Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup Quarterly Technical Report December 1 1993 February 28 1994 written by and published by . This book was released on 1994 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation is to evaluate two novel copper-based sorbents, namely copper-chromium and copper-cerium, for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650° to 850°. Such high temperatures will be required for the new generation of gas turbines (inlet>750°C) in Integrated Gasification Combined Cycle (IGCC) systems. The effect of pre-reduction with H2, in the presence of H2O on the performance of the sorbents in cyclic sulfidation/regeneration, was studied in a thermogravimetric analyzer (TGA) and in a fixed-bed reactor at 750°C. The results of the TGA tests indicate that pre-reduction of the sorbents is very fast in either 10% or 30% H2. Without sorbent pre-reduction, sulfidation consists of two-stages, a reduction-dominating and a sulfidation-dominating stage. Sulfidation apparently takes place before reduction is complete. During regeneration some copper/cerium sulfates may have formed and Cu2O may have formed in addition to CuO. The fixed-bed reactor tests show that at 750°C: (1) prereducing the CuO-Cr2O3 with H2 does not effect the reactivity of the sorbent towards H2S at either the high or low H2 feed gas concentrations and (2) when 30% H2 was used during sulfidation of either sorbent, the first H2S breakthrough occurs earlier than when 10% H2 was used.
Download or read book Development of Novel Copper based Sorbents for Hot Gas Cleanup Technical Report December 1 1992 February 28 1993 written by and published by . This book was released on 1993 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation is to evaluate two novel copper-based sorbents (i.e. copper-chromium and copper-cerium) for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650° to 850°C. New sorbent compositions from the selected Cu-Cr-O and Cu-Ce-O binary oxides were prepared and characterized by BET N2-desorption surface area measurement following various calcination/time-temperature exposures. The general trends reported last quarter (on 11 different compositions) were validated this quarter in that both binary oxides lose surface area as the amount of CuO is increased. Time-resolved sulfidation tests were conducted at 850°C using the equimolar CuO. Cr2O3 composition. The two selected binary oxides prepared in larger qauntities (for testing in a two-inch reactor) have physical properties typical of the sorbents prepared in past programs. Two multicycle desulfurization tests, conducted this quarter on the Cu-Ce-O sorbent at 850°C, using a feed gas containing 5000 ppm H2S, 10 vol % H2 and 10 vol % H2O at a space velocity (STP) of 2000 h−1, demonstrated high sulfur removal efficiency for the first one or two cycles, and a significant reduction in efficiency in the following cycles.
Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup Quarterly Technical Report March 1 1993 May 31 1993 written by and published by . This book was released on 1993 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation is to evaluate two novel copper-based sorbents (i.e. copper-chromium and copper-cerium) for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650° to 850°C. In this program, structural and kinetic studies are conducted on various compositions of the two selected copper-based sorbents to determine the optimum sorbent composition. The effect of operating conditions on the performance of the sorbents alone with the stability and regenerability of the selected sorbents in successive sulfidation/regeneration operation are determined. Parametric multicycle desulfurization tests were conducted this quarter in a bench-scale (5-cm-diameter) quartz reactor at one atmosphere using the CuCr2O4 and CuO/CeO2 sorbents. The parameters studied included temperature, space velocity, and feed gas composition. Both sorbents were able to reduce the H2S concentration of the reactor feed gas to
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-08 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup Quarterly Technical Report December 1 1991 February 29 1992 written by and published by . This book was released on 1992 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation is to evaluate several novel copper-based binary oxides for their suitability as regenerable sorbents for hot gas cleanup application in the temperature range of 650° to 850°C. To achieve this objective, several novel copper-based binary oxide sorbents will be prepared. Experimental tests will be conducted at ambient pressure to determine the stability, sulfidation capacity, regenerability, and sulfidation kinetics of the novel sorbents. Tests will also be conducted at high pressure for the determination of the sulfidation reactivity, regenerability, and durability of the sorbents. The attrition characteristics of the sorbents will also be determined.
Download or read book Development of Novel Copper based Sorbents for Hot Gas Cleanup Final Technical Report September 1 1992 Through August 31 1993 written by Andy H. Hill and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup Quarterly Technical Report September 1 November 30 1993 written by and published by . This book was released on 1994 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation is to evaluate two novel copper-based sorbents, namely copper-chromium and copper-cerium, for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650° to 850°C. Such high temperatures will be required for the new generation of gas turbines (inlet>750°C) in Integrated Gasification Combined Cycle (IGCC) systems. The effect of pre-reduction on the performance of the sorbents as well as the rate of different reactions occurring in cyclic sulfidation/regeneration, were studied in a thermogravimetric analyzer (TGA). Sulfidation was conducted with and without H2 and H2O, and with and without pre-reduction in H2 or H2/H2O. The results of these tests indicate that reduction and regeneration of both sorbents occurs rapidly. Sulfidation of CuCr2O4, in H2O-free and H2H2O-free gas indicates the possible sulfidation of both copper and chromium. Small quantities of SO2, were released during sulfidation suggesting the possible oxidation of H2S by the sorbent. Regeneration of the CuCr2O4 was complete while regeneration of the CuO-CeO2 indicated possible limited sulfate formation.
Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup Technical Report September 1 Through November 30 1993 written by Javad Abbasian and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup Final Technical Report 1 September 1992 31 August 1993 written by and published by . This book was released on 1993 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation is to evaluate two novel copper-based sorbents, namely Cu-Cr and Cu-Ce, for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650 to 850 C. Such high temperatures will be required for the new generation of gas turbines in Integrated Gasification Combined Cycle systems. Structural and kinetic studies were conducted on various compositions of the two Cu-based sorbents to determine the optimum sorbent composition. The effect to operating conditions on the performance of the sorbents along with the stability and regenerability of the selected sorbents in successive sulfidation/regeneration operation were determined. Overall, the CuO-lean binaries (with Cr2O3 or CeO2) may benefit the H2S breakthrough levels. While this is at the expense of sulfur capacity for the Cu-Cr-O sorbents, it may not affect the capacity of the Cu-Ce-O sorbents. Parametric multicycle desulfurization tests were conducted in a bench-scale quartz reactor at one atmosphere using the CuCr2O4 and CuO-CeO2 sorbents. The parameters studied included temperature, space velocity, and feed gas composition. Both sorbents were able to reduce the H2S concentration of the reactor feed gas from 5,000 ppmv to less than 1 ppmv to 10 ppmv at 750 to 850 C. Both sorbents were found to consume H2 and produce SO2 during the initial stages of sulfidation. Analysis of partially sulfided samples identified predominantly Cu metal, the additive oxide and small amounts of oxidic copper. For the Cu-Cr-O sorbents, the latter is apparently sufficient to keep the H2S pre-breakthrough levels as low as has been reported in this work. For the Cu-Ce-O sorbents, in which very little or no oxidic copper remained, the low H2S levels may be due to the participation of CeO2, whose sulfidation is promoted by Cu.
Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup Technical Report March 1 1992 May 31 1992 written by and published by . This book was released on 1992 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation is to evaluate several novel copper-based binary oxides for their suitability as regenerable sorbents for hot gas cleanup application in the temperature range of 650° to 850°C. During this quarter cyclic sulfidation/regeneration tests of the sorbents Cu2Cr-O and Cu-Ce-0 were conducted using different compositions of the feed gases to investigate the effects of H20, H2 and CO. These tests were conducted in a packed-bed microreactor at 850°C. The results of these tests showed that H2 and CO (along with C02) had a significant effect on the H2S pre-breakthrough levels, whereas H20 did not have an effect. The physical properties of the fresh and reacted samples of the Cu-2Cr-O and Cu-Ce-0 sorbents prepared in this program and used in the cyclic sulfidation/regeneration tests were also measured. In addition, sulfidation/regeneration tests were conducted using two commercial copper chromite sorbents (G-13 and G-89, United Catalyst, Inc.) and a zinc titanate sorbent (L-3014) in a one-inch fluidized-bed reactor at 650°C. The G-13 sorbent appears to have a much higher sulfur capacity than the G-89 sorbent.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tourists Resorts written by and published by . This book was released on 1905 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup Technical Report September 1 November 30 1991 written by and published by . This book was released on 1991 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation is to evaluate several novel copper-based binary oxides for their suitability as regenerable sorbents for hot gas cleanup application in the temperature range of 650° to 850°C (1200°--1550°F). To achieve this objective, several novel copper-based binary oxide sorbents will be prepared. Experimental tests will be conducted at ambient pressure to determine the stability, sulfidation capacity, regenerability, and sulfidation kinetics of the novel sorbents. Tests will also be conducted at high pressure for the determination of the sulfidation reactivity, regenerability, and durability of the sorbents. The attrition characteristics of the sorbents will also be determined.
Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup Final Technical Report September 1 1991 August 31 1992 written by and published by . This book was released on 1992 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation was to evaluate several novel copper-based binary oxides for their suitability as regenerable sorbents for hot gas cleanup application in the temperature range of 650° to 850°C. To achieve this objective, several novel binary oxides of copper were systematically evaluated and ranked in terms of their high-temperature stability against reduction to metal, sulfidation reactivity, and regenerability. The sorbents studied included oxides of chromium, cerium, aluminum, magnesium, manganese, titanium, iron, and silicon. The results of initial testing indicated that mixed binary oxides of copper with chromium (CuCr2O4) and cerium (CuO{circle_dot}CeO2) were the most promising sorbents for such high temperature gas cleanup applications. These two sorbents were further evaluated in cyclic sulfidation/regeneration tests in 10--15 cycles to determine the effect of operating conditions on their performance. The results of this investigation indicate that the two selected sorbents, copper-chromium and copper-cerium, are capable of removing H2S from the hot fuel gas to very low levels (
Download or read book Development of Novel Copper based Sorbents for Hot gas Cleanup written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acid Precipitation written by and published by . This book was released on 1994 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
