Cermet membranes

Dorris, S.E., T.H. Lee, S. Wang, J.J. Picciolo, J.T. Dusek, and U. Balachandran, Dense Cermet Membranes for Hydrogen Separation, 19th Annual International Pittsburgh Coal Conference, Pittsburgh,... 

Both cold and hot inert gas pressure tests were performed on samples of brazed cermet membranes in advance of hydrogen flux measurements in order to ascertain the integrity of the Inconel 600-to-cermet seal under high temperature and pressure conditions. The procedure used in these tests has been described elsewhere [Rothenberger etal., 1999]. 

Hydrogen flux testing of the ANL-1 cermet membranes was conducted on the HMT unit. Data from these runs is plotted in Figure 2. 

Preparation of BC Y powders for ANL-1 and -2 membranes is described in detail elsewhere. BCY and metal powders were mixed together to prepare powders for ANL-la and -2a membranes. Powders for ANL-3 membranes were prepared by mixing one of two hydrogen transport metals with ceramic powders that are reported to be poor proton conductors. All membranes contained 40 vol% metal, except where otherwise noted. The powder mixtures were pressed uniaxially to prepare disks ( 22 mm in diameter and 2 mm thick) for sintering. Cermet membranes were sintered in either air or 4% H2/balance He, N2, or Ar in the temperature range of 1,350 to 1,420°C. 

FABRICATION AND CHARACTERIZATION OF CERMET MEMBRANE FOR HYDROGEN SEPARATION... 

Fabrication and Characterization of Cermet Membrane for Hydrogen Separation... 

After fabrication, the density of membrane was measured by dimension calculation. The crystalline phases of cermet membrane were investigated by using X-ray diffraction (XRD model JEOL, JDX-3530). Scanning electron microscope (SEM JEOL, JSM-6301F) was used to investigate the microstructure of Ni/AbOj membrane. For analysis of nickel dispersion of Ni/AbOj membrane, energy dispersive X-ray spectroscope (EDS Oxford Inca 300 and 350) with X-ray dot mapping was used. In addition, the pore size and porosity were determined by mercury porosimetry. 

Fig. 9.10 (a) Concept for closed-one-ended ceramic tubes bundled for cermet membrane applications, (b) Bundle of ceramic membrane tubes produced by CoorsTek for an earUer industried separation application (Courtesy R. Kleiner, J. Stephan, and F. Anderson, CoorsTek)... 

Balachandran et al. (2007) also showed several ways to increase the H2 production rate by H2O decomposition via MIEC membranes. Producing CGO/Ni membranes with a finer microstructure enlarged the triple-phase-boundary area and increased the H2 production rate to = 10 cm (STP)/min.cm. Using a single-phase, mixed-con-ducting membrane (SrFeCoo.50x(SFC2)) also produced higher H2 production rates relative to dual-phase cermet membranes. 

Figure 39.11 H2 permeation flux within Ni- thickness = 0.4 mm (b) Ni-BaZro.8-xCexYo.2O3 based cermet membranes as a function of (0.4 < x < 0.8, Ni-BZCY), thickness = 1.0 mm. time in the presence of CO2 in the feed (Images adapted from Refs [197,200],...

Meng, X., Song, J., Yang, N. et al. (2012) Ni-BaCeoo sTbo.osOs.j cermet membranes for hydrogen permeation.of Membrane Science, 401/402, 300-305. 

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