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Comparative study of the reactions of metal oxides with H sub 2 S and SO sub 2

Description: The primary objective of this project is the investigation of the effects of pore structure on the capacity of porous metal oxides for removal of gaseous pollutants from flue gases of power plants (SO{sub 2}) and hot coal gas (primarily H{sub 2}A). Specifically, we intend to appropriately exploit the differences of the sulfidation and sulfation reactions (for instance, different molar volumes of solid products) to elucidate the dependence of the sorptive capacity of a porous sorbent on its phys… more
Date: October 1, 1991
Creator: Sotirchos, S.V.
Partner: UNT Libraries Government Documents Department
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Stabilization and/or regeneration of spent sorbents from coal gasification

Description: The objective of this investigation is to determine the effects of SO{sub 2} partial pressure and reaction temperature on the conversion of sulfide containing solid wastes from coal gasifiers to stable and environmentally acceptable calcium-sulfate, while preventing the release of sulfur dioxide through undesirable side reactions during the stabilization step. An additional objective of this program is to investigate the use of the Spent Sorbent Regeneration Process (SSRP) to regenerate spent l… more
Date: January 1, 1991
Creator: Abbasian, J.
Partner: UNT Libraries Government Documents Department
open access

Comparative study of the reactions of metal oxides with H sub 2 S and SO sub 2

Description: The primary objective of this project is the investigation of the effects of pore structure on the capacity of porous metal oxides for removal of gaseous pollutants from flue gases of power plants (SO{sub 2}) and hot coal gas (primarily H{sub 2}S). Specifically, we intend to appropriately exploit the differences of the sulfidation and sulfation reactions (for instance, different molar volumes of solid products) to elucidate the dependence of the sorptive capacity of a porous sorbent on its phys… more
Date: December 1, 1991
Creator: Sotirchos, S.V.
Partner: UNT Libraries Government Documents Department
open access

Studies of in-situ calcium-based sorbents in advanced pressurized coal conversion systems

Description: The overall objective of the project is to obtain experimental data on the reactions of calcium-based sorbents in gasification systems and to evaluate or develop kinetic models applicable to the commercial design of such systems. Both air-blown coal gasification systems and second generation fluid bed combustion systems (partial gasification) will be investigated, as well as subsequent stabilization of the solid wastes (calcium sulfide/ash) produced. More specifically, the objectives are to: De… more
Date: January 1, 1992
Creator: Katta, S.; Shires, P. J. & O'Donnell, J. J.
Partner: UNT Libraries Government Documents Department
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Control of coal combustion SO[sub 2] and NO[sub x] emissions by in-boiler injection of CMA

Description: The principal objectives of the proposed research are two-fold: (A) To understand the mechanism and assess the effectiveness of sulfur capture by the chemical calcium magnesium acetate (CMA). And (B) To evaluate the NO[sub x] reduction capabilities of CMA by burning the organic constituents of the chemical (the acetate) and reducing NO to stable N[sub 2] The optimum conditions and the location of CMA introduction in the furnace will be identified. To achieve these goals water solutions of CMA o… more
Date: January 1, 1992
Creator: Levendis, Y.A. & Wise, D.L.
Partner: UNT Libraries Government Documents Department
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Low severity upgrading of F-T waxes with solid superacids

Description: To avoid methane production in F-T synthesis on Fe catalysts, efforts are being made on conversion of synthesis gas to high molecular weight hydrocarbons, such as waxes. Strong acidity of sulfated zirconium oxides, ZrO[sub 2]/SO[sub 4], is being used to pretreat long-chain paraffins with carbon numbers greater than n-C[sub 32]. Progress during this period is reported on reactivity of Pt/ZrO[sub 2]/SO[sub 4] for hydrocracking n-C[sub 32] and on effects of hydride donor solvent on hydrocracking o… more
Date: January 1, 1992
Creator: Tierney, J.W. & Wender, I.
Partner: UNT Libraries Government Documents Department
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Low severity upgrading of F-T waxes with solid superacids

