Synthesis of Defect-Free FAU-Type Zeolite Membranes and Separation for Dry and Moist CO<sub>2</sub>/N<sub>2</sub> Mixtures

Gu, Xuehong; Dong, Junhang; Nenoff, Tina M.

doi:10.1021/ie049263i

Cited by 160 publications

(124 citation statements)

References 37 publications

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“…For example, Dong and co-workers 68 reported that the addition of water vapor to the CO 2 /N 2 feed gas drastically reduced CO 2 and N 2 permeances and altered the membrane selectivity at low temperature (Ͻ80°C), but enhanced CO 2 selectivity at elevated temperature (140-200°C). Noble and Falconer 69 have likewise demonstrated that their SAPO-4 zeolite membranes can be used to separate CO 2 from CH 4 under a variety of pressures and temperatures, with high selectivities at 30 atm and 50°C.…”

Section: Membranes For Hydrogen Purification: An Importantmentioning

confidence: 99%

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

Nenoff¹,

Spontak²,

Aberg³

2006

MRS Bull.

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Production of pure molecular hydrogen is essential to the realization of the proposed “hydrogen economy” that could ultimately provide hydrogen as a clean, renewable source of energy; eliminate the industrialized world's dependence on petroleum; and reduce the generation of greenhouse gases linked to global warming. A crucial step in obtaining pure hydrogen is separating it from other gaseous compounds—mainly CO2—that often accompany hydrogen in industrial chemical reactions. Advanced membrane technology may prove to be the key to the successful, economical production of molecular hydrogen.Size-sieving glassy polymer membranes can separate H2 on the basis of its small size. Alternatively, reverse-selective rubbery polymers can expedite the passage and, hence, removal of CO2 due to its relatively high solubility in such membranes alone or in conjunction with dissociative chemical reactions. Transition-metal membranes and their alloys can adsorb H2 molecules, dissociate the molecules into H atoms for transport through interstitial sites, and subsequently recombine the H atoms to form molecular H2 again on the opposite membrane side. Microporous amorphous silica and zeolite membranes comprising thin films on a multilayer porous support exhibit good sorption selectivity and high diffusion mobilities for H2, leading to high H2 fluxes. Finally, carbon-based membranes, including carbon nanotubes, may be viable for H2 separation on the basis of selective surface flow and molecular sieving. A wide variety of materials challenges exist in hydrogen purification, and the objective of this issue of MRS Bulletin is to address those challenges and their potential solutions from basic principles.

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Section: Membranes For Hydrogen Purification: An Importantmentioning

confidence: 99%

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

Nenoff¹,

Spontak²,

Aberg³

2006

MRS Bull.

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“…The overall molar composition of the synthesis gel was Al 2 O 3 : 12.8SiO 2 : 17Na 2 O : 675H 2 O. 37 Once the solution was thoroughly mixed, it was heated for 12 hours at 363 K in an autoclave for hydrothermal crystallization. After the hydrothermal treatment, the powders were recovered from the autoclave and washed with DI water to a pH of ~7 by centrifuging.…”

Section: Zeolite Particle Synthesismentioning

confidence: 99%

Development of platinum-loaded Y-type zeolite catalysts for high efficiency conversion of biomass-derived carbohydrates to hydrogen.

Monroe

2007

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Production of hydrogen (H 2 ) from biomass and organic wastes is considered an effective approach to mitigating the environmental problems caused by pollutant emissions from fossil fuel combustion and allaying our dependence on the limited oil reserves. However, current technological inefficiencies render such biomass utilization economically unviable. A promising alternative to realizing the goal of hydrogen from renewable sources is to convert biomass-derived carbohydrates to H 2 . To make the process economically attractive, catalysts with higher performance and low cost need to be developed. This research aims to develop new zeolite-based catalysts for highly efficient liquid phase conversion of carbohydrates to H 2 . Particulate platinum-loaded Y-type zeolite (Pt/NaY) catalysts have been synthesized, characterized, and evaluated for H 2 production from methanol. The catalysts were also tested for liquid phase reforming of ethanol and glucose to hydrogen. 4

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“…The methods used for membrane synthesis are all reported in the literature. Detailed descriptions of each membrane synthesis methods are referenced: ZSM-5 membrane method was developed at Sandia 10 , Silicalite developed at NM Tech University 11 , FAU (zeolite Y) membranes used two different recipes by Kita 12 and Dong 13 , and metal doped ZSM-5 tube membranes at the University of Colorado 14 .…”

Section: On-line Testing Of Membranes (Pre and Post Modification)mentioning

confidence: 99%

Novel modified zeolites for energy-efficient hydrocarbon separations.

Arruebo

Dong²,

Anderson

et al. 2006

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We present synthesis, characterization and testing results of our applied research project, which focuses on the effects of surface and skeletal modification of zeolites for significant enhancements in current hydrocarbon (HC) separations. Zeolites are commonly used by the chemical and petroleum industries as catalysts and ion-exchangers. They have high potential for separations owing to their unique pore structures and adsorption properties and their thermal, mechanical and chemical properties. Because of zeolites separation properties, low cost, and robustness in industrial process, they are natural choice for use as industrial adsorbents. This is a multidisciplinary effort to research, design, develop, engineer, and test new and improved materials for the separation of branched vs. linear organic molecules found in commercially important HC streams via adsorption based separations. The focus of this project was the surface and framework modification of the commercially available zeolites , while tuning the adsorption properties and the selectivities of the bulk and membrane separations. In particular, we are interested with our partners at Goodyear Chemical, on how to apply the modified zeolites to feedstock isoprene purification. For the characterization and the property measurements of the new and improved materials powder X-ray diffraction (PXRD), Residual Gas Analyzer-Mass Spectroscopy (RGA-MS), Electron Microscopy (SEM/EDAX), temperature programmed desorption (TPD) and surface area techniques were utilized. In-situ carbonization of MFI zeolite membranes allowed for the maximum separation of isoprene from n-pentane, with a 4.1% enrichment of the binary stream with n-pentane. In four component streams, a modified MFI membrane had high selectivities for n-pentane and 1-3-pentadiene over isoprene but virtually no separation for the 2-methyl-2-butene/isoprene pair. 5 CONTENTS

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Synthesis of Defect-Free FAU-Type Zeolite Membranes and Separation for Dry and Moist CO₂/N₂ Mixtures

Cited by 160 publications

References 37 publications

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

Development of platinum-loaded Y-type zeolite catalysts for high efficiency conversion of biomass-derived carbohydrates to hydrogen.

Novel modified zeolites for energy-efficient hydrocarbon separations.

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Synthesis of Defect-Free FAU-Type Zeolite Membranes and Separation for Dry and Moist CO2/N2 Mixtures

Cited by 160 publications

References 37 publications

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

Membranes for Hydrogen Purification: An Important Step toward a Hydrogen-Based Economy

Development of platinum-loaded Y-type zeolite catalysts for high efficiency conversion of biomass-derived carbohydrates to hydrogen.

Novel modified zeolites for energy-efficient hydrocarbon separations.

Contact Info

Product

Resources

About

Synthesis of Defect-Free FAU-Type Zeolite Membranes and Separation for Dry and Moist CO₂/N₂ Mixtures