Importance of palladium dispersion in Pd/Al2O3 catalysts for complete oxidation of humid low-methane–air mixtures

Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

“…The NiO-Al 2 O 3 composite supports were prepared via a modified conventional method combined with co-precipitation and hydrothermal synthesis process, initialized with mixing aqueous solutions of Ni(NO 3 ) 2 and Al(NO 3 ) 3 . The mixed solutions of aluminum nitrate (0.2, 0.4 and 0.8 mol L −1 , respectively) and nickel nitrate (0.2 mol L −1 ), which were prepared dissolving Al(NO 3 ) 3 ·9H 2 O and Ni(NO 3 ) 2 ·6H 2 O in deionized water, was stirred for 15 min, and then was slowly added to an excess of NaHCO 3 aqueous solution with vigorous stirring.…”

“…Coal mine methane is not only a greenhouse gas but also a wasted energy resource if not utilized correctly [1][2][3][4]. It is well known that methane is the second largest contributor to global warming after carbon dioxide, and it has a global warming potential 21 times that of carbon dioxide [5].…”

“…The low concentration of methane [1,3] and a negative effect of water [10][11][12][13][14][15][16][17][18] are * Corresponding author. Tel.…”

An Experimental and Kinetic Modelling Study for Methane Oxidation over Pd-based Catalyst: Inhibition by Water

“…However, the catalytic activity of these systems is decreasing with time-on-stream and significant research has been addressed to understand the mechanism of Pdbased catalyst deactivation during the methane oxidation. The water inhibition effect has been discussed extensively [4][5][6][7][8][9][10][11][12][13][14][15] and the formation of surface hydroxyls is considered to be a key deactivation pathway, which results in the slow deactivation of the catalyst due to the continuous formation and accumulation of these surface species [8,16]. Moreover, it was shown that competitive adsorption between methane and water molecules plays a role in the catalytic activity loss [5,9,15,17,18].…”

Communication: Suppression of sintering of size-selected Pd clusters under realistic reaction conditions for catalysis

“…Methane is a major greenhouse gases but also a clean energy source, with the lowest CO 2 yield per unit of energy produced. 9,10 Thus efforts to utilize methane released in coal mine ventilation (concentration <1%) may offer significant energy, economic, and environmental benefits. To minimize unwanted NO x formation, low reaction temperatures are needed and Pd-based catalytic oxidation is promising.…”