Description: In the past year, we synthesized a Pt/ZrO[sub 2]/SO[sub 4] catalyst which exhibits high conversions and selectivity for desirable products from long-chain paraffins, such as n-hexadecane, n-dotriacontane(n-C[sub 32]) and a SASOL wax(C[sub 58]-C[sub 64]). The catalyst preparation procedure has been carefully worked out and is reproducible. Isomerization and hydrocracking activities of long-chain paraffins and selectivities to various products were examined under mild conditions: 443 K and 2.5 MP… more
Date: January 1, 1992
Creator: Tierney, J.W. & Wender, I.
Partner: UNT Libraries Government Documents Department
open access

Low severity upgrading of F-T waxes with solid superacids. Quarterly report

Description: To avoid methane production in F-T synthesis on Fe catalysts, efforts are being made on conversion of synthesis gas to high molecular weight hydrocarbons, such as waxes. Strong acidity of sulfated zirconium oxides, ZrO{sub 2}/SO{sub 4}, is being used to pretreat long-chain paraffins with carbon numbers greater than n-C{sub 32}. Progress during this period is reported on reactivity of Pt/ZrO{sub 2}/SO{sub 4} for hydrocracking n-C{sub 32} and on effects of hydride donor solvent on hydrocracking o… more
Date: December 31, 1992
Creator: Tierney, J. W. & Wender, I.
Partner: UNT Libraries Government Documents Department
open access

Low severity upgrading of F-T waxes with solid superacids. Quarterly report

Description: In the past year, we synthesized a Pt/ZrO{sub 2}/SO{sub 4} catalyst which exhibits high conversions and selectivity for desirable products from long-chain paraffins, such as n-hexadecane, n-dotriacontane(n-C{sub 32}) and a SASOL wax(C{sub 58}-C{sub 64}). The catalyst preparation procedure has been carefully worked out and is reproducible. Isomerization and hydrocracking activities of long-chain paraffins and selectivities to various products were examined under mild conditions: 443 K and 2.5 MP… more
Date: December 31, 1992
Creator: Tierney, J. W. & Wender, I.
Partner: UNT Libraries Government Documents Department
open access

Stabilization of spent sorbents from coal gasification. Final technical report, September 1, 1992--August 31, 1993

Description: The objective of this investigation was to determine the rates of reactions involving partially sulfided dolomite and oxygen, which is needed for the design of the reactor system for the stabilization of sulfide-containing solid wastes from gasification of high sulfur coals. To achieve this objective, samples of partially sulfided dolomite were reacted with oxygen at a variety of operating conditions in a fluidized-bed reactor. The effect of external diffusion was eliminated by using small quan… more
Date: December 31, 1993
Creator: Abbasian, J.; Hill, A. H.; Rue, D. M. & Wangerow, J. R.
Partner: UNT Libraries Government Documents Department
open access

The kinetics of sulfation of calcium oxide. [Quarterly] project status report, February 27, 1989--May 31, 1989

Description: Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. It is generally agreed that product layer diffusion limitations are the explanation for this behavior. Many investigators tried to model this observed rate change, more or less successfully. No agreement has been reached, however, as to the value of the produce layer diffusivity. Hence, in this work we want to investigate the mechanism of this process. In addition to understanding the initial kinetics,… more
Date: December 31, 1989
Creator: Sarofim, A. F. & Longwell, J. P.
Partner: UNT Libraries Government Documents Department
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The kinetics of sulfation of calcium oxide. [Quarterly] project status report, March 1, 1990--May 31, 1990

Description: The rate of sulfation of a CaO surface is rapid at first, limited by the intrinsic kinetics, but slows down with increasing conversion as a consequence of the increased resistance to diffusion through the product layer. The objectives of this study are to determine the intrinsic kinetics and the product layer diffusion pate by minimizing the resistances to gas-phase pore diffusion, and eliminating complications due to pore filling. This is achieved by the use of nonporous CaO. A wide range of p… more
Date: December 31, 1990
Creator: Sarofim, A. F. & Longwell, J. P.
Partner: UNT Libraries Government Documents Department
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The kinetics of sulfation of calcium oxide. [Quarterly] project status report, June 1, 1989--August 31, 1989

