The effects of hydrogen on the efficiency of NOx reduction via hydrocarbon-selective catalytic reduction (HC-SCR) at low temperature using various reductants

Hyerim Gu; Kwang Min Chun; Soonho Song

doi:10.1016/j.ijhydene.2015.05.070

The effects of hydrogen on the efficiency of NO_x reduction via hydrocarbon-selective catalytic reduction (HC-SCR) at low temperature using various reductants

Hyerim Gu, Kwang Min Chun, Soonho Song

Department of Mechanical Engineering

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

39 Citations (Scopus)

Abstract

Hydrocarbon-selective catalytic reduction (HC-SCR) is a deNO_x system for diesel engines, which uses onboard fuel as the reductant to simplify the system. However, HC-SCR is relatively inefficient at reducing NO_x, especially at low temperatures. Here we investigate improvements in the efficiency resulting from the addition of hydrogen. We investigated the effects of adding hydrogen on the efficiency of NO_x reduction via HC-SCR using various reductants. Tests were carried out using both laboratory experiments and an engine test-bench at temperatures below 315 °C, with a 2.5 wt.% high-dispersion Ag/Al₂O₃ catalyst. The hydrogen was introduced to maximize the efficiency of NO_x reduction at low temperatures (245-315 °C). In the laboratory tests, propene, heptane, and dodecane were used as reductants to determine the effects of different chain lengths and chemical structures. The effects of hydrogen addition on the gas-phase reaction of HC-SCR were also examined. The efficiency of NO_x reduction increased significantly following the addition of hydrogen. In particular, the effects of hydrogen addition were significantly influenced by characteristics of the fuel, including the chain length and the structure, and longer chains and a higher degree of saturation were found to be advantageous. Engine tests were carried out to verify the effects of longer hydrocarbons in the presence of hydrogen; we found a maximum NO_x reduction efficiency of 79% at 315 °C and 74% at 245 °C using diesel fuel as a reductant.

Original language	English
Pages (from-to)	9602-9610
Number of pages	9
Journal	International Journal of Hydrogen Energy
Volume	40
Issue number	30
DOIs	https://doi.org/10.1016/j.ijhydene.2015.05.070
Publication status	Published - 2015 Aug 10

Bibliographical note

Funding Information:
This work was supported by the Power Generation & Electricity Delivery Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy , Republic of Korea. (No. 20131010176B ). And the authors would like to thank Heesung Catalyst Corp. for providing the catalysts.

Publisher Copyright:
© 2015 Hydrogen Energy Publications, LLC.

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2015.05.070

Cite this

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title = "The effects of hydrogen on the efficiency of NOx reduction via hydrocarbon-selective catalytic reduction (HC-SCR) at low temperature using various reductants",

abstract = "Hydrocarbon-selective catalytic reduction (HC-SCR) is a deNOx system for diesel engines, which uses onboard fuel as the reductant to simplify the system. However, HC-SCR is relatively inefficient at reducing NOx, especially at low temperatures. Here we investigate improvements in the efficiency resulting from the addition of hydrogen. We investigated the effects of adding hydrogen on the efficiency of NOx reduction via HC-SCR using various reductants. Tests were carried out using both laboratory experiments and an engine test-bench at temperatures below 315 °C, with a 2.5 wt.% high-dispersion Ag/Al2O3 catalyst. The hydrogen was introduced to maximize the efficiency of NOx reduction at low temperatures (245-315 °C). In the laboratory tests, propene, heptane, and dodecane were used as reductants to determine the effects of different chain lengths and chemical structures. The effects of hydrogen addition on the gas-phase reaction of HC-SCR were also examined. The efficiency of NOx reduction increased significantly following the addition of hydrogen. In particular, the effects of hydrogen addition were significantly influenced by characteristics of the fuel, including the chain length and the structure, and longer chains and a higher degree of saturation were found to be advantageous. Engine tests were carried out to verify the effects of longer hydrocarbons in the presence of hydrogen; we found a maximum NOx reduction efficiency of 79% at 315 °C and 74% at 245 °C using diesel fuel as a reductant.",

author = "Hyerim Gu and Chun, {Kwang Min} and Soonho Song",

note = "Funding Information: This work was supported by the Power Generation & Electricity Delivery Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy , Republic of Korea. (No. 20131010176B ). And the authors would like to thank Heesung Catalyst Corp. for providing the catalysts. Publisher Copyright: {\textcopyright} 2015 Hydrogen Energy Publications, LLC.",

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N1 - Funding Information: This work was supported by the Power Generation & Electricity Delivery Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy , Republic of Korea. (No. 20131010176B ). And the authors would like to thank Heesung Catalyst Corp. for providing the catalysts. Publisher Copyright: © 2015 Hydrogen Energy Publications, LLC.

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N2 - Hydrocarbon-selective catalytic reduction (HC-SCR) is a deNOx system for diesel engines, which uses onboard fuel as the reductant to simplify the system. However, HC-SCR is relatively inefficient at reducing NOx, especially at low temperatures. Here we investigate improvements in the efficiency resulting from the addition of hydrogen. We investigated the effects of adding hydrogen on the efficiency of NOx reduction via HC-SCR using various reductants. Tests were carried out using both laboratory experiments and an engine test-bench at temperatures below 315 °C, with a 2.5 wt.% high-dispersion Ag/Al2O3 catalyst. The hydrogen was introduced to maximize the efficiency of NOx reduction at low temperatures (245-315 °C). In the laboratory tests, propene, heptane, and dodecane were used as reductants to determine the effects of different chain lengths and chemical structures. The effects of hydrogen addition on the gas-phase reaction of HC-SCR were also examined. The efficiency of NOx reduction increased significantly following the addition of hydrogen. In particular, the effects of hydrogen addition were significantly influenced by characteristics of the fuel, including the chain length and the structure, and longer chains and a higher degree of saturation were found to be advantageous. Engine tests were carried out to verify the effects of longer hydrocarbons in the presence of hydrogen; we found a maximum NOx reduction efficiency of 79% at 315 °C and 74% at 245 °C using diesel fuel as a reductant.

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