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首页> 外文期刊>Applied Surface Science >Tailored Brønsted and Lewis surface acid sites of the phosphotungstic Wells Dawson heteropoly-acid
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Tailored Brønsted and Lewis surface acid sites of the phosphotungstic Wells Dawson heteropoly-acid

机译：磷钨韦尔斯道森杂多酸的量身定制的Brønsted和Lewis表面酸位

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摘要

The synthesis of transition metals Wells Dawson heteropoly salts along with their elemental composition, water content, structure and specific surface area were thoroughly investigated. Additionally, the use of a molecular probe such as pyridine allowed the quantification of Lewis and Bronsted surface acid sites. The transition metals counter-cations provide both Lewis and Bronsted acid sites. The concentration of Bronsted acid sites is influenced by the crystallization water associated with the heteropoly anion.Additionally, the dispersion of the phosphotungstic Wells Dawson heteropolyacid over transition metal oxides evidenced the presence of both Bronsted and Lewis surface acid sites. The concentration of these sites is related to the surface dispersion of the crystals of the HPA over the oxide supports and the degree of hydration of the HPA.
机译：彻底研究了过渡金属Wells Dawson杂多盐的合成及其元素组成，水含量，结构和比表面积。另外，使用诸如吡啶的分子探针允许定量路易斯和布朗斯台德表面酸位。过渡金属抗衡阳离子同时提供路易斯酸和布朗斯台德酸位。布朗斯台德酸位点的浓度受与杂多阴离子缔合的结晶水的影响。此外，磷钨的Wells Dawson杂多酸在过渡金属氧化物上的分散证明了布朗斯台德和路易斯表面酸位均存在。这些位点的浓度与HPA的晶体在氧化物载体上的表面分散性和HPA的水合度有关。

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