Application of Cs salt of 12-tungstophosphoric acid supported on SBA-15 mesoporous silica in NOx storage

M. V. Landau, P. M. Rao, S. Thomas, V. Pitchon, R. Zukerman, L. Vradman, M. Herskowitz

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Cs salt of 12-tungstophosphoric acid (HPW) was deposited simultaneously at the external surface of the SBA-15 silica microcrystals and inside its mesoporous channels at loading of 60 wt% and Cs/W ratio in the range between 0.9 and 2, followed by impregnation of 1 wt% Pt. The performance of the Pt/CsHPW/SBA-15 composite materials was tested in the NOx storage. The optimal NOx storage capacity and efficiency were achieved at Cs/W of 1.5. The dispersion of CsHPW on SBA-15 led to a significant decrease of its crystal size (5-13 nm) compared with bulk HPW and HPW supported on titania (28-29 nm). Pt/CsHPW/SBA-15 displayed lower NOx absorption capacity but much higher absorption and desorption efficiency than the reference Pt/HPW and Pt/ HPW/TiO2 materials. Consequently, Pt/CsHPW/SBA-15 displayed a better performance in short lean (2 min)-rich (1 min) absorption-desorption cycles. The novel Pt/CsHPW/SBA-15 nanocomposites presents the basis for improved storage material for NOx removal from lean exhaust gases in highly dynamic aftertreatment technologies.

Original languageEnglish
Pages (from-to)203-207
Number of pages5
JournalTopics in Catalysis
Issue number1-4
StatePublished - 1 May 2007


  • Absorption and desorption efficiency
  • Cs salt of 12-tungstophosphoric acid
  • NO storage
  • SBA-15

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


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