- Nitrogen doped carbon supported iron catalysts for highly selective production of 4,4′-diamino-2,2′-stilbenedisulfonic acid
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Nitrogen doped carbon supported iron catalysts were prepared from pyrolysis of a multidentate nitrogen ligand iron complex supported on chitosan at different temperature, and showed good performances in the reduction of 4,4′-dinitrostilbene-2,2′-disulfonic acid (DNS acid) to 4,4′-diamino-2,2′-stilbenedisulfonic acid (DSD acid) with hydrazine hydrate (N2H4·H2O) as reductant. Characterization results revealed that the iron is mainly present in the form of Fe2O3 and metallic iron nanoparticles. The doped N atoms functionalized as anchoring sites to stabilize iron nanoparticles, which endows the catalysts with excellent activity and superior reusability.
- Cao, Pengwei,Zhang, Hong-Yu,Yin, Guohui,Zhang, Yuecheng,Zhao, Jiquan
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- An active fluorescent yellow dye and its preparation method and application
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The invention discloses an active fluorescent yellow dye and a preparation method and an application thereof. The structure of the active fluorescent yellow dye is shown as a formula (I). The active fluorescent yellow dye provided by the invention has high color fastness, high fixation rate and high combination stability with fibers, and has excellent brightness when being applied to cellulosic fibers such as dyed cotton, hemp and artificial cotton. In the formula (I), X is Cl or F; n is 1or 2; and M is H or an alkali metal. R is selected from one of H and chemical bonds shown in the specifications.
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Paragraph 0036; 0037-0039
(2016/11/24)
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