共查询到20条相似文献,搜索用时 31 毫秒
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《Journal of Sulfur Chemistry》2013,34(2):131-142
This paper describes the preparation of alumina fibers doped with CaO, MgO and La2O3 and reports their use as SO2 adsorbents. These materials were characterized using electron microscopy, powder X-ray diffraction and infrared analysis and were examined for their ability to capture SO2 selectively from gas mixtures containing large quantities of H2O, CO2 and some O2 at temperatures in excess of 353 K. Overall, it was found that these adsorbents could remove SO2 selectively and that they could be regenerated by treatment with an H2S-containing gas at approximately 600 K. Adsorption capacity was retained over several cycles. Fourier transform infrared analysis showed that SO2 was adsorbed as free SO2 and also in a combined form as sulfite and sulfate species. In the regeneration step, the adsorbed sulfur species were reduced to elemental sulfur and H2S or were desorbed as SO2. It is proposed that the chemistry described here could be applied to design of a process for capture of all sulfur species typically found in a Claus-based sulfur recovery system. 相似文献
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《Journal of Sulfur Chemistry》2013,34(1):85-91
Phosphorus pentoxide supported on silica gel (P2O5/SiO2) efficiently acts as a highly active and reusable catalyst for cyclic and non-cyclic S,S-acetalization of a variety of carbonyl compounds under mild, solvent-free and ambient conditions. This method offers significant advantages such as high conversion, clean work-up, short reaction times and simplicity in operation. 相似文献
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《Journal of Sulfur Chemistry》2013,34(1):93-98
Selective oxidation of aromatic and aliphatic sulfides to the corresponding sulfoxide was achieved by using POCl3/H2O2 and (alumina-supported phosphorus oxychloride)/H2O2. A versatile procedure for the oxidation of sulfides to sulfoxides without any over-oxidation to sulfones has been reported. It is noteworthy that the reaction is clean and tolerates oxidatively sensitive functional groups and the sulfur atom is selectively oxidized. 相似文献
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《Journal of Sulfur Chemistry》2013,34(2):117-122
An efficient Zn/AlCl3-promoted highly regioselective one-pot procedure has been demonstrated for the synthesis of β -amino selenides and sulfides from a variety of diselenides/disulfides and aziridines by reductive cleavage of Se–Se and S–S bonds using the Zn/AlCl3 system in acetonitrile under very mild conditions. 相似文献
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《Journal of Sulfur Chemistry》2013,34(1):55-61
The reaction of isatin-3-thiosemicarbazone (ITC, 1) or isatin-3-semicarbazone (ISC, 2) with nitrato bis(triphenylphosphine)copper(I) gave the four coordinate copper(I) complexes [Cu(PPh3)2(ITC)]NO3 (3) and [Cu(PPh3)2(ISC)]NO3 (4). The synthesized complexes were characterized by FT-IR, UV–VIS, Raman and elemental analysis. The crystal structure of 3 was investigated by single crystal X-ray diffraction. The ITC coordinates to the copper(I) ion in a bidentate fashion via the N(imine) and S atoms which along with two triphenylphosphine ligands form a tetracoordinate complex. The complex has a distorted tetrahedral coordination environment. Crystal data at 150.0 K: space group P21/c with a=12.5777(4), b=15.2062(5), c=21.9057(7) Å, β=95.628(3)o, Z=4, R 1=0.049. 相似文献
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《Journal of Sulfur Chemistry》2013,34(6):599-610
An efficient, general, and atom-economic synthesis of organoammonium thioselenophosphinates has been developed by exploiting a three-component reaction between secondary phosphine sulfides, elemental selenium, and various amines. The reaction proceeds under mild conditions (70–75 °C, 1 h, EtOH) to afford thioselenophosphinates in 77–94% yields. 相似文献
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《Journal of Sulfur Chemistry》2013,34(2):159-169
Mono- and dinuclear complexes of the type M(cys), M(PTD)2 and M2(PTD)4, where M=Pd (II) or Pt(II), cys=(SCH 2CH (NH 2)COOH)2 and PTD=pyrrolidine thiocarbanoyl disulfide, have been prepared through oxidative addition reaction. They are characterized by microanalyses of metal content, molar conductance, magnetic measurements, infrared and UV–visible spectral studies. The experimental infrared data are supported by density functional theory (DFT) calculations using the B3LYP level of theory and LANL2DZ basis set. The vibrational frequencies of the molecules were computed using the optimized geometry obtained from the DFT calculations. The diamagnetic nature, the electronic spectral studies and calculated geometries suggest a distorted square planner environment around Pd(II) and Pt(II) complexes. 相似文献