Abstract
Work on an advanced calcium-based sorbent for desulfurizing hot coal gas has led to the development of a unique material in the form of spherical pellets, which have a limestone-based core encased in a strong supporting shell. Strong pellets are prepared by incorporating some calcium aluminate cement in the core and a larger amount in the shell, together with limestone. The pellets are prepared by a two-step pelletizing method, followed by steam curing and heat treatment. The pellets are capable of absorbing relatively large amounts of hydrogen sulfide at high temperature (e.g. 1150–1200 K) and can be regenerated by a cyclic oxidation and reduction process.
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