摘要
用ＴＰＲ和ＸＰＳ对ＺｎＯ负载ＮｉＣｕ双金属催化剂中Ｎｉ与Ｃｕ的相互作用进行了研究，ＴＰＲ结果表明，ＮｉＣｕ双金属催化剂中，Ｃｕ在低温下还原，而Ｎｉ在高温下还原，还原的Ｃｕ能促进Ｎｉ的还原，还原后Ｎｉ与Ｃｕ形成了ＮｉＣｕ合金。揭示了ＮｉＣｕ合金中Ｎｉ与Ｃｕ的结合强度与组成有关，Ｃｕ／Ｎｉ比越高，Ｎｉ与Ｃｕ的结合强度越高。ＸＰＳ的结果进一步表明，ＮｉＣｕ合金中，Ｃｕ在表面上有一定程度的富集。
ZnOsupported NiCu bimetallic catalysts were prepared by coprecipitation method and studied by TPR and XPS TPR results showed that copper in the NiCu bimetallic catalysts can be reduced at low temperature with Tmax around 493K, while pure nickel supported on ZnO can be reduced at higher temperature with Tmax=629K The presence of Cu promoted the reduction of Ni, and NiCu bimetallic alloy was formed after reduction Treating the catalysts in air at progressively higher temperatures after reduction, and then running TPR again revealed that the binding strength between Ni and Cu in the alloy depended on the Cu/Ni ratios, and the higher the Cu/Ni ratio, the stronger the binding strength XPS results further showed that Cu was enriched on the surface of the NiCu bimetallic alloy to a certain extent The present study also demonstrated that TPR is a very useful technique in the study of alloy catalysts
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1998年第3期215-219,共5页
Journal of Fuel Chemistry and Technology
