scholarly journals Development of Pure Silica CHA Membranes for CO2 Separation

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 926
Author(s):  
Gabriel Gama da Silva Figueiredo ◽  
Daishi Takayama ◽  
Katsunori Ishii ◽  
Mikihiro Nomura ◽  
Takamasa Onoki ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Porous Alumina ◽  
Secondary Growth ◽  
Porous Silica ◽  
Alumina Substrate ◽  
Co2 Separation ◽  
Silica Substrate ◽  
Pure Silica ◽  
Growth Method

Thin pure-silica chabazite (Si-CHA) membranes have been synthesized by using a secondary growth method on a porous silica substrate. A CO2 permeance of 2.62 × 10−6 mol m−2 s−1 Pa−1 with a CO2/CH4 permeance ratio of 62 was obtained through a Si-CHA membrane crystallized for 8 h using a parent gel of H2O/SiO2 ratio of 4.6. The CO2 permeance through the Si-CHA membrane on a porous silica substrate was twice as high as that through the membrane synthesized on a porous alumina substrate, which displayed a similar zeolite layer thickness.

scholarly journals Preparation of Continuous Highly Hydrophobic Pure Silica ITQ-29 Zeolite Layers on Alumina Supports

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4150
Author(s):  
Miguel Palomino ◽  
Hideki Ono ◽  
Susana Valencia ◽  
Avelino Corma
Keyword(s):  
Porous Alumina ◽  
Secondary Growth ◽  
Synthesis Conditions ◽  
Pure Silica ◽  
Hydrophobic Membranes ◽  
Gel Preparation ◽  
Highly Hydrophobic ◽  
Subsequent Improvement ◽  
Selection Of ◽  
Alumina Supports

The preparation of continuous layers of highly hydrophobic pure silica ITQ-29 zeolite, potentially applicable as hydrophobic membranes for separation of molecules based on their polarity, has been investigated. Continuous layers of intergrown ITQ-29 zeolite crystals were successfully grown on porous alumina supports by optimization of the synthesis conditions, such as the appropriate selection of the seeds, the procedure for the gel preparation, and the calcination conditions. This resulted in the formation of all silica ITQ-29 zeolite layers without the presence of germanium required in previously reported ITQ-29 membranes, with the subsequent improvement in quality and stability, as verified by the absence of cracks after calcination. We have proved that the incorporation of aluminum from the support into the zeolite layer does not occur, neither during the secondary growth nor through migration of aluminum species during calcination.

Synthesis and Characterization of NaA Zeolite Membranes Prepared by the Secondary Growth Method: A Research-Based Comprehensive Experiment

Daxue Huaxue ◽  
2018 ◽  
Vol 33 (9) ◽  
pp. 69-74
Author(s):  
Liangqing LI ◽  
◽  
Qipeng SONG ◽  
Jinjian ZHANG ◽  
Chenchen DAI ◽  
...  
Keyword(s):  
Secondary Growth ◽  
Synthesis And Characterization ◽  
Zeolite Membranes ◽  
Naa Zeolite ◽  
Growth Method

scholarly journals Preparation and Progress in Application of Gold Nanorods

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Liqing Meng ◽  
Jinsheng Zhang ◽  
Huiqin Li ◽  
Weiwei Zhao ◽  
Tonggang Zhao
Keyword(s):  
Optical Properties ◽  
Gold Nanorods ◽  
Secondary Growth ◽  
Disease Diagnosis ◽  
Information Storage ◽  
Hard Template ◽  
Comprehensive Review ◽  
Growth Method ◽  
Seed Method ◽  
Hard Template Method

Gold nanorods (Au NRs) have attracted extensive research interest due to their unique optical properties, adjustable aspect ratio, and easy surface modification in the fields of biosensing, bioimaging, and disease diagnosis and detection. In this review, we present a comprehensive review of various methods for preparing gold nanorods including hard template method, electrochemistry method, photochemistry method, seed-mediated growth method, secondary growth method, and amorphous seed method. The unique optical properties of the gold nanorods and its applications in biomedical, detection, catalysis, and information storage will also be discussed in detail.

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).

Surface modification of porous alumina filters for CO2 separation using silane coupling agents

2016 ◽  
Vol 497 ◽  
pp. 216-220 ◽  
Author(s):  
Tsuyoshi Takahashi ◽  
Remi Tanimoto ◽  
Toshihiro Isobe ◽  
Sachiko Matsushita ◽  
Akira Nakajima
Keyword(s):  
Surface Modification ◽  
Porous Alumina ◽  
Coupling Agents ◽  
Co2 Separation ◽  
Silane Coupling Agents ◽  
Silane Coupling

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.

The influence of porous silica substrate on the properties of alumina films studied by X-ray reflection spectroscopy

2012 ◽  
Vol 38 (6) ◽  
pp. 562-564 ◽  
Author(s):  
A. S. Konashuk ◽  
A. A. Sokolov ◽  
V. E. Drozd ◽  
A. A. Romanov ◽  
E. O. Filatova
Keyword(s):  
Porous Silica ◽  
Reflection Spectroscopy ◽  
X Ray ◽  
Silica Substrate ◽  
Alumina Films
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