Aynaz Meshkat - Nanostructure Materials Research Center, Sahand University of Technology, Tabriz, Iran
Mohammad Javad Vaezi - Nanostructure Materials Research Center, Sahand University of Technology, Tabriz, Iran
Ali Akbar Babaluo - Nanostructure Materials Research Center, Sahand University of Technology, Tabriz, Iran

In this study, seeding of DD3R particles as an important step in the synthesis of DD3R membranewith secondary growth method was investigated. Dip-coating method is used for seeding of DD3R particleson the modified surface of α-alumina supports. 0.1, 0.2 and 0.3 wt% aqueous suspensions of the DD3Rseeds were prepared and each support was coated three times with dipping time of 240 s. Scanningelectron microscopy (SEM) analysis was used for the investigation of the quality of seed layer formed onthe support. It is shown that the uniform layer of seeds was formed with 0.2 wt% seed suspensionconcentration. DD3R zeolite membrane was synthesized via hydrothermal method on the support seededwith 0.2 wt% seed suspension concentration. The X-ray diffraction and SEM analysis confirmed thesynthesis of uniform DD3R zeolite membrane layer on the support which can be due to the uniformdistribution of the DD3R seeds. Single gas permeation tests of N2, CO2 and CH4 were carried out, so thatgood perm-selectivity for gas mixtures was observed.

Seeding, Seed Suspension Concentration, DD3R Zeolite Membrane