01750nas a2200205 4500008004100000022001400041245006200055210006100117260006900178300001200247490000800259520105600267653001501323653001001338653002801348653002601376100002201402700002201424856009801446 2012 eng d a1385-894700aIsophorone reactor: modelling and performance enhancement0 aIsophorone reactor modelling and performance enhancement aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcOCT a349-3670 v2073 a

The production of isophorone in a reactive distillation column was modelled. Mass transfer and heat transfer accompanied by chemical reactions were incorporated in a dynamic non-equilibrium multistage model. A base case simulation was identified and established. The base case simulation showed the value of key performance indicator that is mass ratio of acetone consumed to isophorone produced as 1.54. The computational model was then used to understand and to evaluate influence of various key design and operating parameters on this key performance indicator. Influence of reactor volume, mass transfer coefficient and feed composition, location and temperature was evaluated. The simulated results indicate that the key performance indicator can be improved (reduce acetone consumed per isophorone produced) by manipulating acetone content in the feed and location of the feed. The presented results will be useful for realising performance enhancement of isophorone and other similar reactors. (C) 2012 Elsevier B.V. All rights reserved.

10aIsophorone10aModel10aPerformance enhancement10aReactive distillation1 aDarda, Pranay, J.1 aRanade, Vivek, V. uhttps://library.ncl.res.in/content/isophorone-reactor-modelling-and-performance-enhancement-002884nas a2200301 4500008004100000022001400041245016300055210006900218260000800287300001800295490000800313520181300321653002402134653002002158653001402178653001702192653001202209653002902221653001902250653002802269653003602297653001502333100001602348700002902364700002702393700003002420856013202450 2017 eng d a1932-744700aWater mediated deactivation of Co3O4 naonrods catalyst for CO oxidation and resumption of activity at and above 373 K: electronic structural aspects by NAPPES0 aWater mediated deactivation of Co3O4 naonrods catalyst for CO ox cSEP a20296–203050 v1213 a

The catalytic activity of the Co3O4 nanorods (NRs) for the CO oxidation reaction and the effect of water on the catalytic reaction have been explored with near-ambient pressure photoelectron spectroscopy (NAPPES) and mass spectral analysis. Comparative NAPPES studies have been employed to understand the elucidation of the catalytic reaction pathway and the evolution of various surface species. The results confirm the suppression of the CO oxidation activity on the Co3O4 NRs in the presence of water vapor. Various type of surface species, such as CO(ads), hydroxyl, carbonate, formate, are found to be present on the catalyst surface depending on the reaction conditions. Vibrational features of CO, O-2, and CO, were observed and shift in binding energy of these features under the reaction conditions directly suggests a change in work function of the catalyst surface. Under dry conditions, CO couples with labile 0 atoms to form CO2; however, under wet conditions, CO predominantly interacts with surface OH groups resulting in the formation of carbonate and formate intermediates. In situ studies of oxidation of CO on Co3O4 shows that CO oxidation depends not only on surface Co3+ concentration but also influenced by Co-3/Co' ratio on the catalyst surface. The carbonate was found to be a reaction inhibitor at room temperature; however, it acts as an active intermediate at 375 K and above. Above the boiling point of water, Co3O4 NR surfaces begin to show the oxidation activity even in the presence of water vapor. The intrinsic role of intermediate species was used to derive a possible reaction mechanism under different reaction conditions.

10aAmbinent-temprature10acarbon monoxide10aGas Shift10aH Activation10aIn-situ10aLow-temprature oxidation10aMolecular-beam10aPerformance enhancement10aRay Photoelectron-Spectroscopyu10aThin-films1 aJain, Ruchi1 aReddy, Kasala, Prabhakar1 aGhosalya, Manoj, Kumar1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/water-mediated-deactivation-co3o4-naonrods-catalyst-co-oxidation-and-resumption-activity-and