SO2, reduction

Carbon dioxide as additive improves the behavior of (Li02C0CH2)2 films formed above intercalation potentials in EC/DEC-based electrolytes due to increased formation of Li 2 CO 3 [200], It is interesting to note that SO2 reduction occurs at quite high potentials, before the reduction of other electrolyte components films contain inorganic and organic lithium salts [201]. 

A study on the SO2 reduction by CO over SnOi-ZrOi catalysts... 

It was reported that various catalysts and reductants have been utilized in DSRP for the SO2 reduction [1-5]. In this study, appropriate catalysts were developed for DSRP. The Sn02-Zr02 catalyst was prepared by co-precipitation method and used for the catalysts in DSRP. The characteristics of SO2 reduction were investigated with CO as a reducing gas. 

The performance of Zr02 catalyst for the SO2 reduction by CO was also evaluated in this study. Experiment was carried out by varying temperature from 450C to 550 C at space velocity of 10000 with [CO]/[S02] molar ratio of 2.0. Fig. 3 shows the effect of the... 

Fig. 2. The effect of reaction temperature on SO2 reduction by CO over Sn02 catalyst.

Catalano, L., "Industrial NSPS Likely to Force Scrubbing for SO2 Reduction," Power, June, 1985, pp. 7-9. 

Fig. 15.1. Flue-gas treatment by a conventional process comprising a fabric filter for fly-ash removal, a wet scrubber for SO2 reduction and a selective catalytic reduction unit for NOx treatment (from Ref. [4]).

SO2 reduction with H2S + catalyst (Claus) SO2 reduction with CH4 + catalyst to H2S, then amine scrub (e.g.. none s... 

SO2 reduction in heated coal bed, Resox process none S... 

Since 1988 a new concept has been agreed both nationally and internationally to try to improve this situation by optimizing costs and benefits. This is the critical loads/levels approach and it has been adopted as the basis for 1994 UN ECE Second Sulfur Dioxide Protocol, which commits signatories to the Convention on LRTAP to further SO2 reductions up to and beyond the year 2005. Action on this Protocol will produce significant reductions in the emissions of SO2 and sulfate deposition over the next decade, till 2005. 

Coal from fossil-fuel fired electric utilities accounts for most of SO2 emissions in the United States. Title IV of the 1990 CAAA set an annual 9 million ton cap on SO2 emissions from all fossil fuel fired electric utilities. This cap, which is to be fully achieved by 2010, requires the affected electric utilities to reduce their aggregate SO2 emissions by 10 million tons below their 1980 levels. Along with requiring substantial SO2 reductions. Title IV also abandoned the command-and-control approach to the regulation of utilities, where utilities were required to meet individual emission standards set by regulators, in favor of a more flexible, cost-efficient tradable permit... 

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