Abstract
Zinc–aluminum layered double hydroxides (Zn–Al LDHs) with different Zn/Al ratios (Zn/Al=6, 3 and 2) were prepared using a homogenous precipitation method by urea hydrolysis. The preparation was performed at various temperatures (70–100°C). The element chemical analysis, X-ray powder diffraction and Fourier transform infrared spectra show that urea species and cyanate anions are the main anions intercalated at low temperature and low Zn/Al ratios. This was confirmed by pH curves recorded during the reaction, thermal analyses, temperature programmed desorption.The presence of intercalated urea and cyanate species creates UV absorption activities for the ZA15-80 and ZA35-80 samples and enhance the selectivity of ZA15-80 toward the adsorption of carbon dioxide from natural gas.
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