Al_2O_3 supported hybrid Pd-CeO_2 colloidal spheres and its enhanced catalytic performances for methane combustion
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摘要
Fabrication of novel nano-catalyst with improved activity and stability has been a hot topic in heterogeneous catalysis. Herein a novel approach was designed to synthesize Pd-CeO_2 colloidal assembled spheres(CASs) in one-pot fashion. The Pd clusters were encompassed by the CeO_2 nanocrystals with a high dispersity. Based on this hybrid structure, the Pd/ceria interface area can be greatly improved. After Pd-CeO_2 CASs was supported on γ-Al_2O_3, its catalytic activity for CH_4 combustion was evaluated. The result shows that Al_2O_3 supported Pd-CeO_2 CASs exhibits an improved catalytic activity and stability,compared to the Pd/CeO_2 catalyst prepared by impregnation method. The results of several characterization techniques indicate that the enhanced catalytic activity of Al_2O_3 supported Pd-CeO_2 CASs can be attributed to the more interfacial Pd-O-Ce species and the more surface active oxygen species.
Fabrication of novel nano-catalyst with improved activity and stability has been a hot topic in heterogeneous catalysis. Herein a novel approach was designed to synthesize Pd-CeO_2 colloidal assembled spheres(CASs) in one-pot fashion. The Pd clusters were encompassed by the CeO_2 nanocrystals with a high dispersity. Based on this hybrid structure, the Pd/ceria interface area can be greatly improved. After Pd-CeO_2 CASs was supported on γ-Al_2O_3, its catalytic activity for CH_4 combustion was evaluated. The result shows that Al_2O_3 supported Pd-CeO_2 CASs exhibits an improved catalytic activity and stability,compared to the Pd/CeO_2 catalyst prepared by impregnation method. The results of several characterization techniques indicate that the enhanced catalytic activity of Al_2O_3 supported Pd-CeO_2 CASs can be attributed to the more interfacial Pd-O-Ce species and the more surface active oxygen species.
Fabrication of novel nano-catalyst with improved activity and stability has been a hot topic in heterogeneous catalysis. Herein a novel approach was designed to synthesize Pd-CeO_2 colloidal assembled spheres(CASs) in one-pot fashion. The Pd clusters were encompassed by the CeO_2 nanocrystals with a high dispersity. Based on this hybrid structure, the Pd/ceria interface area can be greatly improved. After Pd-CeO_2 CASs was supported on γ-Al_2O_3, its catalytic activity for CH_4 combustion was evaluated. The result shows that Al_2O_3 supported Pd-CeO_2 CASs exhibits an improved catalytic activity and stability,compared to the Pd/CeO_2 catalyst prepared by impregnation method. The results of several characterization techniques indicate that the enhanced catalytic activity of Al_2O_3 supported Pd-CeO_2 CASs can be attributed to the more interfacial Pd-O-Ce species and the more surface active oxygen species.
引文
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26.Li KZ, Wang H, Wei YG, Liu MC.Preparation and characterization of Ce_(1-x)Fe_xO_2complex oxides and its catalytic activity for methane selective oxidation.J Rare Earths.2008;26:245.
27.Rocchini E, Vicario M, Llorca J, de Leitenburg C, Dolcetti G, Trovarelli A.Reduction ad oxygen storage behavior of noble metals supported on silicadoped ceria.J Catal.2002;211:407.
28.Trovarelli A.Catalytic properties of ceria and CeO_2-containing materials.Catal Rev.1996;38:439.
29.Cargnello M, Doan-Nguyen VVT, Gordon TR, Diaz RE, Stach EA, Gorte RJ, et al.Control of metal nanocrystal size reveals metal-support interface role in ceria catalysts.Science.2013;341:771.
30.Wang X, Liu CP, Li JQ, Zhen JG, Wang F, Zhang HJ.γ-Al_2O_3 supported Pd@CeO_2core@shell nanospheres:salting-out assisted growth and self-assembly, and their catalytic performance in CO oxidation.Chem Sci.2015;6:2877.
