New CeO2-TiO2, WO3-TiO2 and WO3-CeO2-TiO2 mesoporous aerogel catalysts for the low temperature selective catalytic reduction of NO by NH3

被引:15
作者
Arfaoui, Jihene [1 ]
Ghorbel, Abdelhamid [1 ]
Petitto, Carolina [2 ]
Delahay, Gerard [2 ]
机构
[1] Univ Tunis El Manar, Fac Sci Tunis, Dept Chim, Lab Chim Mat & Catalyse, Campus Univ Farhat Hached El Manar, Tunis 2092, Tunisia
[2] Univ Montpellier, CNRS, ICGM, ENSCM,MACS, Montpellier, France
关键词
Sol-gel method; Supercritical drying; Mesoporous materials; New WO3-CeO2-TiO2 aerogel catalyst; W <-> Ce interactions; NO-SCR by NH3; TUNGSTEN-OXIDE; NH3-SCR; SCR; MECHANISM; CERIA; TIO2; CEO2-WO3/TIO2;
D O I
10.1007/s10934-021-01102-3
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
New mesoporous and well-structured aerogel catalysts (CeO2-TiO2, WO3-TiO2 and WO3-CeO2-TiO2) were elaborated via the sol-gel method, characterized by means of various techniques (XRD; N-2-Physisorption at 77 K; NH3-TPD; H-2-TPR; DRUV-Vis spectroscopy) and evaluated in the selective catalytic reduction (SCR) of NO by NH3. The results reveal that all the aerogel catalysts develop essentially the diffraction peaks of TiO2 anatase phase and are classified as mesoporous materials with a high surface area (70 < S-BET < 106 m(2) g(-1)), large porosity (0.27 < V-PT < 0.46 cm(3) g(-1)) and nanometer size of crystallites (8-15 nm). The addition of Ce and/or W influences differently the structure, texture, crystallites size, surface oxygen concentration, total acidity and redox ability of aerogel samples and clearly affects their NO-SCR activity which follows this order: TiO2 < WO3-TiO2 < CeO2-TiO2 < WO3-CeO2-TiO2. It was also found that cerium species are more active in the low temperature NO-SCR reaction than tungsten ones (NO conversions obtained at 300 degrees C using CeO2-TiO2 and WO3-TiO2 were 75 and 0%, respectively). On the other hand, it was suggested that the interactions between Ce and W species play a key role in improving the reactivity of WO3-CeO2-TiO2 catalyst in the SCR of NO by NH3. Interestingly, the NO conversion into N-2 reaches 85% at 300 degrees C and exceeds 90% between 320 and 400 degrees C over this novel meso-structured aerogel catalyst.
引用
收藏
页码:1535 / 1543
页数:9
相关论文
共 55 条
[1]   New MoO3-CeO2-ZrO2 and WO3-CeO2-ZrO2 nanostructured mesoporous aerogel catalysts for the NH3-SCR of NO from diesel engine exhaust [J].
Arfaoui, Jihene ;
Ghorbel, Abdelhamid ;
Petitto, Carolina ;
Delahay, Gerard .
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 2021, 95 :182-189
[2]   New Mn-TiO2 aerogel catalysts for the low-temperature selective catalytic reduction of NOx [J].
Arfaoui, Jihene ;
Ghorbel, Abdelhamid ;
Petitto, Carolina ;
Delahay, Gerard .
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 2021, 97 (02) :302-310
[3]   A new V2O5-MoO3-TiO2-SO42- nanostructured aerogel catalyst for diesel DeNOx technology [J].
Arfaoui, Jihene ;
Ghorbel, Abdelhamid ;
Petitto, Carolina ;
Delahay, Gerard .
NEW JOURNAL OF CHEMISTRY, 2020, 44 (37) :16119-16134
[4]   Novel V2O5-CeO2-TiO2-SO42- nanostructured aerogel catalyst for the low temperature selective catalytic reduction of NO by NH3 in excess O2 [J].
Arfaoui, Jihene ;
Ghorbel, Abdelhamid ;
Petitto, Carolina ;
Delahay, Gerard .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2018, 224 :264-275
[5]   Metathesis of 2-butene to propylene over W-mesoporous molecular sieves: A comparative study between tungsten containing MCM-41 and SBA-15 [J].
Bhuiyan, Tazul Islam ;
Arudra, Palani ;
Akhtar, Muhammad Naseem ;
Aitani, Abdullah M. ;
Abudawoud, Raed H. ;
Al-Yami, Mohammed A. ;
Al-Khattaf, Sulaiman S. .
APPLIED CATALYSIS A-GENERAL, 2013, 467 :224-234
[6]   Low-temperature activity and mechanism of WO3-modified CeO2-TiO2 catalyst under NH3-NO/NO2 SCR conditions [J].
Chen, Lei ;
Weng, Ding ;
Wang, Jiadao ;
Weng, Duan ;
Cao, Li .
CHINESE JOURNAL OF CATALYSIS, 2018, 39 (11) :1804-1813
[7]   Synergistic effect between ceria and tungsten oxide on WO3-CeO2-TiO2 catalysts for NH3-SCR reaction [J].
Chen, Lei ;
Weng, Duan ;
Si, Zhichun ;
Wu, Xiaodong .
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL, 2012, 22 (04) :265-272
[8]   Mechanism of Selective Catalytic Reduction of NOx with NH3 over CeO2-WO3 Catalysts [J].
Chen Liang ;
Li Junhua ;
Ge Maofa ;
Ma Lei ;
Chang Huazhen .
CHINESE JOURNAL OF CATALYSIS, 2011, 32 (05) :836-841
[9]   Enhanced activity of tungsten modified CeO2/TiO2 for selective catalytic reduction of NOx with ammonia [J].
Chen, Liang ;
Li, Junhua ;
Ge, Maofa ;
Zhu, Ronghai .
CATALYSIS TODAY, 2010, 153 (3-4) :77-83
[10]   Promotional Effect of Ce-doped V2O5-WO3/TiO2 with Low Vanadium Loadings for Selective Catalytic Reduction of NOx by NH3 [J].
Chen, Liang ;
Li, Junhua ;
Ge, Maofa .
JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (50) :21177-21184