Written in English
|Statement||by Mohammed H. Hassan.|
|The Physical Object|
|Pagination||135 leaves, bound. :|
|Number of Pages||135|
The objective of this study is the investigation of the gas transport mechanism(s) through the microporous silica hollow fiber membrane. Transport Mechanisms in Microporous Membrane. Transport of gases through microporous materials consists of four different mechanisms as shown in Figure 1 . These mechanisms are Knudsen diffusion, capillary. Investigation and simulation of the transport of gas containing mercury in microporous silica membranes on the transport of N2 gas across cobalt oxide silica (CoOxSi) membranes. Experimental results suggest that Hg significantly affects N2 permeation at and °C, though this effect is negligible at °C. Investigation and Author: Guozhao Ji, Guozhao Ji, Anthe George, Anthe George, Vicky Skoulou, Vicky Skoulou, Graham Reed, Marco. An experimental and simulation investigation of gas transport in a microporous silica membran. By. Download PDF (29 MB) Abstract. Graduation date: Single Component and Mixed Gas Transport in a Silica Hollow Fiber Membrane". This unique transport is usually observed in ultra-microporous membranes with pore sizes below 5 Å, as it is the case for silica derived membrane for separating H 2 or He from other larger gases.
Request PDF | Investigation and Simulation of the Transport of Gas Containing Mercury in Microporous Silica Membranes | This work investigates the effect of condensable Hg vapour on the transport. An extensive model is given to analyse these the experimental conditions studied, the analysis of the gas transport mechanism shows that interface processes are not rate determining. The calculated activation energies for micropore diffusion are 21 . Simulation of gas transport in a 'network of micropores'. The effect of pore structure on transport properties (E.S. Kikkinides et al.). Recent Advances in Microporous Membrane Preparation. Microporous carbon membranes (S. Morooka et al.). Microporous silica membranes (N. Benes et al.). Zeolite membranes (J.D.F. Ramsay, S. Kallus). From Table reporting the main separative processes using ceramic membranes, it appears that the microporous membranes are convenient for nanofiltration, pervaporation, and gas separation applications. In the case of gas separation, the highest selectivity values are reached with microporous membranes ().The molar permeance π of a gas going through the membrane is the .
The effects of fabrication temperature on small gas (He, H 2, Ne, NH 3, CO 2, N 2, and CH 4) permeation properties through silica membranes were evaluated quantitatively using modified gas translation (GT) model. A silica membrane fired at °C showed He and H 2 permeances of × 10 –7 and × 10 –7 mol m –2 s –1 Pa –1 with. The presence of nano‐sized defects had an important influence on the gas permeation performance of microporous membranes, depending largely on the original pore size of the membrane in question. Moreover, the gas‐separation effect of the pore‐size distribution in a silica membrane was theoretically studied and revealed a significant. Microporous silica membranes have silica polymer network voids smaller than 3 Å where only small gas molecules such as helium ( Å) and hydrogen ( Å) can be transported. These silica membranes are highly expected to be available for H2 separation. In order to examine gas permeation mechanisms in the silica polymer network voids, factors such as membrane porous structures, gas. Preparation of Microporous Silica Membranes for Gas Separation Korean J. Chem. Eng.(Vol. 18, No. 1) branes formed by CVD using TEOS were not capable of permeat-ing molecules larger than CO2. Sol-gel method is frequently adopted in membrane synthesis or membrane pore modification because of its controllability and ho-.