在甲烷部分氧化制合成气中Pt-Ni/Al_2O_3催化剂中的Pt-Ni协同作用机理(英文)

甲烷部分氧化制合成气的研究是在Ｎｉ／Ａｌ２Ｏ３催化剂上进行的。结果表明，添加少量的Ｐｔ可显著提高甲烷转化率和ＣＯ选择性并增加Ｎｉ／Ａｌ２Ｏ３催化剂的稳定性。通过ＸＲＤ、ＸＰＳ、ＴＰＲ和ＴＰＤ等表征手段发现，Ｐｔ－Ｎｉ／Ａｌ２Ｏ３催化剂中形成了Ｐｔ－Ｎｉ合金，Ｐｔ在催化剂表面富集。分析ＴＰＲ和ＴＰＤ数据可知，Ｐｔ－Ｎｉ双金属的相互作用阻止了催化剂的烧结和Ｎｉ的流失，提高了催化剂的活性。另外，Ｐｔ－Ｎｉ的协同作用也抑制了催化剂表面积炭的产生。

SYNERGISM IN PLATINUM ENHANCED NICKEL CATALYSTS FOR OXIDATION OF METHANE TO SYNGAS

The syngas production from partial oxidation of methane was investigated over a series of Pt promoted nickel catalysts. It was shown that the addition of small amounts of platinum could increase significantly the methane conversion and CO selectivity,and could also enhance the stability of Ni/AI2O3 catalyst. The catalysts were characterized by means of XRD, XPS, TPR and TPD techniques. The results showed the formation of Pt-Ni alloy in the samples and the enrichment of Pt on the surface of catalysts. The TPR and TPD results indicated clearly the Pt-Ni bimetallic interaction, which could prevent the sintering and nickel loss of the catalyst, and thus improve the catalytic performances.Carbon deposition over the Pt-Ni/Al2O3 catalyst was also suppressed due to the synergic interaction of Pt and Ni.