Citation: HE Jie, FAN Yi-Ning. Dispersion and Acidity of Niobia on Nb₂O₅/γ-Al₂O₃[J]. Acta Physico-Chimica Sinica, ;2010, 26(03): 679-684. doi: 10.3866/PKU.WHXB20100233 shu

Dispersion and Acidity of Niobia on Nb₂O₅/γ-Al₂O₃

HE Jie ,
FAN Yi-Ning

1.
School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui Province, P. R. China; Key Laboratory of Mesoscopic Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China

Received Date: 28 August 2009
Available Online: 4 January 2010

Supported niobium pentoxide materials are effective catalysts for a variety of reactions. Nb2O5/γ-Al2O3 catalysts with different Nb2O5 loadings were prepared by aqueous solution impregnation using niobium oxalate as a precursor on γ-Al2O3. The samples were characterized with respect to the dispersion state of the niobium oxide species on γ-Al2O3 by X-ray power diffraction (XRD) and laser Raman spectroscopy (LRS). The nature of the surface acidity was investigated using Fourier-transform infrared spectroscopy of pyridine adsorption (Py-IR). The catalytic activity of the as-prepared catalysts was evaluated by the condensation reaction of iso-butene (IB) and iso-butyraldehyde (IBA) to form 2,5-dimethyl-2,4-hexadiene (DMHD). Results reveal that the dispersion capacity (ΓNb) of Nb on γ-Al2O3 is about 7.6 μmol·m-2. This value is almost identical to the density of the octahedral vacant sites of the preferentially exposed (110) plane (7.5 μmol·m-2) on the surface of the γ-Al2O3 support. Additionally, the“incorporated model”suggests that Nb5+ cations are located on the vacant sites of the (110) plane on γ-Al2O3. These results suggest that isolated niobia (NbOx) species are present and are bound to the surface of the γ-Al2O3 support through Nb—O—Al bonds at a loading well below that corresponding to monolayer dispersion. This is consistent with the result from LRS. The formation of isolated NbOx species, which binds to the surface of the support through Nb—O—Al bonds, causes a decrease in the amount of surface Lewis acid sites (LAS) on the Nb2O5/γ-Al2O3 catalysts. With an increase in Nb2O5 loading, polymeric NbOx species are formed by the Nb—O—Nb bridging of neighboring isolated NbOx species and Bronsted acid sites (BAS) are generated. We found that the catalytic activity towards the condensation reaction of IB and IBA to form DMHD increased because the amount and strength of the Bronsted acid sites increased as the number of polymeric niobia species increased. When the loading exceeds the monolayer dispersion capacity, the catalytic activity (turnover frequency (TOF) of DMHD) decreased because of the formation of the three-dimensional NbOx species. Additionally, the selectivity of DMHD decreased because of an increase in the strength of the Bronsted acid sites. We suggest that the strength of the Bronsted acid sites are related to the state of NbOx on the surface of the Nb2O5/γ-Al2O3 catalysts.
- Surface acidity,
- Nb2O5/γ-Al2O3,
- NbOx surface species,
- Olefin-aldehyde condensation
1. [1]
