AFM studies of the catalytic reaction of hydrogen with oxygen on thin Pd and Pt films under pressure ∼101 kPa

Nowakowski, Robert; Grzeszczak, Patrycja; Duś, R.

doi:10.1016/s0039-6028(02)01357-2

Cited by 18 publications

(15 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This seems to be confirmed by a report on the formation of a multilayer deposit of water on the Pd and Pt surface during the cyclic treatments of the films of these metals by hydrogen and oxygen monitored by "in situ" atomic force microscopy (AFM) [53]. In the present work, catalysts deactivation is observed in the recombination reaction studied in the flow reactor (Table 3) as well as in the microcalorimetric experiments.…”

Section: Microcalorimetric Experimentssupporting

confidence: 86%

Humidity induced deactivation of Al2O3 and SiO2 supported Pd, Pt, Pd-Pt catalysts in H2+O2 recombination reaction: The catalytic, microcalorimetric and DFT studies

Lalik

Kosydar

Tokarz-Sobieraj

et al. 2015

Applied Catalysis A: General

View full text Add to dashboard Cite

Section: Microcalorimetric Experimentssupporting

confidence: 86%

Humidity induced deactivation of Al2O3 and SiO2 supported Pd, Pt, Pd-Pt catalysts in H2+O2 recombination reaction: The catalytic, microcalorimetric and DFT studies

Lalik

Kosydar

Tokarz-Sobieraj

et al. 2015

Applied Catalysis A: General

View full text Add to dashboard Cite

“…The value of the CPE exponent [35] for the capacitance of the double layer, u dl , varied between 0.99 in the double layer region to 0.96 below 0.1 V. The decrease of the CPE exponent might be related to high stress and possible surface deformations of thin Pd layer especially in b-PdH phase region. Such effects were described in the literature from the AFM studies in gas phase [37][38][39]. The average values of the double layer capacitance are shown in Fig.…”

Section: Impedance Spectroscopymentioning

confidence: 75%

Hydrogen adsorption/absorption on Pd/Pt(111) multilayers

Duncan

Lasia

2008

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

“…Dissolved oxygen tension in the growth medium was measured by an autoclavable oxygen electrode (Applisens), and maintained at 80% air saturation by reduction of O 2 in the gas loop on a Pd surface (see e.g., Nowakowski et al 2002 ). Fixed amounts of H 2 (223 ± 13 μmol) were delivered through a third solenoid valve (opened for 0.1 s) located at a position just before the gas entered the Pd catalyst column (Figure 1 ).…”

Section: Methodsmentioning

confidence: 99%

On-line estimation of O2 production, CO2 uptake, and growth kinetics of microalgal cultures in a gas-tight photobioreactor

et al. 2006

View full text Add to dashboard Cite

Growth of the green algae Chlamydomonas reinhardtii and Chlorella sp. in batch cultures was investigated in a novel gas-tight photobioreactor, in which CO 2 , H 2 , and N 2 were titrated into the gas phase to control medium pH, dissolved oxygen partial pressure, and headspace pressure, respectively. The exit gas from the reactor was circulated through a loop of tubing and re-introduced into the culture. CO 2 uptake was estimated from the addition of CO 2 as acidic titrant and O 2 evolution was estimated from titration by H 2 , which was used to reduce O 2 over a Pd catalyst. The photosynthetic quotient, PQ, was estimated as the ratio between O 2 evolution and CO 2 up-take rates. NH 4 + , NO 2 − , or NO 3 − was the final cell density limiting nutrient. Cultures of both algae were, in general, characterised by a nitrogen sufficient growth phase followed by a nitrogen depleted phase in which starch was the major product. The estimated PQ values were dependent on the level of oxidation of the nitrogen source. The PQ was 1 with NH 4 + as the nitrogen source and 1.3 when NO 3 − was the nitrogen source. In cultures grown on all nitrogen sources, the PQ value approached 1 when the nitrogen source was depleted and starch synthesis became dominant, to further increase towards 1.3 over a period of 3-4 days. This latter increase in PQ, which was indicative of production of reduced compounds like lipids, correlated with a simultaneous increase in the degree of reduction of the biomass. When using the titrations of CO 2 and H 2 into the reactor headspace to estimate the up-take of CO 2 , the production of O 2 , and the PQ, the rate of biomass production could be followed, the stoichiometrical composition of the produced algal biomass could be estimated, and different growth phases could be identified.

show abstract

AFM studies of the catalytic reaction of hydrogen with oxygen on thin Pd and Pt films under pressure ∼101 kPa

Cited by 18 publications

References 9 publications

Humidity induced deactivation of Al2O3 and SiO2 supported Pd, Pt, Pd-Pt catalysts in H2+O2 recombination reaction: The catalytic, microcalorimetric and DFT studies

Humidity induced deactivation of Al2O3 and SiO2 supported Pd, Pt, Pd-Pt catalysts in H2+O2 recombination reaction: The catalytic, microcalorimetric and DFT studies

Hydrogen adsorption/absorption on Pd/Pt(111) multilayers

On-line estimation of O2 production, CO2 uptake, and growth kinetics of microalgal cultures in a gas-tight photobioreactor

Contact Info

Product

Resources

About