Description: Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. This behavior has generally been interpreted as product layer diffusion limitations taking over after an initial kinetic rate regime. Many investigators tried to model this observed rate change, more or less successfully. No agreement has been reached, however, as to the value of the product layer diffusivity. In this work we want to investigate the mechanism of this process. During the last quarter, m… more
Date: December 31, 1989
Creator: Sarofim, A. F. & Longwell, J. P.
Partner: UNT Libraries Government Documents Department
open access

The kinetics of sulfation of calcium oxide. [Quarterly] report No. 3, September 1, 1989--November 30, 1989

Description: Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. This behavior has generally been interpreted as product layer diffusion limitations taking over after an initial kinetic rate regime. Many investigators tried to model this observed rate change. As pore diffusion was a limiting phenomenon in most of the experiments, authors have used several pore models to described this complication, more or less successfully. Product layer diffusivity has been assume… more
Date: December 29, 1989
Creator: Sarofim, A. F. & Longwell, J. P.
Partner: UNT Libraries Government Documents Department
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LASH oxidation, waste management

Description: Temperature for highest sulfation of both as-received KRW LASH and FW LASH was found to be 1700{degrees}F in the temperature range of 1500 to 1700{degrees}F studied. No significant amount of SO{sub 2} was measured by gas analysis in the tests reported here. Confirmation of SO{sub 2} release by sulfur balance including the solids is in progress. The sulfide conversion achieved for HSCF KRW LASH including the conversion obtained in the muffle furnace was about 80%. Grinding it did not enhance the… more
Date: September 1, 1993
Creator: Shires, P. J.; Katta, S. & Henningsen, G.
Partner: UNT Libraries Government Documents Department
open access

The kinetics of sulfation of calcium oxide

Description: Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. This behavior has generally been interpreted as product layer diffusion limitations taking over after an initial kinetic rate regime. Many investigators tried to model this observed rate change. As pore diffusion was a limiting phenomenon in most of the experiments, authors have used several pore models to described this complication, more or less successfully. Product layer diffusivity has been assume… more
Date: December 29, 1989
Creator: Sarofim, A. F. & Longwell, J. P.
Partner: UNT Libraries Government Documents Department
open access

Understanding the function and performance of carbon-enhanced lead-acid batteries : milestone report for the DOE Energy Storage Systems program (FY11 Quarter 1: October through December 2010).

Description: This report describes the status of research being performed under CRADA No. SC10/01771.00 (Lead/Carbon Functionality in VRLA Batteries) between Sandia National Laboratories and East Penn Manufacturing, conducted for the U.S. Department of Energy's Energy Storage Systems Program. The Quarter 1 Milestone was completed on time. The milestone entails conducting a thorough literature review to establish the current level of understanding of the mechanisms through which carbon additions to the negat… more
Date: May 1, 2011
Creator: Shane, R. (East Penn Manufacturing, Lyon Station, PA); Enos, David George & Hund, Thomas D.
Partner: UNT Libraries Government Documents Department
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Clean gasoline reforming with superacid catalysts

Description: It has been observed for a number of the Zr catalysts that the maximum MCH conversion (ca. 20 wt.%) can be obtained in 15 min. using a reaction temperature of 150{degrees}C and 1 atm. of H{sub 2}, and no further reaction occurs during 120 minutes. Typical results for these catalysts as well as catalyst which show lower activities using the 15 min. residence time are shown in Figure 2. Both catalyst formulations, a Pt/ZrO{sub 2}/SO{sub 4} and a Fe/Mn/ZrO{sub 2}/SO{sub 4} show this behavior. The … more
Date: August 4, 1992
Creator: Davis, B. H.
Partner: UNT Libraries Government Documents Department
open access

