scholarly journals Effects of Seed Crystals on the Growth and Catalytic Performance of TS-1 Zeolite Membranes

Membranes ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 41
Author(s):  
Wenjuan Ding ◽  
Sitong Xiang ◽  
Fei Ye ◽  
Tian Gui ◽  
Yuqin Li ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
High Performance ◽  
Catalytic Performance ◽  
Zeolite Membrane ◽  
Medium Size ◽  
Zeolite Membranes ◽  
Seed Crystals ◽  
Ratio Size ◽  
Porous Mullite ◽  
Size And Morphology

Dense and good catalytic performance TS-1 zeolite membranes were rapidly prepared on porous mullite support by secondary hydrothermal synthesis. The properties of seed crystals were very important for the preparation of high-catalytic performance TS-1 zeolite membranes. Influences of seed crystals (Ti/Si ratios, size, morphology, and zeolites concentration of the seed suspension) on the growth and catalytic property of TS-1 zeolite membranes were investigated in details. High Ti/Si ratio, medium-size, and morphology of the seed crystals were critical for preparing the high-performance TS-1 zeolite membrane. Compared with the bi-layer TS-1 zeolite membrane (inner and outer of the mullite tube), the mono-layer TS-1 zeolite membrane had a better catalytic performance for Isopropanol IPA oxidation with H2O2. When the Ti/Si ratio, size, and morphology of the TS-1 zeolites were 0.030, 300 nm, ellipsoid, and the zeolites concentration of the seed suspension was 5%, the IPA conversion, and flux through the TS-1 zeolite membrane were 98.23% and 2.58 kg·m−2·h−1, respectively.

scholarly journals Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

Membranes ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 43 ◽  
Author(s):  
Li Liang ◽  
Meihua Zhu ◽  
Le Chen ◽  
Caijun Zhong ◽  
Yiming Yang ◽  
...  
Keyword(s):  
Fluorescence Spectroscopy ◽  
Zeolite Membrane ◽  
Crystallization Time ◽  
Zeolite Membranes ◽  
X Ray ◽  
Synthesis Conditions ◽  
Precursor Synthesis ◽  
Porous Mullite ◽  
High Silica ◽  
The Ideal

Continuous and high silica SSZ-13 zeolite membranes were prepared on porous mullite supports from high SiO2/Al2O3 ratio or aluminum-free precursor synthesis gel. Single gas permeance (CO2 and CH4) of the high silica SSZ-13 zeolite membrane was decreased with the SiO2/Al2O3 ratio in the precursor synthesis gel, while the ideal CO2/CH4 selectivity of the membrane was gradually increased. Moreover, effects of synthesis conditions (such as H2O/SiO2 and RNOH/SiO2 ratios of precursor synthesis gel, crystallization time) on the single gas permeance performance of high silica SSZ-13 zeolite membranes were studied in detail. Medium H2O/SiO2 and RNOH/SiO2 ratios in the initial synthesis gel were crucial to prepare the good CO2 perm-selective SSZ-13 zeolite membrane. When the molar composition of precursor synthesis gel, crystallization temperature and time were 1.0 SiO2: 0.1 Na2O: 0.1 TMAdaOH: 80 H2O, 160 °C and 48 h, CO2 permeance and ideal CO2/CH4 selectivity of the SSZ-13 zeolite membrane were 0.98 × 10−7 mol/(m2·s·Pa) and 47 at 25 °C and 0.4 MPa. In addition, the SiO2/Al2O3 ratio of the corresponding SSZ-13 zeolite was 410 by X-ray fluorescence spectroscopy.

Facile synthesis of seed crystals and gelless growth of pure silica DDR zeolite membrane on low cost silica support for high performance in CO2 separation

2021 ◽  
Vol 624 ◽  
pp. 119110
Author(s):  
Nha Minh Nguyen ◽  
Quang Thanh Le ◽  
Duy Phuc-Hoang Nguyen ◽  
Tung Ngoc Nguyen ◽  
Thanh Tu Le ◽  
...  
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Zeolite Membrane ◽  
Co2 Separation ◽  
Silica Support ◽  
Facile Synthesis ◽  
Seed Crystals ◽  
Pure Silica

Preparation of ZSM-5 Zeolite Membranes by Combined Hydrothermal Synthesis and Electrophoretic Deposition

2015 ◽  
Vol 654 ◽  
pp. 47-52 ◽  
Author(s):  
Hideyuki Negishi ◽  
Stephanie Reuß ◽  
Wilhelm Schwieger ◽  
Aldo Roberto Boccaccini
Keyword(s):  
Hydrothermal Synthesis ◽  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Secondary Growth ◽  
Zeolite Membrane ◽  
Zeolite Membranes ◽  
Porous Stainless Steel ◽  
Seeding Method ◽  
Micron Size

