title: Oxidation-resistant acidic resins prepared by partial carbonization as cocatalysts in synthesis of adipic acid.
abstract: The oxidation-resistant acidic resins are of great importance for the catalytic oxidation systems. In this paper, the oxidatively stable acidic resins are obtained from the cation ion exchange resins (CIERs) through the thermal treatment in N(2) atmosphere. The structure and properties of the thermally treated CIERs were characterized by chemical analysis, Fourier transform infrared (FT-IR) spectra, acid capacity measurement and scanning electron microscope (SEM). The thermally treated CIERs possess high acid capacity up to 4.09 mmol g(-1). A partial carbonization is observed in the thermal treatment process of CIERs, but the morphology of resin spheres maintains well. The as-prepared CIERs are used as solid acids to assist the hydrogen peroxide oxidation of cyclohexene to adipic acid (ADA) with tungstic acid as the catalyst precursor. The improved yields of ADA in the recycling reaction are obtained in the presence of acidic CIERs. Meanwhile, the unproductive decomposition of H(2)O(2) is effectively suppressed. The high yields of ADA (about 81%) are kept by the thermally treated CIERs even after the fifth cycle. The thermally treated CIERs exhibit excellent acid-catalytic performance and possess remarkable oxidation-resistant capability.
authors: Institute of Industrial Catalysis, College of Chemistry and Molecular Engineering, Zhengzhou University, 100 Science Road, Zhengzhou 450001, P R China.
authors: Huijuan
authors: H
authors: Wei
authors: Hongbian
authors: H
authors: Li
authors: Yangqing
authors: Y
authors: Liu
authors: Peng
authors: P
authors: Jin
authors: Xiangyu
authors: X
authors: Wang
authors: Baojun
authors: B
authors: Li
mesh_terms: D000143:Acids; D000272:Adipates / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D053138:Cyclohexenes / Q000737:chemistry; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000737:chemistry; D008855:Microscopy, Electron, Scanning / Q000379:methods; D008956:Models, Chemical; D009584:Nitrogen / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods
chemical_list: D000143:Acids; D000272:Adipates; D053138:Cyclohexenes; D011108:Polymers; C052568:cyclohexene; D002244:Carbon; C029900:adipic acid; D006861:Hydrogen Peroxide; D009584:Nitrogen; D010100:Oxygen