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Ultrasmall Particle Sizes of Walnut-Like Mesoporous Silica Nanospheres with Unique Large Pores and Tunable Acidity for Hydrogenating Reaction.
Small ( IF 13.0 ) Pub Date : 2020-06-22 , DOI: 10.1002/smll.202002091
Di Hu 1 , Huiping Li 1 , Jinlin Mei 1 , Cong Liu 1 , Qian Meng 1 , Chengkun Xiao 1 , Gang Wang 1 , Yu Shi 1 , Aijun Duan 1
Affiliation  

The large particle sizes, inert frameworks, and small pore sizes of mesoporous silica nanoparticles greatly restrict their application in the acidic catalysis. The research reports a simple and versatile approach to synthesize walnut‐like mesoporous silica nanospheres (WMSNs) with large tunable pores and small particle sizes by assembling with Beta seeds. The as‐synthesized Beta‐WMSNs composite materials possess ultrasmall particulate sizes (70 nm), large radial mesopores (≈30 nm), and excellent acidities (221.6 mmol g−1). Ni2P active phase is supported on the surface of Beta‐WMSNs composite materials, and it is found that the obtained composite spherical materials can reduce the Ni2P particle sizes from 8.4 to 4.8 nm with the increasing amount of Beta seeds, which can provide high accessibilities of reactants to the active sites. Furthermore, the unique large pores and ultrasmall particle sizes of Beta‐WMSNs samples facilitate the reduction of the diffusion resistance of reactants due to the short transporting length, thus the corresponding Ni2P/Beta‐WMSNs composite catalysts show the excellent hydrogenating activity compared to the pure Ni2P/WMSNs catalyst.

中文翻译:

具有小孔和可调节酸度的类似核桃的中孔二氧化硅纳米球的超小粒径,可用于氢化反应。

中孔二氧化硅纳米粒子的大粒径,惰性骨架和小孔径极大地限制了它们在酸性催化中的应用。该研究报告了一种简单而通用的方法,即通过与Beta种子组装来合成具有大的可调节孔和小粒径的核桃状中孔二氧化硅纳米球(WMSN)。合成后的Beta-WMSNs复合材料具有极小的颗粒尺寸(70 nm),较大的径向中孔(≈30nm)和极好的酸度(221.6 mmol g -1)。Ni 2 P活性相被负载在β-WMSNs复合材料的表面,发现所得的复合球形材料可以还原Ni 2随着Beta种子数量的增加,P粒径从8.4到4.8 nm,可以为反应物提供高活性位点。此外,由于传输长度短,Beta-WMSNs样品独特的大孔和超小粒径有助于降低其反应物的扩散阻力,因此与之相比,相应的Ni 2 P / Beta-WMSNs复合催化剂显示出优异的加氢活性。纯Ni 2 P / WMSNs催化剂。
更新日期:2020-07-24
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