Magnesia-supported nickel catalysts I. Factors affecting the structure and morphological properties

High performance of Mg–La mixed oxides supported Ni catalysts for dry reforming of methane: The effect of crystal structure

“…The interaction between MgO and NiO may form a non-reducible basic solid-solution, Ni x Mg (1Àx) O [13], which not only increases CO 2 adsorption but also can control the Ni particle sizes [14], since only a small amount of NiO can be reduced and the nickel particles formed from the solid solution are often smaller than the critical size for coke formation [14]. In addition, Ni on reduced Ni/MgO catalysts is highly-dispersed and very stable against the particle sintering during the reaction due to the strong metalesupport interaction.…”

Deactivation Pattern of a “Model” Ni/MgO Catalyst in the Pre-Reforming of n-Hexane

“…with an ethanolic solution of the Ni(NO 3 ) 2 salt [28][29][30][31]. The catalyst was dried at 80 °C, calcined at 400 °C (16 h) and pre-reduced for 6 h at 650 °C under H 2 flow.…”

“…The Ni particle size distribution (PSD) was obtained from an average of 150-200 particles, and the average volume-area particle size calculated by the conventional statistical formula [29][30][31]:…”

“…The fraction of reduced Ni was evaluated by titration at 450 °C with O 2 pulses (Ni + ½ O 2  NiO) after TPD analysis [31]. TGA-DSC measurements of the "used" catalyst samples (5 mg) in the range of 20-400 °C were performed using a Simultaneous Thermal Analyser (STA 409C, Netzsch), operating in air with a heating rate of 10 °C/min and an accuracy of 0.01 mg. …”

“…Hindering the formation of the NiMgO x solid solution, indeed, such a preparation procedure allows tuning both physico-chemical and catalytic properties through a proper selection of Ni loading, calcination and reduction treatments [28,29,31].…”