Mn promoted Pd/TiO2-Al2O3 catalyst for the selective catalytic reduction of NOx by H2

Kaijiao Duan; Biaohua Chen; Tianle Zhu; Zhiming Liu

doi:10.1016/j.apcatb.2015.04.048

Mn promoted Pd/TiO₂-Al₂O₃ catalyst for the selective catalytic reduction of NO_x by H₂

Kaijiao Duan
, Biaohua Chen
, Tianle Zhu
, Zhiming Liu^*

^*Corresponding author for this work

School of Materials Science and Engineering

Beijing University of Chemical Technology

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

66 Scopus citations

Abstract

The performances of Mn modified Pd/TiO₂-Al₂O₃ catalysts for the selective catalytic reduction of NO_x by H₂ (H₂-SCR) were investigated in this study. The added Mn not only enhanced the activity but also remarkably increased N₂ selectivity above 150°C. Based on the characterization, it was found that Pd was present in the form of PdO and the synergetic effect between Pd and Mn led to more NO_x adsorbed and activated over Mn promoted Pd/TiO₂-Al₂O₃ catalyst. In situ DRIFTS studies demonstrated that the addition of Mn resulted in new types of adsorbed nitrite and nitrate species formed, both of which are reactive in the H₂-SCR process. Moreover, NH₃ and NH_x (x=0-2) species adsorbed on Lewis acid sites were dominantly present instead of NH₄⁺ species on Brønsted acid sites over the Mn modified Pd/TiO₂-Al₂O₃ catalyst. Therefore, the H₂-SCR of NO_x reaction was facilitated to proceed following the well-established NH₃-SCR reaction route.

Original language	English
Pages (from-to)	618-626
Number of pages	9
Journal	Applied Catalysis B: Environmental
Volume	176-177
DOIs	https://doi.org/10.1016/j.apcatb.2015.04.048
State	Published - 1 Oct 2015

Keywords

H-SCR
Nitrogen oxide
Pd-Mn catalyst

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10.1016/j.apcatb.2015.04.048

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@article{8a49a2b13b7a4192a63a1cbc09ec7953,

title = "Mn promoted Pd/TiO2-Al2O3 catalyst for the selective catalytic reduction of NOx by H2",

abstract = "The performances of Mn modified Pd/TiO2-Al2O3 catalysts for the selective catalytic reduction of NOx by H2 (H2-SCR) were investigated in this study. The added Mn not only enhanced the activity but also remarkably increased N2 selectivity above 150°C. Based on the characterization, it was found that Pd was present in the form of PdO and the synergetic effect between Pd and Mn led to more NOx adsorbed and activated over Mn promoted Pd/TiO2-Al2O3 catalyst. In situ DRIFTS studies demonstrated that the addition of Mn resulted in new types of adsorbed nitrite and nitrate species formed, both of which are reactive in the H2-SCR process. Moreover, NH3 and NHx (x=0-2) species adsorbed on Lewis acid sites were dominantly present instead of NH4+ species on Br{\o}nsted acid sites over the Mn modified Pd/TiO2-Al2O3 catalyst. Therefore, the H2-SCR of NOx reaction was facilitated to proceed following the well-established NH3-SCR reaction route.",

keywords = "H-SCR, Nitrogen oxide, Pd-Mn catalyst",

author = "Kaijiao Duan and Biaohua Chen and Tianle Zhu and Zhiming Liu",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

month = oct,

day = "1",

doi = "10.1016/j.apcatb.2015.04.048",

language = "英语",

volume = "176-177",

pages = "618--626",

journal = "Applied Catalysis B: Environmental",

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TY - JOUR

T1 - Mn promoted Pd/TiO2-Al2O3 catalyst for the selective catalytic reduction of NOx by H2

AU - Duan, Kaijiao

AU - Chen, Biaohua

AU - Zhu, Tianle

AU - Liu, Zhiming

PY - 2015/10/1

Y1 - 2015/10/1

N2 - The performances of Mn modified Pd/TiO2-Al2O3 catalysts for the selective catalytic reduction of NOx by H2 (H2-SCR) were investigated in this study. The added Mn not only enhanced the activity but also remarkably increased N2 selectivity above 150°C. Based on the characterization, it was found that Pd was present in the form of PdO and the synergetic effect between Pd and Mn led to more NOx adsorbed and activated over Mn promoted Pd/TiO2-Al2O3 catalyst. In situ DRIFTS studies demonstrated that the addition of Mn resulted in new types of adsorbed nitrite and nitrate species formed, both of which are reactive in the H2-SCR process. Moreover, NH3 and NHx (x=0-2) species adsorbed on Lewis acid sites were dominantly present instead of NH4+ species on Brønsted acid sites over the Mn modified Pd/TiO2-Al2O3 catalyst. Therefore, the H2-SCR of NOx reaction was facilitated to proceed following the well-established NH3-SCR reaction route.

AB - The performances of Mn modified Pd/TiO2-Al2O3 catalysts for the selective catalytic reduction of NOx by H2 (H2-SCR) were investigated in this study. The added Mn not only enhanced the activity but also remarkably increased N2 selectivity above 150°C. Based on the characterization, it was found that Pd was present in the form of PdO and the synergetic effect between Pd and Mn led to more NOx adsorbed and activated over Mn promoted Pd/TiO2-Al2O3 catalyst. In situ DRIFTS studies demonstrated that the addition of Mn resulted in new types of adsorbed nitrite and nitrate species formed, both of which are reactive in the H2-SCR process. Moreover, NH3 and NHx (x=0-2) species adsorbed on Lewis acid sites were dominantly present instead of NH4+ species on Brønsted acid sites over the Mn modified Pd/TiO2-Al2O3 catalyst. Therefore, the H2-SCR of NOx reaction was facilitated to proceed following the well-established NH3-SCR reaction route.

KW - H-SCR

KW - Nitrogen oxide

KW - Pd-Mn catalyst

UR - https://www.scopus.com/pages/publications/84937920746

U2 - 10.1016/j.apcatb.2015.04.048

DO - 10.1016/j.apcatb.2015.04.048

M3 - 文章

AN - SCOPUS:84937920746

SN - 0926-3373

VL - 176-177

SP - 618

EP - 626

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

ER -

Mn promoted Pd/TiO₂-Al₂O₃ catalyst for the selective catalytic reduction of NO_x by H₂

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Keywords

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