The kinetics of sulfation of calcium oxide

Description: The objectives of this study are to determine the intrinsic kinetics and the product layer diffusion rate by minimizing the resistances to gas-phase pore diffusion, and eliminating complications due to pore filling. In the report, a grain model was used to introduce the various potentially rate-limiting processes. It was compared with results obtained with a distributed pore model by Bhatia Perlmutter (1981). Comparing the predicted behavior of the surface areas with conversion, it was even pos… more
Date: March 28, 1990
Creator: Sarofim, A. F. & Longwell, J. P.
Partner: UNT Libraries Government Documents Department
open access

The kinetics of sulfation of calcium oxide

Description: Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. It is generally agreed that product layer diffusion limitations are the explanation for this behavior. Many investigators tried to model this observed rate change, more or less successfully. No agreement has been reached, however, as to the value of the produce layer diffusivity. Hence, in this work we want to investigate the mechanism of this process. In addition to understanding the initial kinetics,… more
Date: January 1, 1989
Creator: Sarofim, A. F. & Longwell, J. P.
Partner: UNT Libraries Government Documents Department
open access

Comparative study of the reactions of metal oxides with H{sub 2}S and SO{sub 2}. Technical progress report, October--December 1991

Description: The primary objective of this project is the investigation of the effects of pore structure on the capacity of porous metal oxides for removal of gaseous pollutants from flue gases of power plants (SO{sub 2}) and hot coal gas (primarily H{sub 2}S). Specifically, we intend to appropriately exploit the differences of the sulfidation and sulfation reactions (for instance, different molar volumes of solid products) to elucidate the dependence of the sorptive capacity of a porous sorbent on its phys… more
Date: December 1, 1991
Creator: Sotirchos, S. V.
Partner: UNT Libraries Government Documents Department
open access

Comparative study of the reactions of metal oxides and carbonates with H{sub 2}S and SO{sub 2}. Final technical report, September 1990--February 1994

Description: The primary objective of this project had been the investigation of the effects of pore structure on the capacity of porous metal oxides for removal of gaseous pollutants from flue gases of power plants (SO{sub 2}) and hot coal gas (primarily H{sub 2}S). Porous calcines obtained from natural precursors (limestones and dolomites) and sorbents based on zinc oxide were used as model systems in our experimental studies, which included reactivity evolution experiments and pore structure characteriza… more
Date: March 1, 1994
Creator: Sotirchos, S. V.
Partner: UNT Libraries Government Documents Department
open access

The kinetics of sulfation of calcium oxide. [Quarterly] report No. 4, December 1, 1989--February 28, 1990

Description: The objectives of this study are to determine the intrinsic kinetics and the product layer diffusion rate by minimizing the resistances to gas-phase pore diffusion, and eliminating complications due to pore filling. In the report, a grain model was used to introduce the various potentially rate-limiting processes. It was compared with results obtained with a distributed pore model by Bhatia & Perlmutter (1981). Comparing the predicted behavior of the surface areas with conversion, it was even p… more
Date: March 28, 1990
Creator: Sarofim, A. F. & Longwell, J. P.
Partner: UNT Libraries Government Documents Department
open access

Low severity upgrading of F-T waxes with solid superacids. Progress report, March 1, 1992--May 30, 1992

Description: We have previously reported the isomerization and hydrocracking of n-hexadecane and a n-C{sub 32} straight chain paraffin with a Pt/ZrO{sub 2}/SO{sub 4} catalyst at 170{degrees}C and 350 psig of hydrogen. This study has now been extended to the treatment of a Fisher-Tropsch wax with a carbon number range from C{sub 55}-C{sub 62}. The results reported in Table 1 show that the Pt/ZrO{sub 2}/SO{sub 4} catalyst is active for the isomerization and hydrocracking of this substrate. At an 88.6 wt% conv… more
Date: July 20, 1992
Creator: Wender, I. & Tierney, J. W.
Partner: UNT Libraries Government Documents Department
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