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Analyses of Oxyanion Materials by Prompt Gamma Activation Analysis

Description: Prompt gamma activation analysis (PGAA) has been used to analyze metal ion oxyanion materials that have multiple applications, including medicine, materials, catalysts, and electronics. The significance for the need for accurate, highly sensitive analyses for the materials is discussed in the context of quality control of end products containing the parent element in each material. Applications of the analytical data for input to models and theoretical calculations related to the electronic and… more
Date: March 24, 2008
Creator: Firestone, Richard B.; Perry, D. L.; English, G. A.; Firestone, R. B.; Leung, K. N.; Garabedian, G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Formic Acid Dehydrogenation on Au-Based Catalysts at Near-Ambient Temperatures

Description: Formic acid (HCOOH) is a convenient hydrogen carrier in fuel cells designed for portable use. Recent studies have shown that HCOOH decomposition is catalyzed with Ru-based complexes in the aqueous phase at near-ambient temperatures. HCOOH decomposition reactions are used frequently to probe the effects of alloying and cluster size and of geometric and electronic factors in catalysis. These studies have concluded that Pt is the most active metal for HCOOH decomposition, at least as large crystal… more
Date: November 24, 2008
Creator: Ojeda, Manuel & Iglesia, Enrique
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Shift conversion and methanation in coal gasification: bench-scale evaluation of a sulfur-resistant catalyst. Final report. [Iridium-promoted nickel catalysts supported or aluminium oxide]

Description: The results of this study demonstrate that the Ir-promoted Ni/Al/sub 2/O/sub 3/ catalyst possesses several valuable and superior characteristics when used for catalytic methanation under typical industrial conditions. These properties include: higher activity by a factor of > 2 than that of the unpromoted Ni/Al/sub 2/O/sub 3/ catalyst; enhanced resistance to deactivation by hydrogen sulfide during exposure to contaminated feedstock, as manifested by the prolonged high methanation activity and e… more
Date: October 24, 1980
Creator: Wood, B. J.; McCarty, J. G.; Sheridan, D.; Ablow, C. M. & Wise, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of improved iron Fischer-Tropsch catalysts. Quarterly technical progress report, 1 January 1991--31 March 1991

Description: The objective of proposed research is development of catalysts with enhanced slurry phase activity and better selectivity to fuel range products, through a more detailed understanding and systematic studies of the effects of pretreatment procedures and promoters/binders (silica) on catalyst performance.
Date: April 24, 1991
Creator: Bukur, D. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of improved iron Fischer-Tropsch catalysts. Quarterly technical progress report, 1 January 1992--31 March 1992

Description: Three tests (two fixed bed and one stirred tank slurry reactor) were completed during the reporting period. Also, the work on catalyst characterization by different techniques (atomic absorption, BET surface area and pore size distribution and x-ray powder diffraction).The performance of a precipitated iron catalyst with nominal composition lOOFe/0.3Cu/0.8K has been evaluated in two fixed bed reactor tests designated FB-0142 and FB-0352 following pretreatment with syngas (H{sub 2}/CO=0.67) at 2… more
Date: April 24, 1992
Creator: Bukur, D. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Synthesis of octane enhancers during slurry-phase Fischer-Tropsch. [801Methyl tert-butyl ether]

Description: The objective of this project is to investigate three possible routes to the formation of ethers, in particular methyl tert-butyl ether (MTBE), during slurry phase Fischer-Tropsch reaction. The three reaction schemes to be investigated are: (1) Addition of isobutylene during the formation of methanol and/or higher alcohols directly from CO and H{sub 2} during slurry-phase Fischer-Tropsch. (2) Addition of isobutylene to FT liquid products including alcohols in a slurry-phase reactor containing a… more
Date: June 24, 1992
Creator: Marcelin, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of improved iron Fischer-Tropsch catalysts. [Iron catalyst with nominal composition 100Fe/0. 3Cu/0. 8K]

Description: Three tests (two fixed bed and one stirred tank slurry reactor) were completed during the reporting period. Also, the work on catalyst characterization by different techniques (atomic absorption, BET surface area and pore size distribution and x-ray powder diffraction).The performance of a precipitated iron catalyst with nominal composition lOOFe/0.3Cu/0.8K has been evaluated in two fixed bed reactor tests designated FB-0142 and FB-0352 following pretreatment with syngas (H{sub 2}/CO=0.67) at 2… more
Date: April 24, 1992
Creator: Bukur, D. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis of octane enhancers during slurry-phase Fischer-Tropsch. Quarterly technical progress report No. 6, January 1, 1992--March 31, 1992

Description: The objective of this project is to investigate three possible routes to the formation of ethers, in particular methyl tert-butyl ether (MTBE), during slurry phase Fischer-Tropsch reaction. The three reaction schemes to be investigated are: (1) Addition of isobutylene during the formation of methanol and/or higher alcohols directly from CO and H{sub 2} during slurry-phase Fischer-Tropsch. (2) Addition of isobutylene to FT liquid products including alcohols in a slurry-phase reactor containing a… more
Date: June 24, 1992
Creator: Marcelin, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Restructuring of hex-Pt(100) under CO gas environments: formation of 2-D nanoclusters

