Pt/MgO 催化剂上甲烷部分氧化制合成气反应

用浸渍法制备了Pt/MgO催化剂,并采用X射线衍射、X射线光电子能谱、透射电子显微镜和程序升温表面反应等技术对催化剂进行了表征.考察了催化剂对甲烷部分氧化制合成气反应的催化性能.结果表明,Pt/MgO催化剂具有较高的催化活性和选择性,甲烷转化率与合成气选择性在120 h内保持稳定.以金属状态存在的Pt对甲烷分解具有较高的活性,从而使催化剂对甲烷部分氧化反应具有较高的催化活性.活性组分Pt的存在状态和分散状态非常稳定,而Pt/MgO催化剂具有较强的抗积碳能力,使得催化剂在甲烷部分氧化制合成气反应中具有较高的稳定性.

Partial Oxidation of Methane to Syngas over Pt/MgO Catalyst

Pt/MgO catalyst samples with different Pt loading were prepared by wet impregnation.X-ray diffraction,X-ray photoelectron spectroscopy,transmission electron microcopy,and temperature-programmed surface reaction were used to characterize the catalyst samples.Partial oxidation of methane(POM) to syngas was performed in a fixed-bed microreactor.The results indicated that the Pt/MgO catalyst exhibited high activity and selectivity.The conversion of methane and selectivity for CO and H2 remained constant up to 120 h.The dispersed Pt existed in a metallic state,which was responsible for the high activity in the POM reaction.Both the state and the dispersion of active Pt were very stable,together with the high ability to resist carbon deposition,and therefore the catalyst showed high stability in the POM reaction.