Regenerable Sorbents for High‐Temperature Desulfurization of Syngas from Biomass Gasification

Abstract

Single-metal high-temperature solid sorbents for syngas cleaning using Mn, Ca, Fe, Cu, or Mo supported on g-Al 2 O 3 were synthesized, characterized, and tested in a fixed-bed reactor. H 2 S and SO 2 concentrations in the gas after treatment at T = 400 to 700°C were compared with thermodynamic calculations. The Mn-based sorbent showed the best ability to achieve a low sulfur residual in the gas, especially at temperatures above 600°C. Sorbents with Fe, Cu, and Mo gave SO 2 formation in the initial phase, but this could be avoided by a pre-reduction treatment of the sorbent material.