Description: The atomic-scale restructuring of hex-Pt(100) induced by carbon monoxide with a wide pressure range was studied with a newly designed chamber-in-chamber high-pressure STM and theoretical calculations. Both experimental and DFT calculation results show that CO molecules are bound to Pt nanoclusters through a tilted on-top configuration with a separation of {approx}3.7-4.1 {angstrom}. The phenomenon of restructuring of metal catalyst surfaces induced by adsorption, and in particular the formation… more
Date: April 24, 2009
Creator: Tao, Feng; Dag, Sefa; Wang, Lin-Wang; Liu, Zhi; Butcher, Derek; Salmeron, Miquel et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Down Select Report of Chemical Hydrogen Storage Materials, Catalysts, and Spent Fuel Regeneration Processes

Description: The DOE Hydrogen Storage Program is focused on identifying and developing viable hydrogen storage systems for onboard vehicular applications. The program funds exploratory research directed at identifying new materials and concepts for storage of hydrogen having high gravimetric and volumetric capacities that have the potential to meet long term technical targets for onboard storage. Approaches currently being examined are reversible metal hydride storage materials, reversible hydrogen sorption… more
Date: August 24, 2008
Creator: Ott, Kevin; Linehan, Sue; Lipiecki, Frank & Aardahl, Christopher L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydrogen Filling Station

Description: Hydrogen is an environmentally attractive transportation fuel that has the potential to displace fossil fuels. The Freedom CAR and Freedom FUEL initiatives emphasize the importance of hydrogen as a future transportation fuel. Presently, Las Vegas has one hydrogen fueling station powered by natural gas. However, the use of traditional sources of energy to produce hydrogen does not maximize the benefit. The hydrogen fueling station developed under this grant used electrolysis units and solar ener… more
Date: February 24, 2010
Creator: Boehm, Robert F; Sabacky, Bruce; Anderson II, Everett B; Haberman, David; Al-Hassin, Mowafak; He, Xiaoming et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Nanocrystal bilayer for tandem catalysis

Description: Supported catalysts are widely used in industry and can be optimized by tuning the composition and interface of the metal nanoparticles and oxide supports. Rational design of metal-metal oxide interfaces in nanostructured catalysts is critical to achieve better reaction activities and selectivities. We introduce here a new class of nanocrystal tandem catalysts that have multiple metal-metal oxide interfaces for the catalysis of sequential reactions. We utilized a nanocrystal bilayer structure f… more
Date: January 24, 2011
Creator: Yamada, Yusuke; Tsung, Chia Kuang; Huang, Wenyu; Huo, Ziyang; E.Habas, Susan E.; Soejima, Tetsuro et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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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
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Final Report

Description: Under our grant, DE-FG02-03ER15480, "Early transition metal oxides as catalysts: crossing scales from clusters to single crystals to functioning materials," catalytic activity of high surface area, powdered transition metal oxides (TMO, e.g. vanadium, niobium, molybdenum, and tungsten) supported on Al2O3, SiO2, ZrO2 and TiO2 have been extensively studied. In contrast, virtually no studies have been conducted for TMOs supported on well-ordered, single-crystalline oxides. This is largely due to a… more
Date: April 24, 2007
Creator: White, John M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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PERFORMANCE AND DURABILITY OF THE PSA PEUGEOT CITROEN'S DPF SYSTEM ON A TAXI FLEET IN THE PARIS AREA

Description: The use of Diesel engines has strongly increased during the last years and now represents 40% of the sales in Europe and up to 50% of the number of cars in circulation for some countries. This success is linked not only to the economical aspect of the use of such vehicles, but also to the recent technological improvements of these engines. The new technical solutions (high pressure direct injection, turbocharger) have indeed allowed the increase of these engine performances while decreasing the… more
Date: August 24, 2003
Creator: COROLLER, P & PLASSAT, G
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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HYDROGEN GENERATION FROM PLASMATRON REFORMERS: A PROMISING TECHNOLOGY FOR NOX ADSORBER REGENERATION AND OTHER AUTOMOTIVE APPLICATIONS

Description: Plasmatron reformers are being developed at MIT and ArvinMeritor [1]. In these reformers a special low power electrical discharge is used to promote partial oxidation conversion of hydrocarbon fuels into hydrogen and CO. The partial oxidation reaction of this very fuel rich mixture is difficult to initiate. The plasmatron provides continuous enhanced volume initiation. To minimize electrode erosion and electrical power requirements, a low current, high voltage discharge with wide area electrode… more
Date: August 24, 2003
Creator: Bromberg, L.; Crane, S; Rabinovich, A.; Kong, Y; Cohn, D; Heywood, J et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of Novel Electrocatalysts for Proton Exchange Membrane Fuel Cells: Final Report

