Clean Oxidation of Cyclohexanone to Adipic Acid Catalyzed by Ammonium Phosphomolybdate with Dawson Structure under Microwave Irradiation

Abstract:

Ammonium Phosphomolybdate with Dawson structure was prepared by hydrothermal synthesis and characted by means of FT-IR, UV-Vis,XRD and SEM. The synthesis of adipic acid with cyclohexanone and 30 percent hydrogen peroxide under microwave irradiation was carried out as a probe reaction to study the catalytic activity. Effects of catalyst amount,30wt.% H₂O₂ amount,microwave power, reaction time were investigated and optimized with orthogonal experiments and simple fact experiments. The results show that under the optimal condition, i.e. the mole ratio of C₆H₁₀O: H₂O₂:H₂C₂O₄•2H₂O:(NH₄)₆P₂Mo₁₈O₆₂•nH₂O =100:500:2.0:0.087, the reaction temperature was 100°C, microwave power was 400W, irradiation time was 3.5 h，the isolated yield of adipic acid could reach 72.5%．The catalyst could be reused for 5 times and the isolated of adipic acid was still above 43.2%.

• Periodical: Advanced Materials Research (Volumes 550-553)
• Pages: 170-174
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.550-553.170
• Online since: July 2012
• Authors: Xiao Hua Cao, Jie Ren, Chang Long Xu, Bao Hua Xie, De Si Sun
• Keywords: (NH₄)₆P₂Mo₁₈O₆₂, Adipic Acid, Cyclohexanone, Hydrogen Peroxide, Microwave Irradiation

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