31.Wang X, Zhang YB, Song SY, Yang XG, Wang Z, Jin RC, et al.L-Arginine-triggered self-assembly of CeO_2 nanosheaths on palladium nanoparticles in water.Angew Chem Int Ed.2016;128:4618.
32.Gulyaev RV, Stadnichenko AI, Slavinskaya EM, Ivanova AS, Koscheev SV,Boronin AI.In situ preparation and investigation of Pd/CeO_2 catalysts for the low-temperature oxidation of CO.Appl Catal, A.2012;439-440:41.
33.Boronin AI, Slavinskaya EM, Danilova IG, Gulyaev RV, Amosov YI, Kuznetsov PA,et al.Investigation of palladium interaction with cerium oxide and its state in catalysts for low-temperature CO oxidation.Catal Today.2009;144:201.
34.Chang LH, Sasirekha N, Chen YW, Wang WJ.Preferential oxidation of CO in H_2stream over Au/MnO_2-CeO_2 catalysts.Ind Eng Chem Res.2006;45:4927.
35.Romeo M, Bak K, Fallah JE, Le Normand F, Hilaire L.XPS study of the reduction of cerium dioxide.Surf Interface Anal.1993;20:508.
36.Hu Z, Liu XF, Meng DM, Guo Y, Guo YL, Lu GZ.Effect of ceria crystal plane on the physicochemical and catalytic properties of Pd/ceria for CO and propane oxidation.ACS Catal.2016;6:2265.
37.Ma J, Lou Y, Cai YF, Zhao ZY, Wang L, Zhan WC, et al.The relationship between the chemical state of Pd species and the catalytic activity for methane combustion on Pd/CeO_2.Catal Sci Technol.2018;8:2567.
38.Wu X, Xu L, Weng D.The thermal stability and catalytic performance of Ce-Zr promoted Rh-Pd/γ-Al_2O_3 automotive catalysts.Appl Surf Sci.2004;221:375.
39.Wang B, Weng D, Wu XD, Ran R.Modification of Pd-Ce02 catalyst by different treatments:effect on the structure and CO oxidation activity.Appl Surf Sci.2011;257:3878.
40.Meng DM, Xu Q, Jiao YL, Guo Y, Guo YL, Wang L, et al.Spinel structured CoaMnbOx mixed oxide catalyst for the selective catalytic reduction of NO_x with NH3.Appl Catal, B.2018;221:652.
41.Zhu HQ, Qin ZF, Shan WJ, Shen WJ, Wang JG.Pd/CeO_2-TiO_2 catalyst for CO oxidation at low temperature:a TPR study with H_2 and CO as reducing agents.J Catal.2004;225:267.
2.Murata K, Mahara Y, Ohyama J, Yamamoto Y, Arai S, Satsuma A.The metal-support interaction concerning the particle size effect of Pd/Al_2O_3 on methane combustion.Angew Chem Int Ed.2017;56:15993.
3.Zhu GH, Han JY, Zemlyanov DY, Ribeiro FH.The turnover rate for the catalytic combustion of methane over palladium is not sensitive to the structure of the catalyst.J Am Chem Soc.2004; 126:9896.
4.Cargnello M, Delgado Jaen JJ, Hernández Garrido JC, Bakhmustky K, Montini T,Calvino Gamez JJ, et al.Exceptional activity for methane combustion over modular Pd@CeO_2 subunits on functionalized Al_2O_3.Science.2012;337:713.
5.Hu LH, Peng Q, Li YD.Selective synthesis of Co_3O_4 nanocrystal with different shape and crystal plane effect on catalytic property on methane combustion.J Am Chem Soc.2008; 130:16136.
6.Marchetti L, Forni L.Catalytic combustion of methane over perovskites.Appl Catal,B.1998;15:179.
7.Shen J, Hayer RE, Wu XX, Semagina N.100℃temperature reduction of wet methane combustion:highly active Pd-Ni/Al_2O_3 catalyst versus Pd/NiAl_2O_4.ACS Catal.2015;5:2916.
