Synergy of CuO and CeO2 combination for mercury oxidation under low-temperature selective catalytic reduction atmosphere

Handle URI:
http://hdl.handle.net/10754/617281
Title:
Synergy of CuO and CeO2 combination for mercury oxidation under low-temperature selective catalytic reduction atmosphere
Authors:
Li, Hailong; Zhu, Lei; Wu, Shaokang; Liu, Yang; Shih, Kaimin
Abstract:
Synergy for low temperature Hg0 oxidation under selective catalytic reduction (SCR) atmosphere was achieved when copper oxides and cerium oxides were combined in a CuO-CeO2/TiO2 (CuCeTi) catalyst. Hg0 oxidation efficiency as high as 99.0% was observed on the CuCeTi catalyst at 200 °C, even the gas hourly space velocity was extremely high. To analyze the synergistic effect, comparisons of catalyst performance in the presence of different SCR reaction gases were systematically conducted over CuO/TiO2 (CuTi), CeO2/TiO2 (CeTi) and CuCeTi catalysts prepared by sol-gel method. The interactions between copper oxides and cerium oxides in CuCeTi catalyst yielded more surface chemisorbed oxygen, and facilitated the conversion of gas-phase O2 to surface oxygen, which are favorable for Hg0 oxidation. Copper oxides in the combination interacted with NO forming more chemisorbed oxygen for Hg0 oxidation in the absence of gas-phase O2. Cerium oxides in the combination promoted Hg0 oxidation through enhancing the transformations of NO to NO2. In the absence of NO, NH3 exhibited no inhibitive effect on Hg0 oxidation, because enough Lewis acid sites due to the combination of copper oxides and cerium oxides scavenged the competitive adsorption between NH3 and Hg0. In the presence of NO, although NH3 lowered Hg0 oxidation rate through inducing reduction of oxidized mercury, complete recovery of Hg0 oxidation activity over the CuCeTi catalyst was quickly achieved after cutting off NH3. This study revealed the synergistic effect of the combination of copper oxides and cerium oxides on Hg0 oxidation, and explored the involved mechanisms. Such knowledge would help obtaining maximum Hg0 oxidation co-benefit from SCR units in coal-fired power plants.
KAUST Department:
Advanced Membranes and Porous Materials Center (AMPMC)
Citation:
Synergy of CuO and CeO2 combination for mercury oxidation under low-temperature selective catalytic reduction atmosphere 2016 International Journal of Coal Geology
Publisher:
Elsevier BV
Journal:
International Journal of Coal Geology
Issue Date:
19-Jul-2016
DOI:
10.1016/j.coal.2016.07.011
Type:
Article
ISSN:
01665162
Sponsors:
This project was supported by the National Natural Science Foundation of China (NO. 51476189), the Hong Kong General Research Fund Scheme (No. 17206714), the Hong Kong Scholar Program (NO. XJ2014033), and the Key Research and Development Program of Hunan Province (No. 2015SK2007).
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0166516216303810
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, Hailongen
dc.contributor.authorZhu, Leien
dc.contributor.authorWu, Shaokangen
dc.contributor.authorLiu, Yangen
dc.contributor.authorShih, Kaiminen
dc.date.accessioned2016-07-21T08:55:07Z-
dc.date.available2016-07-21T08:55:07Z-
dc.date.issued2016-07-19-
dc.identifier.citationSynergy of CuO and CeO2 combination for mercury oxidation under low-temperature selective catalytic reduction atmosphere 2016 International Journal of Coal Geologyen
dc.identifier.issn01665162-
dc.identifier.doi10.1016/j.coal.2016.07.011-
dc.identifier.urihttp://hdl.handle.net/10754/617281-
dc.description.abstractSynergy for low temperature Hg0 oxidation under selective catalytic reduction (SCR) atmosphere was achieved when copper oxides and cerium oxides were combined in a CuO-CeO2/TiO2 (CuCeTi) catalyst. Hg0 oxidation efficiency as high as 99.0% was observed on the CuCeTi catalyst at 200 °C, even the gas hourly space velocity was extremely high. To analyze the synergistic effect, comparisons of catalyst performance in the presence of different SCR reaction gases were systematically conducted over CuO/TiO2 (CuTi), CeO2/TiO2 (CeTi) and CuCeTi catalysts prepared by sol-gel method. The interactions between copper oxides and cerium oxides in CuCeTi catalyst yielded more surface chemisorbed oxygen, and facilitated the conversion of gas-phase O2 to surface oxygen, which are favorable for Hg0 oxidation. Copper oxides in the combination interacted with NO forming more chemisorbed oxygen for Hg0 oxidation in the absence of gas-phase O2. Cerium oxides in the combination promoted Hg0 oxidation through enhancing the transformations of NO to NO2. In the absence of NO, NH3 exhibited no inhibitive effect on Hg0 oxidation, because enough Lewis acid sites due to the combination of copper oxides and cerium oxides scavenged the competitive adsorption between NH3 and Hg0. In the presence of NO, although NH3 lowered Hg0 oxidation rate through inducing reduction of oxidized mercury, complete recovery of Hg0 oxidation activity over the CuCeTi catalyst was quickly achieved after cutting off NH3. This study revealed the synergistic effect of the combination of copper oxides and cerium oxides on Hg0 oxidation, and explored the involved mechanisms. Such knowledge would help obtaining maximum Hg0 oxidation co-benefit from SCR units in coal-fired power plants.en
dc.description.sponsorshipThis project was supported by the National Natural Science Foundation of China (NO. 51476189), the Hong Kong General Research Fund Scheme (No. 17206714), the Hong Kong Scholar Program (NO. XJ2014033), and the Key Research and Development Program of Hunan Province (No. 2015SK2007).en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0166516216303810en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Coal Geology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Coal Geology, 19 July 2016. DOI: 10.1016/j.coal.2016.07.011en
dc.subjectMercury oxidationen
dc.subjectCopper oxideen
dc.subjectCerium oxideen
dc.subjectSelective catalytic reductionen
dc.titleSynergy of CuO and CeO2 combination for mercury oxidation under low-temperature selective catalytic reduction atmosphereen
dc.typeArticleen
dc.contributor.departmentAdvanced Membranes and Porous Materials Center (AMPMC)en
dc.identifier.journalInternational Journal of Coal Geologyen
dc.eprint.versionPost-printen
dc.contributor.institutionSchool of Energy Science and Engineering, Central South University, Changsha, 410083, Chinaen
dc.contributor.institutionDepartment of Civil Engineering, The University of Hong Kong, Hong Kong SAR, Chinaen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorLiu, Yangen
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