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Träfflista för sökning "WFRF:(Bendiyasa I. Made) "

Sökning: WFRF:(Bendiyasa I. Made)

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1.
  • Perdana, Indra, 1973, et al. (författare)
  • Effect of external mass transport on permeation in a Wicke-Kallenbach cell
  • 2009
  • Ingår i: Chemical Engineering Research and Design. - : Elsevier BV. - 0263-8762 .- 1744-3563. ; 87:10, s. 1438-1447
  • Tidskriftsartikel (refereegranskat)abstract
    • Wicke-Kallenbach (WK) cells are often used for studying separation and component transport in porous material. In order to obtain important transport parameters, mathematical models are frequently developed but they generally consider the fluid phase in the WK compartments to be free of concentration gradients and thus external mass transport resistance is neglected. The present work is a detailed study of how the external transport influences permeation through porous material in a WK cell. External mass transfer effects were demonstrated experimentally and they were further studied from three-dimensional (3-D) model simulations. Film theory was applied to develop an appropriate Sherwood number correlation for the external mass transport coefficient. It was shown that the flow in the compartment and geometrical factors of the WK cell had significant influences on the permeation. It was found that introducing the proposed external mass transport correlation into a simplified one-dimensional (1-D) model was adequate to reproduce results from both the experimental data and the 3-D model.
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2.
  • Perdana, Indra, 1973, et al. (författare)
  • Modelling NOx adsorption in a thin NaZSM-5 film supported on a cordierite monolith
  • 2007
  • Ingår i: Chemical Engineering Science. - : Elsevier BV. - 0009-2509. ; 62:15, s. 3882-3893
  • Tidskriftsartikel (refereegranskat)abstract
    • Transient two dimensional (2-D) and three dimensional (3-D) single channel models (SCMs) describing transport of NOx into a NaZSM-5 film and kinetics for reactions forming nitrate species were developed. The film consisted of a continuous thin layer of inter-grown NaZSM-5 crystals supported on a cordierite monolith support. The 2-D model which included a comprehensive transport model was developed for studying the adsorption kinetics, whereas the more rigorous 3-D model was used to provide a better picture of radial and axial concentration and velocity variations in the monolith channel and the film. The overall adsorption-desorption mechanism, consisting of two competing reaction schemes for nitrate formation, was sufficient to predict the dynamic development of surface nitrate species. The simulation results showed that the adsorption is strongly influenced by transport resistance in the NaZSM-5 film. Also, the effective diffusion of NOx in the NaZSM-5 film is apparently surface nitrate concentration dependent.
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4.
  • Wirawan, Sang, 1973, et al. (författare)
  • CO 2 selective water gas shift membrane reactor: Modeling and simulation
  • 2012
  • Ingår i: ASEAN Journal of Chemical Engineering. - : Universitas Gadjah Mada. - 1655-4418 .- 2655-5409. ; 12:1, s. 59-72
  • Tidskriftsartikel (refereegranskat)abstract
    • The concept of a CO 2 selective water gas shift (WGS) membrane reactor has been modeled and simulated by a one-dimensional reactor and transport process in the membrane. The model was used to investigate the effect of temperature, total pressure, membrane thickness and area on the reactor performance. A Silicalite-1 membrane was considered to be integrated with the WGS reactor. The mass transport through the membrane was described by surface diffusion. Air was used as sweep gas on the permeate side of the membrane. The catalytic WGS kinetics were for a commercial Cu/ZnO catalyst for the lower-temperature WGS reaction. The WGS membrane reactor was sized to produce H 2 sufficient for the production of 10 kW electrical power from a fuel cell. The modeling and simulation results showed that the WGS membrane reactor with a silicalite-1 membrane was capable of decreasing the CO concentration to about 675 ppm which is 70% less than that achievable at equilibrium conversion, but it would come at the cost of unacceptable H 2 loss. Based on a minimum target of H 2 loss, the optimum outlet CO concentration achieved by the silicalite-1 membrane reactor was about 1310 ppm, under a range of limited conditions. The modeling study showed that both the WGS reaction rate and the CO 2/H 2 selective permeation played an important role on the overall reactor performance.
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5.
  • Wirawan, Sang, 1973, et al. (författare)
  • H2/CO2 permeation through a silicalite-1 composite membrane
  • 2011
  • Ingår i: Journal of Membrane Science. - : Elsevier BV. - 1873-3123 .- 0376-7388. ; 375, s. 313-322
  • Tidskriftsartikel (refereegranskat)abstract
    • Single and binary H2/CO2 gas permeation was studied through a silicalite-1 composite membrane consisting of a thin zeolite film (
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  • Resultat 1-5 av 5

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