scholarly journals Study the Effect of Seeding Suspension Concentration of DD3R Particles on the Modified Surface of Α-Alumina Support for Preparing DD3R Zeolite Membrane with High Quality

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Aynaz Meshkat ◽  
Mohammad Javad Vaezi ◽  
Ali Akbar Babaluo
Keyword(s):  
Secondary Growth ◽  
Dip Coating ◽  
Sem Analysis ◽  
Gas Permeation ◽  
Zeolite Membrane ◽  
Alumina Support ◽  
Suspension Concentration ◽  
Coating Method ◽  
Growth Method ◽  
Modified Surface

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

Preliminary Study on the Synthesis of ZIF-8 Membranes via In Situ and Secondary Seeded Growth Methods

2016 ◽  
Vol 1133 ◽  
pp. 649-653 ◽  
Author(s):  
Li Sze Lai ◽  
Yin Fong Yeong ◽  
Kok Keong Lau ◽  
Mohd Shariff Azmi
Keyword(s):  
Secondary Growth ◽  
Dip Coating ◽  
Gas Permeation ◽  
In Situ Growth ◽  
Seeded Growth ◽  
Nitrogen Gas ◽  
Growth Method ◽  
Stage Synthesis ◽  
Growth Methods

In this work, synthesis of ZIF-8 membranes via in situ and secondary seeded growth methods was conducted at the preliminary stage. Synthesis durations were varied at 4 h and 36 h using in situ growth method. For secondary growth, the seeding procedure was applied through rubbing and dip-coating of the seeds on the support. The resultant membranes were characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM). Subsequently, the defects of the resultant membranes were determined using nitrogen gas permeation test. The results showed that, ZIF-8 membrane synthesized using in situ growth method for 4 h exhibited highest crystallinity and lower defects with the nitrogen gas permeance of 5.09 × 10-7 mol/m2·s·Pa. Besides, in situ growth method has shown its potential in synthesizing high quality ZIF-8 membrane through an easy and faster route.

The Investigation of Preparing the Beta Zeolite Membrane by the Way of Secondary Growth

2012 ◽  
Vol 608-609 ◽  
pp. 1463-1466 ◽  
Author(s):  
Guo Lin Shao ◽  
Chun Ling Yu ◽  
Ying Huan Fu ◽  
Hong Yi Dai ◽  
Li Ping Zhang
Keyword(s):  
Secondary Growth ◽  
Dip Coating ◽  
Zeolite Membrane ◽  
Beta Zeolite ◽  
Self Assembling ◽  
Large Pore ◽  
Coating Method ◽  
Support Tube ◽  
Dip Coating Method ◽  
The Way

Beta zeolite membrane was prepared on the surface of α-Al2O3support tube with large pore by the way of secondary growth. Different seeding techniques, such as ultrasonic surge, self-assembling and dip-coating, were investigated, and the results indicated that the best one was dip-coating method for the support with large pore. The prepared membrane was characterized by SEM and XRD. It was proved that the beta zeolite membrane prepared by the way of secondary growth is continuous, dense and defect-free.

Separation of Methane from Shuttle Tanker Vents Gases by Adsorption on a Polyurethane/Zeolite Membrane

2017 ◽  
Vol 733 ◽  
pp. 42-46
Author(s):  
Habiba Shehu ◽  
Edidiong Okon ◽  
Edward Gobina
Keyword(s):  
Carbon Dioxide ◽  
Physical Properties ◽  
Crude Oil ◽  
Deep Water ◽  
Separation Factor ◽  
Gas Permeation ◽  
Zeolite Membrane ◽  
Alumina Support ◽  
Molar Flux

Shuttle tankers are becoming more widely used in deep water installations as a means of transporting crude oil to storage plants and refineries. The emissions of hydrocarbon vapours arise mainly during loading and offloading operations. Experiments have been carried out on the use of polyurethane/zeolite membrane on an alumina support for the separation of methane from carbon dioxide and oxygen. The physical properties of the membrane were investigated by FTIR. Single gas permeation tests with methane, propane, oxygen and carbon dioxide at a temperature of 293 K and pressure ranging from 0.1 to 1.0 x 10-5 Pa were carried out. The molar flux of the gases through the membrane was in the range of 3 x 10-2 to 1 x 10-1 molm-2s-1. The highest separation factor of CH4/CO2 and CH4/O2 and CH4/C3H8 was determined to be 1.7, 1.7 and 1.6 respectively.

