Preparation of steam-activated carbons as catalyst supports

Lázaro, M.J.; Gálvez, María Elena; Artal, S.; Palacios, J.M.; Moliner, R.

doi:10.1016/j.jaap.2006.08.007

Cited by 44 publications

(17 citation statements)

References 34 publications

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“…At these conditions, an important generation of hydrogen may be occurring, whose inhibitory effect in the activation process has been widely reported in literature [24,25]. This inhibitory effect is thought to be due to the displacement of the equilibrium in the activation reactions or even to a reversible reaction of the hydrogen in the active centers of the carbon matrix that could lead to their deactivation [26]. Fig.…”

Section: Characterization Of Activated Charsmentioning

confidence: 91%

NH3 selective catalytic reduction (SCR) of nitrogen oxides (NO x ) over activated sewage sludge char

Sun

et al. 2010

Korean J. Chem. Eng.

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The de-NO x performance of sewage sludge chars activated physically using water vapor or chemically using KOH was evaluated. Characteristics of chars activated under different activation temperatures, water vapor concentrations, and KOH/char ratios were analyzed by N 2 adsorption-desorption and FT-IR. Chemically activated chars were more efficient in removing NO x due to their higher surface area, oxygen functional group and NH 3 adsorption than physically activated chars. The de-NO x performance of the activated chars is influenced more by chemical properties such as oxygen functional groups and NH 3 adsorption sites than by physical properties like specific surface area and pore volume.

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Section: Characterization Of Activated Charsmentioning

confidence: 91%

NH3 selective catalytic reduction (SCR) of nitrogen oxides (NO x ) over activated sewage sludge char

Sun

et al. 2010

Korean J. Chem. Eng.

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“…TPD has become one of the most outstanding techniques for the evaluation of the surface chemistry in carbon materials [31]. In previous studies, we reported [13,15] the relationship that exists between the amount of oxygenated surface groups (OSG) desorbed as CO and CO 2 after a TPD experiment and the initial activity rate for the fresh catalysts.…”

Section: Surface Chemistrymentioning

confidence: 99%

Carbonaceous materials as catalysts for decomposition of methane

Suelves

Pinilla

Lázaro

et al. 2008

Chemical Engineering Journal

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“…Raman spectroscopy is a well-known technique revealing short-range structural order changes in carbon materials. A Raman spectrum of perfect graphite shows a single narrow first order peak at 1580 cm −1 known as G band, ascribed to the stretching of C-C bonds in the hexagonal rings [23,24]. However, in imperfect graphite, G band is usually accompanied by another band at about 1360 cm…”

Section: Influence Of Synthesis Conditions In the Structural Propertimentioning

confidence: 99%

Tailoring Synthesis Conditions of Carbon Xerogels towards Their Utilization as Pt-Catalyst Supports for Oxygen Reduction Reaction (ORR)

et al. 2012

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Carbon xerogels characterized by different textural, structural and chemical properties were synthesized and used as supports for Pt catalysts for the application in polymer electrolyte fuel cells. Synthesis conditions were varied in order to synthesize carbon xerogels following the sol-gel method. These included the reactants ratio (precursor/formaldehyde), the catalyst concentration (precursor/catalyst ratio) and type (basic and acid), the precursor type (resorcinol and pyrogallol) and the solvent (aqueous or acetone based). Stoichiometric mixtures of resorcinol and formaldehyde yielded well polymerized gels and highly developed structures. Slow gelation, favored by the presence of acetone as solvent in the sol and low catalyst concentration, resulted in higher polymerization extent with a highly mesoporous or even macroporous texture and more ordered structure, as evidenced by XPS and Raman spectroscopy. Small Pt particles of ca. 3.5 nm were obtained by using carbon xerogels characterized by an ordered surface structure. The specific activity towards the oxygen reduction reaction, i.e., the limiting catalytic process in low temperature fuel cells, is significantly favored by highly ordered carbon xerogels due to a metal-support enhanced interaction. Nevertheless, surface defects favor the distribution of the metallic particles on the surface of carbon, which in the end influences the effectiveness of the catalyst. Accelerated degradation tests were conducted to evaluate catalyst stability under potential cycling conditions. The observed decay of OPEN ACCESSCatalysts 2012, 2 467 performance was considerably lower for the catalysts based on ordered carbon xerogels stabilizing Pt particles in a higher extent than the other xerogels and the commercial carbon black support.

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Preparation of steam-activated carbons as catalyst supports

Cited by 44 publications

References 34 publications

NH3 selective catalytic reduction (SCR) of nitrogen oxides (NO x ) over activated sewage sludge char

NH3 selective catalytic reduction (SCR) of nitrogen oxides (NO x ) over activated sewage sludge char

Carbonaceous materials as catalysts for decomposition of methane

Tailoring Synthesis Conditions of Carbon Xerogels towards Their Utilization as Pt-Catalyst Supports for Oxygen Reduction Reaction (ORR)

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