title: Catalytic decomposition and mechanism of formaldehyde over Pt-Al2O3molecular sieves at room temperature.
abstract: To overcome the drawbacks of powder-like catalysts in practical application, an Al2O3molecular sieve supported Pt (Pt-Al2O3) catalyst was prepared by the impregnation method combined with dilute hydrochloric acid solution pretreatment. The role of the pretreatment solution in catalyst preparation and formaldehyde (HCHO) decomposition over Pt-Al2O3catalysts was investigated. The acid solution with pH = 1 was optimal for Pt dispersion on the Al2O3surface. The Pt-Al2O3catalyst was capable of achieving complete and stable HCHO oxidation at ambient temperature. In addition, the excellent activity for HCHO removal was promoted by the mesoporous structure, large specific surface area and high adsorption ability of Al2O3molecular sieves, as determined by N2-sorption studies. Dioxymethylene (DOM) and formate species were identified as major intermediates by in situ DRIFTS studies. These intermediates were subsequently oxidized into CO2and H2O at ambient temperature. Moreover, a possible reaction mechanism of HCHO removal and a regeneration pathway of surface hydroxyls were proposed. This study provides new insights into the preparation of practical, low-cost catalysts for indoor air purification.
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China. jiaguoyu@yahoo.com jiangcj2016@yahoo.com.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China. jiaguoyu@yahoo.com jiangcj2016@yahoo.com and Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
authors.forename: Jiaguo
authors.identifier: http://orcid.org/0000-0002-0612-8633
authors.initials: J
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China. jiaguoyu@yahoo.com jiangcj2016@yahoo.com.
authors.forename: Chuanjia
authors.initials: C
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China. jiaguoyu@yahoo.com jiangcj2016@yahoo.com.
authors.forename: Bei
authors.initials: B
authors.lastname: Cheng