Determination of the Surface Area of Pd and Nanometric Au Aggregates Supported on a Micrometric Solid Support by Thiol Adsorption and GC−MS

Abstract

A new sensitive and specific method to measure gold and palladium surface areas using alkanethiol adsorption coupled with analysis by gas chromatography with mass spectrometry detection has been developed. The effectiveness of the method was tested with metallic samples having a known surface area. The results have also been compared with BET specific surface area measurements. The results obtained with both methods show a good correlation.

Review of supported metal nanoparticles: synthesis methodologies, advantages and application as catalysts

“…Various studies reported on the supported M-NP surface area determination using organothiol as probe molecules. It was shown that the surface areas of supported M-NPs as determined by organothiol adsorption method are in agreement with those calculated on the basis of the theoretical models and characterization [150,233,253,255,261,262]. Table 1 shows some examples.…”

“…Nevertheless, those methods require expensive instrumentations and are limited by the properties of the support. Thus, chemisorption methods, using organothiols as probe molecules, are theoretically appropriate for the determination of the specific surface area of supported M-NPs [150,233,253,261,262]. The method, therefore, does not require dedicated and expensive equipment, and tedious sample preparation.…”

“…Ligand adsorption methods and approach Usually long-chained and heterocyclic compounds containing S are used and adsorb on all metal surface atoms [253,255,261]. Organothiols strongly and specifically adsorb on the surface of the metals and thus form self-assembling monolayers (SAMs) [263][264][265].…”

Kinetics of the catalytic oxidation of morin on γ-Al 2 O 3 supported gold nanoparticles and determination of gold nanoparticles surface area and sizes by quantitative ligand adsorption

“…As mentioned earlier, true surface area and particle size determination are key aspects of the activity of metal nanoparticle catalysts. Chemisorption methods using organothiols as probe ligands are in principle suitable for the specific surface area determination of the supported AuNPs [39][40][41][42]. It was reported that no adsorption is observed, except for CuO and AgO, when organothiols are exposed to oxidic supports [43].…”

A simple way to prepare Au@polypyrrole/Fe3O4 hollow capsules with high stability and their application in catalytic reduction of methylene blue dye

“…It has been proven through investigations that anchoring metal nanoparticles on supports is an effective approach to solve the above two drawbacks. [5][6][7] Therefore, many materials with active sites for anchoring metal nanoparticles have been developed as candidates for catalyst supports. Of the wide range of supports, hollow capsules have attracted considerable interest due to their low density, high surface area and large void volume.…”