Application of Cs salt of 12-tungstophosphoric acid supported on SBA-15 mesoporous silica in NO x storage |
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| Authors: | Landau M V Rao P M Thomas S Pitchon V Zukerman R Vradman L Herskowitz M |
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| Affiliation: | (1) Blechner Center for Industrial Catalysis and Process Development, Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel;(2) Department of Chemical Engineering, Sami Shamoon College of Engineering, Beer-Sheva, 84100, Israel;(3) Laboratoire de Matériaux, Surfaces et Procédés pour la Catalyse, LMSPC, UMR 7515 du CNRS-ECPM, 25 Rue Becquerel, 67087 Strasbourg Cedex 2, France |
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| Abstract: | 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 NO
x
storage. The optimal NO
x
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
NO
x
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 NO
x
removal from lean exhaust gases in highly dynamic aftertreatment technologies. |
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| Keywords: | NO x storage absorption and desorption efficiency Cs salt of 12-tungstophosphoric acid SBA-15 |
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