8.Zhan WC, He Q, Liu XF, Guo YL, Wang YQ, Wang L, et al.A sacrificial coating strategy toward enhancement of metal-support interaction for ultrastable Au nanocatalysts.J Am Chem Soc.2016;138:16130.
9.Zhan WC, Shu Y, Sheng YJ, Zhu HY, Guo YL, Wang L, et al.Surfactant-Assisted stabilization of Au colloids on solids for heterogeneous catalysis.Angew Chem Int Ed.2017;56:4494.
10.Yang XW, Gao Q, Zhao ZY, Guo YL, Guo Y, Wang L, et al.Surface tuning of noble metal doped perovskite oxide by synergistic effect of thermal treatment and acid etching:a new path to high-performance catalysts for methane combustion.Appl Catal, B.2018;239:373.
11.Zhou AB, Wang J, Wang H, Li H, Wang JQ, Shen MQ.Effect of active oxygen on the performance of Pt/CeO_2 catalysts for CO oxidation.J Rare Earths.2018;36:257.
12.Du LY, Wang WW, Yan H, Wang X, Jin Z, Song QS, et al.Copper-ceria sheets catalysts:effect of copper species on catalytic activity in CO oxidation reaction.J Rare Earths.2017;35:1186.
13.Colussi S, GayenA, Camellone MF, Boaro M, Llorca J, Fabris S, et al.Nanofaceted Pd-O sites in Pd-Ce surface superstructure:enhanced in activity catalytic combustion of methane.Angew Chem Int Ed.2009;48:8481.
14.ColussiS GayenA, Boaro M, Llorca J, Fabris S, Trovarelli A.Influence of different palladium precursors on the properties of solution-combustion-synthesized palladium/ceria catalysts for methane combustion.ChemCatChem.2015;7:2222.
15.Monai M, Montini T, Chen C, Fonda E, Gorte RJ, Fornasiero P.Methane catalytic combustion over hierachical Pd@CeO_2/Si-Al_2O_3:effect of presence of water.ChemCatChem.2015;7:2038.
16.Centi G.Supported palladium catalysts in environmental catalytic technologies for gaseous emissions.J Mol Catal.2001;173:287.
17.Guo GS, Lian K, Gu FB, Han DM, Wang ZH.Three dimensionally ordered macroporous Pd-LaMnO_3 self-regeneration catalysts for methane combustion.Chem Commun.2014;50:13575.
18.Gelin P, Primet M.Complete oxidation of methane at low temperature over noble metal based catalysts:a review.Appl Catal, B.2002;39:1.
19.Schwartz WR, Pfefferle LD.Combustion of methane over palladium-based catalysts:support interactions.J Phys Chem C.2012;116:8571.
20.Doomkamp C, Ponec V.The universal character of the Mars and Van Krevelen mechanism.J Mol Catal.2000; 162:19.
21.Hu Z, Qiu S, You Y, Guo Y, Guo YL, Wang L, et al.Hydrothermal synthesis of NiCeOx nanosheets and its application to the total oxidation of propane.Appl Catal, B.2018;225:110.
22.Hu Z, Wang Z, Guo Y, Guo YL, Wang L, Zhang JS, et al.Total oxidation of propane over a Ru/CeO_2 catalyst at low temperature.Environ Sci Technol.2018;52:9531.
23.Zhan WC Guo Y, GongXQ, Guo YL, Wang YQ, Lu GZ.Current status and perspectives of rare earth catalytic materials and catalysis.Chin J Catal.2014;35:1238.
24.Zhan WC, Yang SZ, Zhang PF, Guo YL, Lu GZ, Chisholm MF, et al.Incorporating rich mesoporosity into a ceria-based catalyst via mechanochemistry.Chem Mater.2017;29:7323.
