Nanogold-Containing Catalysts for Low-Temperature Removal of S-VOC from Air

• Published in: Topics in catalysis 2009-04, Vol.52 (4), p.351-358
• Main Authors: Kucherov, Alexei V., Tkachenko, Olga P., Kirichenko, Olga A., Kapustin, Gennady I., Mishin, Igor V., Klementiev, Konstantin V., Ojala, Satu, Kustov, Leonid M., Keiski, Riitta
• Format: Article
• Language: English
• Subjects: Catalysis; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Original Paper; Pharmacy; Physical Chemistry
• ISSN: 1022-5528; 1572-9028
• DOI: 10.1007/s11244-008-9168-y

Activity and selectivity of mono- and bimetallic catalysts containing nano-particles of gold stabilized by different supports are compared in dimethyldisulfide removal from air at 150–320 °C. TiO 2 -supported Au and Au–Pd samples demonstrate stable and efficient DMDS removal at temperature as low as 155 °C, with formation of the two products: SO 2 and elemental S. On the contrary, no formation of elemental S is detected in the case of Au, Au–Rh, and Au–Pd catalysts supported on HZSM-5, H-beta, or MCM-41. The most active Au–Rh/HZSM-5 catalyst demonstrates an efficient DMDS removal at 290 °C, with quantitative DMDS-to-SO 2 oxidation. Characterization of catalysts with TPR, XRD, and (XANES + EXAFS) confirms a high dispersion of the metallic phases in all catalysts under study. Specific interaction between nano-particles of gold and titanium dioxide surface could be responsible for the unusual catalytic behavior of Au/TiO 2 samples, as distinct from Au/zeolitic systems.