Selective catalytic reduction of nitric oxide with hydrogen on supported Pd: Enhancement by hydrogen spillover

Lifeng Wang; Chengyang Yin; Ralph T. Yang

doi:10.1016/j.apcata.2016.01.013

Selective catalytic reduction of nitric oxide with hydrogen on supported Pd: Enhancement by hydrogen spillover

Lifeng Wang
, Chengyang Yin
, Ralph T. Yang

Department of Chemical and Biological Engineering

University of Michigan, Ann Arbor

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

65 Scopus citations

Abstract

Two high-activity supported-Pd catalysts (Pd/V₂O₅/TiO₂/SBA-15 and Pd/V₂O₅/TiO₂/MCM-41) for selective catalytic reduction of NO with H₂ were studied. They differ only by the mesoporous-silica support: SBA-15 vs. MCM-41. Although the SBA-15 supported catalyst had a lower surface area, it showed a higher NO conversion (95% vs. 84%, at a high space velocity of 4.6 × 10⁴ 1/h). Two pieces of direct and related evidence are shown for the role of hydrogen spillover in enhancing the catalytic activities of these two catalysts. A comparison of hydrogen adsorption isotherms (via the Benson-Boudart method) show more spillover on the SBA-15 supported catalyst. The results from the transient kinetics experiments also showed that the amount of spiltover hydrogen stored on the Pd/V₂O₅/TiO₂/SBA-15 under dynamic reaction conditions was significantly higher than that on Pd/V₂O₅/TiO₂/MCM-41 (7.3 μmol/g vs. 2.1 μmol/g). Catalytic performance of the two catalysts for practical applications is reported. The favorable effect of hydrogen spillover on H₂-SCR could be used as a new strategy for improving the performance of noble-metal H₂-SCR catalysts.

Original language	English
Pages (from-to)	35-42
Number of pages	8
Journal	Applied Catalysis A: General
Volume	514
DOIs	https://doi.org/10.1016/j.apcata.2016.01.013
State	Published - Mar 25 2016

Keywords

H-SCR
Hydrogen spillover
Nitric oxide reduction
Pd-based catalysts
Selective catalytic reduction

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10.1016/j.apcata.2016.01.013

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title = "Selective catalytic reduction of nitric oxide with hydrogen on supported Pd: Enhancement by hydrogen spillover",

abstract = "Two high-activity supported-Pd catalysts (Pd/V2O5/TiO2/SBA-15 and Pd/V2O5/TiO2/MCM-41) for selective catalytic reduction of NO with H2 were studied. They differ only by the mesoporous-silica support: SBA-15 vs. MCM-41. Although the SBA-15 supported catalyst had a lower surface area, it showed a higher NO conversion (95\% vs. 84\%, at a high space velocity of 4.6 × 104 1/h). Two pieces of direct and related evidence are shown for the role of hydrogen spillover in enhancing the catalytic activities of these two catalysts. A comparison of hydrogen adsorption isotherms (via the Benson-Boudart method) show more spillover on the SBA-15 supported catalyst. The results from the transient kinetics experiments also showed that the amount of spiltover hydrogen stored on the Pd/V2O5/TiO2/SBA-15 under dynamic reaction conditions was significantly higher than that on Pd/V2O5/TiO2/MCM-41 (7.3 μmol/g vs. 2.1 μmol/g). Catalytic performance of the two catalysts for practical applications is reported. The favorable effect of hydrogen spillover on H2-SCR could be used as a new strategy for improving the performance of noble-metal H2-SCR catalysts.",

keywords = "H-SCR, Hydrogen spillover, Nitric oxide reduction, Pd-based catalysts, Selective catalytic reduction",

author = "Lifeng Wang and Chengyang Yin and Yang, \{Ralph T.\}",

year = "2016",

month = mar,

day = "25",

doi = "10.1016/j.apcata.2016.01.013",

language = "English",

volume = "514",

pages = "35--42",

journal = "Applied Catalysis A: General",

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TY - JOUR

T1 - Selective catalytic reduction of nitric oxide with hydrogen on supported Pd

T2 - Enhancement by hydrogen spillover

AU - Wang, Lifeng

AU - Yin, Chengyang

AU - Yang, Ralph T.

PY - 2016/3/25

Y1 - 2016/3/25

N2 - Two high-activity supported-Pd catalysts (Pd/V2O5/TiO2/SBA-15 and Pd/V2O5/TiO2/MCM-41) for selective catalytic reduction of NO with H2 were studied. They differ only by the mesoporous-silica support: SBA-15 vs. MCM-41. Although the SBA-15 supported catalyst had a lower surface area, it showed a higher NO conversion (95% vs. 84%, at a high space velocity of 4.6 × 104 1/h). Two pieces of direct and related evidence are shown for the role of hydrogen spillover in enhancing the catalytic activities of these two catalysts. A comparison of hydrogen adsorption isotherms (via the Benson-Boudart method) show more spillover on the SBA-15 supported catalyst. The results from the transient kinetics experiments also showed that the amount of spiltover hydrogen stored on the Pd/V2O5/TiO2/SBA-15 under dynamic reaction conditions was significantly higher than that on Pd/V2O5/TiO2/MCM-41 (7.3 μmol/g vs. 2.1 μmol/g). Catalytic performance of the two catalysts for practical applications is reported. The favorable effect of hydrogen spillover on H2-SCR could be used as a new strategy for improving the performance of noble-metal H2-SCR catalysts.

AB - Two high-activity supported-Pd catalysts (Pd/V2O5/TiO2/SBA-15 and Pd/V2O5/TiO2/MCM-41) for selective catalytic reduction of NO with H2 were studied. They differ only by the mesoporous-silica support: SBA-15 vs. MCM-41. Although the SBA-15 supported catalyst had a lower surface area, it showed a higher NO conversion (95% vs. 84%, at a high space velocity of 4.6 × 104 1/h). Two pieces of direct and related evidence are shown for the role of hydrogen spillover in enhancing the catalytic activities of these two catalysts. A comparison of hydrogen adsorption isotherms (via the Benson-Boudart method) show more spillover on the SBA-15 supported catalyst. The results from the transient kinetics experiments also showed that the amount of spiltover hydrogen stored on the Pd/V2O5/TiO2/SBA-15 under dynamic reaction conditions was significantly higher than that on Pd/V2O5/TiO2/MCM-41 (7.3 μmol/g vs. 2.1 μmol/g). Catalytic performance of the two catalysts for practical applications is reported. The favorable effect of hydrogen spillover on H2-SCR could be used as a new strategy for improving the performance of noble-metal H2-SCR catalysts.

KW - H-SCR

KW - Hydrogen spillover

KW - Nitric oxide reduction

KW - Pd-based catalysts

KW - Selective catalytic reduction

UR - https://www.scopus.com/pages/publications/84955489911

U2 - 10.1016/j.apcata.2016.01.013

DO - 10.1016/j.apcata.2016.01.013

M3 - Article

AN - SCOPUS:84955489911

SN - 0926-860X

VL - 514

SP - 35

EP - 42

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

ER -

Selective catalytic reduction of nitric oxide with hydrogen on supported Pd: Enhancement by hydrogen spillover

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