Catalytic Oxidation of Chlorinated Organics over Lanthanide Perovskites: Effects of Phosphoric Acid Etching and Water Vapor on Chlorine Desorption Behavior

• DOI: 10.1021/acs.est.8b04582
• Publication Date: 2018-11-26T09:26:59Z
• Authors: Xiaole Weng; Qingjie Meng; Jiajia Liu; Weiyu Jiang; Samuel Pattisson; Zhongbiao Wu
• Keywords: Phosphoric acid; Thermal desorption spectroscopy; Catalytic Oxidation

In this article, the underlying effect of phosphoric acid etching and additional water vapor on chlorine desorption behavior over a model catalyst La3Mn2O7 was explored. Acid treatment led to formation LaPO4 enhanced mobility lattice oxygen evidenced by range characterization (i.e., X-ray diffraction, temperature-programmed analyses, NH3–IR, etc.). The former introduced thermally stable Brönsted acidic sites that dichloromethane (DCM) hydrolysis while latter facilitated accumulated at elevated temperatures. acid-modified displayed superior catalytic activity in DCM oxidation compared untreated sample, which ascribed abundance proton donors Mn(IV) species. addition reaction favored HCl avoided surface chlorination low This resulted further reduction temperature under humid conditions (T90 380 °C for modified catalyst). These results provide an in-depth interpretation oxidation, should aid future design industrial catalysts durable combustion chlorinated organics.