The preparation of a ZSM-5 zeolite membrane on porous stainless steel disk by hydrothermal synthesis with electrophoretic deposition (EPD) as a seeding method was investigated. Micron size ZSM-5 crystal powder was seeded by EPD on the support disk by using ZSM-5 powder dispersed in ethanol. The seeded amounts were easily controlled by the deposition time during EPD. The membrane after secondary growth had a low amount of zeolite in comparison with the in situ seeding method and the permeance of single gas such as He, N2 and CO2 was also low in comparison with that of the in situ seeding method.

scholarly journals Computational Molecular Modeling of Transport Processes in Nanoporous Membranes

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 124 ◽  
Author(s):  
Kevin Hinkle ◽  
Xiaoyu Wang ◽  
Xuehong Gu ◽  
Cynthia Jameson ◽  
Sohail Murad
Keyword(s):  
Molecular Modeling ◽  
Temporal Resolution ◽  
High Performance ◽  
Low Cost ◽  
Membrane Surface ◽  
Experimental Studies ◽  
Nanoporous Materials ◽  
Transport Processes ◽  
Zeolite Membrane ◽  
Nanoporous Membranes

In this report we have discussed the important role of molecular modeling, especially the use of the molecular dynamics method, in investigating transport processes in nanoporous materials such as membranes. With the availability of high performance computers, molecular modeling can now be used to study rather complex systems at a fraction of the cost or time requirements of experimental studies. Molecular modeling techniques have the advantage of being able to access spatial and temporal resolution which are difficult to reach in experimental studies. For example, sub-Angstrom level spatial resolution is very accessible as is sub-femtosecond temporal resolution. Due to these advantages, simulation can play two important roles: Firstly because of the increased spatial and temporal resolution, it can help understand phenomena not well understood. As an example, we discuss the study of reverse osmosis processes. Before simulations were used it was thought the separation of water from salt was purely a coulombic phenomenon. However, by applying molecular simulation techniques, it was clearly demonstrated that the solvation of ions made the separation in effect a steric separation and it was the flux which was strongly affected by the coulombic interactions between water and the membrane surface. Additionally, because of their relatively low cost and quick turnaround (by using multiple processor systems now increasingly available) simulations can be a useful screening tool to identify membranes for a potential application. To this end, we have described our studies in determining the most suitable zeolite membrane for redox flow battery applications. As computing facilities become more widely available and new computational methods are developed, we believe molecular modeling will become a key tool in the study of transport processes in nanoporous materials.

Hierarchical CoMoO4@Co3O4 nanocomposites on an ordered macro-porous electrode plate as a multi-dimensional electrode in high-performance supercapacitors

2017 ◽  
Vol 5 (33) ◽  
pp. 17312-17324 ◽  
Author(s):  
Mai Li ◽  
Yuanhao Wang ◽  
Hongxing Yang ◽  
Paul K. Chu
Keyword(s):  
Hydrothermal Synthesis ◽  
High Performance ◽  
Porous Electrode ◽  
Large Power ◽  
Electrode Plate

Hydrothermal synthesis of CoMoO4@Co3O4 nanocomposites on an OMEP as a multidimensional electrode, and its use in a CoMoO4@Co3O4/OMEP//AC supercapacitor, which delivered large power and stable cycling.

In situ growth of ultrathin Ni–Fe LDH nanosheets for high performance oxygen evolution reaction

2017 ◽  
Vol 4 (7) ◽  
pp. 1173-1181 ◽  
Author(s):  
Haidong Yang ◽  
Sha Luo ◽  
Yun Bao ◽  
Yutong Luo ◽  
Jun Jin ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Copper Foil ◽  
Catalytic Performance ◽  
In Situ Growth ◽  
Ultrathin Nanosheet

The ultrathin Ni70Fe30LDH nanosheets were successfullyin situgrown on anodic polarized copper foil, denoted as u-Ni70Fe30LDHs/a-CF. Benefiting from the ultrathin nanosheet structure, the catalyst exhibits remarkable catalytic performance for OER in 1 M KOH solution.

O/W interface-assisted hydrothermal synthesis of NiCo2S4 hollow spheres for high-performance supercapacitors

2016 ◽  
Vol 294 (8) ◽  
pp. 1325-1332 ◽  
Author(s):  
Zhongchun Li ◽  
Yun Qu ◽  
Minggui Wang ◽  
Yimin Hu ◽  
Jie Han ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
High Performance ◽  
Hollow Spheres
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