Abstract

Platinum catalysts supported onto bayerite alumina were synthesized and studied. Alumina of the θ-Al₂O₃ type, which was prepared from metallic aluminum by an aluminate method, was used as a support, and platinum(IV) nitrate and hydrogen hexachloroplatinate(IV) precursors containing Pt⁴⁺ ions were used for supporting an active component. The catalysts were studied by physicochemical methods such as X-ray phase analysis, X-ray photoelectron spectroscopy, transmission electron microscopy, and ultraviolet-visible diffuse reflection spectroscopy. It was found that platinum occurred in a finely dispersed state in both of the catalysts, and it was uniformly distributed over the support surface. The particle sizes were 2.8 and 0.9 nm in the samples synthesized from platinum(IV) nitrate and hydrogen hexachloroplatinate(IV), respectively. The most uniform surface distribution, high dispersity, and a narrow particle-size distribution were obtained with the use of hydrogen hexachloroplatinate(IV). The catalysts were tested in the partial oxidation of natural gas. The catalyst synthesized using platinum(IV) nitrate afforded an almost thermodynamically equilibrium distribution of the reaction products of partial oxidation at a temperature of 700–800°С.

中文翻译：

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制备方法对Bayerite氧化铝负载的铂催化剂对烃部分氧化反应的理化和催化性能的影响

摘要

合成并研究了负载在三水铝石上的铂催化剂。所述的氧化铝θ-Al系₂ ö ₃型，将其从金属铝通过铝酸盐方法制备，用作支撑体，和铂（IV）硝酸根和六氯铂酸含Pt（IV）的前体⁴⁺离子用于支撑活性成分。通过诸如X射线相分析，X射线光电子能谱，透射电子显微镜和紫外可见漫反射光谱的物理化学方法研究了催化剂。发现铂在两种催化剂中均以细分散状态存在，并且均匀地分布在载体表面上。由硝酸铂（IV）和六氯铂酸氢盐（IV）合成的样品的粒径分别为2.8和0.9 nm。使用六氯铂酸氢盐（IV）可获得最均匀的表面分布，高分散性和窄粒度分布。在天然气的部分氧化中测试了催化剂。