NDLI: Cu-Cr-O and Cu-Ce-O Regenerable Oxide Sorbents for Hot Gas Desulfurization

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Cu-Cr-O and Cu-Ce-O Regenerable Oxide Sorbents for Hot Gas Desulfurization

Content Provider	Semantic Scholar
Author	Flytzani-Stephanopoulos, Maria
Copyright Year	1997
Abstract	Binary Cu-Cr-O and Cu-Ce-O oxides were studied in this work as regenerable sorbents for high-temperature fuel gas desulfurization. CuO-Cr2O3 and CuO-CeO2 sorbents can remove H2S from simulated coal-derived fuel gas to less than 5-10 ppmv in the temperature range of 650-850 °C. The presence of stable CuCr2O4 in CuO-Cr2O3 solids retains some copper in the Cu2+ or Cu1+ oxidation state, which can account for the high H2S removal efficiency. In CuOCeO2 sorbents, however, CuO is easily reduced to copper metal. Participation of reduced cerium oxide in sulfidation can explain the observed high desulfurization efficiency. TGA tests and XRD analysis indicate that sulfidation proceeds through partial initial reduction of the CuOCr2O3 sorbents: CuO f Cu/Cu2O f CuxS (x < 2). Reduction kinetics were studied in the TGA over temperature ranges of 550-850 and 350-850 °C, respectively, for the CuO-Cr2O3 and CuO-CeO2 materials. The sulfidation kinetic parameters were measured in the temperature range of 450-850 °C after prereduction of both sorbents. The sulfidation of metal copper in Cr2O3 and CeO2-x matrices is a fast reaction with low activation energy, 19.8 and 16.6 kJ/mol, respectively. Both types of sorbents can be fully regenerated with diluted air. The regeneration temperature affects the reaction pathway and the regenerability of the solid composition.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://ase.tufts.edu/nano-cel/publications/Cu-Cr-OandCu-Ce-ORegen.pdf
Language	English
Access Restriction	Open
Subject Keyword	Cerium Chromium Coal Copper Copper(I) oxide Copper(II) oxide DUOXA1 gene Gene regulatory network Guilty Gear Xrd Kinetics Internet Protocol Less Than Natural regeneration Oxides TBX1 wt Allele Truevision TGA ceric oxide cupric cation kilojoule (kJ) oxidation solid substance
Content Type	Text
Resource Type	Article

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