Two mesoporous nickel phyllosilicate (Ni-PS) samples with Ni/Si ratios of 0.3 and 1 were used to compare high-temperature hydrothermal stability. The Ni-PS structures have well-developed porosity and pore size distributions mainly ranging from 2 to 20 nm. To assess their hydrothermal resistance as a reusable heterogeneous catalyst in high-temperature reactions, the samples were exposed to 800 °C for 7 days using steam-supplied muffle furnaces. Three types of mesoporous silica samples (i.e. MCM-41, SBA-15, and mesoporous benzene-silica) and two zeolites (i.e. ZSM-5 and zeolite-Y) were compared under the same conditions. The hydrothermal resistance was primarily confirmed based on changes in pore size distribution and surface area through nitrogen-sorption isotherm analysis. The crystal structure and the binding energy of each sample were investigated by X-ray diffraction and X-ray photoelectron spectroscopy measurements. The Ni-PS structures displayed excellent stability (i.e. BET surface area retained over 77 % and 65 % after 1-d and 7-d treatment, respectively.) compared with other mesoporous samples, and even higher stability than zeolite Y. In addition, structural stability at pH = 10 is much higher than that of ZSM-5. This suggests that it could be used for various catalytic chemical reactions including hydrogenation and cracking processes because NiO and Ni nanoparticles are uniformly distributed on the surface, maintaining their particle shape even after a reduction process.

中文翻译：

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在高温水热和碱性条件下高度稳定的介孔镍页硅酸盐颗粒用于工业催化应用


使用 Ni/Si 比分别为 0.3 和 1 的两种介孔层状硅酸镍 (Ni-PS) 样品来比较高温水热稳定性。 Ni-PS 结构具有发达的孔隙率和孔径分布，主要范围为 2 至 20 nm。为了评估其作为高温反应中可重复使用的多相催化剂的耐水热性，使用蒸汽供应的马弗炉将样品暴露在 800°C 下 7 天。在相同条件下比较了三种介孔二氧化硅样品（即MCM-41、SBA-15和介孔苯二氧化硅）和两种沸石（即ZSM-5和沸石-Y）。水热阻力主要通过氮吸附等温线分析根据孔径分布和表面积的变化来确定。通过X射线衍射和X射线光电子能谱测量研究了每个样品的晶体结构和结合能。与其他介孔样品相比，Ni-PS 结构表现出优异的稳定性（即 BET 表面积在处理 1 天和 7 天后分别保留超过 77% 和 65%。），甚至比沸石 Y 更高的稳定性。 pH = 10 时的结构稳定性远高于 ZSM-5。这表明它可用于各种催化化学反应，包括氢化和裂化过程，因为 NiO 和 Ni 纳米颗粒均匀分布在表面上，即使在还原过程后也能保持其颗粒形状。