高校化学工程学报Issue(2)：442-450,9.DOI:10.3969/j.issn.1003-9015.2015.02.031
沼气中羰基硫的深度脱除
Deep Removal of Carbonyl Sulfide in Biogas
摘要
Abstract
For a distributed FC power station using biogas as the resource to produce hydrogen, deep desulfurization of biogas is important. ZnO/γ-Al 2O3, CuO/γ-Al2O3 and Cu/γ-Al2O3 were prepared via impregnation and deep removal of carbonyl sulfide (COS) from biogas with the above metal oxides were studied. At the same time, the commercial Fe2O3 desulfurizer was used as a reference. The results show that Cu-based desulfurizers are better than ZnO/γ-Al2O3 and Fe2O3 in desulfurization. Cu-based desulfurizers decrease COS to less than 10 ppb at 250~400℃, which meets the desulphurization requirement for distributed PEMFC power station and can achieve the goal of complete desulfurization within the feed preheating section of biogas reformer. CuO/γ-Al2O3 has the highest sulfur capacity of 0.185 mmol⋅g−1 at 250℃. Mechanism of COS removal with CuO/γ-Al2O3 was investigated. The presence of CuS in solid product indicates that the adsorption of COS on CuO/γ-Al2O3 is via chemical adsorption. The existence of Cu2O and Cu means that CH4 and CO2 reacts at above 250℃, as Cu2O and Cu are the reduction products of H2 and CO which are generated in the reforming reaction. H2 S is detected in the gas product, which may be generated by the hydrogenation reaction of COS. In addition, moisture in biogas has an adverse effect on the desulfurization performance of Cu-based desulfurizers, which can be depressed by increasing temperature.关键词
沼气/羰基硫/金属氧化物/深度脱硫/质子交换膜燃料电池Key words
biogas/carbonyl sulfide/metal oxide/deep desulfurization/PEMFC分类
农业科技引用本文复制引用
龚娟,焦以飞,苏庆泉,米万良..沼气中羰基硫的深度脱除[J].高校化学工程学报,2015,(2):442-450,9.基金项目
国家自然科学基金(20776016)；国家自然科学基金(21006005)。 （20776016）
