Kinetics of heterogeneous decomposition of hydrogen peroxide with some transition metal complexes supported on silica-alumina in aqueous medium
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Use of semibatch reactor technology for the investigation of reaction mechanism and kinetics: Heterogeneously catalyzed epoxidation of fatty acid esters
2021, Chemical Engineering ScienceCitation Excerpt :Fig. 2 demonstrates clearly that operation under semibatch conditions significantly improves the reactant conversion and the product yield in the epoxidation reaction: an improvement of more than 30% was observed when low-flow semibatch conditions were applied compared to batch operation under identical conditions. It has been proposed by some researchers (Mandelli, 2001; Parada Hernandez et al., 2017; Pérez-Sena et al., 2020; Turco et al., 2016; Salem et al., 1993) that the peroxide sites formed on the catalyst surface due to the adsorption of hydrogen peroxide are either utilized to epoxidize the double bond or released in the form of molecular oxygen, i.e., catalyzed hydrogen peroxide decomposition. It is assumed that the overall hydrogen peroxide decomposition (non-catalyzed and catalyzed) taking place in parallel with the epoxidation of the double bond (Fig. 3) has a more rapid rate than the epoxidation process.
Tuning of the reaction parameters to optimize allylic oxidation of cyclohexene catalyzed by zeolite-Y entrapped transition metal complexes
2016, Journal of Molecular Catalysis A: ChemicalCitation Excerpt :However, the homogeneous metal complexes are more active and selective; the catalyst separation from the homogeneous liquid medium is usually troublesome. To tackle this problem, nowadays numerous heterogenization methods of homogeneous catalytic systems are being used to facilitate easy separation of the catalyst and the product(s) such as polymer anchoring [17], polymerization of homogeneous catalyst itself [18], entrapment of metal complex on a solid support like alumina, silica, or zeolites [19–21], and covalently anchoring to multi-wall carbon nanotubes (MWNTs) [22]. The entrapment of transition metal complex into zeolite-Y is found to be more suitable and ideal because the complex, once formed inside the nanopores of the zeolite-Y, is too large to diffuse out and is not lost into the liquid phase during the reaction.
Synthesis and characterization of Cu(II), Co(II) and Ni(II) complexes of a number of sulfadrug azodyes and their application for wastewater treatment
2014, Spectrochimica Acta - Part A: Molecular and Biomolecular SpectroscopyCitation Excerpt :ii) The increase in the ligand length increases the cavity size which in turn increases the catalytic activity. ( iii) The more stable the complex, the greater its catalytic activity, the greater its affinity to react with H2O2 and the greater the value of k [38]. From DTA analysis the highest (may be replaced by the first) decomposition temperatures for the organic ligands, after the removal of lattice and coordinated water molecules, have values: 319, 286, and 220 °C, for the ligands CuL2, CuL1 and CuL3, respectively, i. e. L2 is the more stable one so its complex has greater catalytic activity and CuL3 complex has lower catalytic activity.
Cu-containing MFI zeolites as catalysts for wet peroxide oxidation of formic acid as model organic contaminant
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A comparison of Al-Fe and Zr-Fe pillared clays for catalytic wet peroxide oxidation
2006, Chemical Engineering JournalA preliminary study on iron species as heterogeneous catalysts for the degradation of linear alkylbenzene sulphonic acids by H<inf>2</inf>O<inf>2</inf>
2002, Applied Catalysis B: Environmental