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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Beyond flower-like structure - The synergy within Pd/Ni-Al hydrotalcite for base-free oxidation of benzyl alcohols
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Beyond flower-like structure - The synergy within Pd/Ni-Al hydrotalcite for base-free oxidation of benzyl alcohols

机译：除了花状结构之外 - Pd / Ni-Al水滑石中的协同作用，用于苄醇的无基氧化氧化

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摘要

A highly efficient supported metal catalyst, Pd/Ni-Al hydrotalcite with flower-like structure was synthesized and applied for catalytic oxidation of benzyl alcohols; affording >99 % conversion and 94-100 % selectivity in a base-free solution. The surface basicity and cation-oxygen mode in the layer of hydrotalcite were found to be pronouncedly associated with the changes of morphologies of the Ni-Al hydrotalcites. Compared to negligible activity by Ni-Al hydrotalcite itself, low efficiency by Pd nanoparticles or its simple mixture with Ni-Al hydrotalcite, a significant enhancement in the catalytic activity by the Pd deposited on flower-like Ni-Al hydrotalcites suggested a synergistic effect occurred between Pd and well-structured Ni-Al hydrotalcite. A plausible mechanism for the catalytic reaction involving the formation of metal-alkoxide and metal-hydroperoxide intermediates was postulated based on the control reactions, FTIR and XPS analysis and Hammett experiment.
机译：合成了一种具有花状结构的高效负载型金属催化剂Pd/Ni-Al水滑石，并将其应用于苯甲醇的催化氧化；在无碱溶液中提供>99%的转化率和94-100%的选择性。发现水滑石层的表面碱度和阳离子氧模式与Ni-Al水滑石的形貌变化密切相关。与镍铝水滑石本身的活性可以忽略不计、钯纳米颗粒或其与镍铝水滑石的简单混合物的低效率相比，花状镍铝水滑石上沉积的钯显著提高了催化活性，表明钯和结构良好的镍铝水滑石之间存在协同效应。根据控制反应、FTIR和XPS分析以及Hammett实验，推测了金属醇盐和金属过氧化氢中间体形成的催化反应的可能机理。

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