In situ generated Ligand-Free gold nanoparticles in polyvinylpyrrolidone solution assisted laser in liquid method for green oxidation of cyclohexane to adipic acid with high yield

• Published in: Applied surface science 2022-04, Vol.581, p.152388, Article 152388
• Main Authors: Nilforoushan, Sheyda, Ghiaci, Mehran, Mahdi Hosseini, Sayyed, Kulinich, Sergei A., Wunderlich, Wilfried, Farrokhpour, Hossein
• Format: Article
• Language: English
• Subjects: Adipic acid; Au nanoparticles; Cyclohexane oxidation; Pulse laser ablation in liquid
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2021.152388

[Display omitted] •The simple, green and fast PLAL method was implemented for free-ligand Au nanoparticles synthesis.•Gold nanoparticles coated-double silica shells was developed for aerobic oxidation of cyclohexane.•The Au@SiO2@SiO2 nanocatalyst exhibited the good activity and excellent selectivity to adipic acid. Here in we report a very simple method to create gold nanoparticles coated-double silica shells by using a three step process containing pulse laser ablation (PLAL) of metallic gold target in aqueous solution of polyvinylpyrrolidone, well-known stober process and calcination at high temperature respectively for achieving of Au@SiO2@SiO2 nanoparticles with narrow size distribution. Final structure was characterized by techniques such STEM, FESEM, BET, XPS, XRD, TGA, ICP-OES and FT-IR and shows the activity of 26 % conversion in aerobic oxidation of cyclohexane to adipic acid with the 92 % selectivity in mild conditions. More over the catalyst has saved its activity until 6 cycles without any dominant losing.