A one-pot redox deposition method is described to prepare silica-supported bimetallic NiPt and CuPt catalysts using differences in standard reduction potentials. The synthesis involved the initial reduction of non-noble metal ions (Ni²⁺ and Cu²⁺) by NaBH₄, followed by reduction of Pt ions by these reduced metals. Alloy formation and phase purity were established by X-ray diffraction (XRD), bulk composition by X-ray fluorescence (XRF), and surface composition by X-ray photoelectron spectroscopy (XPS). Alloy formation was enhanced by increase in the amount of base metals available to reduce Pt, or through the use of excess NaBH₄ after redox deposition. The catalysts were evaluated for methane oxidation at 300-400 °C and atmospheric pressure. Reference samples prepared using the incipient wetness impregnation (IW) method had inferior performance and characteristics. The redox deposition method provides a simple and versatile protocol for the preparation of bimetallic alloys between noble metals and base metals.

描述了一种单锅氧化还原沉积方法，以利用标准还原电位的差异来制备二氧化硅负载的双金属NiPt和CuPt催化剂。合成过程包括通过NaBH ₄初始还原非贵金属离子（Ni ²⁺和Cu ²⁺），然后通过这些还原金属还原Pt离子。通过X射线衍射（XRD）确定合金形成和相纯度，通过X射线荧光（XRF）确定整体组成，并通过X射线光电子能谱（XPS）确定表面组成。通过增加可用于还原Pt的贱金属的量或通过使用过量的NaBH ₄来增强合金的形成氧化还原沉积后。在300-400℃和大气压下评估催化剂的甲烷氧化。使用初期湿润浸渍（IW）方法制备的参考样品的性能和特性均较差。氧化还原沉积方法为制备贵金属和贱金属之间的双金属合金提供了一种简单而通用的方案。