Facile Fabrication of Small-Sized Palladium Nanoparticles in Nanoconfined Spaces for Low-Temperature CO Oxidation,Industrial & Engineering Chemistry Research

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Facile Fabrication of Small-Sized Palladium Nanoparticles in Nanoconfined Spaces for Low-Temperature CO Oxidation
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-10-14 , DOI: 10.1021/acs.iecr.0c01885
Li-Ying Shi _{1,

2} , Yu-Xia Li ₁ , Ding-Ming Xue ₁ , Ming-Qi Shao ₁ , Meng-Xuan Gu ₁ , Xiao-Qin Liu ₁ , Lin-Bing Sun ₁

Affiliation

Palladium (Pd)-containing catalysts have gained extensive attention because of their outstanding activity in various heterogeneous catalytic reactions. The activity of these catalysts highly correlates with the size of the Pd particles. Herein, nano-sized Pd particles were fabricated by utilizing the as-made SBA-15 (AS) possessing nanoconfined spaces between the template P123 and silica walls. By using the inherent nanoconfined spaces in AS, Pd nanoparticles with a smaller size can be generated conveniently (yielding Pd-AS); in contrast, Pd is apt to aggregate and form larger-sized particles in the conventionally calcined SBA-15 (CS) without nanoconfined spaces (yielding Pd-CS). The smaller size of Pd nanoparticles in Pd-AS endows the catalysts with better catalytic activity in CO oxidation compared to their Pd-CS counterparts. On the typical sample 5Pd-AS with 5 wt % of Pd, the turnover frequency at 140 °C is 1.55 min^–1, which is superior to its analogue 5Pd-CS (0.22 min^–1).

中文翻译：

在纳米密闭空间中用于低温CO氧化的小型钯纳米粒子的便捷制备

含钯（Pd）的催化剂因其在各种非均相催化反应中的出色活性而受到广泛关注。这些催化剂的活性与Pd颗粒的尺寸高度相关。在此，通过利用在模板P123和二氧化硅壁之间具有纳米约束空间的原样SBA-15（AS）来制造纳米级Pd颗粒。通过利用AS中固有的纳米约束空间，可以方便地生成较小尺寸的Pd纳米颗粒（产生Pd- AS）。相反，Pd易于在常规煅烧的SBA-15（CS）中聚集并形成较大尺寸的颗粒，而没有纳米密闭空间（产生Pd- CS）。与Pd - CS对应物相比，Pd- AS中较小的Pd纳米粒子尺寸使催化剂在CO氧化中具有更好的催化活性。在具有5 wt％Pd的典型样品5Pd- AS上，在140°C下的转换频率为1.55 min ^–1，优于其类似物5Pd- CS（0.22 min ^–1）。

更新日期：2020-10-29

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