Montmorillonite Supported Nickel Nanoparticles For Hydrogen Production From Glycerol Steam Reforming

Concerns about the depletion of fossil fuel reserves and the pollution caused by continuously increasing energy demands make alternative energy source attractive. Recently, the international researchers focus on hydrogen energy, treat it as an ideal energy for sustainable developmentMontmorillonite (MMT) supported nickel nanoparticles (Ni-MMT) with were prepared by an ultrasound assisted cation exchange impregnation method with rising pH technique at the calcination temperatures of 600,700 and 800?. The Ni-MMT catalysts were characterized by different techniques including thermogravimetry analysis (TGA), N2 adsorption-desorption, X-ray powder diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM), temperature programmed reduction (TPR), and temperature programmed oxidation (TPO). The characterization results show that the particle size, metal-support interaction, nickel dispersion interrelat with cation exchange capability and confinement effect of montmorillonite's lamellar structure. The activity and stability tests were conducted in a fixed bed reactor. The effect of Ni loadings and calcination temperature were investigated. The results show that the Ni dispersion, particle sizes of Ni and metal-support interaction (MSI) are closely dependent on the Ni loading and calcination temperature. The MMT support favor dehydrogenation reaction pathway which is effective to suppress the coke deposition and the lamellar structure could provide strong confinement effect which is effective to inhibit Ni sintering. Moreover the phyllosilicate content in MMT could promote WGS reaction which is conducive to produce hydrogen rich gas with low CO concentration. The H2 yield was close to the thermodynamic equilibrium values at 600?. The kinetic parameters such as the apparent activation energy and the frequency factor were calculated on the basis of assuming the power-law type general equation in the kinetics of GSR.At last, we investigated sorption enhanced steam reforming progress on CA-MMT, the results show that CA-MMT is an effective and stable catalyst.