Recovery of Au Nanoparticles via High‐Solubility Carboxylic Starch and its Significantly Improved Catalysis of Propylene Epoxidation. (11th March 2020)

• Record Type: Journal Article
• Authors: Zhang, Shuidong; Shi, Tao; Lin, Zesheng; Chen, Chuanrui; Chen, Yukun; Odoom‐Wubah, Tareque
• Is Part Of: Stärke. Volume 72:Number 5/6(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-03-11
• Subjects: bioreduction -- carboxyl corn starches -- high solubility -- propylene epoxidation -- recovery of Au; Starch -- Periodicals; 572.566
• DOI: 10.1002/star.201900313
• Languages: English
• ISSNs: 0038-9056

Abstract

Abstract: Recovery of Au nanoparticles (Au NPs) catalysts via bioreduction method has attracted much attention due to its cost‐effective and eco‐friendly. However, it is a great challenge to recover Au NPs by starch due to its poor solubility. Herein, a novel biomolecule, carboxyl corn starch (CCS), exhibited high solubility and low viscosity is successfully fabricated and utilized to reduce HAuCl4 in the homogeneous phase environment. Effects of CCS concentration on the structure and performances of Au NPs and its loading in the TS‐1 support (Au/TS‐1) are investigated. The results reveal that both the particle size and Au NPs recovery rate increased with the increase of CCS concentration, while the BET data of Au/TS‐1 decreased. The Au/TS‐1 catalyst achieved 353.01 m 2 g −1 surface area and 0.293 cm 3 g −1 pore volume with 2.0 ± 0.3 nm average diameter of loaded Au NPs. When this catalyst is employed to catalyze the vapor phase propylene epoxidation with H2 /O2 mixture, the propylene conversion rate (19.2%) achieved 67% and 5.8 fold increases when in data reported (11.5%) and soluble starch are used as the control, respectively. The study develops a green and facile method for Au recovery via carboxyl starch bioreduction and Au/TS‐1 exhibited significantly improves catalysis of propylene epoxidation. Abstract : Recovery of Au nano‐particles (Au NPs) catalysts via bioreduction method has attracted enormous attention due to its cost‐effectiveness and eco‐friendliness. Herein, Carboxyl corn starch (CCS) fabricated by H2 O2 exhibits high solubility and low viscosity is utilized to reduce HAuCl4 in the homogeneous phase environment. Au NPs recovery via CCS bioreduction exhibits significantly improved catalysis of propylene epoxidation.