Glycerol steam reforming over calcium deficient hydroxyapatite supported nickel catalysts

Abstract

This paper presents reports on the glycerol steam reforming reaction. The studies were performed over four nickel catalysts with different metal loading (up to 10 wt%) supported on calcium deficient hydroxyapatite (DHAp). The support was synthetized by the microwave assisted hydrothermal method. The steam reforming reaction was performed under atmospheric pressure in the 650-800°C temperature range using 10 mg of catalyst sample and a glycerol/water mixture with S/C = 3. All catalysts were well characterized by physicochemical methods (XRD, XRF, TPR, HRTEM). The catalytic tests results were presented by means of glycerol conversion, hydrogen and carbon containing gases selectivity. The most promising results were obtained for catalyst with moderate Ni content (*7.5 wt%), which proved to be stable during a few hours on-stream and provided glycerol conversion at least 94% at reaction temperature above 750°C.

The influence of alkaline promoters on the properties of the Ni/HAp catalyst in the methane dry reforming reaction

“…Peak maxima marked as 486 and 622 o C corresponds mainly to the reduction of Ni 2+ ions incorporated in the Ca(I) and Ca(II) sites of HAp which is often described as SMSI phenomena (Strong Metal-Support Interaction). Detailed information about Ni/HAp reduction profiles can be found in authors previous work (Cichy et al, 2017).…”

“…Decreasing the Ca/P ratio leads to an increase in HAp's surface acidity (Joris and Amberg, 1971). The potential catalytic properties of calcium hydroxyapatite have been recorded across various applications, including the elimination of oxygenated volatile organic compounds (Aellach et al, 2010), oxidative coupling of methane (Park et al, 2012), and glycerol steam reforming (Dobosz et al, 2018;Cichy et al, 2017). Additionally, hydroxyapatite has proven successful as a support for Co (Tran et al, 2020) and Ni (Wang et al, 2023;Phan and Minh, 2023;de Vasconelos et al, 2020) active sites in DRM reaction.…”