Description: Fuel cells are electrochemical devices that convert the available chemical free energy directly into electrical energy, without going through heat exchange process. Of all different types of fuel cells, the Proton Exchange Membrane Fuel Cell (PEMFC) is one of the most promising power sources for stand-alone utility and electric vehicle applications. Platinum (Pt) Catalyst is used for both fuel and air electrodes in PEMFCs. However, carbon monoxide (CO) contamination of H{sub 2} greatly affects … more
Date: April 24, 2003
Creator: Ilias, Shamsuddin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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APBF-DEC NOx Adsorber/DPF Project: Light-Duty Passenger Car Platform

Description: A 1.9L turbo direct injection (TDI) diesel engine was modified to achieve the upcoming Tier 2 Bin 5 emission standard in combination with a NOx adsorber catalyst (NAC) and a diesel particulate filter (DPF). The primary objective for developing this test bed is to investigating the effects of different fuel sulfur contents on the performance of an advanced emission control system (ECS) in a light-duty application. During the development process, the engine-out emissions were minimized by applyin… more
Date: August 24, 2003
Creator: Tomazic, D; Tatur, M & Thornton, M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Diesel Reformers for Lean Nox Trap Regeneration and Other on-Board Hydrogen Applications

Description: Many solutions to meeting the 2007 and 2010 diesel emissions requirements have been suggested. On board production of hydrogen for in-cylinder combustion and exhaust after-treatment provide promising opportunities for meeting those requirements. Other benefits may include using syngas to rapidly heat up exhaust after-treatment catalysts during engine startup. HydrogenSource's development of a catalytic partial oxidation reformer for generating hydrogen from ultra-low sulfur diesel fuel is prese… more
Date: August 24, 2003
Creator: Mauss, M. & Wnuck, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SELECTIVE REDUCTION OF NOX IN OXYGEN RICH ENVIRONMENTS WITH PLASMA-ASSISTED CATALYSIS: CATALYST DEVELOPMENT AND MECHANISTIC STUDIES

Description: The control of NOx (NO and NO2) emissions from so-called ''lean-burn'' vehicle engines remains a challenge. In recent years, there have been a number of reports that show that a plasma device combined with a catalyst can reduce as high as 90% or more of NOx in simulated diesel and other ''lean-burn'' exhaust. In the case of propylene containing simulated diesel exhaust, the beneficial role of a plasma treatment is now thought to be due to oxidation of NO to NO2, and the formation of partially o… more
Date: August 24, 2003
Creator: Peden, C.; Barlow, S.; Hoard, J.; Kwak, J.; Balmer-Millar, M.; Panov, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Selective Catalytic Reduction of Diesel Engine Nox Emissions Using Ethanol as a Reductant

Description: NOx emissions from a heavy-duty diesel engine were reduced by more than 90% and 80% utilizing a full-scale ethanol-SCR system for space velocities of 21000/h and 57000/h respectively. These results were achieved for catalyst temperatures between 360 and 400 C and for C1:NOx ratios of 4-6. The SCR process appears to rapidly convert ethanol to acetaldehyde, which subsequently slipped past the catalyst at appreciable levels at a space velocity of 57000/h. Ammonia and N2O were produced during conve… more
Date: August 24, 2003
Creator: Kass, M. D.; Thomas, J. F.; Lewis, S. A., Sr.; Storey, J. M.; Domingo, N. & Graves, R. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Utilizing metal-oxide and oxide-oxide interactions for improved automotive emissions control catalysts. Final report

Description: The goal of this research program was to elucidate the structure-activity relationships associated with metal-metal oxide and metal oxide-metal oxide interfaces of relevance in automotive emissions control catalysts. Particular emphasis was placed on explaining the mechanism by which ceria (CeO{sub 2}) acts as an oxygen storage medium, oxygen transport on the surface and in the bulk of ceria, and how the ceria-zirconia interaction affects oxygen storage capacity and reactivity. These properties… more
Date: February 24, 2003
Creator: Egami, Takeshi & Vohs, John M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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BIFUNCTIONAL CATALYSTS FOR THE SELECTIVE CATALYTIC REDUCTION OF NO BY HYDROCARBONS

Description: Novel bifunctional catalysts combining two active phases, typically Cu-ZSM-5 and a modifier, were prepared and tested for the selective catalytic reduction of nitrogen oxides using propylene in order to overcome the hindering effects of water typically seen for single-phase catalysts such as Cu-ZSM-5. The catalysts were made by typical preparation techniques, but parameters could be varied to influence the catalyst. The physical characterization of the materials showed that the modification pha… more
Date: August 24, 2003
Creator: Neylon, M.; Castagnola, M.; Kropf, A. & Marshall, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

APBF-DEC NOx Adsorber/DPF Project: SUV / Pick-up Truck Platform

Description: The objective of this project is to determine the influence of diesel fuel composition on the ability of NOX adsorber catalyst (NAC) technology, in conjunction with diesel particle filters (DPFs), to achieve stringent emissions levels with a minimal fuel economy impact. The test bed for this project was intended to be a light-duty sport utility vehicle (SUV) with a goal of achieving light-duty Tier 2-Bin 5 tail pipe emission levels (0.07 g/mi. NOX and 0.01 g/mi. PM). However, with the current U… more
Date: August 24, 2003
Creator: Webb, C.; Weber, P. & Thornton, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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