摘要
通过改变反应体系中水蒸气浓度,考察了不同水蒸气浓度对γ-Al2O3负载的镍基催化剂上合成气制代用天然气(SNG)的反应活性和稳定性。采用X射线衍射、扫描电镜、N2吸附-脱附等技术对催化剂进行了表征。结果表明,催化剂的稳定时间与反应体系中水蒸气的浓度成反比。影响催化剂稳定性的主要因素可能是在高水蒸气浓度的合成气制SNG的反应条件中,γ-Al2O3的水合反应及其引起的γ-Al2O3相变。
Add nitrogen into reactor to change the concentration of water vapor in the reaction system. Catalytic behaviors of nickel-based catalysts with support (γ-Al2O3) for syngas methanation under different water vapor concentrations were investigated. The catalysts were characterized by X-ray diffraction, Scanning electron microscope, N2 adsorption-desorption. Characterization results showed that the main factor influencing the stability of catalyst might be γ-Al2O3 hydration. The stable time of the catalyst was inversely proportional with the concentration of water vapor of the system. γ-Al2O3 hydration phase transition led to the deactivation of the catalyst.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2013年第5期55-58,共4页
Natural Gas Chemical Industry