Sol-gel one-pot synthesis of efficient and environmentally friendly iron-based catalysts for NH_3-SCR

Zhao Kun; Meng Jipeng; Lu Jiangyin; He Yang; Huang Huizi; Tang Zhicheng; Zhen Xinping

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Sol-gel one-pot synthesis of efficient and environmentally friendly iron-based catalysts for NH_3-SCR

机译：溶胶-凝胶一锅法合成高效环保的NH_3-SCR铁基催化剂

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In current study, various pore-forming agents were employed for the synthesis of Fe-W-Ti catalysts via sol-gel one-pot approach, and the catalytic performance was investigated for selective catalytic reduction of NOx by ammonia (NH3-SCR). Among all the catalysts, Fe0.2W0.2Ti(U-0.03, urea-modification) catalyst exhibited more than 95% NOx conversion in range of 240-420 degrees C, and excellent performance of resistance to SO2 and H2O was observed with a slight decline of NOx conversion to 92%. The characterization results revealed that urea-modified catalyst possessed low crystallinity of TiO2 with particle size of 3.8 nm and the dispersion of Fe-W species was increased significantly, which could be ascribed to the high specific surface area (144.92 m(2)/g) and superior porous structure. The sufficient strong acid, the remarkable reducibility and the increase in the ratio of divalent iron & adsorbed oxygen may be responsible for the excellent catalytic activity. Moreover, a dramatic drop in the specific surface area and surface acidity of the hydrothermal aged catalyst was observed, and the active species also became agglomerated with FeWO4 solid solution. (C) 2018 Elsevier B.V. All rights reserved.

机译：在当前的研究中，采用各种成孔剂通过溶胶-凝胶一锅法合成Fe-W-Ti催化剂，并研究了用氨（NH3-SCR）选择性催化还原NOx的催化性能。在所有催化剂中，Fe0.2W0.2Ti（U-0.03，尿素改性）催化剂在240-420摄氏度范围内表现出超过95％的NOx转化率，并且观察到优异的抗SO2和H2O性能。 NOx转化率下降到92％。表征结果表明，尿素改性催化剂的TiO2结晶度低，粒径为3.8 nm，Fe-W物种的分散性显着增加，这归因于高比表面积（144.92 m（2）/ g ）和优越的多孔结构。足够的强酸，显着的还原性以及二价铁与吸附的氧的比例增加可能是导致优异的催化活性的原因。此外，观察到水热老化催化剂的比表面积和表面酸度急剧下降，并且活性物质也与FeWO 4固溶体团聚。（C）2018 Elsevier B.V.保留所有权利。

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来源
《Applied Surface Science》 |2018年第1期|454-461|共8页
作者
Zhao Kun; Meng Jipeng; Lu Jiangyin; He Yang; Huang Huizi; Tang Zhicheng; Zhen Xinping;
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作者单位

Xinjiang Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Oil & Gas Fine Chem, Urumqi 830046, Peoples R China;

Xinjiang Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Oil & Gas Fine Chem, Urumqi 830046, Peoples R China;

Xinjiang Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Oil & Gas Fine Chem, Urumqi 830046, Peoples R China;

Xinjiang Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Oil & Gas Fine Chem, Urumqi 830046, Peoples R China;

Xinjiang Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Oil & Gas Fine Chem, Urumqi 830046, Peoples R China;

Chinese Acad Sci, Lanzhou Inst Chem Phys, Natl Engn Res Ctr Fine Petrochem Intermediates, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Gansu, Peoples R China;

Xinjiang Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Oil & Gas Fine Chem, Urumqi 830046, Peoples R China;

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正文语种 eng
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关键词
Fe-W-Ti catalysts; NH3-SCR; Urea-modification; Low crystallinity; Hydrothermal aged;

机译：Fe-W-Ti催化剂;NH3-SCR;尿素改性;低结晶度;水热老化;

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Sol-gel one-pot synthesis of efficient and environmentally friendly iron-based catalysts for NH_3-SCR

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