  Runzi Cao , Heng Shao , Xinjie Wang , Jian Wang , Enxiang Shang , Yang Li . Photocatalytic production of high-value-added fuels from biodegradable PBAT by Nb₂O₅/GCN heterojunction catalyst: Performance and mechanism. Chinese Chemical Letters, 2025, 36(7): 111029-. doi: 10.1016/j.cclet.2025.111029
2. [2]
  Ruizhi Duan , Xiaomei Wang , Panwang Zhou , Yang Liu , Can Li . The role of hydroxyl species in the alkaline hydrogen evolution reaction over transition metal surfaces. Acta Physico-Chimica Sinica, 2025, 41(9): 100111-0. doi: 10.1016/j.actphy.2025.100111
3. [3]
  Liuyun Chen , Wenju Wang , Tairong Lu , Xuan Luo , Xinling Xie , Kelin Huang , Shanli Qin , Tongming Su , Zuzeng Qin , Hongbing Ji . Soft template-induced deep pore structure of Cu/Al₂O₃ for promoting plasma-catalyzed CO₂ hydrogenation to DME. Acta Physico-Chimica Sinica, 2025, 41(6): 100054-0. doi: 10.1016/j.actphy.2025.100054
4. [4]
  Weihan Zhang , Menglu Wang , Ankang Jia , Wei Deng , Shuxing Bai . Surface Sulfur Species Influence Hydrogenation Performance of Palladium-Sulfur Nanosheets. Acta Physico-Chimica Sinica, 2024, 40(11): 2309043-0. doi: 10.3866/PKU.WHXB202309043
5. [5]
  Heng Chen , Longhui Nie , Kai Xu , Yiqiong Yang , Caihong Fang . Remarkable Photocatalytic H₂O₂ Production Efficiency over Ultrathin g-C₃N₄ Nanosheet with Large Surface Area and Enhanced Crystallinity by Two-Step Calcination. Acta Physico-Chimica Sinica, 2024, 40(11): 2406019-0. doi: 10.3866/PKU.WHXB202406019
6. [6]
  Lina Guo , Ruizhe Li , Chuang Sun , Xiaoli Luo , Yiqiu Shi , Hong Yuan , Shuxin Ouyang , Tierui Zhang . Effect of Interlayer Anions in Layered Double Hydroxides on the Photothermocatalytic CO₂ Methanation of Derived Ni-Al₂O₃ Catalysts. Acta Physico-Chimica Sinica, 2025, 41(1): 100002-0. doi: 10.3866/PKU.WHXB202309002
7. [7]
  Chuanming GUO , Kaiyang ZHANG , Yun WU , Rui YAO , Qiang ZHAO , Jinping LI , Guang LIU . Performance of MnO₂-0.39IrO_x composite oxides for water oxidation reaction in acidic media. Chinese Journal of Inorganic Chemistry, 2024, 40(6): 1135-1142. doi: 10.11862/CJIC.20230459
8. [8]
  Jingyi Xie , Qianxi Lü , Weizhen Qiao , Chenyu Bu , Yusheng Zhang , Xuejun Zhai , Renqing Lü , Yongming Chai , Bin Dong . Enhancing Cobalt―Oxygen Bond to Stabilize Defective Co₂MnO₄ in Acidic Oxygen Evolution. Acta Physico-Chimica Sinica, 2024, 40(3): 2305021-0. doi: 10.3866/PKU.WHXB202305021
9. [9]
  Xinlong WANG , Zhenguo CHENG , Guo WANG , Xiaokuen ZHANG , Yong XIANG , Xinquan WANG . Enhancement of the fragile interface of high voltage LiCoO₂ by surface gradient permeation of trace amounts of Mg/F. Chinese Journal of Inorganic Chemistry, 2024, 40(3): 571-580. doi: 10.11862/CJIC.20230259
10. [10]
  Yajuan Xing , Hui Xue , Jing Sun , Niankun Guo , Tianshan Song , Jiawen Sun , Yi-Ru Hao , Qin Wang . Cu₃P-Induced Charge-Oriented Transfer and Surface Reconstruction of Ni₂P to Achieve Efficient Oxygen Evolution Activity. Acta Physico-Chimica Sinica, 2024, 40(3): 2304046-0. doi: 10.3866/PKU.WHXB202304046
11. [11]
  Xingyang LI , Tianju LIU , Yang GAO , Dandan ZHANG , Yong ZHOU , Meng PAN . A superior methanol-to-propylene catalyst: Construction via synergistic regulation of pore structure and acidic property of high-silica ZSM-5 zeolite. Chinese Journal of Inorganic Chemistry, 2024, 40(7): 1279-1289. doi: 10.11862/CJIC.20240026
