Effect of calcination temperature on the structure and NO<sub><i>x</i></sub> adsorption-reduction performance of Fe modified hydrotalcite-based Pt/BaO/MgFeO catalyst

CHEN Ke; LI Bo; LÜ Gang; ZHU Yan-tao; SONG Chong-lin

Volume 44 Issue 12

Dec. 2016

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Article Navigation > Journal of Fuel Chemistry and Technology > 2016 > 44(12): 1502-1508

CHEN Ke, LI Bo, LÜ Gang, ZHU Yan-tao, SONG Chong-lin. Effect of calcination temperature on the structure and NOx adsorption-reduction performance of Fe modified hydrotalcite-based Pt/BaO/MgFeO catalyst[J]. Journal of Fuel Chemistry and Technology, 2016, 44(12): 1502-1508.

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CHEN Ke, LI Bo, LÜ Gang, ZHU Yan-tao, SONG Chong-lin. Effect of calcination temperature on the structure and NO_x adsorption-reduction performance of Fe modified hydrotalcite-based Pt/BaO/MgFeO catalyst[J]. Journal of Fuel Chemistry and Technology, 2016, 44(12): 1502-1508.

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Effect of calcination temperature on the structure and NO_x adsorption-reduction performance of Fe modified hydrotalcite-based Pt/BaO/MgFeO catalyst

Tianjin University State Key Laboratory of Engines, Tianjin 300072, China

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Corresponding author: songchonglin@tju.edu.cn
Received Date: 2016-05-30
Rev Recd Date: 2016-08-01

Available Online: 2021-01-23

Publish Date: 2016-12-10

Abstract

Abstract

In this paper, the iron-magnesium hydrotalcite-based catalysts with well dispersed noble metal for the lean NO_x trap (LNT) were prepared by co-precipitation and impregnation methods. The effects of different calcination temperatures on the catalyst structure and the adsorption-reduction performance for NO_x were investigated by analytical techniques. Results show that the crystalline structure of the catalysts remains stable when the calcination temperature is lower than 700℃. The sintering of the catalysts prepared and the conglobation of Pt particles appear on the catalyst surface after calcination at 800℃. With the increase in calcination temperature from 500 to 800℃, the desorption amounts of NO_x increases after an initial decrease, while the corresponding peak temperature show a marginal change. DRIFTs results indicate that the adsorbed NO_x species and the adsorption pathways over the catalyst after calcination at 800℃ differ from those at 500℃. The ratio of NH₃/N₂ released from the reduction of adsorbed NO_x species over the catalyst calcinated at 800℃ decreases in comparison with those calcinated at lower temperatures, which is responsible for the decrease in the NO_x conversion efficiency.
- hydrotalcite,
- LNT,
- NO_x,
- calcination,
- diesel engine

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References(23)

