Abstract
ABSTRACTSilica-supported platinum (Pt/SiO2) and alumina-supported platinum (Pt/Al2O3) catalysts have been prepared by an aerosol spray pyrolysis method. Systematic characterization of each catalyst using TEM, XRD, and XPS revealed that crystalline and metallic Pt nanoparticles were well dispersed on the surface of silica and alumina supports. The sintering effect on Pt particles over Al2O3 at high temperature (~250°C) is more prominent than those over SiO2; this suggests that there is stronger interaction between Pt particles and SiO2 support, when compared to Pt over Al2O3 support, resulting in Pt particles size below 3 nm. Moreover, steady-state catalytic experiments for selective reduction of nitrogen monoxide by propene have demonstrated that NOx conversions to N2O and N2 in Pt/SiO2 and Pt/Al2O3 catalysts are 29.8% and 55.8% at 250°C, respectively.
Highlights
Emission of NOx gases from both mobile and stationary sources causes serious environmental problems such as acid rain and photochemical smog (Pitchon and Fritz, 1999; Zhang et al, 2011; Wanga et al, 2012)
Of particular interest is understanding the formation mechanism of Pt dots on the surface of the metal oxide spheres, in view of size and hetero-structure of Pt particles; when a droplet evaporates during the spray-pyrolysis process, the dissolved solutes are locally concentrated near the droplet surface, and diffuse toward the center of the droplet in response to the concentration gradient, while the solvent diffuses toward the outermost region, and evaporates
Catalyst of well dispersed Pt particles over SiO2 and Al2O3 supports were fabricated successfully via an aerosol method combined with pyrolysis
Summary
Emission of NOx gases from both mobile and stationary sources causes serious environmental problems such as acid rain and photochemical smog (Pitchon and Fritz, 1999; Zhang et al, 2011; Wanga et al, 2012). NOx treatment technologies have drawn much attention in view of catalysis, especially for treating various exhaust gases produced by state-of-the-art automobile engines (Haj et al, 2002). Aerosol and Air Quality Research, 15: 2409–2421, 2015 catalysts reached 75% and 60%, respectively. Such metal oxide supports are known to lower the working temperatures of Pt catalysts and minimize the undesirable corrosion effect of water vapor and sulfur oxides (SOx) (Burch and Watling, 1997; Gonzalez et al, 1997; Männikkö et al, 2012)
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