Enhanced CO catalytic oxidation over an Au-Pt alloy supported on TiO2 nanotubes: investigation of the hydroxyl and Au/Pt ratio influences

被引:32
作者
Li, Jing-Jing [1 ,2 ,3 ]
Zhu, Bao-Lin [4 ]
Wang, Gui-Chang [1 ,2 ]
Liu, Zun-Feng [3 ]
Huang, Wei-Ping [1 ,2 ]
Zhang, Shou-Min [1 ,2 ]
机构
[1] Nankai Univ, Coll Chem, Key Lab Adv Energy Mat Chem, Minist Educ, Tianjin 300071, Peoples R China
[2] Nankai Univ, Tianjin Key Lab Met & Mol Based Mat Chem, Tianjin 300071, Peoples R China
[3] Nankai Univ, Coll Pharm, State Key Lab Med Chem Biol, Tianjin 300071, Peoples R China
[4] Nankai Univ, Coll Chem, Natl Demonstrat Ctr Expt Chem Educ, Tianjin 300071, Peoples R China
基金
中国国家自然科学基金;
关键词
LOW-TEMPERATURE OXIDATION; PHOTOCATALYTIC ACTIVITY; PREFERENTIAL OXIDATION; AU/TIO2; CATALYSTS; NANOPARTICLES; METAL; GOLD; ADSORPTION; HYDROGEN; MECHANISM;
D O I
10.1039/c8cy01642a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Incorporating another transition metal into gold-based catalysts has been shown to be beneficial to their catalytic performance. To better understand the origin of this catalytic behavior, Au-Pt alloy catalysts supported on thermally stable TiO2 nanotubes (TiO2 SNTs) were prepared, and their structural properties, adsorption of CO, and catalytic activity for CO oxidation were investigated. The alloy structure was confirmed by STEM and UV-vis spectroscopy, and the Au-Pt alloy phase could enhance the metal-support interaction (MSI). The catalytic results and DFT analysis indicated that the Au-Pt/TiO2 SNTs calcined at 400 degrees C with an Au/Pt ratio = 5:1 had the best CO catalytic performance. Based on the XPS and DRIFT results, the synergetic effects between Au and Pt and the hydroxyl groups of the Au-Pt/TiO2 SNT catalysts played a vital role in the catalytic activity. The hydroxyls bonded onto the cationic Au can react with CO molecules adsorbed on the surface of Au or Pt NPs to form intermediates COOH. The accompanying density functional theory (DFT) calculation results also reveal the determining role of OH in Au-Pt/TiO2 SNT catalysts. A possible catalytic mechanism of the Au-Pt/TiO2 SNT catalysts with enhanced catalytic activity was also proposed.
引用
收藏
页码:6109 / 6122
页数:14
相关论文
共 55 条
[1]   Low-temperature CO oxidation properties and TEM/STEM observation of Au/γ-Fe2O3 catalysts [J].
Akita, Tomoki ;
Maeda, Yasushi ;
Kohyama, Masanori .
JOURNAL OF CATALYSIS, 2015, 324 :127-132
[2]   Synthesis and Characterization of Thermally Stable Nanotubular TiO2 and Its Photocatalytic Activity [J].
An, Huiqin ;
Zhu, Baolin ;
Li, Junxia ;
Zhou, Jian ;
Wang, Shurong ;
Zhang, Shoumin ;
Wu, Shihua ;
Huang, Weiping .
JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (48) :18772-18775
[3]   PROJECTOR AUGMENTED-WAVE METHOD [J].
BLOCHL, PE .
PHYSICAL REVIEW B, 1994, 50 (24) :17953-17979
[4]   FTIR study of CO oxidation on Au/TiO2 at 90 K and room temperature.: An insight into the nature of the reaction centers [J].
Boccuzzi, F ;
Chiorino, A .
JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (23) :5414-5416
[5]   Gold and gold-platinum as active and selective catalyst for biomass conversion:: Synthesis of γ-butyrolactone and one-pot synthesis of pyrrolidone [J].
Budroni, Gerolamo ;
Corma, Avelino .
JOURNAL OF CATALYSIS, 2008, 257 (02) :403-408
[6]   Novel synthesis of core-shell Au-Pt dendritic nanoparticles supported on carbon black for enhanced methanol electro-oxidation [J].
Cao, Ribing ;
Xia, Tiantian ;
Zhu, Ruizhi ;
Liu, Zhihua ;
Guo, Jinming ;
Chang, Gang ;
Zhang, Zaoli ;
Liu, Xiong ;
He, Yunbin .
APPLIED SURFACE SCIENCE, 2018, 433 :840-846
[7]   Facile Synthesis of AuPt Alloy Nanoparticles in Polyelectrolyte Multi layers with Enhanced Catalytic Activity for Reduction of 4-Nitrophenol [J].
Chu, Chengcan ;
Su, Zhaohui .
LANGMUIR, 2014, 30 (50) :15345-15350
[8]   Nature of the active site for CO oxidation on highly active Au/γ-Al2O3 [J].
Costello, CK ;
Kung, MC ;
Oh, HS ;
Wang, Y ;
Kung, HH .
APPLIED CATALYSIS A-GENERAL, 2002, 232 (1-2) :159-168
[9]   Bimetallic Pt-Metal catalysts for the decomposition of methanol: Effect of secondary metal on the oxidation state, activity, and selectivity of Pt [J].
Croy, Jason R. ;
Mostafa, S. ;
Hickman, L. ;
Heinrich, H. ;
Roldan Cuenya, B. .
APPLIED CATALYSIS A-GENERAL, 2008, 350 (02) :207-216
[10]  
Date M., 2004, ANGEW CHEM, V116, P2181, DOI DOI 10.1002/ANGE.200453796