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Highly Selective H2 Separation Zeolite Membranes for Coal Gasification Membrane Reactor Applications

Description: Zeolite membranes are thermally, chemically, and mechanically stable. They also have tunable molecular sieving and catalytic ability. These unique properties make zeolite membrane an excellent candidate for use in catalytic membrane reactor applications related to coal conversion and gasification, which need high temperature and high pressure range separation in chemically challenging environment where existing technologies are inefficient or unable to operate. Small pore, good quality, and thi… more
Date: September 24, 2007
Creator: Hong, Mei; Noble, Richard & Falconer, John
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Highly Selective H2 Separation Zeolite Membranes for Coal Gasification Membrane Reactor Applications

Description: Zeolite membranes are thermally, chemically, and mechanically stable. They also have tunable molecular sieving and catalytic ability. These unique properties make zeolite membrane an excellent candidate for use in catalytic membrane reactor applications related to coal conversion and gasification, which need high temperature and high pressure range separation in chemically challenging environment where existing technologies are inefficient or unable to operate. Small pore, good quality, and thi… more
Date: September 24, 2006
Creator: Hong, Mei; Noble, Richard D. & Falconer, John L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of cerium incorporation into zirconia on the activity ofCu/ZrO2 for methanol synthesis via CO hydrogenation

Description: The effects of Ce incorporation into ZrO2 on the catalyticperformance of Cu/ZrO2 for the hydrogenation of CO have beeninvestigated. A Ce0.3Zr0.7O2 solid solution was synthesized by forcedhydrolysis at low pH. After calcination at 873 K, XRD and Ramanspectroscopy characterization indicated that the Ce0.3Zr0.7O2 had a t''crystal structure. 1.2 wt percent Cu/Ce0.3Zr0.7O2 exhibited H2consumption peaks at low temperature (<473 K) during H2-TPRindicating a significant fraction (~; 70 percent) of Ce4+… more
Date: August 24, 2005
Creator: Pokrovski, Konstantin A.; Rhodes, Michael D. & Bell, Alexis T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Reduction and Stabilization of Plutonium Nitrate in Cation Exchange Feed and Product Solutions

Description: In the conceutration and purification of Pu by cation exchange, the feed solution must be in the plus three valence state, but the nitrate solution from a solvent extraction process contains a high% of Pu/sup 4+/ and a small amount of Pu/sup 6+/. It was desired to find a reducing agent satisfactory for the reduction of Pu/sup 4+/ and Pu/sup 6+/ in Purex product streams and to make these streams suitable as cation exchange feed. The bisulfates met the requirements for speed and completeness of r… more
Date: September 24, 1957
Creator: Brunstad, A. & Smith, R. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

TOUGHREACT User's Guide: A Simulation Program for Non-isothermal Multiphase Reactive geochemical Transport in Variable Saturated Geologic Media

Description: Coupled modeling of subsurface multiphase fluid and heat flow, solute transport and chemical reactions can be used for the assessment of mineral alteration in hydrothermal systems, waste disposal sites, acid mine drainage remediation, contaminant transport, and groundwater quality. A comprehensive non-isothermal multi-component reactive fluid flow and geochemical transport simulator, TOUGHREACT, has been developed. A wide range of subsurface thermo-physical-chemical processes is considered unde… more
Date: May 24, 2004
Creator: Xu, Tianfu; Sonnenthal, Eric; Spycher, Nicolas & Pruess, Karsten
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Test procedure for cation exchange chromatography

Description: The purpose of this test plan is to demonstrate the synthesis of inorganic antimonate ion exchangers and compare their performance against the standard organic cation exchangers. Of particular interest is the degradation rate of both inorganic and organic cation exchangers. This degradation rate will be tracked by determining the ion exchange capacity and thermal stability as a function of time, radiation dose, and chemical reaction.
Date: August 24, 1994
Creator: Cooper, T. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

(CN{sub 3}H{sub 6}){sub 2} {center_dot} Zn(HPO{sub 3}){sub 2}: A Three-Dimensional Framework Zincophosphite Containing Polyhedral 12-Rings

Description: The solution-mediated synthesis and single crystal structure of (CN{sub 3}H{sub 6}){sub 2} {center_dot} Zn(HPO{sub 3}){sub 2} are reported. This phase is built up from a three-dimensional framework of vertex-linked ZnO{sub 4} and HPO{sub 3} building units encapsulating the extra-framework guanidinium cations. The structure is stabilized by template-to-framework hydrogen bonding. The inorganic framework shows a surprising similarity to those of some known zinc phosphates. Crystal data: (CN{sub 3… more
Date: October 24, 2000
Creator: Harrison, William T. A.; Phillips, Mark L. F. & Nenoff, Tina M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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