Rapid thermal processing and separation performance of columnar MFI membranes on porous stainless steel tubes

2011 ◽  
Vol 4 (9) ◽  
pp. 3479 ◽  
Author(s):  
Jared A. Stoeger ◽  
Jungkyu Choi ◽  
Michael Tsapatsis
Keyword(s):  
Stainless Steel ◽  
Thermal Processing ◽  
Rapid Thermal Processing ◽  
Separation Performance ◽  
Steel Tubes ◽  
Porous Stainless Steel

Grain Boundary Defect Elimination in a Zeolite Membrane by Rapid Thermal Processing

Science ◽  
2009 ◽  
Vol 325 (5940) ◽  
pp. 590-593 ◽  
Author(s):  
Jungkyu Choi ◽  
Hae-Kwon Jeong ◽  
Mark A. Snyder ◽  
Jared A. Stoeger ◽  
Richard I. Masel ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Thermal Processing ◽  
Molecular Sieve ◽  
Rapid Thermal Processing ◽  
Zeolite Membrane ◽  
Separation Performance ◽  
Transport Pathways ◽  
Scalable Production ◽  
Defect Elimination ◽  
High Separation

Microporous molecular sieve catalysts and adsorbents discriminate molecules on the basis of size and shape. Interest in molecular sieve films stems from their potential for energy-efficient membrane separations. However, grain boundary defects, formed in response to stresses induced by heat treatment, compromise their selectivity by creating nonselective transport pathways for permeating molecules. We show that rapid thermal processing can improve the separation performance of thick columnar films of a certain zeolite (silicalite-1) by eliminating grain boundary defects, possibly by strengthening grain bonding at the grain boundaries. This methodology enables the preparation of silicalite-1 membranes with high separation performance for aromatic and linear versus branched hydrocarbon isomers and holds promise for realizing high-throughput and scalable production of these zeolite membranes with improved energy efficiency.

Preparation and permeability of ZSM-35 zeolite membranes on porous stainless steel tubes

2007 ◽  
Vol 1 (3) ◽  
pp. 217-220
Author(s):  
Gang Zhu ◽  
Jinqu Wang ◽  
Yan Zhang ◽  
Jinming Lu ◽  
Jinghai Xiu
Keyword(s):  
Stainless Steel ◽  
Steel Tubes ◽  
Zeolite Membranes ◽  
Porous Stainless Steel

Influence of the rotation rate of porous stainless steel tubes on electroless palladium deposition

2015 ◽  
Vol 475 ◽  
pp. 259-265 ◽  
Author(s):  
Yen-Hsun Chi ◽  
Jing-Jie Lin ◽  
Yu-Li Lin ◽  
Chang-Chung Yang ◽  
Jin-Hua Huang
Keyword(s):  
Stainless Steel ◽  
Rotation Rate ◽  
Steel Tubes ◽  
Porous Stainless Steel

Preparation of thin Pd membrane on porous stainless steel tubes modified by a two-step method

2010 ◽  
Vol 35 (12) ◽  
pp. 6303-6310 ◽  
Author(s):  
Yen-Hsun Chi ◽  
Pei-Shan Yen ◽  
Ming-Shan Jeng ◽  
Shu-Ting Ko ◽  
Tai-Chou Lee
Keyword(s):  
Stainless Steel ◽  
Step Method ◽  
Steel Tubes ◽  
Porous Stainless Steel ◽  
Pd Membrane

Natural clinoptilolite composite membranes on tubular stainless steel supports for water softening

2014 ◽  
Vol 70 (8) ◽  
pp. 1412-1418 ◽  
Author(s):  
Solmaz Adamaref ◽  
Weizhu An ◽  
Maria Ophelia Jarligo ◽  
Tetyana Kuznicki ◽  
Steven M. Kuznicki
Keyword(s):  
Stainless Steel ◽  
Tap Water ◽  
Scale Up ◽  
Slip Casting ◽  
Composite Membranes ◽  
Water Desalination ◽  
Water Softening ◽  
Steel Tubes ◽  
Porous Stainless Steel ◽  
Natural Clinoptilolite

Disk membranes generated from high-purity natural clinoptilolite mineral rock have shown promising water desalination and de-oiling performance. In order to scale up production of these types of membranes for industrial wastewater treatment applications, a coating strategy was devised. A composite mixture of natural clinoptilolite from St. Cloud (Winston, NM, USA) and aluminum phosphate was deposited on the inner surface of porous stainless steel tubes by the slip casting technique. The commercial porous stainless steel tubes were pre-coated with a TiO2 layer of about 10 μm. Phase composition and morphology of the coating materials were investigated using X-ray diffraction and scanning electron microscopy. Water softening performance of the fabricated membranes was evaluated using Edmonton (Alberta, Canada) municipal tap water as feed source. Preliminary experimental results show a high water flux of 7.7 kg/(m2 h) and 75% reduction of hardness and conductivity in a once-through membrane process at 95 °C and feed pressure of 780 kPa. These results show that natural zeolite coated, stainless steel tubular membranes have high potential for large-scale purification of oil sands steam-assisted gravity drainage water at high temperature and pressure requirements.

Pyrolytic carbon filaments and associated catalytic particles formed in steel tubes

1984 ◽  
Vol 42 ◽  
pp. 662-663
Author(s):  
Y. L. Chen ◽  
J. R. Bradley
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Catalyst Particle ◽  
Pyrolytic Carbon ◽  
Plain Carbon Steel ◽  
304 Stainless Steel ◽  
Hydrocarbon Gases ◽  
Steel Tubes ◽  
Filamentous Carbon ◽  
Carbon Filaments

Considerable effort has been directed toward an improved understanding of the production of the strong and stiff ∼ 1-20 μm diameter pyrolytic carbon fibers of the type reported by Koyama and, more recently, by Tibbetts. These macroscopic fibers are produced when pyrolytic carbon filaments (∼ 0.1 μm or less in diameter) are thickened by deposition of carbon during thermal decomposition of hydrocarbon gases. Each such precursor filament normally lengthens in association with an attached catalyst particle. The subject of filamentous carbon formation and much of the work on characterization of the catalyst particles have been reviewed thoroughly by Baker and Harris. However, identification of the catalyst particles remains a problem of continuing interest. The purpose of this work was to characterize the microstructure of the pyrolytic carbon filaments and the catalyst particles formed inside stainless steel and plain carbon steel tubes. For the present study, natural gas (∼; 97 % methane) was passed through type 304 stainless steel and SAE 1020 plain carbon steel tubes at 1240°K.

Sign in / Sign up

Export Citation Format

Share Document