Sorption enhanced steam reforming of ethanol on Ni-CaO-Al2O3 multifunctional catalysts derived from hydrotalcite-like compounds

This paper describes the sorption of carbon dioxide for enhanced steam reforming of ethanol to produce hydrogen via Ni-CaO-Al2O3 multifunctional catalysts derived from hydrotalcite-like compounds (HTlcs). The catalysts were characterized by N-2 adsorption-desorption, X-ray powder diffraction (XRD), transmission electron microscopy (TEM), H-2 temperature-programmed reduction (H-2-TPR) and thermogravimetric analysis (TGA) and tested in sorption enhanced steam reforming of ethanol (SESRE), in which products were monitored by an online mass spectrometer (MS). The Ni-CaO-Al2O3 catalysts possess uniform distribution of Ni, Ca and Al, contributing significantly to the excellent CO2 adsorbent capacity and reforming activity in SESRE. We have also examined the effect of Ca/Al ratios on Ni dispersion, CaO particle size, and catalytic reactivity; a Ca/Al of 3.0 was optimized. The Ni-CaO-Al2O3 catalysts outperform the conventional mixture of CaO adsorbents and Ni/Al2O3 catalysts for SESRE.