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MOR zeolite crystal structure drawn by VESTA. Analysis was conducted by the TOSO analysis and Reserch Center Co. Ltd.. (a)Na-MOR, (b) Co-MOR, (c) Cu-MOR.
Source publication
C-axis-oriented mordenite (MOR) zeolite membranes were fabricated and evaluated for nitrogen permeance. MOR crystals having Na⁺ as a counter-ion exhibit b-axis-orientation parallel to a magnetic field, but c-axis-orientation was achieved by exchanging the counter-ion with transition metal or rare earth ions. The oriented seed layers were prepared b...
Contexts in source publication
Context 1
... MOR zeolite crystal structures was illustrated based on the Rietveld analysis findings using VESTA drawing software (Fig. 5) [20]. Table 2 gives the lattice parameters L and quality parameters R of Rietveld analysis of the Na + , Co 2+ , Ni 2+ , Cu 2+ , and Fe counter-ion MOR zeolite samples. R wp is the weighted profile R-factor and R exp is the expected R-factor, which is the possible minimum value for R wp . S is the goodness-of-fit indicator, which can ...
Context 2
... that the caxis and a-axis directions were highly susceptible, whereas the susceptibility in the b-axis direction was low [15]. Changes in the orientation of the ion-exchanged MOR zeolites indicated that crystal magnetic anisotropy was affected by the ion exchange, which involved the Na + ions on the walls of the large pores parallel to the c-axis (Fig. 5). Co 2+ and Cu 2+ each have an odd number of d electrons (Co 2+ : 7, Cu 2+ : 9), and materials containing ions with unpaired electrons are expected to be paramagnetic. Oxygen ions derived from water molecules were redistributed around the ion-exchanged cations, while oxygen ions within the crystal were rearranged slightly. The Co 2+ ...
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Citations
Controlling the crystallographic orientation in bulk ceramics is expected to improve their properties that depend on the axis of the crystal structure. The development of crystallographic orientation using a magnetic field has been reported in various types of bulk ceramics with anisotropic crystal structures. In this study, c‐axis–oriented AlN bulk ceramics were prepared by slip casting in a rotating high magnetic field. The c‐axes of 61% of the grains were aligned within 20°. Due to this orientation, the thermal conductivity of AlN was improved. A thermal conductivity difference of approximately 14% at room temperature was observed for the samples with different orientation axes, which is higher than its intrinsic anisotropy.
Photocatalysts based on silver or gold metallic and CdS semiconductor nanoparticles embedded on a mordenite matrix (M-CdS/MOR), was successfully synthesized and tested to obtain glucuronic acid by photoconversion of glucose. The M-CdS/MOR photocatalyst exhibited a synergistic interaction between the plasmonic behavior from metallic nanoparticles and the photoactive properties of semiconductor nanoparticles, which leads to the photoconversion of the glucose (38% in 60 min). The reaction mechanisms are presented and discussed.
