کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6631251 | 1424941 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of preparation conditions on MnxOy/Al2O3 sorbent for H2S removal from high-temperature synthesis gas
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A series of MnxOy /Al2O3 sorbents with different tissue and chemical structures were prepared by repeated incipient wet impregnation method with different calcination conditions, including calcination temperature from 500â¯Â°C to 900â¯Â°C and calcination time from 3â¯h to 9â¯h. The H2S absorption performances of the prepared sorbents were investigated by a model synthesis gas containing 2000â¯mg/m3 H2S at 850â¯Â°C. The chemical and physical structures of the samples were characterized by Brunauer-Emmett-Teller, X-ray diffraction and scanning electron microscopy techniques to obtain fundamental information about the deactivation of MnxOy/Al2O3 sorbents during desulfurization-regeneration cycles. Results showed that the structural features of the sorbents at high reaction temperature played an important role in the stability of desulfurization performance. The analysis of the characteristics of the sorbents indicated that the sorbents obtained stabilized chemical and physical structures during desulfurization-regeneration cycles when the calcination temperature was 900â¯Â°C and the calcination time was above 6â¯h. The sorbent suffered serious deactivation during five successive desulfurization-regeneration cycles when the calcination temperature of sorbents was below 850â¯Â°C. The sulfur capacity decreasing of MnxOy/Al2O3 sorbents may probably be attributed to a part of MnxOy covered by Al2O3, which can un-sulfide during adsorption process. The coverage of active phase MnxOy may be caused by the shrinking and disappearing of some micropores, and phase transformation of Al2O3, as well as the transformation of MnAl2O4 lead to a part of MnxOy on the sorbents being covered by alumina.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 223, 1 July 2018, Pages 115-124
Journal: Fuel - Volume 223, 1 July 2018, Pages 115-124
نویسندگان
Haifeng Li, Sheng Su, Song Hu, Kai Xu, Long Jiang, Yi Wang, Jun Xu, Jun Xiang,