Effects of surface features on sulfur dioxide adsorption on calcined NiAl hydrotalcite-like compounds

Ling Zhao, Xinyong Li, Xie Quan, Guohua Chen

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40 Citations (Scopus)

Abstract

The hydrotalcite-based NiAl mixed oxides were synthesized by coprecipitation and urea hydrolysis approaches and employed for SO2removal. The samples were well characterized by inductively coupled plasma (ICP) elemental analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and N2adsorption/desorption isotherm analyses. The acid-base properties were characterized by pyridine chemisorption and CO2temperature- programmed desorption (TPD). The calcined NiAlO from the urea method showed excellent SO2adsorption and its adsorption equilibrium showed a type I isotherm, which significantly improved the adsorption performance for low-concentration SO2. Both the physical structure and the acidic-basic sites were found to play important roles in the SO2adsorption process. In situ Fourier transform infrared spectroscopy (FTIR) investigation revealed that adsorbed SO2molecules formed surface bisulfite, sulfite, and bidentate binuclear sulfate. The mechanisms for SO2adsorption and transformation are discussed in detail.
Original languageEnglish
Pages (from-to)5373-5379
Number of pages7
JournalEnvironmental Science and Technology
Volume45
Issue number12
DOIs
Publication statusPublished - 15 Jun 2011
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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