Synergism of cobalt and palladium in MFI zeolite of relevance to NO reduction with methane

Supported bimetallic Pd–Co catalysts: characterization and catalytic activity

“…hydrogenation of 1,3-butadiene impurities in commercial n-butene streams [13], hydrogenation of CO [14,15], methane activation to higher hydrocarbons [15] and recently the SCR of NO x by methane [16][17][18][19][20][21][22][23][24]. In this work, the general properties of bimetallic Pd-Co supported on inorganic oxides on several hydrogenation reactions are reviewed.…”

The Simple, Effective Synthesis of Highly Dispersed Pd/C and CoPd/C Heterogeneous Catalysts via Charge-Enhanced Dry Impregnation

“…When the oxide is in contact with a solution of which the pH is less than PZC, the hydroxyl groups protonate and acquire a positive charge and show affinity towards anions like [PtCl 6 ] 2´. Similarly, when it is contacted with higher pH solution, the oxide surface shows affinity towards cations like [Pt(NH 3 ) 4 ] 2+ . In either case, at a particular pH, the affinity attains a maximum and that particular pH is known as the point of strong electrostatic attraction.…”

“…Recently, there has been a great deal of interest in bimetallic catalysts research due to their novel chemical (catalytic) and physical (especially magnetic and electronic) properties. CoPd bimetallic catalysts have potentially high activity and selectivity for many reactions, including Fuel cells [1,2], Fischer-Tropsch [3], NO reduction [4], CO hydrogenation [5], formic acid electrooxidation [6], methanol oxidation reaction [7], ethanol synthesis from syngas [8], and hydrogenolysis [9][10][11]. Small particle size (~10-100 Å) and high dispersion lends catalysts cost effective, efficient and economical.…”

“…About 3-4 mL of solution was filtered and analyzed using Inductively Coupled Plasma spectroscopy (ICP) (Supplied by Perkin-Elmer Optima 2000, American Fork, UT, USA) to quantify metal adsorption. Amounts of 0.1-1 N HCl, HNO 3 , NH 4 OH and NaOH were employed to adjust solution pH. The remaining solution was filtered and metal adsorbed oxide material was collected and dried at room temperature, and then at 110˝C for 12 h, followed by reduction at 200˝C for 1 h. The adsorption to reduction procedure was repeated three times to increase the metal content of the catalysts as SEA is limited to one monolayer of metal complex ion.…”

“…Drying the slurry at room temperature, followed by drying at 110˝C and high-temperature reduction in flowing pure H 2 results in highly dispersed monometallic/bimetallic nanoparticles supported on carbons. In the case of usual dry impregnation (DI), metal precursors were dissolved in a pore volume equivalent of distilled water instead of HNO 3 or NH 4 2 solution, was taken in a 250-mL polypropylene bottle and shaken for 1 h for adsorption of the metal precursor on the support. About 3-4 mL of solution was filtered and analyzed using Inductively Coupled Plasma spectroscopy (ICP) (Supplied by Perkin-Elmer Optima 2000, American Fork, UT, USA) to quantify metal adsorption.…”