The Removal Of Carbonyl Sulfide Over MgAlCe Composite Oxide

Carbon monoxide (CO) is a feed gas of C1 (one carbon) known in the chemical industry as a large constituent in yellow phosphorous tail gas. Carbonyl Sulfide (COS), however, is a harmful gas which may adversely affect the use of CO requiring its removal. Catalytic hydrolysis was selected to remove COS. MgAlCe composite metal oxide was prepared over the precursor of MgAlCe hydrotalcite-like compounds. The preparation of MgAlCe composite metal oxide was screened, including metal ratio, pH and calcination temperature. The activity evaluation of catalysts under optimal conditions showed that MgAlCe catalyst for the COS removal has high catalytic efficiency and long catalytic time in the low concentration of COS. However, the reaction happened in the ideal state,99.99% N2 as the carrier gas. Therefore, in order to evaluate the catalytic activation in the real conditions, the effects of catalyst on the COS was carried out. The content of CO in the yellow phosphorus tail gas is more than 85%, so the purity for 95% CO was used to a carrier gas to remove COS. And it found that it has a higher catalytic activity than its in CO atmosphere, but the catalytic efficiency did not reach 100%. And the catalytic efficiency is lower than its in N2 as carrier gas on the removal of COS. It showed that the existence of CO influence the catalytic activity. In-situ IR was processed in order to illustrate the reaction path in different carrier gases. Quantum chemistry calculation was carried out through the Dmol3 module of Material Studio, and adsorption energy on catalyst was also calculated.The removal of COS over MgAlCe composite metal oxide was reacted because of the ion-dipole interaction. Nitrogen was not interaction with catalytic surface because Nitrogen is non-polar substance. However, carbonyl sulfide is a polar substance, and the instantaneous reaction was processed between COS and catalyst. In CO atmosphere, the quantity of CO is more than the quantity of COS. However, CO reacted with catalytic surface was a reversible reaction. Subsequently, COS reacted with catalytic surface. As a result, the instantaneous reaction was reacted in N2 atmosphere, and non-instantaneous reaction was reacted in CO atmosphere. It is consistent with the result of experiment. The result of experimental characterization and theoretical calculation explained the experimental phenomenon. This study systematic explored the removal of COS in yellow phosphorus tail gas over MgAlCe composite metal oxide. At the same time, the removal effect of COS in different carrier gases were studied. It provided a reference for the COS remove in yellow phosphorus tail gas.