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实验研究了水蒸气对低浓度甲烷在Cu/γ-Al_2O_3催化剂上燃烧特性的影响规律,考察了低浓度甲烷转化率随水蒸气浓度的变化规律、催化剂的耐水稳定性及再生特性,通过催化剂的微观结构观测探讨了水蒸气对低浓度甲烷催化燃烧的抑制机理。结果表明,随着水蒸气浓度的增加,催化剂的催化活性逐渐降低,空气吹扫可使催化剂活性部分恢复;水蒸气存在的情况下,催化剂表面存在烧结,但烧结的程度受到温度和蒸汽浓度两方面的作用。水蒸气抑制作用的原因是水分子吸附在催化剂表面,占据活性位,并生成表面羟基,阻碍甲烷与催化剂的接触。
The influence of water vapor on the combustion characteristics of low concentration methane over Cu / γ-Al 2 O 3 catalyst was investigated experimentally. The variation of low concentration methane conversion with water vapor concentration, the water stability and regeneration characteristics of the catalyst were investigated. The microstructure observation discussed the inhibition mechanism of water vapor on low concentration methane catalytic combustion. The results show that with the increase of water vapor concentration, the catalytic activity of the catalyst gradually decreases. The air purge can recover the active part of the catalyst. In the presence of water vapor, there is sintering on the surface of the catalyst, but the degree of sintering is affected by both the temperature and the vapor concentration. The role of. The reason for water vapor inhibition is that water molecules adsorb on the catalyst surface, occupy active sites and generate surface hydroxyl groups, hindering the contact of methane with the catalyst.