Abstract In this article, molten sulfur containing 170ppmw of total hydrogen sulfide was subjected to catalytic degassing by monometallic and bimetallic heterogeneous catalysts. Accordingly, iron oxide/nanosilica catalyst showed excellent degassing outputs, as the cyclic catalytic degassing processes revealed that activity of this catalyst did not change significantly. This could be attributed to generation of iron sulfide species in the catalyst. The structured catalysts showed high surface area (365 m2/g) and proper mechanical strength (0.81 MPa). Using RSM-CCD, residual content of hydrogen sulfide in molten sulfur at optimum catalytic degassing conditions by iron oxide/nanosilica (1ppmw) was located at 1.51 (weight percent of iron oxide in catalyst), 245 (time, min) and 12.850 (weight of charged catalyst in 1 kg of sulfur, g). At these conditions, residual content of hydrogen sulfide in molten sulfur was also traced by application of cerium oxide/nanosilica and molybdenum oxide/nanosilica catalysts as about 54ppmw and 47ppmw, respectively. It was shown that addition of iron oxide to cerium oxide/nanosilica and molybdenum oxide/nanosilica catalysts improved their catalytic behavior and decreased the residual hydrogen sulfide content in molten sulfur to about 25ppmw and 35ppmw, respectively. The catalysts were subjected to characterization analyses including AAS, FESEM, EDS and BET.

中文翻译：

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克劳斯衍生硫在单金属和双金属纳米二氧化硅基催化剂上催化脱气的有效系统的设计和实施，并通过 RSM-CCD 进行优化

摘要 本文采用单金属和双金属多相催化剂对总硫化氢含量为170ppmw的熔融硫磺进行催化脱气。因此，氧化铁/纳米二氧化硅催化剂表现出优异的脱气输出，因为循环催化脱气过程表明该催化剂的活性没有显着变化。这可能是由于在催化剂中生成了硫化铁物质。结构化催化剂显示出高表面积 (365 m2/g) 和适当的机械强度 (0.81 MPa)。使用 RSM-CCD，在氧化铁/纳米二氧化硅 (1ppmw) 的最佳催化脱气条件下，熔融硫中硫化氢的残留含量分别为 1.51（催化剂中氧化铁的重量百分比）、245（时间，分钟）和 12.850（重量）在 1 kg 硫中加入的催化剂，g)。在这些条件下，通过使用氧化铈/纳米二氧化硅和氧化钼/纳米二氧化硅催化剂，熔融硫中硫化氢的残余含量也分别为约54ppmw和47ppmw。结果表明，向氧化铈/纳米二氧化硅和氧化钼/纳米二氧化硅催化剂中添加氧化铁改善了它们的催化行为，并将熔融硫中的残余硫化氢含量分别降低至约 25ppmw 和 35ppmw。对催化剂进行了表征分析，包括 AAS、FESEM、EDS 和 BET。结果表明，向氧化铈/纳米二氧化硅和氧化钼/纳米二氧化硅催化剂中添加氧化铁改善了它们的催化行为，并将熔融硫中的残余硫化氢含量分别降低至约 25ppmw 和 35ppmw。对催化剂进行了表征分析，包括 AAS、FESEM、EDS 和 BET。结果表明，向氧化铈/纳米二氧化硅和氧化钼/纳米二氧化硅催化剂中添加氧化铁改善了它们的催化行为，并将熔融硫中的残余硫化氢含量分别降低至约 25ppmw 和 35ppmw。对催化剂进行了表征分析，包括 AAS、FESEM、EDS 和 BET。