Abstract
The influence of the protecting agent’s nature on gold particle size and dispersion was studied in this work over a series of gold-based catalysts. CO and glucose oxidation were chosen as catalytic reactions to determine the catalyst’s structure–activity relationship. The nature of the support appeared to be the predominant factor for the increase in activity, as the oxygen mobility was decisive for the CO oxidation in the same way that the Lewis acidity was decisive for the glucose oxidation. For the same catalyst composition, the use of montmorillonite as the stabilizing agent resulted in better catalytic performance.
Highlights
The use of renewable feedstocks to produce platform chemicals as an alternative to the classical petrochemical route is attracting more and more scientific attention [1,2]
The catalytic performance in CO and glucose oxidation reactions of those nanoparticles immobilized over a series of supports were used to determine the influence of the stabilizing agent on gold particle size, dispersion and activity
The total gas flow employed in the catalytic test was 42 mL/min−1 corresponding to a weight hourly space velocity (WHSV) of 31.5 L g(cat) −1 h−1
Summary
The use of renewable feedstocks to produce platform chemicals as an alternative to the classical petrochemical route is attracting more and more scientific attention [1,2]. Reported to be promising for the selective production of gluconic acid [12,13,14,15] They are very stable and effective in the presence of a base [16], gold catalysts deactivate rapidly in base-free conditions due principally to metal leaching and sintering [12]. Catalysts 2019, 9, 125 time and money spent on reaction steps, such as gluconate salt separation and conversion to acid This is why the most important requisite for using gold catalysts is to improve their stability in base-free conditions. For this purpose, the use of nanoparticle stabilizing agents, or a highly specific surface support could be useful to prevent both gold leaching and sintering. The catalytic performance in CO and glucose oxidation reactions of those nanoparticles immobilized over a series of supports were used to determine the influence of the stabilizing agent on gold particle size, dispersion and activity
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