01853nas a2200277   4500008004100000022001400041245012800055210006900183260000800252300001400260490000800274520094000282653000601222653001301228653001601241653001101257653000901268653001901277653003001296100002901326700002101355700001901376700002201395700002601417856013201443       2021                        eng d  a1011-372X00aUtilizing the oxygen carrier property of cerium iron oxide for the low-temperature synthesis of 1,3-butadiene from 1-butene0 aUtilizing the oxygen carrier property of cerium iron oxide for t  cOCT  a3057-30660 v1513 a<p>Low-temperature oxidative dehydrogenation (ODH) of 1-butene to 1,3-butadiene is one of the challenging reactions in the polymer industry. Towards this a highly dispersed cerium iron oxide was synthesized by citrate gel combustion method and employed for the synthesis of 1,3-butadiene (BD) from 1-butene. The reaction was carried out at low temperature under an oxygen-free atmosphere in a continuous flow mode fixed bed reactor. A decrease in the lattice parameters observed from PXRD and high-resolution TEM analysis proved that iron occupies cerium sites in the crystal lattice. XPS, TPR, and oxygen uptake studies quantified the nature and abundance of different oxygen species. ODH was observed through consuming lattice oxygens. The vacancies generated could be filled by re-oxidation with an external supply of oxygen which will restore the catalytic activity demonstrating the Mars van Krevelen mechanism. [GRAPHICS] .</p>
10a110a1-butene10a3-butadiene10aCerium10airon10aLattice oxygen10aoxidative dehydrogenation1 aVenugopalan, Aswathy, T.1 aKandasamy, Prabu1 aGogoi, Pranjal1 aRatneshkumar, Jha1 aThirumalaiswamy, Raja  uhttps://library.ncl.res.in/content/utilizing-oxygen-carrier-property-cerium-iron-oxide-low-temperature-synthesis-13-butadiene-103096nas a2200301   4500008004100000245011200041210006900153260000800222300000800230490000700238520212000245653001102365653001402376653001802390653001402408653001502422653001402437653001702451653002602468100002302494700002102517700002402538700002602562700002902588700002102617700002602638856013002664       2022                        eng d00aSynthesis and crystal structures of Mn(II) and Co(II) complexes as catalysts for oxidation of cyclohexanone0 aSynthesis and crystal structures of MnII and CoII complexes as c  cJUL  a1000 v103 a<p>
	The global demand on adipic usage in the production of plasticizers and synthetic polyamide is increasing. In line with the search for an efficient and energy-conserving way to isolate adipic acid (AA) in good yields, this paper introduces the oxidization of cyclohexanone utilizing two new coordination compounds, [Mn(2,6-pydc)(2)](imi) (1) and [Co(H(2)pza)(2)(H2O)(2)(NO3)].NO3 (2), as catalysts. Compounds 1 and 2 were synthesized by room temperature and refluxing methods, and characterized by spectral analyses (IR and UV-Vis.), SEM, BET, TGA, elemental, and X-ray crystallography. The single crystal structure of compound 1 revealed that pyridinedicarboxylate (2,6-pydc) and imidazole (imi) moieties were coordinated to the Mn(II) atom through imine nitrogen and deprotonated oxygen atoms, to form an undistorted octahedral coordination geometry with the N2O4 donor set. The axial and equatorial planes containing O2, O4, O5, and O7 atoms were from two adjacent 2,6-pydc ligands which formed the unidendate donor ligand; imi, on the other hand, acted as a bidendate donor ligand. For compound 2, the Co(II) atom was being coordinated by two pyrazinamide (H(2)pza) moieties, which acted as an unidendate donor ligand; two water molecules occupying the axial position, and one nitrate molecule occupying the apical position, were within the coordination sphere; a nitrate molecule was disordered outside the coordination sphere. The distance, 4.658 angstrom, between the Co1 atom and the N8 atom of the uncoordinated nitrate molecule, was within the range reported elsewhere. Cyclohexanone peroxidation experiments revealed that compound 1 exhibited unique catalytic performance by giving a 72.8% yield in adipic acid, in comparison to the 71.3% yield obtained with compound 2. The yields in AA were maintained by way of recyclability evaluation. The reaction kinetics of compound 2 gave less activation energy, E-a 2938 J mol(-1), while the thermodynamic parameters indicated that the chemical reactivity of cyclohexanone on the active surfaces of compounds 1 and 2 was via monolayer physisorption.</p>
10acobalt10aComplexes10acyclohexanone10aImidazole10amanaganese10aOxidation10apyrazinamide10apyridinedicarboxylate1 aTella, Adedibu, C.1 aIsaac, Aaron, Y.1 aClayton, Hadley, S.1 aOgunlaja, Adeniyi, S.1 aVenugopalan, Aswathy, T.1 aPrabu, Marimuthu1 aThirumalaiswamy, Raja  uhttps://library.ncl.res.in/content/synthesis-and-crystal-structures-mnii-and-coii-complexes-catalysts-oxidation-cyclohexanone