References

[1]	HAROLD M P.NO_x,storage and reduction in lean burn vehicle emission control:A catalytic engineer's playground[J].Curr Opin Chem Eng,2012,1(3):303-311. doi: 10.1016/j.coche.2012.02.002
[2]	MIDLAMMOHLER S,GUEZENNEC Y.Design,modeling,and validation of a flame reformer for LNT external by-pass regeneration[C].SAE Technical Paper No.2006-06-1367.
[3]	王坤静.水滑石负载钯催化剂的制备表征及应用[D].辽宁:大连理工大学,2013. WANG Kun-jing.Preparation,characterization and application of LDH supported palladium catalyst[D].Liaoning:Dalian University of Technology,2013.
[4]	WANG Z,YAN X,BI X,WANG L,ZHENG J,XIAO T,UMAR A,WANG Q.Lanthanum-promoted copper-based hydrotalcites derived mixed oxides for NO_x,adsorption,soot combustion and simultaneous NO_x-soot removal[J].Mater Res Bull,2014,51(2):119-127.
[5]	DAI F,MENG M,ZHA Y,LI Z,HU T,XIE Y,ZHANG J.Performance of Ce substituted hydrotalcite-derived mixed oxide catalysts Co_2.5Mg_0.5Al_1-x%Ce_x%O used for soot combustion and simultaneous NO_x-soot removal[J].Fuel Process Technol,2012,104(12):43-49.
[6]	LI Q,MENG M,XIAN H,TSUBAKI N,LI X,XIE Y,HU T,ZHANG J.Hydrotalcite-derived Mn_xMg_3-xAlO catalysts used for soot combustion,NO_x storage and simultaneous soot-NO_x removal[J].Environ Sci Technol,2010,44(12):4747-52. doi: 10.1021/es9033638
[7]	JABŁO ŃSKA M,PALOMARES A E,CHMIELARZ L.NO_x storage/reduction catalysts based on Mg/Zn/Al/Fe hydrotalcite-like materials[J].Chem Eng J,2013,231:273-280. doi: 10.1016/j.cej.2013.07.038
[8]	SHEN J,GUANG B,TU M,CHEN Y.Preparation and characterization of Fe/MgO catalysts obtained from hydrotalcite-like compounds[J].Catal Today,1996,30(1):77-82. https://www.researchgate.net/publication/229223193_Preparation_and_characterization_of_FeMgO_catalysts_obtained_from_hydrotalcite-like_compounds
[9]	KIM D H,CHIN Y H,MUNTEAN G G,YEZERETZ A,CURRIER N W,EPLING W S,CHEN H Y,HESS H,PEDEN C H F.Relationship of Pt particle size to the NO_x storage performance of thermally aged Pt/BaO/Al₂O₃ lean NO_x trap catalysts[J].Ind Eng Chem Res,2006,45(26):8815-8821. doi: 10.1021/ie060736q
[10]	党修湖.稀燃条件下氮氧化物存储还原催化剂老化工艺研究[D].天津:天津大学,2008. DANG Xiu-hu.Investigation of ageing strategies for NSR Materials Under Lean-burn condition[D].Tianjin:Tianjin University,2008.
[11]	NOVA I,CASTOLDI L,LIETTI L,TRONCONI E.NO_x adsorption study over Pt-Ba/alumina catalysts:FT-IR and pulse experiments[J].J Catal,2004,222(2):377-388. doi: 10.1016/j.jcat.2003.11.013
[12]	NOVA I,LIETTI L,FORZATTI P.Mechanistic aspects of the reduction of stored NO_x over Pt-Ba/Al₂O₃ lean NO_x trap systems[J].Catal Today,2008,136(1):128-135.
[13]	MAHZOUL H,BRILHAC J F,GILOT P.Experimental and mechanistic study of NO_x,adsorption over NO_x,trap catalysts[J].Appl Catal B:Environ,1999,20(1):47-55. doi: 10.1016/S0926-3373(98)00093-9
[14]	KAYHAN E,ANDONOVA S M,SENTÜRK G S,CHUSUEI C C,OZENSOY E.Fe Promoted NO_x storage materials:Structural properties and NO_x uptake[J].J Phys Chem C,2009,114(1):122-138.
[15]	LI Q,MENG M,TSUBAKI N,LI X,LI Z,XIE Y,HU T,ZHANG J.Performance of K-promoted hydrotalcite-derived CoMgAlO catalysts used for soot combustion,NO_x storage and simultaneous soot-NO_x removal[J].Appl Catal B:Environ,2009,91(1/2):406-415.
[16]	KAGAWA S,SHANGGUAN W F,TERAOKA Y.Simultaneous catalytic removal of NO_x and diesel soot particulates over ternary AB₂O₄ spinel-type oxides[J].Appl Catal B:Environ,1996,8:217-227. doi: 10.1016/0926-3373(95)00070-4
[17]	YU S,AMIRIDIS M D.In situ FTIR studies of the mechanism of NO_x storage and reduction on Pt/Ba/Al₂O₃ catalysts[J].Catal Today,2004,96(1):31-41. https://www.researchgate.net/publication/225596608_FT-IR_study_of_NO_X_storage_mechanism_over_PtBaOAl2O3_catalysts_Effect_of_the_Pt-BaO_interaction
[18]	MORANDI S,PRINETTO F,GHIOTTI G,LIVI M,VACCARI A.FT-IR investigation of NO_x,storage properties of Pt-Mg (Al) O and Pt/Cu-Mg (Al) O catalysts obtained from hydrotalcite compounds[J].Microporous Mesoporous Mater,2008,107(1/2):31-38. https://www.researchgate.net/profile/Sara_Morandi/citations?sorting=citationCount
[19]	PRINETTO F,GHIOTTI G,NOVA I,CASTOLDI L,LIETTI L,TRONCONI E,FORZATTI P.In situ FT-IR and reactivity study of NO_x storage over Pt/Ba/Al₂O₃ catalysts[J].Phys Chem Chem Phys,2003,5(20):4428-4434. doi: 10.1039/B305815H
[20]	YU S,KABIN K S,HAROLD M P,AMIRIDIS M D.Reactor and in situ FTIR studies of Pt/BaO/Al₂O₃ and Pd/BaO/Al₂O₃ NO_x storage and reduction (NSR) catalysts[J].Appl Catal B:Environ,2007,71(3/4):207-215.
[21]	YU J J,JIANG Z,ZHU L,HAO Z P,XU Z P.Adsorption/desorption studies of NO_x on well-mixed oxides derived from Co-Mg/Al Hydrotalcite-like compounds.[J].J Phys Chem B,2006,110(9):4291-4300. doi: 10.1021/jp056473f
[22]	PARTRIDGE W P,CHOI J S.NH₃ formation and utilization in regenerationof Pt/Ba/Al₂O₃ NO_x storage-reduction catalyst with H₂[J].Appl Catal B:Environ,2009,91(1/2):144-151.
[23]	PEREDA-AYO B,GONZÁLEZ-VELASCO J R,BURCH R,HARDACRE C,CHANSAI S.Regeneration mechanism of a Lean NO_x Trap (LNT) catalyst in the presence of NO investigated using isotope labelling techniques[J].J Catal,2012,285:177-186. doi: 10.1016/j.jcat.2011.09.028