Abstract
A series of La-Mn supported on ordered mesoporous Al2O3-CaO (OMA-2Ca) sorbents with various Mn/La molar ratio were first designed and synthesized for removal of H2S at 650–850°C. 40% 98Mn2La/OMA-2Ca exhibited satisfactory desulfurization performance at 800°C with a breakthrough sulfur capacity (BSC) of 16.15gS/100g sorbent. Elemental sulfur was formed during desulfurization as a result of synergistic catalysis of γ-Al2O3 and lanthanum oxysulfide at high temperature. The existence of high content steam in hot coal gas obviously reduced the sulfur capacity because of the formation of MnAl2O4. After five successive sulfidation-regeneration cycles, high BSC (about 90% of the initial BSC) was maintained. In addition, the characterization results indicated that the mesostructure of OMA-2Ca remained intact during sulfidation and regeneration except that the amorphous wall was converted to γ-Al2O3 phase, and active species were still well dispersed on support, which indicated the stability of Mn-La/OMA-2Ca sorbent.
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