Hydrogen production by methanol steam reforming on NiSn/MgO–Al2O3 catalysts: The role of MgO addition

Abstract

The effect of the magnesia loading on the surface structure and catalytic properties of NiSn/MgO-Al2O3 catalysts for hydrogen production by methanol steam reforming has been investigated. The catalysts have been obtained by impregnation of γ-Al2O3 by the incipient wetness method, with variation of the MgO content. X-ray diffraction (XRD), BET surface area and H2-temperature programmed reduction (TPR) have been used to characterise the prepared catalysts. From this, it has been concluded that the incorporation of MgO results in the formation of MgAl2O4 spinel, which modifies the acid-base properties of the catalysts. The formation of Ni-Sn alloys after the reductive pre-treatment has also been evidenced.The influence of the temperature of reaction and of the MgO loading on the hydrogen production by reforming of methanol has been established. Moreover, tests of catalytic stability have been carried out for more than 20 h. The carbonaceous deposits have been examined by temperature-programmed oxidation (TPO). The analysis of the catalysts after reaction has confirmed the low level of carbon formation on these catalysts. In no case, carbon nanotubes have been detected on the solids.

Influence of PVP in magnetic properties of NiSn nanoparticles prepared by polyol method

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H 2 S effect on dry reforming of biogas for syngas production

“…The spinel crystalline peaks overlap with those of γ‐Al 2 O 3 at 37.5°, 45.8°, and 66.8°, respectively. As pointed out by Penkova et al, the Ni load is critical to fully form spinels. In our case, 10 wt% Ni is not enough to transform all of the γ‐Al 2 O 3 into NiAl 2 O 4 , in which the required Ni load is around 33 wt%.…”

Monitoring the Reaction Mechanism in Model Biogas Reforming by In Situ Transient and Steady‐State DRIFTS Measurements

“…For synthesis of the support, γ‐alumina (Spheralite SCS505) sieved between 100 and 200 μm was impregnated with an alcoholic solution of Mg(NO 3 ) 2 ⋅ 6 H 2 O (28 wt % of MgO). Notably, the theoretical amount of MgO required to completely transform alumina into the “ideal” spinel phase is approximately 28 wt % . Next, the solid was dried at 100 °C overnight and then calcined in air at 900 °C for 24 h. Regarding impregnation of the active phase, an aqueous solution of Rh(NO 3 ) 3 ⋅ 2 H 2 O was impregnated over the support, and it was dried and calcined in air at 500 °C for 8 h (2 °C min −1 ).…”