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Số người truy cập: 107,071,029

 Nickel Sulfides Decorated SiC Foam for the Low Temperature Conversion of H2S into Elemental Sulfur
Tác giả hoặc Nhóm tác giả: Cuong Duong-Viet, Lam Nguyen-Dinh, Yuefeng Liu, Giulia Tuci, Giuliano Giambastiani and Cuong Pham-Huu
Nơi đăng: Molecules (Journal - MDPI); Số: 23;Từ->đến trang: 1528;Năm: 2018
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
The selective oxidation of H2S to elemental sulfur was carried out on a NiS2/SiC foam catalyst under reaction temperatures between 40 and 80 ◦C using highly H2S enriched effluents (from 0.5 to 1 vol.%). The amphiphilic properties of SiC foam provide an ideal support for the anchoring and growth of a NiS2 active phase. The NiS2/SiC composite was employed for the desulfurization of highly H2S-rich effluents under discontinuous mode with almost complete H2S conversion (nearly 100% for 0.5 and 1 vol.% of H2S) and sulfur selectivity (from 99.6 to 96.0% at 40 and 80 ◦C, respectively), together with an unprecedented sulfur-storage capacity. Solid sulfur was produced in large aggregates at the outer catalyst surface and relatively high H2S conversion was maintained until sulfur deposits reached 140 wt.% of the starting catalyst weight. Notably, the spent NiS2/SiCfoam catalyst fully recovered its pristine performance (H2S conversion, selectivity and sulfur-storage capacity) upon regeneration at 320 ◦C under He, and thus, it is destined to become a benchmark desulfurization system for operating in discontinuous mode.
ABSTRACT
The selective oxidation of H2S to elemental sulfur was carried out on a NiS2/SiC foam catalyst under reaction temperatures between 40 and 80 ◦C using highly H2S enriched effluents (from 0.5 to 1 vol.%). The amphiphilic properties of SiC foam provide an ideal support for the anchoring and growth of a NiS2 active phase. The NiS2/SiC composite was employed for the desulfurization of highly H2S-rich effluents under discontinuous mode with almost complete H2S conversion (nearly 100% for 0.5 and 1 vol.% of H2S) and sulfur selectivity (from 99.6 to 96.0% at 40 and 80 ◦C, respectively), together with an unprecedented sulfur-storage capacity. Solid sulfur was produced in large aggregates at the outer catalyst surface and relatively high H2S conversion was maintained until sulfur deposits reached 140 wt.% of the starting catalyst weight. Notably, the spent NiS2/SiCfoam catalyst fully recovered its pristine performance (H2S conversion, selectivity and sulfur-storage capacity) upon regeneration at 320 ◦C under He, and thus, it is destined to become a benchmark desulfurization system for operating in discontinuous mode.
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