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

doi:10.1007/s11244-007-0179-x

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

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

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

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 NOx 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.

Original language	English
Pages (from-to)	203-207
Number of pages	5
Journal	Topics in Catalysis
Volume	42-43
Issue number	1-4
DOIs	https://doi.org/10.1007/s11244-007-0179-x
State	Published - 1 May 2007

Keywords

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

ASJC Scopus subject areas

Catalysis
General Chemistry

Access to Document

10.1007/s11244-007-0179-x

Cite this

@article{5140c9ad1d064b0690dc570f0af72126,

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

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 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.",

keywords = "Absorption and desorption efficiency, Cs salt of 12-tungstophosphoric acid, NO storage, SBA-15",

author = "Landau, {M. V.} and Rao, {P. M.} and S. Thomas and V. Pitchon and R. Zukerman and L. Vradman and M. Herskowitz",

note = "Funding Information: This work was supported in part by the European Commission in the Fifth Framework Programme under AHEDAT project, the contract #G3RD-CT-2002-00792. L.V. acknowledges the support of the German-Israeli Foundation for Scientific Research & Development, G.I.F. Research Grant No. I-2074-1286.10/2003.",

year = "2007",

month = may,

day = "1",

doi = "10.1007/s11244-007-0179-x",

language = "English",

volume = "42-43",

pages = "203--207",

journal = "Topics in Catalysis",

issn = "1022-5528",

publisher = "Springer",

number = "1-4",

}

TY - JOUR

T1 - Application of Cs salt of 12-tungstophosphoric acid supported on SBA-15 mesoporous silica in NOx storage

AU - Landau, M. V.

AU - Rao, P. M.

AU - Thomas, S.

AU - Pitchon, V.

AU - Zukerman, R.

AU - Vradman, L.

AU - Herskowitz, M.

N1 - Funding Information: This work was supported in part by the European Commission in the Fifth Framework Programme under AHEDAT project, the contract #G3RD-CT-2002-00792. L.V. acknowledges the support of the German-Israeli Foundation for Scientific Research & Development, G.I.F. Research Grant No. I-2074-1286.10/2003.

PY - 2007/5/1

Y1 - 2007/5/1

N2 - 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.

AB - 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.

KW - Absorption and desorption efficiency

KW - Cs salt of 12-tungstophosphoric acid

KW - NO storage

KW - SBA-15

UR - http://www.scopus.com/inward/record.url?scp=34347375411&partnerID=8YFLogxK

U2 - 10.1007/s11244-007-0179-x

DO - 10.1007/s11244-007-0179-x

M3 - Article

AN - SCOPUS:34347375411

SN - 1022-5528

VL - 42-43

SP - 203

EP - 207

JO - Topics in Catalysis

JF - Topics in Catalysis

IS - 1-4

ER -