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Synthesis of Ionic Liquid Mediated Nanoparticle Synthesis
Published in Nandakumar Kalarikkal, Sabu Thomas, Obey Koshy, Nanomaterials, 2018
Praveenkumar Upadhyay, Vivek Srivastava
The well-crystalline, distinct, small and longtime stable Pt-nanocrystal synthesis was carried out by thermal, photolytic or microwave assisted decomposition of the air/moisture stable organometallic Pt(IV) precursor (MeCp)PtMe3 in following IL reaction medium [BMIm][BF4] and [BtMA][Tf2N] (full name of IL should be entered). IL mediated Pt NPs (0:0125 mol:%) offered the biphasic hydrosilylation of phenylacetylene with triethylsilane, which leads to give the distal and proximal products triethyl (2- and 1-phenylvinyl) silane with TOF 96,000 h-1.63 The catalytically sound and active Pt (0) (2.3 nm size) was obtained by controlling thermal decomposition of the organometallic precursor Pt2(dba)3 (dba = dibenzylideneacetone) in reported [BMIM][BF4] and [BMIM][PF6], IL medium.44, 45 Pt NPs also synthesized from H2Pt(OH)6 and formic acid in [BMIm][FEP] (FEP = tris(pentafluoroethyl) trifluorophosphate) which offers chemo selective hydrogenation of 3-nitrostyrene (yields exceeding 90%). Recyclability of Pt NPs found while immobilizing on solid SiO2 or supported carbon nanotube (CNTs).64–67 Pt sputtering without stabilizing agents onto the IL trimethyl-n-propylammonium bis((trifluoromethyl) sulfonyl)amide [Me3PrN][Tf2N] produce Pt NPs of mean particle diameters of ca. 2.3-2.4 nm but they are independent of sputtering time.69 Without any pretreatment of SWCNTs or any chemical reagent, the Pt-NP-SWCNT composites was achieved by using the Pt sputtered ILs and the Pt-NP immobilization onto single-walled carbon nanotubes.70
Rhodium(I) complexes with N-heterocyclic carbene ligands: synthesis, biological properties and catalytic activity in the hydrosilylation of aromatic ketones
Published in Journal of Coordination Chemistry, 2021
Naceur Hamdi, Ichraf Slimani, Lamjed Mansour, Faisal Alresheedi, Ismail Özdemir, Nevin Gürbüz
First, the reaction of acetophenone with triethylsilane in the presence of 3a–f as catalysts was investigated. All catalysts produced hydrosilylation products at conversion rates ranging from 70 to 98% (Table 2, entries 1–18). Then, in the presence of 3a–f, o-methoxyacetophenone and p-fluoroacetophenone were reacted with triethylsilane under the same conditions (Table 2, entries 7–18). The most straightforward conversion (96% and 98%) was obtained with catalysts 3b and 3c to provide corresponding silyl ethers, when o-methoxyacetophenone was used as the substrate. In the hydrosilylation of acetophenone derivatives with triethylsilane, our complexes exhibit comparable or better catalytic activity than other Rh(I) systems containing NHC ligands [59, 60].
Experimental investigation of the desulfurization of a high sulfur coal with multi-ring sulfurous
Published in International Journal of Coal Preparation and Utilization, 2023
Lanhui Huang, Ke Liu, Yumeng Chen, Zhendong Song
The multi-ring sulfurous is always surrounded by carbon, which reduces the desulfurization rate of the traditional chemical method (Liu et al. 2008). It is noted that TP is the typical multi-ring sulfurous structure. In an attempt to address the problem related to multi-ring sulfurous, a series of novel chemical desulfurization methods have been studied (Cai, Ge, and Zhang 2019; Mu et al. 2021; Singh, Kumar, and Mohapatra 2020; Tang et al. 2017; Usto et al. 2022; Wang et al. 2021; Yue et al. 2021). The chemical solvent including potassium alkoxide and hydrosilane has been considered a potential reduction desulfurizer. Since the C-S bond of multi-ring sulfurous could be broken with potassium tert-butoxide as the catalyst and triethylsilane as the reducing agent (Fedorov et al. 2013). The reduction desulfurization method could be defined as the KOSi system. Recently, Toutov et al. (Toutov et al. 2017) displayed that KOSi was effective in removing TP, seemingly irrespective of the steric bulk around the sulfur center and without unselective hydrogenation or rearrangement of aromatic rings. The method lowers the sulfur content of a spiked diesel with TP from 2000 ppm to 2 ppm. However, this method was rarely reported in coal desulfurization. Tang et al. (Tang et al. 2018, 2018, 2020) applied KOSi to coal desulfurization for the first time. It was shown that organic sulfur on coal could be reduced effectively in optimum conditions, the desulfurization rate was affected by the amount of reducing agent, treatment time and temperature, and the results of XPS showed the TP on the raw coal surface was significantly removed without destroying the carbon skeleton of coal. Thus, the KOSi is a promising chemical desulfurization method for the removal of multi-ring sulfurous, and this method should be applied in the desulfurization of coal.