysts were tested in chemoselective reduction of 4,4′-dinitrostilbene-2,2′-disulfonic acid to 4,4′-diaminostilbene-2,2′-disulfonic acid. Three reagents, hydrogen, carbon monoxide, and sodium formate, were employed as reductants. It was found that >94% of the nitrostilbene was transformed into the aminostilbene without the reduction of olefinic group. In addition, these catalysts exhibited stable performance after regeneration by calcination at 400 °C for 5 h. This clean approach provides a promising application for synthesis of amino substituted stilbene sulfonic acid on an industrial scale.
Selective production of 4,4′-diaminostilbene-2,2′-disulfonic acid (DSD) from 4,4′-dinitrostilbene-2,2′-disulfonic acid (DNS) without any olefinic group was reduced feasible by catalytic reduction over supported nano-sized gold catalysts with different hydrogen resources, which uncovers a clean synthetic approach for useful aromatic sulfonic stilbene.Figure optionsDownload as PowerPoint slideHighlights
► Gold nanoparticles with similar average diameters were supported on three metal oxides.
► H2, CO, and HCOONa were used as clean reductants.
► Good selectivity (>94%) between nitro and olefinic group reduction was obtained.
► The catalytic activity can be restored by calcination at 400 °C.
Journal: Dyes and Pigments - Volume 95, Issue 2, November 2012, Pages 215–220