Sub‐5 nm Intermetallic Nanoparticles Confined in Mesoporous Silica Wells for Selective Hydrogenation of Acetylene to Ethylene,ChemCatChem

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Sub‐5 nm Intermetallic Nanoparticles Confined in Mesoporous Silica Wells for Selective Hydrogenation of Acetylene to Ethylene
ChemCatChem ( IF 3.8 ) Pub Date : 2020-03-17 , DOI: 10.1002/cctc.202000155
Raghu V. Maligal‐Ganesh ₁ , Yuchen Pei ₁ , Chaoxian Xiao ₁ , Minda Chen _{1,

2} , Tian Wei Goh ₁ , Weijun Sun ₁ , Jiashu Wu ₁ , Wenyu Huang _{1,

2}

Affiliation

We report the synthesis and catalytic application of intermetallic PtSn nanoparticles confined in MSWs (Mesoporous Silica Wells) in the semi‐hydrogenation of acetylene. Platinum nanoparticles with a size of 2.9 nm supported on amine‐functionalized ∼180 nm silica spheres were enmeshed in a mesoporous silica shell. After the addition of tin via a polyol synthesis method, we obtained the final PtSn_x@MSW (x=0.30, 0.50, 0.70, 1.0 and 2.0). Owing to the mesoporous encapsulation the sub‐5 nm bimetallic particles are shown to be monodisperse and well protected against aggregation on the silica sphere even under high‐temperature treatment conditions. In the gas phase semi‐hydrogenation of acetylene, the PtSn@MSW with Sn/Pt molar ratios equal to or greater than one displayed higher selectivity to ethylene. Meanwhile, increasing Sn content decreases acetylene conversion. The intermetallic PtSn@MSW catalysts also displayed long‐term stability and regenerability due to the confined environment provided by MSW.

中文翻译：

局限在介孔二氧化硅孔中的亚5纳米金属间纳米粒子，用于乙炔选择性加氢成乙烯

我们报告了在乙炔的半加氢过程中，金属离子间的PtSn纳米粒子在MSW（中孔二氧化硅井）中的合成和催化应用。负载在胺官能化的〜180 nm二氧化硅球上的2.9 nm大小的铂纳米粒子嵌入了介孔二氧化硅壳中。通过多元醇合成方法添加锡后，我们获得了最终的PtSn _x@MSW（x = 0.30、0.50、0.70、1.0和2.0）。由于具有中孔封装，因此即使在高温处理条件下，亚5 nm双金属颗粒仍表现出单分散性，并得到了良好的保护，可防止其在二氧化硅球上聚集。在乙炔的气相半氢化反应中，Sn / Pt摩尔比等于或大于1的PtSn @ MSW对乙烯的选择性更高。同时，增加Sn含量降低了乙炔转化率。由于MSW提供的密闭环境，金属间PtSn @ MSW催化剂也显示出长期稳定性和可再生性。

更新日期：2020-03-17

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