Ultrasound-assistant preparation of Cu-SAPO-34 nanocatalyst for selective catalytic reduction of NO by NH3.
The influence of the various preparation methods of Cu-SAPO-34 nanocatalysts on the selective catalytic reduction of NO with NH3 under excess oxygen was studied. Cu-SAPO-34 nanocatalysts were prepared by using four techniques: conventional impregnation (IM), ultrasound-enhanced impregnation (UIM), conventional deposition precipitation (DP) using NaOH and homogeneous deposition precipitation (HDP) using urea. These catalysts were characterized in detail by various techniques such as N2-sorption, XRD, TEM, H2-TPR, NH3-TPD and XPS to understand the catalyst structure, the nature and the dispersed state of the copper species, and the acid sites for NH3 adsorption. All of the nanocatalysts showed high activities for NO removal. However, the activities were different and followed the sequence of Cu-SAPO-34 (UIM)>Cu-SAPO-34 (HDP)>Cu-SAPO-34 (IM)>Cu-SAPO-34 (DP). Based on the obtained results, it was concluded that the NO conversion on Cu-SAPO-34 nanocatalysts was mainly related to the high reducibility of the isolated Cu(2+) ions and CuO species, the number of the acid sites and the dispersion of CuO species on SAPO-34.
Department of Chemistry, Faculty of Science, University of Zanjan, Iran.
Parvaneh Nakhostin
PN
Panahi
Department of Chemical Engineering & Petroleum, University of Tabriz, Iran. Electronic address: niaei@yahoo.com.
Ali
A
Niaei
Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Iran.
Darush
D
Salari
Faculty of Chemistry, University of Kashan, Iran.
Seyed Mahdi
SM
Mousavi
Institut Charles Gerhardt, UMR 5253 CNRS/UM2/ENSCM/UM1, Equipe "Matériaux Avancés pour la Catalyse et la Santé" Ecole Nationale Supérieure de Chimie de Montpellier, 8 rue de l'Ecole Normale, 34296 Montpellier cedex, France.
Gérard
G
Delahay
D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control*; D000641:Ammonia / Q000737:chemistry*; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D014465:Ultrasonics
D000393:Air Pollutants; D009569:Nitric Oxide; D000641:Ammonia; D003300:Copper
Cu-SAPO-34; NH(3)-SCR; NO; Ultrasonic impregnation