Pore modification of deca-dodecasil-rhombohedral zeolite membrane by carbon loading from in situ decomposition of 1-adamantanamine for improved gas separation

Abstract

A simple method of pore modification coupled with the removal of surface defects of Deca-Dodecasil-Rhombohedral (DDR) zeolite membrane was developed by Carbon (C) deposition. The carbon deposition was achieved by the controlled decomposition of the structure directing agent (SDA), 1-Adamantanamine (1-ADA), into the membrane pore surface. The membranes synthesized with and without pore modification were characterized by Thermal analysis, X-ray diffraction analysis, Infra Red spectroscopy, Transmission electron microscopy, Raman spectroscopy etc. Finally, performances of the membranes were evaluated by permeance studies.The non wetting characteristics of C had imparted the hydrophobicity of the membrane pores leading to enhanced permeability of the gas mixture. The modified membranes had shown to offer relatively high hydrogen permeance of 13.47 × 10 -7 mol.m -2 .s -1 .Pa -1 . The selectivity of H 2 / CO 2 was 4.9 based on single gas permeation and the separation factor was increased up to 8.5 for gas mixture (H 2 -CO 2 ) at room temperature. In the light of these findings, the current technique is proposed to be useful for making a defect free C loaded membrane in a single step with a high separation selectivity and permeability in tandem. This is the novelty achieved.

Aluminosilicate Nanocomposites from Incinerated Chinese Holy Joss Fly Ash: A Potential Nanocarrier for Drug Cargos

“…The observed diffraction angles were in good agreement with previous reports, thereby confirming the crystalline state of the aluminosilicates. As reported earlier, three notable diffraction peaks in the range of 15 to 35 degrees indicated the face-centered spherical crystalline index of the aluminoslicate 35,36 . However, the diffraction lines of (100) and indicated lattice fringes that correspond to the planes of a cubic structure 37 .…”