Activated carbons were used to selectively remove NOx from simulated flue gas at temperatures between 25 and 125 °C. Processing conditions and physical/chemical characteristics of the carbons which affected NOx adsorption, storage, and release were investigated. Oxygen as a coreactant was necessary to maximize the conversion of NO to NO2 and condensation of NO2 within the pores of the carbons. A NO-to-NO2 conversion mechanism is presented and discussed relative to previous research. A process for selectively removing NOx and concentrating it as NO2 in an alternate process stream is outlined. The purified NO2 stream could be used for chemicals manufacturing.
In Sandra Cisneros’s The House on Mango Street, deciphering two key motifs—the rose and trees—is fundamental to unpacking the central tension of the book: the protagonist’s desire to leave Mango Street and return in writing. While the tree motif is well-studied, that of the rose has eluded critical attention. This article shows how Cisneros unveils the centuries of patriarchal oppression distilled in the image of the rose and, in turn, offers new metaphors for women seeking to escape traditional constraints.
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