Synthesis and characterization of PMoV/Fe 3 O 4 /g-C 3 N 4 from melamine: An industrial green nanocatalyst for deep oxidative desulfurization
作者:Ezzat Rafiee、Maryam Khodayari
DOI:10.1016/s1872-2067(16)62548-2
日期:2017.3
that of real oil were also studied under optimized conditions. In addition, the effects of various nitrogen compounds, as well as the use of one- and two-ring aromatic hydrocarbons as co-solvents, on the catalytic removal of sulfur from DBT were investigated. The catalyst was easily separated and could be recovered from the reaction mixture by using an external magnetic field. Additionally, the remaining
A new halide-free efficient reaction-controlled phase-transfer catalyst based on silicotungstate of [(C<sub>18</sub>H<sub>37</sub>)<sub>2</sub>(CH<sub>3</sub>)<sub>2</sub>N]<sub>3</sub>[SiO<sub>4</sub>H(WO<sub>5</sub>)<sub>3</sub>] for olefin epoxidation, oxidation of sulfides and alcohols with hydrogen peroxide
The oxidation of various alkenes (such as linear terminalolefins, internal olefins, cyclic olefins and unactivated alkenes) to epoxides, sulfides to sulfoxides and sulfones, alcohols to carbonyl compounds, are successfully catalyzed by this recyclable and environmentally benign catalyst using H2O2 as oxidant and ethyl acetate as solvent. This catalyst is not only capable of catalyzing homogeneous oxidation
开发了一种基于[[C 18 H 37)2(CH 3)2 N] 3 [SiO 4 H(WO 5)3 ]的硅钨酸盐的新型反应控制相转移催化剂。该催化剂是用硅作为杂原子,其是该组成为:季铵heteropolyoxotungstates的先前报道的反应控制的相转移催化剂不同的新的杂多化合物[π-C 5 H ^ 5 N(CH 2)15 CH 3 ] 3 [PW 4 O 16]和[π-C 5 H ^ 5 N(CH 2)15 CH 3 ] 3 [PW 4 ø 32 ]与磷作为杂原子。通过使用H 2 O 2,这种可回收利用且对环境无害的催化剂成功地将各种烯烃(例如直链末端烯烃,内烯烃,环状烯烃和未活化的烯烃)氧化成环氧化物,将硫化物氧化成亚砜和砜,将醇氧化成羰基化合物。作为氧化剂,乙酸乙酯作为溶剂。该催化剂不仅能够催化具有独特的反应控制相转移特性的有机底物的均相氧化,而且避免使用有毒溶剂。反应后催化剂易于
Aerobic photoxidation of sulfides using unique hybrid polyoxometalate under visible light
作者:Davud Karimian、Fatemeh Zangi
DOI:10.1016/j.catcom.2021.106283
日期:2021.4
decrement in the polyoxometalate band gap and turned this hybrid polyoxometalate to a photocatalytic compound, which can conduct catalytic reactions under visible light. In this line, we devised photoxidation of sulfides using this photocatalyst and under O2 atmosphere as a sustainable and environmental friendly oxidant. Various kinds of sulfides were investigated under optimum reaction conditions and
Catalytic activity of nickel(II), copper(II) and oxovanadium(II)-dihydroindolone complexes towards homogeneous oxidation reactions
作者:Mohamed Shaker S. Adam
DOI:10.1002/aoc.4234
日期:2018.4
molar ratios. A comparison in the catalytic potential of paramagnetic complexes of low and highvalent metal ion was explored in the oxidation processes of cis‐cyclooctene, benzyl alcohol and thiophene by an aqueous H2O2, as a green terminal oxidant, in the presence and absence of acetonitrile, as an organic solvent, at 85 °C. NiH2ID, CuH2ID and VOH2ID show good catalytic activity, i.e. good chemo‐ and
A manganese(<scp>iii</scp>) Schiff base complex immobilized on silica-coated magnetic nanoparticles showing enhanced electrochemical catalytic performance toward sulfide and alkene oxidation
In this study, a novel Mn(III)–Schiffbasecomplex was synthesized and characterized. The structure of this complex was determined to be a deformed octahedral coordination sphere by single-crystal X-ray diffraction analysis. The Mn(III)–Schiffbasecomplex was supported on silica-coated iron magnetic nanoparticles via axial coordination by one-step complex anchoring to produce a heterogenized nanocatalyst
本研究合成并表征了一种新型的 Mn( III )-Schiff 碱配合物。通过单晶X射线衍射分析确定该配合物的结构为变形的八面体配位球。Mn( III )-Schiff碱配合物负载在二氧化硅包覆的铁磁性纳米颗粒上通过一步复杂锚定的轴向配位产生异质纳米催化剂。之后,通过傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能量色散X射线光谱(EDX)、热重分析(TGA)、振动样品磁力测定法对复合物进行表征(VSM) 和粉末 X 射线衍射 (XRD)。此外,使用原子吸收光谱来确定负载金属的量。多相纳米催化剂有效地催化多种硫化物和烯烃与 H 2 O 2的氧化在玻璃碳电极存在下,向反应混合物施加电压。结果表明,与类似化学氧化反应的情况相比,对反应混合物施加电位可以显着缩短反应时间。此外,苯乙烯的电化学氧化获得了优异的周转频率值(17 750 h -1 )。此外,在甲基