Abstract

Steam gasification of a model coke was conducted under various experimental conditions using a specially designed thermogravimetric analyser. The reactivity of a heat-treated German hard-coal char was determined in the range 973–1173 K. The char was also loaded with different amounts of sodium lignosulfonate by an incipient wetting technique, and the reactivity was measured under identical conditions. The sodium lignosulfonate enhanced the gasification rate considerably. The reactivity was even higher than that of char samples loaded with corresponding amounts of sodium carbonate. Sodium lignosulfonate is a more efficient catalyst in the range 973–1023 K, and this can be attributed to its better dispersion throughout the carbon matrix. Its higher efficiency coupled with its low cost qualifies sodium lignosulfonate as a highly suitable catalyst for any low-temperature allothermal gasification process.

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