Surface acidity of tin dioxide nanomaterials revealed with 31P solid-state NMR spectroscopy and DFT calculations

被引：7

作者：

Zhang, Wenjing ^{[1
]}

Lin, Zhiye ^{[1
]}

Li, Hanxiao ^{[2
]}

Wang, Fang ^{[1
]}

Wen, Yujie ^{[1
]}

Xu, Meng ^{[1
]}

Wang, Yang ^{[1
]}

Ke, Xiaokang ^{[1
]}

Xia, Xifeng ^{[3
]}

Chen, Junchao ^{[1
]}

Peng, Luming ^{[1
]}

机构：

[1] Nanjing Univ, Key Lab Mesoscop Chem MOE, Collaborat Innovat Ctr Chem Life Sci, Sch Chem & Chem Engn, 163 Xianlin Rd, Nanjing 210023, Peoples R China

[2] Qingdao Univ Sci & Technol, Chinesisch Deutsch Tech Fak, 99 Songling Rd, Qingdao 266061, Peoples R China

[3] Nanjing Univ Sci & Technol, Anal & Testing Ctr, Nanjing 210094, Peoples R China

来源：

RSC ADVANCES | 2021年 / 11卷 / 40期

基金：

中国国家自然科学基金;

关键词：

SNO2; NANOSHEETS; CHEMICAL-SHIFTS; METAL-OXIDES; OXIDATION; CATALYSTS; PROGRESS; SUGARS; SITES;

D O I：

10.1039/d1ra02782d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Tin dioxide (SnO2) nanomaterials are important acid catalysts. It is therefore crucial to obtain details about the surface acidic properties in order to develop structure-property relationships. Herein, we apply P-31 solid-state NMR spectroscopy combined with a trimethylphosphine (TMP) probe molecule, to study the facet-dependent acidity of SnO2 nanosheets and nanoshuttles. With the help of density functional theory calculations, we show that the tin cations exposed on the surfaces are Lewis acid sites and their acid strengths rely on surface geometries. As a result, the (001), (101), (110), and (100) facets can be differentiated by the P-31 NMR shifts of adsorbed TMP molecules, and their fractions in different nanomaterials can be extracted according to deconvoluted P-31 NMR resonances. The results provide new insights on nanosized oxide acid catalysts.

引用

页码：25004 / 25009

页数：6

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