Ce-Mn mixed oxides supported on glass-fiber for low-temperature selective catalytic reduction of NO with NH₃

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• 作者：Le LI ((鏉?涔?) ; Yongfa DIAO ((鍒佹案鍙?) ; ^{diaoyongfa@dhu.edu.cn" class="auth_mail} ; Xin LIU ((鍒?閼?)
• 关键词：Mn-Ce mixed oxides ; glass-fiber ; NO ; low-temperature SCR by NH3 ; SO2 poisoning ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：May 2014
• 年：2014
• 卷：32
• 期：5
• 页码：409-415
• 全文大小：1357 K

文摘

Samples of cerium-manganese oxides supported on modified glass-fiber with different Ce/Mn molar ratios (Ce-Mn/GF) were prepared by an impregnation method and tested for low-temperature (80–180 °C) selective catalytic reduction (SCR) of NO with ammonia. This brand-new technology could remove NO and particles matter from coal-fired flue gas. The surface properties of the catalysts were examined by means of Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The experimental results showed that the catalyst with a Ce/Mn molar ratio of 0.2 obtained high activity of 87.4% NO conversion at 150 °C under a high space velocity of 50000 h⁻¹. Deactivation poisoned by SO₂ still occurred, but the Ce-Mn/GF(0.2) catalyst performed desirable tolerance to SO₂ with decreasing 50% in 40 min and then maintaining at about 30% NO conversion. Characterization results indicated that the excellent low-temperature catalytic activity was related to the high specific surface area, pore structure, and amorphous phase.