Synthesis of MCM-22 Zeolite Membrane on a Porous Alumina Support

2014 ◽  
Vol 805 ◽  
pp. 272-278 ◽  
Author(s):  
Antonielly dos S. Barbosa ◽  
Antusia dos S. Barbosa ◽  
Meiry Glaucia F. Rodrigues
Keyword(s):  
Porous Alumina ◽  
Mercury Porosimetry ◽  
Secondary Growth ◽  
Molecular Size ◽  
Zeolite Membrane ◽  
X Ray Diffraction ◽  
Alumina Support ◽  
X Ray ◽  
Ceramic Support ◽  
Separation Of Mixtures

Much interest has been aroused in the application in industrial processes using zeolite membrane, due to its crystalline structure, and narrow pore diameters. These features enable the continuous separation of mixtures based on differences in molecular size and shape and also based on different adsorption properties. This paper reports the synthesis of MCM-22 zeolite membrane, using the method of secondary growth. The MCM-22 zeolite was synthesized by the hydrothermal method and characterized by spectroscopy Energy Dispersive X-ray (EDX), X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM).The ceramic support (α-alumina) was prepared using the technique of forming powder and then subjected to the sintering temperature of 1400 °C/1h and characterized by XRD. The zeolite membrane preparation was performed by the method of secondary growth and characterized by XRD, SEM and mercury porosimetry. The obtained zeolite membrane could be confirmed by X-ray diffraction. From, the obtained SEM pictures it was possible to observe the formation of a homogeneous film on the zeolite surface of the ceramic support (α-alumina).

scholarly journals Formation Process of Columnar Grown (101)-Oriented Silicalite-1 Membrane and Its Separation Property for Xylene Isomer

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 949
Author(s):  
Motomu Sakai ◽  
Takuya Kaneko ◽  
Yukichi Sasaki ◽  
Miyuki Sekigawa ◽  
Masahiko Matsukata
Keyword(s):  
Secondary Growth ◽  
Microscopic Analysis ◽  
Separation Performance ◽  
Membrane Thickness ◽  
Alumina Support ◽  
Separation Factors ◽  
Growth Method ◽  
Thin Part ◽  
Xylene Separation ◽  
Xylene Isomer

Silicalite-1 membrane was prepared on an outer surface of a tubular α-alumina support by a secondary growth method. Changes of defect amount and crystallinity during secondary growth were carefully observed. The defect-less well-crystallized silicalite-1 membrane was obtained after 7-days crystallization at 373 K. The silicalite-1 membrane became (h0l)-orientation with increasing membrane thickness, possibly because the orientation was attributable to “evolutionally selection”. The (h0l)-oriented silicalite-1 membrane showed high p-xylene separation performance for a xylene isomer mixture (o-/m-/p-xylene = 0.4/0.4/0.4 kPa). The p-xylene permeance through the membrane was 6.52 × 10−8 mol m−2 s−1 Pa−1 with separation factors αp/o, αp/m of more than 100 at 373 K. As a result of microscopic analysis, it was suggested that a very thin part in the vicinity of surface played as effective separation layer and could contribute to high permeation performance.

Preparation of Membrane Zeolite MCM-22 and Evaluation Process Oil/Water Separation

2015 ◽  
Vol 820 ◽  
pp. 605-608
Author(s):  
A. Santos Barbosa ◽  
A.S. Barbosa ◽  
M.G.F. Rodrigues
Keyword(s):  
Continuous Flow ◽  
Membrane Separation ◽  
Secondary Growth ◽  
Evaluation Process ◽  
Zeolite Membrane ◽  
Water Separation ◽  
Oil Emulsion ◽  
X Ray ◽  
Growth Method ◽  
Oil Water

The objective of this work was prepared by secondary growth method, and evaluate the ability of the MCM-22 zeolite membrane separation system in oil / water in a continuous flow system. The zeolite membrane MCM-22 was characterized by different techniques: X-Ray Spectrometry Energy Dispersive (EDX), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). A continuous flow was used. The test for measuring mass flow of water / oil emulsion was conducted in peristaltic pump, wherein the membrane zeolite MCM-22 was tested. Through the results, we can observe the efficiency of the method used in the preparation of zeolite membrane and was also observed that the zeolite MCM-22 membrane, obtained by secondary growth method showed removal percentages equivalent to the standards required by Resolution 392 CONAMA.

