化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (7) : 227-231.

科学研究

Al³⁺掺入对CeO₂(ZrO₂)/TiO₂催化剂脱硝性能的影响

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Influence of Al³⁺ on the performance of CeO₂(ZrO₂)/TiO₂ for selective catalytic reduction of NO

Jin Qijie^1,2, Pan Youchun^1,2, Tao Xingjun^1,2, Shen Yuesong^1,2, Zhu Shemin^1,2

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Received		Published
2017-03-16		2018-07-20
Issue Date	Revised Date
2018-08-07	2017-03-16

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摘要

采用溶胶-凝胶法制备Al³⁺掺杂CeO₂(ZrO₂)/TiO₂催化剂,研究了Al³⁺掺入对CeO₂(ZrO₂)/TiO₂催化剂脱硝性能的影响。采用X射线衍射、氮气吸附脱附、氨气程序升温吸附、氢气程序升温还原以及荧光光谱等表征技术对催化剂进行表征。结果表明:Al³⁺的掺入有利于抑制TiO₂从无定型相向锐钛矿相转变,增强了催化剂的储释氧性能,提高了催化剂的强酸酸量和缺陷浓度。强酸酸量和缺陷浓度的提高有利于反应气体的吸附;储释氧性能的增强,吸附的NO物种被氧化的速率加快,有利于催化反应的进行。因此,适量Al³⁺的掺入会明显提升CeO₂(ZrO₂)/TiO₂催化剂的高温脱硝活性,拓宽活性温度窗口。71400h^-1条件下0.8Al-CZT催化剂在330℃达到最高活性(98.9%)且在400℃脱硝活性依然能够维持90.8%。

Abstract

A series of CeO₂ (ZrO₂)/TiO₂ catalysts were modified with Al³⁺ using a sol-gel method.The effect of Al³⁺ on the catalytic performance of CeO₂ (ZrO₂)/TiO₂ for the selective catalytic reduction (SCR) of NO with NH₃ was investigated.The catalysts were characterized by XRD,N₂-BET,NH₃-TPD,H₂-TPR and PL spectra,respectively.Results showed that the addition of Al³⁺ could inhibit the transformation of TiO₂ from amorphous phase to anatase phase.In addition,Al³⁺ ions could increase the defects species concentration and the amount of strong acid sites,which was beneficial for the adsorption of reaction gas.The enhancement of oxygen storage capacity was good for catalytic activity.Therefore,the additions of Al³⁺ improved catalytic activity at the high temperature and broadened the active temperature window while the amount was appropriate.Under GHSV was 71400h^-1,0.8Al-CZT obtained the maximum activity (98.9%) at 330℃ and maintained 90.8% NO conversion at 400℃.

关键词

CeO₂(ZrO₂)/TiO₂ / 烟气脱硝 / 酸性位 / 溶胶-凝胶法

Key words

CeO₂ (ZrO₂)/TiO₂ / flue gas denitrification / acid site / sol-gel method

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Al³⁺掺入对CeO₂(ZrO₂)/TiO₂催化剂脱硝性能的影响[J]. 化工新型材料, 2018, 46(7): 227-231 DOI:

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