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Low-temperature selective catalytic reduction of NO on CeO2-CuO/Al2O3 catalysts prepared by different methods.

Environmental technology (2014-06-25)
Rui-Tang Guo, Wen-Long Zhen, Wei-Guo Pan, Jie-Nan Hong, Qiang Jin, Cheng-Gang Ding, Shi-Yi Guo
RESUMO

CeO2-CuO/Al2O3 catalysts were prepared by three different methods and their activities for selective catalytic reduction (SCR) of NO with NH3 were investigated. As can be seen from the experimental results, the catalyst prepared by the single-step sol-gel (SG) method showed the best SCR activity and resistance to SO2 and H2O. In order to investigate the relationship between the preparation method and the performance of SCR catalysts, the catalysts were characterized by using Brunauer-Emmett-Teller, X-ray diffraction, temperature programmed reduction with hydrogen, temperature programmed desorption with ammonia, X-ray photoelectron spectroscopy, Fourier transform infrared and thermo-gravimetric analysis techniques. It was found that the excellent performance of CeO2-CuO/Al2O3 catalyst prepared by the single-step SG method should be resulted from its large surface area, low crystallinity, high oxygen storage capacity, high NH3 adsorption capacity, high concentration of surface chemisorbed oxygen, weak sulphation process and weak water absorption.

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Sigma-Aldrich
Copper(II) oxide, 99.999% trace metals basis
Supelco
Water, for TOC analysis
Sigma-Aldrich
Aluminum oxide, mesoporous, MSU-X (wormhole), average pore size 3.8 nm
Sigma-Aldrich
Copper, beads, 2-8 mm, 99.9995% trace metals basis
Sigma-Aldrich
Copper, foil, thickness 0.025 mm, 99.98% trace metals basis
Copper - O.F.H.C., foil, 10mm disks, thickness 0.15mm, half hard, 99.95+%
Copper, tube, 500mm, outside diameter 5.0mm, inside diameter 4mm, wall thickness 0.5mm, as drawn, 99.9%
Copper - O.F.H.C., foil, 25mm disks, thickness 0.125mm, hard, 99.95+%
Copper, tube, 500mm, outside diameter 6.0mm, inside diameter 4mm, wall thickness 1.0mm, as drawn, 99.9%
Copper - O.F.H.C., foil, 50mm disks, thickness 0.5mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 2m coil, thickness 0.1mm, annealed, 99.95+%
Copper - O.F.H.C., foil, 10m coil, thickness 0.125mm, hard, 99.95+%
Copper - O.F.H.C., foil, 5m coil, thickness 0.075mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 25mm disks, thickness 0.15mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 1m coil, thickness 0.1mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 25mm disks, thickness 0.075mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 15mm disks, thickness 0.25mm, annealed, 99.95+%
Copper - O.F.H.C., foil, 10mm disks, thickness 0.05mm, hard, 99.95+%
Copper, tube, 500mm, outside diameter 3.0mm, inside diameter 1.2mm, wall thickness 0.9mm, as drawn, 99.9%
Copper - O.F.H.C., foil, 20m coil, thickness 0.010mm, coil width 25mm, hard, 99.95+%
Copper - O.F.H.C., foil, 1m coil, thickness 0.05mm, coil width 10mm, annealed, 99.95+%
Copper, wire reel, 0.5m, diameter 0.125mm, as drawn, 99.99+%
Copper - O.F.H.C., foil, 10m coil, thickness 0.1mm, hard, 99.95+%
Copper - O.F.H.C., foil, 2m coil, thickness 0.7mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 5m coil, thickness 0.125mm, hard, 99.95+%
Copper - O.F.H.C., foil, 10mm disks, thickness 0.025mm, hard, 99.95+%
Copper - O.F.H.C., foil, 10mm disks, thickness 0.1mm, hard, 99.95+%
Copper - O.F.H.C., foil, 300x300mm, thickness, 0.5mm, half hard, flattened, 99.95+%
Copper - O.F.H.C., foil, 2m coil, thickness 0.025mm, hard, 99.95+%
Copper - O.F.H.C., foil, 20m coil, thickness 0.05mm, coil width 10mm, annealed, 99.95+%