12. [12]
  Tieping CAO , Yuejun LI , Dawei SUN . Surface plasmon resonance effect enhanced photocatalytic CO₂ reduction performance of S-scheme Bi₂S₃/TiO₂ heterojunction. Chinese Journal of Inorganic Chemistry, 2025, 41(5): 903-912. doi: 10.11862/CJIC.20240366
13. [13]
  Hongyi LI , Aimin WU , Liuyang ZHAO , Xinpeng LIU , Fengqin CHEN , Aikui LI , Hao HUANG . Effect of Y(PO₃)₃ double-coating modification on the electrochemical properties of Li[Ni_0.8Co_0.15Al_0.05]O₂. Chinese Journal of Inorganic Chemistry, 2024, 40(7): 1320-1328. doi: 10.11862/CJIC.20230480
14. [14]
  Dong-Xue Jiao , Hui-Li Zhang , Chao He , Si-Yu Chen , Ke Wang , Xiao-Han Zhang , Li Wei , Qi Wei . Layered (C5H6ON)2[Sb2O(C2O4)3] with a large birefringence derived from the uniform arrangement of π-conjugated units. Chinese Journal of Structural Chemistry, 2024, 43(6): 100304-100304. doi: 10.1016/j.cjsc.2024.100304
15. [15]
  Yangrui Xu , Yewei Ren , Xinlin Liu , Hongping Li , Ziyang Lu . NH₂-UIO-66 Based Hydrophobic Porous Liquid with High Mass Transfer and Affinity Surface for Enhancing CO₂ Photoreduction. Acta Physico-Chimica Sinica, 2024, 40(11): 2403032-0. doi: 10.3866/PKU.WHXB202403032
16. [16]
  Cheng PENG , Jianwei WEI , Yating CHEN , Nan HU , Hui ZENG . First principles investigation about interference effects of electronic and optical properties of inorganic and lead-free perovskite Cs₃Bi₂X₉ (X=Cl, Br, I). Chinese Journal of Inorganic Chemistry, 2024, 40(3): 555-560. doi: 10.11862/CJIC.20230282
17. [17]
  Liyang ZHANG , Dongdong YANG , Ning LI , Yuanyu YANG , Qi MA . Crystal structures, luminescent properties and Hirshfeld surface analyses of three cadmium(Ⅱ) complexes based on 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)benzoate. Chinese Journal of Inorganic Chemistry, 2024, 40(10): 1943-1952. doi: 10.11862/CJIC.20240079
18. [18]
  Ping Lu , Baoyin Du , Ke Liu , Ze Luo , Abiduweili Sikandaier , Lipeng Diao , Jin Sun , Luhua Jiang , Yukun Zhu . Heterostructured In2O3/In2S3 hollow fibers enable efficient visible-light driven photocatalytic hydrogen production and 5-hydroxymethylfurfural oxidation. Chinese Journal of Structural Chemistry, 2024, 43(8): 100361-100361. doi: 10.1016/j.cjsc.2024.100361
19. [19]
  Juan Guo , Mingyuan Fang , Qingsong Liu , Xiao Ren , Yongqiang Qiao , Mingju Chao , Erjun Liang , Qilong Gao . Zero thermal expansion in Cs₂W₃O₁₀. Chinese Chemical Letters, 2024, 35(7): 108957-. doi: 10.1016/j.cclet.2023.108957
20. [20]
  Qing Li , Yumei Feng , Yuhua Xie , Qi Xu , Yifei Li , Yingjie Yu , Fang Luo , Zehui Yang . MOF derived RuO₂/V₂O₅ nanoneedles for robust and stable water oxidation in acid. Chinese Chemical Letters, 2025, 36(7): 111074-. doi: 10.1016/j.cclet.2025.111074

Get Citation

PDF

XML

Metrics

PDF Downloads(1276)
Abstract views(2327)
HTML views(21)

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Dispersion and Acidity of Niobia on Nb2O5/γ-Al2O3

Metrics

通讯作者: 陈斌, bchen63@163.com

Dispersion and Acidity of Niobia on Nb₂O₅/γ-Al₂O₃