Y-Type Zeolite Membranes: Synthesis by Secondary by Method and Application in Treatment of Oily Effluents

2019 ◽  
Vol 958 ◽  
pp. 23-28
Author(s):  
Antonielly Santos Barbosa ◽  
Antusia Santos Barbosa ◽  
Meiry Gláucia Freire Rodrigues
Keyword(s):  
Zeolite Y ◽  
Dip Coating ◽  
Zeolite Membrane ◽  
Gamma Alumina ◽  
Zeolite Membranes ◽  
Water Emulsion ◽  
Ceramic Support ◽  
Coating Method ◽  
Dip Coating Method ◽  
Alpha Alumina

Several zeolite membrane types, including Mordenite (MOR), Linde Type A (LTA), and Faujasite (FAU), have been developed. Among these membranes, FAU zeolite membranes have a variety of applications, especially in the separation of mixtures that contain large molecules. The goal of this study is to use zeolite membranes (Y/alumina) to separate suspensions of oil-in-water emulsion. Two ceramic supports were prepared from the alumina at different sintering temperatures (700°C and 1200°C) to obtain gamma-alumina and alpha-alumina, respectively. The materials prepared, zeolite Y membranes/alpha-alumina and Y/gamma-alumina, were characterized using X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The powder pressing method was used to compact the alpha-alumina and gamma-alumina ceramic support and the dip-coating method was used to prepare the zeolite Y membranes. The XRD pattern showed that the zeolite Y membrane/alumina obtained by the secondary growth dip-coating method, independent of the ceramic support used, showed no trace of the phases characterized as impurities. It was possible to observe a significant reduction in the concentration of oil in the permeate for the zeolite Y membranes, thus showing their potential for use in this application.

Effect of Polymer Concentration on Matrimid 5218 based-Carbon Membrane for H2 Separation

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Mohd Syafiq Sharip ◽  
Norazlianie Sazali ◽  
Fatin Nurwahdah Ahmad
Keyword(s):  
Polymer Solution ◽  
Gas Separation ◽  
Polymer Concentration ◽  
Dip Coating ◽  
Gas Permeation ◽  
Carbon Membrane ◽  
Structural Morphology ◽  
Tubular Membrane ◽  
Carbon Membranes ◽  
Coating Method

Hydrogen (H2)-based economy development is expected to create extensive need for efficient collecting strategies of fairly high purity H2. The aim of a H2-selective membrane is to manipulate H2’s high diffusivity characteristics as well as to restrict the outcome of lower solubility. Carbon membranes offer high potential in gas separation industry due to its highly permeable and selective. Therefore, this study aims to investigate the effect of carbonization parameter, i.e., polymer concentration on the gas separation properties. Matrimid 5218 was used as a precursor for carbon tubular membrane preparation to produce high quality of carbon membrane via carbonization process. The polymer solution was coated on the surface of tubular ceramic tubes using dip-coating method. Matrimid 5218-based carbon tubular membranes were fabricated and characterized in terms of its structural morphology, chemical structure, thermal stability, and gas permeation properties by using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and pure gas permeation system, respectively. The polymer solution containing 15 wt% Matrimid 5218 shows the best formulation for the preparation of Matrimid 5218-based carbon tubular membrane. The highest H2/N2 selectivity of 401.08±2.56 was obtained for carbon membrane carbonized at 800oC with heating rate of 2oC/min.

scholarly journals Prevention in Thermal Crack Formation in Chabazite (CHA) Zeolite Membrane by Developing Thin Top Zeolite and Thick Intermediate Layers

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2113
Author(s):  
Min-Zy Kim ◽  
Syed Fakhar Alam ◽  
Devipriyanka Arepalli ◽  
Aafaq ur Rehman ◽  
Won-Youl Choi ◽  
...  
Keyword(s):  
Intermediate Layer ◽  
Secondary Growth ◽  
Particle Diameter ◽  
Zeolite Membrane ◽  
Average Particle ◽  
Alumina Support ◽  
Infiltration Process ◽  
Zeolite Membranes ◽  
Thermal Cracks ◽  
Intermediate Layers

Chabazite (CHA) zeolite membranes with an intermediate layer of various thicknesses were prepared using planetary-milled seeds with an average particle diameter of 300, 250, 200, 140, and 120 nm. The 120 nm seed sample also contained several smaller particles with a diameter of 20 nm. Such small seeds deeply penetrated into the pore channels of the α-alumina support during the vacuum-assisted infiltration process. During the secondary growth, the penetrated seeds formed a thick intermediate layer exiting between the zeolite layer and support. A decrease in seed size increased the penetration depth of seeds and the thickness of the intermediate layer, while the thickness of seed coating and zeolite layers was decreased. CHA zeolite membranes with a thin top zeoliate layer and a thick intermediate layer showed an excellent water/ethanol separation factor (>10,000) for 90 wt.% ethanol at 70 ℃ with a total flux of 1.5 kg m−2 h−1. There was no observation of thermal cracks/defects on the zeolite separation layer. The thick intermediate layer effectively suppressed the formation of thermal cracks during heating, since the tensile stress induced in the zeolite layer was well compensated by the compressive stress on the support. Therefore, it was successfully proven that controlling the microstructure of top surface and intermediate layers is an effective approach to improve the thermal stability of the CHA zeolite membrane.

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