Platinum Nanoparticles Supported on Hierarchically Porous Aluminosilicate Nanospheres for Low-Temperature Catalytic Combustion of Volatile Organic Compounds,ACS Applied Nano Materials

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Platinum Nanoparticles Supported on Hierarchically Porous Aluminosilicate Nanospheres for Low-Temperature Catalytic Combustion of Volatile Organic Compounds
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-08-03 , DOI: 10.1021/acsanm.0c02001
Yu Hao ₁ , Shaohua Chen ₁ , Huan Wang ₁ , Rui Chen ₁ , Pingchuan Sun ₂ , Tiehong Chen ₁

Affiliation

The hierarchically porous silica (NKM-5) and aluminosilicate (Al-NKM-5) supported platinum nanoparticles catalysts were prepared and investigated for the catalytic combustion of toluene and ethanol. The Pt/NKM-5 and Pt/Al-NKM-5 catalysts displayed the submicrometer spherical morphology and the hierarchical pore structure, and the Pt nanoparticles were uniformly distributed. The Pt/NKM-5 and Pt/Al-NKM-5 showed excellent low-temperature catalytic activity and CO₂ selectivity, and the hierarchical pores were beneficial to the catalytic combustion of toluene. With the increase of Al content, the catalytic activity of Pt/Al-NKM-5 increased gradually; the Pt/Al-NKM-5-5 catalyst with Si/Al = 5 showed the most excellent catalytic activity with 90% toluene conversion at 146 °C and 90% ethanol conversion at 138 °C. The NMR and NH₃-TPD showed that the incorporation of Al could increase the acidity of support, which could promote the distribution of Pt and the adsorption of toluene as characterized by UV–vis, TEM, CO pulse chemisorption, and FTIR. The excellent catalytic activity of Pt/Al-NKM-5-5 could be ascribed to the hierarchically porous structure, more acidic sites, and higher Pt dispersity.

中文翻译：

分层多孔铝硅酸盐纳米球上负载的铂纳米颗粒用于挥发性有机化合物的低温催化燃烧

制备了分级多孔二氧化硅（NKM-5）和铝硅酸盐（Al-NKM-5）负载的铂纳米粒子催化剂，并研究了甲苯和乙醇的催化燃烧。Pt / NKM-5和Pt / Al-NKM-5催化剂表现出亚微米级的球形形态和分级的孔结构，并且Pt纳米粒子均匀分布。Pt / NKM-5和Pt / Al-NKM-5表现出优异的低温催化活性和CO ₂选择性和层状孔有利于甲苯的催化燃烧。随着Al含量的增加，Pt / Al-NKM-5的催化活性逐渐增加。Si / Al = 5的Pt / Al-NKM-5-5催化剂表现出最优异的催化活性，在146°C时甲苯转化率为90％，在138°C时乙醇转化率为90％。NMR和NH ₃ -TPD表明，Al的掺入可以提高载体的酸度，这可以通过紫外可见，TEM，CO脉冲化学吸附和FTIR表征来促进Pt的分布和甲苯的吸附。Pt / Al-NKM-5-5的优异催化活性可以归因于分层多孔结构，更多的酸性位点和更高的Pt分散性。

更新日期：2020-08-28

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