25.Zheng YE, Li KZ, Wang H, Wang YH, Tian D, Wei YG, et al.Structure dependence and reaction mechanism of CO oxidation:a model study on macroporous CeO_2and CeO_2-ZrO_2 catalysts.J Catal.2016;344:365.
26.Li KZ, Wang H, Wei YG, Liu MC.Preparation and characterization of Ce_(1-x)Fe_xO_2complex oxides and its catalytic activity for methane selective oxidation.J Rare Earths.2008;26:245.
27.Rocchini E, Vicario M, Llorca J, de Leitenburg C, Dolcetti G, Trovarelli A.Reduction ad oxygen storage behavior of noble metals supported on silicadoped ceria.J Catal.2002;211:407.
28.Trovarelli A.Catalytic properties of ceria and CeO_2-containing materials.Catal Rev.1996;38:439.
29.Cargnello M, Doan-Nguyen VVT, Gordon TR, Diaz RE, Stach EA, Gorte RJ, et al.Control of metal nanocrystal size reveals metal-support interface role in ceria catalysts.Science.2013;341:771.
30.Wang X, Liu CP, Li JQ, Zhen JG, Wang F, Zhang HJ.γ-Al_2O_3 supported Pd@CeO_2core@shell nanospheres:salting-out assisted growth and self-assembly, and their catalytic performance in CO oxidation.Chem Sci.2015;6:2877.
31.Wang X, Zhang YB, Song SY, Yang XG, Wang Z, Jin RC, et al.L-Arginine-triggered self-assembly of CeO_2 nanosheaths on palladium nanoparticles in water.Angew Chem Int Ed.2016;128:4618.
32.Gulyaev RV, Stadnichenko AI, Slavinskaya EM, Ivanova AS, Koscheev SV,Boronin AI.In situ preparation and investigation of Pd/CeO_2 catalysts for the low-temperature oxidation of CO.Appl Catal, A.2012;439-440:41.
33.Boronin AI, Slavinskaya EM, Danilova IG, Gulyaev RV, Amosov YI, Kuznetsov PA,et al.Investigation of palladium interaction with cerium oxide and its state in catalysts for low-temperature CO oxidation.Catal Today.2009;144:201.
34.Chang LH, Sasirekha N, Chen YW, Wang WJ.Preferential oxidation of CO in H_2stream over Au/MnO_2-CeO_2 catalysts.Ind Eng Chem Res.2006;45:4927.
35.Romeo M, Bak K, Fallah JE, Le Normand F, Hilaire L.XPS study of the reduction of cerium dioxide.Surf Interface Anal.1993;20:508.
36.Hu Z, Liu XF, Meng DM, Guo Y, Guo YL, Lu GZ.Effect of ceria crystal plane on the physicochemical and catalytic properties of Pd/ceria for CO and propane oxidation.ACS Catal.2016;6:2265.
37.Ma J, Lou Y, Cai YF, Zhao ZY, Wang L, Zhan WC, et al.The relationship between the chemical state of Pd species and the catalytic activity for methane combustion on Pd/CeO_2.Catal Sci Technol.2018;8:2567.
38.Wu X, Xu L, Weng D.The thermal stability and catalytic performance of Ce-Zr promoted Rh-Pd/γ-Al_2O_3 automotive catalysts.Appl Surf Sci.2004;221:375.
39.Wang B, Weng D, Wu XD, Ran R.Modification of Pd-Ce02 catalyst by different treatments:effect on the structure and CO oxidation activity.Appl Surf Sci.2011;257:3878.
40.Meng DM, Xu Q, Jiao YL, Guo Y, Guo YL, Wang L, et al.Spinel structured CoaMnbOx mixed oxide catalyst for the selective catalytic reduction of NO_x with NH3.Appl Catal, B.2018;221:652.
41.Zhu HQ, Qin ZF, Shan WJ, Shen WJ, Wang JG.Pd/CeO_2-TiO_2 catalyst for CO oxidation at low temperature:a TPR study with H_2 and CO as reducing agents.J Catal.2004;225:267.