Defects tune the acidic strength of amorphous aluminosilicates.

ABSTRACT: Crystalline zeolites have high acidity but limited utility due to microporosity, whereas mesoporous amorphous aluminosilicates offer better porosity but lack sufficient acidity. In this work, we investigated defect engineering to fine-tune the acidity of amorphous acidic aluminosilicates (AAS). Here we introduced oxygen vacancies in AAS to synthesize defective acidic aluminosilicates (D-AAS). ¹H, ²⁷Al, and ¹⁷O solid-state nuclear magnetic resonance (NMR) studies indicated that defects induced localized structural changes around the acidic sites, thereby modifying their acidity. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy studies substantiated that oxygen vacancies alter the chemical environment of Brønsted acidi

SUBMITTER: Verma R 

PROVIDER: S-EPMC11319355 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature