<span style="font-size:13.0pt;mso-bidi-font-size: 10.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-GB">Synthesis of Ti–β zeolite membrane over porous α–alumina tubular support</span>

Abstract

<span style="mso-bidi-font-size:9.0pt;letter-spacing: -.1pt" lang="EN-GB">Three-dimensional large-pore titanosilicate analogue of zeolite Beta membrane has been synthesized for the first time through hydrothermal method over porous α-alumina tubular support. Crack-free continuous intergrown membranes are obtained after four repeated syntheses over the same alumina support but with different synthesis gels. The thickness of the calcined Ti–β membrane is found to be ≈9 ± 2 μm. The calcined composite membranes have been characterized by powder X-ray diffraction (XRD), scanning electron microscopy, energy dispersive X-ray analysis, UV-visible diffuse reflectance spectroscopy and elemental analysis by inductively coupled plasma studies. The XRD patterns of composite membrane and powder sample collected from the reactor suggest the formation of pure crystalline titanium Beta phase. The UV-visible spectrum confirms the presence of titanium predominantly in the tetrahedral position. The gas permeability of the membranes at room temperature at different inlet pressure is of the order of 10^–8. Prior to calcination, the composite membranes do not show any gas permeability indicating high compactness of the synthesized membrane.

</span>