A dual‐templating method was used to synthesize a series of hierarchical carbon supports containing different proportions of spherical macropores (ca. 200 nm in diameter) and mesoporous channels (ca. 4 nm in diameter). These and some other conventional carbon materials were subsequently impregnated with Ni and tested for the conversion of glycerol. The hierarchical catalysts exhibited a significantly higher conversion (96%) and selectivity (77%) to 1,2‐propanediol, and the specificity selectivity coefficient (6.1) towards 1,2‐propanediol against lactic acid was three times higher than that observed over a conventional Ni/C_micro catalyst (2.1). The enhanced performance of these materials, compared with the Ni nanoparticles supported on conventional carbon supports, was attributed to their high surface areas (> 1110 m²∙g⁻¹) and large pore volumes (ca. 0.4 cm³∙g⁻¹) permitting greater accessibility of substrate and/or intermediates to Ni active sites. Given that the concentration of accessible Ni sites in these materials is higher, a competitive benzilic‐acid‐rearrangement reaction to produce lactic acid was suppressed, leading to an enhanced hydrogenation selectivity to 1,2‐propanediol. This study evidences the potential benefits, which can be established from utilizing hierarchical support materials in the valorization of biomass.

中文翻译：

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多孔碳包封的镍纳米粒子可促进甘油对氢的价衡作用，从而防止重排†

使用双模板方法合成了一系列分层的碳载体，其中包含不同比例的球形大孔（直径约200 nm）和中孔通道（直径约4 nm）。随后将这些和一些其他常规碳材料用Ni浸渍，并测试甘油的转化率。分级催化剂对1,2-丙二醇的转化率（96％）和选择性（77％）明显更高，对1,2-丙二醇对乳酸的特异性选择性系数（6.1）比在1,2-丙二醇中高出三倍。常规的Ni / C_微型催化剂（2.1）。与负载在传统碳载体上的镍纳米颗粒相比，这些材料的性能增强归因于它们的高表面积（> 1110 m ² ∙g ^-1）和大孔体积（约0.4 cm ³ ∙g ^-1）使底物和/或中间体更容易接近Ni活性位点。由于这些材料中可及的Ni位置的浓度较高，因此抑制了竞争性苯甲酸-酸重排反应生产乳酸，从而提高了对1,2-丙二醇的氢化选择性。这项研究证明了潜在的好处，这可以通过在生物质的增值中利用分层的支持材料来确立。