01562nas a2200217   4500008004100000245006300041210006100104260000800165300001200173490000800185520089100193653002601084653002701110653001901137653002201156653002901178653001701207100001501224700001301239856009201252       2018                        eng d00aModelling of water-to-gas hollow fiber membrane humidifier0 aModelling of watertogas hollow fiber membrane humidifier  cDEC  a955-9710 v1923 a<p>A microscopic mathematical model is developed for membrane based water-to-gas humidification by rigorously accounting for phase equilibrium between the membrane and water phases as well as membrane and gas phases in addition to the coupled heat and mass transfer occurring across the membrane. The model is then integrated along the length of a hollow fiber membrane humidifier in order to predict humidifier performance as a function of design variables, operating variables and operational strategies. For realistic values of membrane thickness and flow parameters, the model suggests that while membrane-gas interfacial resistance alone is crucial for heat transfer, the vapor transfer is governed by the combined resistances of diffusion within the membrane and membrane-gas interface. The model is validated against experimental data obtained using a commercial hollow fiber</p>10aCoupled Heat and Mass10aFuel Cell Applications10aHumidification10aPhase equilibrium10aProton exchange membrane10aWater-to-gas1 aPandey, R.1 aLele, A.  uhttps://library.ncl.res.in/content/modelling-water-gas-hollow-fiber-membrane-humidifier02331nas a2200253   4500008004100000022001400041245014000055210006900195260000800264300001000272490000700282520143000289653001401719653001701733653002501750653001301775653002701788653001301815653003701828100002201865700002401887700003601911856013001947       2023                        eng d  a1615-684600aLow-temperature preferential CO oxidation in a hydrogen-rich stream over Pt-NaY and modified Pt-NaY catalysts for fuel cell application0 aLowtemperature preferential CO oxidation in a hydrogenrich strea  cFEB  a15-280 v233 a<p>
	Preferential oxidation of CO (CO-PROX) in the hydrogen-rich stream has been carried out over Pt-NaY catalysts containing various Pt loadings along with Fe, Co, and Au. Catalysts have been characterized with inductively coupled plasma-atomic emission spectroscopy, Brunauer, Emmett, and Teller surface area, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature programmed reduction, and Pt dispersion. CO-PROX activities and CO oxidation selectivities are observed to increase with an increase in Pt content. Pt-NaY catalyst with 0.75 wt.% Pt loading shows maximum CO-PROX activity at low temperatures. An increase in space velocity decreases the CO and O-2 conversions, but CO oxidation selectivity increases. A decrease in activity is observed when reformat gas contains around 20% H2O. During the stability test, no change in CO and O-2 conversions is observed, but a small increase in the CO oxidation selectivity is noticed after 10 h indicating that the Pt-NaY catalyst is a promising candidate for CO-PROX reaction in a hydrogen-rich stream. The Pt-Fe-NaY catalyst shows better activity than the Pt-NaY catalyst but starts deactivating after 10 h. However, activity is observed to decrease over Pt-Co-NaY and Pt-Au-NaY catalysts. Pt-Fe-NaY catalyst with 0.75 and 0.35 wt.% Pt and Fe, respectively, shows better CO-PROX activity at a temperature of 75 degrees C.</p>
10acatalysis10aCO oxidation10aexperimental results10aflow bed10aFuel Cell Applications10aHydrogen10aX-ray photoelectron spectroscopy1 aMalwadkar, Sachin1 aBera, Parthasarathi1 aSatyanarayana, Chilukuri, V. V.  uhttps://library.ncl.res.in/content/low-temperature-preferential-co-oxidation-hydrogen-rich-stream-over-pt-nay-and-modified-pt