Effect of MgO addition on the basicity of Ni/ZrO2 and on its catalytic activity in carbon dioxide reforming of methane

Recent Scientific Progress on Developing Supported Ni Catalysts for Dry (CO2) Reforming of Methane

“…In contrast, metal-oxide supports, such as MgO, La 2 O 3 with high basicity promote dissociative adsorption of CO 2 , which can result in the suppression of carbon formation by producing higher number of oxygen atoms near the catalytic active metal surface [26][27][28]30,50]. The DRM reaction proceeds via three major step reactions (CH 4 cracking, CO 2 dissociation, and oxidation of carbon species on Ni surface) over Ni particles supported either by acidic metal-oxide (e.g., SiO 2 ) or basic metal-oxides (e.g., MgO) are schematically described in Figure 3.…”

“…The formation of bimetallic states with noble-metals and other transition metal has been extensively studied [18][19][20]25], and it has also been demonstrated that catalytic performances of Ni catalysts are strongly related to the basicity of metal-oxide supports [26][27][28][29][30][31][32][33][34]. In addition, many scientific results indicate that coke formation on Ni catalysts is less favored when their size are in a nano meter scale [35][36][37][38].…”

Hydrogen Production by Ethanol Steam Reforming on Ni-Based Catalysts: Effect of the Support and of CaO and Au Doping

“…Each peak is representing a nickel species with different strengths of interaction with the support. 35,36 The higher the reduction temperature of a nickel species, the stronger the interaction with the support. In every case, the Ni is reduced at temperature lower than 500 °C, which is the reaction temperature for ESR.…”

Fuel reforming over Ni-based catalysts coupled with selective catalytic reduction of NOx

“…4 and Table 3. Over Ni/Al2O3, a strong interaction between Ni species and the support resulted in the formation of the NiAl2O4 spinel structure, reduction of which occurred at temperatures above 800 K, exhibiting a wide H2 consumption peak within the range 800-1120 K. During H2 reduction of Ni/ZrO2, two peaks emerged, centered at 598 and 703 K. The low-temperature peak could be assigned to the reduction of surface-dispersed NiO particles and the high-temperature peak to reduction of a NiO species weakly interacting with ZrO2 [49]. The H2 consumption of the above two peaks was 758 μmol/g, slightly lower than that required for complete reduction of NiO (845 μmol/g, hereafter denoted as the theoretical value), indicating a good dispersion of Ni species, which was confirmed by the XRD analysis.…”