Regeneration of commercial de-NOx SCR catalysts poisoned by K2O with (NH4)2SO4 solution

SHANG Xue-song; CHEN Jin-sheng; HU Gong-ren; HE Chi; LI Jian-rong; YU Xiao-wei

Volume 40 Issue 06

Jun. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(06): 750-756

SHANG Xue-song, CHEN Jin-sheng, HU Gong-ren, HE Chi, LI Jian-rong, YU Xiao-wei. Regeneration of commercial de-NOx SCR catalysts poisoned by K2O with (NH4)2SO4 solution[J]. Journal of Fuel Chemistry and Technology, 2012, 40(06): 750-756.

Citation:

SHANG Xue-song, CHEN Jin-sheng, HU Gong-ren, HE Chi, LI Jian-rong, YU Xiao-wei. Regeneration of commercial de-NO_x SCR catalysts poisoned by K₂O with (NH₄)₂SO₄ solution[J]. Journal of Fuel Chemistry and Technology, 2012, 40(06): 750-756.

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Regeneration of commercial de-NO_x SCR catalysts poisoned by K₂O with (NH₄)₂SO₄ solution

1.
Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;
2.
School of Chemical Engineering, Huaqiao University, Xiamen 361021, China

Received Date: 2011-09-23
Rev Recd Date: 2011-11-02
Publish Date: 2012-06-30

Abstract

Abstract

A commercial de-NO_x catalyst for selective catalytic reaction (SCR) poisoned by K₂O was regenerated with (NH₄)₂SO₄ solution. The poisoning was simulated by loading different concentrations of K₂O in the de-NO_x catalysts through wet impregnation with KNO₃ solution as the K₂O precursor. After regeneration with (NH₄)₂SO₄ solution, the poisoned catalysts exhibit effective activity under the simulated conditions of different space velocities and oxygen concentrations. The catalysts before and after regeneration were characterized by ion chromatogram (IC), nitrogen physical sorption, scanning electron microscope and energy dispersive atomic X-ray spectroscopy (SEM-Maps/EDX), and infrared spectroscopy (FT-IR). The results indicated that the regeneration process is effective to remove K₂O from the poisoned catalysts and to restore the active sites of V=O, while the surface substances and mechanical properties of the regenerated catalysts are not significantly influenced by the regeneration.
- selective catalytic reduction (SCR),
- catalyst,
- K₂O,
- poisoning,
- regeneration,
- (NH₄)₂SO₄ solution

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References(28)

References

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