Characterization and Catalytic Properties of the Ni/Al2O3 Catalysts for Aqueous-phase Reforming of Glucose

Abstract

Two Ni/Al 2 O 3 catalysts with high Ni loadings of 36 wt% and 48 wt%, which possess high activities for aqueous-phase reforming of glucose, have been successfully prepared by a novel two-step impregnation method. The catalytic performance was investigated at 533 K and autogenous pressure in a batch reactor and a significant enhancement in hydrogen yield was observed over the catalyst prepared by two-step impregnation as compared to the corresponding catalyst prepared by conventional single impregnation. The catalysts were characterized by XRD, N 2 adsorption/desorption, H 2 chemisorption, O 2 uptake, TPO, H 2 -TPR and TEM. It was found that two-step impregnation yielded catalysts with higher nickel dispersion as well as smaller nickel particle size compared to single impregnation.

Hydrogen production via the aqueous phase reforming of ethylene glycol over platinum-supported ordered mesoporous carbon catalysts: Effect of structure and framework-configuration

“…This indicates that highly dispersed Ni metal particles formed on the OMC supports. However, after the hydrothermal treatment, distinct XRD peaks appeared around 2 theta ¼ 44 and 52 , corresponding to the (111) and (200) diffraction of the polycrystalline Ni metal, respectively [30]. As in the results of the Pt/OMC case, the aggregation of Ni metal nanoparticles was retarded by the 3-D pore structure of the OMC and by the large surface area caused by the hollow-type framework.…”

Production of bio-hydrogen by liquid processing of xylitol on Pt/Al2O3 catalysts: Effect of the metal loading

“…The APR of polyols to produce hydrogen was initially studied using shorter substrates such as ethylene glycol and glycerol [4e8]. Then, several papers have investigated the APR of larger substrates such as glucose [9,10] and sorbitol [11e15], a sugar alcohol obtained by hydrogenation of glucose. Recently, the APR of xylitol, a fivecarbon sugar alcohol derived from xylose hydrogenation, has been studied [16e20].…”

Hydrogenation of Liquid Styrene by Alumina Supported Nickel Catalysts: Comparison between Classical and Non-Classical Methods

“…It can be seen that the 13.8wt% Ni-Al 2 O 3 /C exhibits a strong peak at 400 K. According to Kim and co-workers [14], this peak can be attributed to bulk oxides which do not interact with the support. The availability of higher Ni content in this catalyst enabled the growth of the particles, which increased the size of particles [14,15]. This can result in a weaker interaction between the oxide particles with the support.…”