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Pt Catalyst over SiO2 and Al2O3 Supports Synthesized by Aerosol Method for HC-SCR DeNOx Application

Category: Air Pollution Control

Volume: 15 | Issue: 6 | Pages: 2409-2421
DOI: 10.4209/aaqr.2015.03.0202
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Riyan Zahaf1, Jae Wook Jung1, Zachary Coker2, Songkil Kim3, Tae-Youl Choi2, Donggeun Lee 1

  • 1 School of Mechanical Engineering, Pusan Clean Coal Center, Pusan National University, Busan 609-735, Korea
  • 2 Department of Mechanical and Energy Engineering, University of North Texas, Denton, TX 76207, USA
  • 3 School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

Highlights

Well dispersed Pt nanodots over SiO2 and Al2O3 spherical supports are formed.

Formation mechanisms of Pt dots for both cases are clarified with calculation.

Based on FTIR measurements, details of HC-SCR are better understood.


Abstract

Silica-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.

Keywords

Pt/SiO2 Pt/Al2O3 Aerosol DeNOx Catalyst


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