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利用正交分析,通过溶胶凝胶-超临界干燥及复合浸渍的方法制备了NiO SnO2 ZrO2催化剂,进行了活性评价,考察了前驱物、NiO、SnO2含量及制备方法对催化剂活性及稳定性的影响,并采用XRD、TEM对催化剂进行了表征分析,结果表明:NiO SnO2 ZrO2催化剂具有良好的甲烷燃烧催化性能(t100%=640℃),其活性、稳定性与制备参数密切相关,其中NiO含量是影响催化剂活性、稳定性的最主要参数,它对催化剂稳定性和活性的影响规律正相反;SnO2组分的添加使ZrO2单斜相稳定,对催化剂起到了良好的稳定化作用,发现当SnO2含量在6mol%左右时,催化剂具有较好的稳定性;对于制备方法,在凝胶前加入活性组分有利于催化剂的高活性,而在凝胶后加入活性组分,则有利于催化剂保持较好的稳定性;活性组分前驱物对催化剂性能影响不大,采用Ni(NO3)2作为前驱物较为合适。
NiO SnO2 ZrO2 catalysts were prepared by sol-gel-supercritical drying and composite impregnation method. The effects of the precursors, NiO and SnO2 content and the preparation methods on the catalytic activity and stability were investigated , And characterized by XRD and TEM. The results show that NiO SnO2 ZrO2 catalyst has good methane combustion catalytic performance (t100% = 640 ℃), its activity and stability are closely related to the preparation parameters, NiO content is The most important parameter influencing the activity and stability of the catalyst is its opposite effect on the stability and activity of the catalyst. The addition of the SnO2 component stabilizes the monoclinic phase of ZrO2 and stabilizes the catalyst. It is found that when the SnO2 content At about 6 mol%, the catalyst has good stability. For the preparation method, adding the active component before the gel is favorable for the high activity of the catalyst, and adding the active component after the gel is favorable for the catalyst to keep better The precursor of the active component has little effect on the catalyst performance, and it is more suitable to use Ni (NO3) 2 as a precursor.