کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
150029 456442 2012 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Novel mesoporous silica supported ZnO adsorbents for the desulphurization of biogas at low temperatures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Novel mesoporous silica supported ZnO adsorbents for the desulphurization of biogas at low temperatures
چکیده انگلیسی

Biogas, a valuable renewable energy carrier, can be used as a fuel or as a raw material for the production of synthesis gas and hydrogen. However, the significant quantities of undesirable contaminants, especially hydrogen sulphide (H2S), constitute process problems and also generate harmful environmental emissions. The key objective of this work was to develop an adsorbent system for the H2S desulphurization of biogas at ambient temperature, which would be capable of reducing H2S to less than 1 ppmv in order to achieve high removal efficiency (>99%). The potential of MCM-41, KIT-6, SBA-15-Spherical type (SBA-15-S) and SBA-15-Fibre type (SBA-15-F) supported ZnO adsorbents has been explored at ambient temperature for H2S desulphurization in order to develop a more effective adsorbent for this important application. ZnO loadings of 10, 15 and 20 wt% were impregnated by the incipient wetness method to achieve mesoporous silica supported ZnO adsorbents. The adsorbents were characterized by N2 adsorption/desorption, using the BET method and the field emission scanning electron microscope (FESEM) technique, to investigate their various characteristics. 15 wt% ZnO supported on MCM-41/, KIT-6/, SBA-15-S/or SBA-5-F showed a higher adsorption capacity than 10 or 20 wt% ZnO loadings, this might be due to the smaller size of the ZnO particles in dispersed form with improved loading. However, the adsorption capacity decreased, at a higher loading of 20 wt% of ZnO, because of the increased particle size which is due to agglomerated dispersed form. The SBA-15-F and SBA-15-S supported ZnO showed better desulphurization performances than MCM-41, KIT-6 or the widely adopted commercial activated carbon material ROZ3 and commercial or synthesized titania supported ZnO adsorbents, due to their retained superior physical properties as well as to the size and dispersion of ZnO on the surface of these materials.


► Comparison of different mesoporous silica materials as support for ZnO adsorbents.
► Optimization of ZnO loading on mesoporous silica supports.
► High H2S adsorption capacity of ZnO (15 wt%)/SBA-15-F or SBA-15-S than others.
► Key role of physical properties of the supports, and size/dispersion of ZnO.
► Optimized promising adsorbent for biogas desulphurization at ambient temperature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 188, 15 April 2012, Pages 222–232
نویسندگان
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