Desulfurization Behavior of Cerium–Iron Mixed Metal Oxide Sorbent in Hot Coal Gas

2014-05-28T00:00:00Z (GMT) by Bo Guo Liping Chang Kechang Xie
Ce–Fe mixed metal oxide sorbent C2F3B850 was prepared by using cerium oxide and red mud (an iron oxide waste from a steel company). The ability of C2F3B850 (CeO<sub>2</sub>/red mud = 0.85) was evaluated over a fixed-bed reactor in a simulated coal-derived gas. It was found that the main active components of sorbent C2F3B850 were cerium and iron oxides, the addition of red mud in CeO<sub>2</sub>-based sorbent could decrease sulfurization temperature, and 500 °C is the best temperature for sulfurization in the range of 500–700 °C. After eight successive sulfurization–regeneration cycles over C2F3B850, the regenerated sorbent still performed well with no apparent deterioration. The average breakthrough sulfur capacity corresponding to H<sub>2</sub>S concentrations below 50 ppmv is 9.97 (g S/100 g sorbent). Sorbent C2F3B850 during successive sulfurization–regeneration cycles was characterized by means of X-ray photoelectron spectroscopy, X-ray diffraction, and nitrogen adsorption–desorption techniques. The results reveal that the C2F3B850 sorbent with good durability, high efficiency, and high mechanical strength is suitable for desulfurization of hot coal-based gas in the chemical industry.