Influence of the swelling agents of siliceous mesocellular foams on the performances of Ni-based methane dry reforming catalysts

Investigation of new routes for the preparation of mesoporous calcium oxide supported nickel materials used as catalysts for the methane dry reforming reaction

“…Catalytic performances were measured after reduction of the prepared materials, using a Microactivity catalytic reactor (MAR from PID ENG & TECH Spain) and applying reaction conditions chosen from our previous works. [10][11][12][13] 100 mg of each calcined sample was loaded between 2 layers of quartz wool in the reactor. A leak test was first accomplished in the presence of an inert gas (argon), then reduction of the sample was operated at atmospheric pressure under flowing 5%H 2 /Ar (30 mL min -1 ) and increasing the temperature from room temperature up to 700 °C and keeping this temperature for 2 h to ensure full nickel oxide reduction into Ni 0 .…”

“…As well established in the literature, deactivation can be prevented by (i) synthesizing very small and well dispersed metallic active sites, (ii) establishing a strong metal-support interaction and (iii) introducing an element with a high capability of carbon removal. [8][9][10][11][12][13][14][15] To this respect, using alkaline earth metal oxides as catalytic supports in DRM allows to benefit from their high oxygen storage capacities. Hence, such basic oxides are able to decrease carbon buildup on active metal surface by providing kinetically larger concentration of labile oxygen that is known to contribute to the removal of carbonaceous deposits by initiating their oxidation.…”

Ni-Silica-based Catalysts for CH4 Reforming by CO2 with Enhanced Stability: Recent Designs and the Impacts of Ni Confinement, Promoters, and Core-Shell Structures

“…Therefore, Dry Reforming of Methane (Equation 2, with CO 2 ), which produces the lowest H 2 :CO ratio, appears to be a more convenient and direct approach. Besides the economic and energy benefits, DRM provides an important added advantage of environmental protection as it consumes another greenhouse gas, i.e., carbon dioxide [7][8][9][10][11][12][13][14][15][16][17][18].…”

“…Unfortunately, DRM is a highly endothermic reaction requiring high temperatures to reach the desired conversion levels. According to thermodynamic simulations, the maximal CH 4 conversion possible at 650 °C is approximately 80%, and a total conversion can be achieved only when the reaction temperature exceeds 800 °C [12,16]. A major objective of the research works conducted on dry methane reforming is the development of stable catalysts that enable achieving high conversion rates at the mildest possible operating conditions and allow, under the stream, a constant selectivity in CO and H 2 .…”

Aqueous nickel(II) hydroxycarbonate instead of nickel(0) colloids as precursors of stable Ni-silica based catalysts for the dry reforming of methane

“…It is noteworthy that nickel in both NiII aq.coll/S and Ni II org.coll(5)/S samples need higher temperatures (superior to 650 °C) to be totally reduced which implies a better metal-support interaction and relatively small mean particle sizes. The reduction of nickel in Ni II aq.coll/S was even a little bit more difficult due to the presence of Ni phyllosilicates on the starting material[26][27][28][29].The Ni wt. % estimated from the H2 consumption during the TPR could be estimated to 5.5, 3.1 and 2.8 for Ni II /S, Ni II aq.coll/S and Ni II org.coll(5)/S, respectively.…”