Synthesis, Characterization of Ag/MCM-41 and the Catalytic Performance for Liquid-phase Oxidation of Cyclohexane

Abstract

Nano-scale silver supported mesoporous molecular sieve Ag/MCM-41 was directly prepared by one-pot synthesis method. The prepared sample was characterized by XRD, TEM, and N 2 sorption. The results showed that the sample of Ag/MCM-41 had no appreciable incorporation of silver into the mesoporous matrix of MCM-41 with good crystallinity, and silver nanoparticles were dispersed inside or outside of the channels in the mesoporous host. The catalytic performance of the sample for the cyclohexane liquid-phase oxidation into cyclohexanone and cyclohexanol by oxygen in the absence of solvents without inducing agents was investigated. The 83.4% selectivity to cyclohexanol and cyclohexanone at 10.7% conversion of cyclohexane was obtained over Ag/ MCM-41 catalyst at 428 K for 3 h. The turn over numbers (TONs) of Ag/MCM-41 was up to 2946. The catalytic activity of Ag/ MCM-41 was also compared with Ag/TS-1 as well as Ag/Al 2 O 3 . The results indicated that Ag/MCM-41 showed superior activity to both Ag/TS-1 and Ag/Al 2 O 3 . A calcined Ag/MCM-41 was found to be an efficient catalyst for the cyclohexane oxidation into cyclohexanol and cyclohexanone using oxygen as oxidant.

Micromorphological cellular responses of MC3T3-E1 and RAW264.7 after exposure to water-dispersible silver nanoparticles stabilized by metal-carbon σ-bonds

“…In particular, silver nanoparticles (AgNPs) have been intensively studied for applications as conductive materials 1,2) and catalysts 3,4) . In addition, the use of Ag-NPs is becoming more widespread in medicine and related applications owing to the strong antimicrobial activities of these materials [5][6][7][8] , and other applications have been made possible by rapid developments in nanotechnology.…”

Solution and diffusion properties of cyclohexane, cyclohexanol, and cyclohexanone in poly(ethylene glycol) by inverse gas chromatography

“…[1][2][3][4] Among them, the selective oxidation of cyclohexane to cyclohexanol and cyclohexanone is very important reaction for commercial application. [5][6][7] Cyclohexanol and cyclohexanone are important organic intermediates in the petrochemical industry for the manufacture of caprolactam, nylon, and other products.…”

“…6 However, since cyclohexanol and cyclohexanone molecules are more reactive in oxidation than cyclohexane, their overoxidation prevents the selective synthesis at higher cyclohexane conversion. 3,4 In the present industrial technology, the conversion of this reaction is always controlled about 3-10% for keeping higher selectivity. Therefore, the reaction mixture contains a large amount of cyclohexane (about 95%), [4][5][6][7] and the industrial separation requires a three-step distillation.…”

“…3,4 In the present industrial technology, the conversion of this reaction is always controlled about 3-10% for keeping higher selectivity. Therefore, the reaction mixture contains a large amount of cyclohexane (about 95%), [4][5][6][7] and the industrial separation requires a three-step distillation. 4 Up to now, this technology suffers from low product efficiency, high investment, and energy consumption.…”

Silver(I) Catalyzed Photochemical Oxidation of Methylene Blue and Safranine-O by Peroxydisulphate: A Green Chemical Approach

“…Synthesis and characterization of Ag/MCM-41 and its catalytic performance for liquid phase oxidation of cyclohexane were investigated by Zhao et al [17]. Yang et al [18] investigated the oxidative degradation of diethyl phthalate by photochemically enhanced Fenton reaction.…”