title: Effect of the preparation method on activity of Cu-ZSM-5 nanocatalyst for the selective reduction of NO by NH3.
abstract: The selective catalytic reduction of NO with ammonia (NH3-SCR) was studied over Cu-ZSM-5 nanocatalysts which were prepared by several methods, including conventional ion-exchange (IE), conventional impregnation (IM), ultrasound-enhanced impregnation (UIM), and conventional deposition-precipitation (DP) using NaOH and homogeneous deposition-precipitation (HDP) using urea. The nanocatalysts were subsequently characterized by Fourier transform infrared spectroscopy, temperature-programmed reduction with hydrogen (H2-TPR), ammonia temperature-programmed desorption (NH3-TPD), X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscope, and Brunauer-Emmett-Teller. The catalytic activity of the Cu-ZSM-5 nanocatalysts for NO removal decreased in the following order: Cu-ZSM-5 (HDP) > Cu-ZSM-5 (UIM) > Cu-ZSM-5 (IM) > Cu-ZSM-5 (IE) > Cu-ZSM-5 (DP). The effect of various preparation methods for Cu-ZSM-5 on the activity of NO conversion was compared and catalytic experiments revealed a strong correlation between the acid sites' strength and easily reducible isolated Cu2+with NO conversion. Catalyst (HDP) (which showed excellent deNO activity) mainly contains easy reducibility of isolated Cu2+ions, more strong acid sites, and higher specific surface area when compared with other catalysts.
authors.affiliation: a Department of Chemistry, Faculty of Science , University of Zanjan , Zanjan , Iran.
authors.forename: Parvaneh
authors.initials: P
authors.lastname: Nakhostin Panahi
authors.affiliation: b Department of Applied Chemistry, Faculty of Chemistry , University of Tabriz , Tabriz , Iran.
authors.forename: Darush
authors.initials: D
authors.lastname: Salari
authors.affiliation: c School of Occupational Safety and Health , Chung Shan Medical University , Taichung City , Taiwan, People's Republic of China.
authors.forename: Hui-Hsin
authors.initials: HH
authors.lastname: Tseng
authors.affiliation: d Catalyst & Reactor Research Group, Department of Chemical and Petroleum Engineering , University of Tabriz , Tabriz , Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Niaei
authors.affiliation: e Faculty of Chemistry , University of Kashan , Kashan , Iran.
authors.forename: Seyed Mahdi
authors.initials: SM
authors.lastname: Mousavi
mesh_terms: D000641:Ammonia; D002384:Catalysis; D009569:Nitric Oxide; D010084:Oxidation-Reduction; D014961:X-Ray Diffraction
chemical_list: D009569:Nitric Oxide; D000641:Ammonia
keywords: Cu-ZSM-5; NH3–SCR; NO reduction; homogeneous deposition–precipitation; urea