2/H2O性能的影響。并通過XRD、BET、H2-TPR、NH3-TPD、XPS等手段對(duì)催化劑的結(jié)構(gòu)和物理化學(xué)特性進(jìn)行了表征。結(jié)果表明，La摻雜降低了MnOx的結(jié)晶度，增大了催化劑的比表面積和孔體積。Mn-O-La鍵合作用促進(jìn)了錳在催化劑表面的分散，而高分散的錳更容易被還原，催化劑的還原溫度向低溫方向遷移，氧化還原能力得到提高。摻雜La之后，催化劑表面Br?nsted酸和總酸量增加，同時(shí)Mn4+和表面化學(xué)吸附氧的濃度也得到提高。因此，La摻雜有利于促進(jìn)催化劑的脫硝活性。反應(yīng)評(píng)價(jià)結(jié)果表明，共沉淀法制備的MnLa-CPM催化劑表現(xiàn)出最佳的脫硝效率，在80 ℃時(shí)脫硝效率接近100%。在H2O和SO2存在的條件下，MnLa-CPM催化劑的脫硝效率仍能達(dá)到80%，表現(xiàn)出了較好的抗硫水性能。"/>

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制備方法對(duì)低溫NH3-SCR催化劑Mn-La結(jié)構(gòu)與性能的影響
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作者單位:

1.中國(guó)建筑材料科學(xué)研究總院 陶瓷科學(xué)研究院，北京 100024;2.萍鄉(xiāng)學(xué)院 江西省工業(yè)陶瓷重點(diǎn)實(shí)驗(yàn)室，江西 萍鄉(xiāng) 337055

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基金項(xiàng)目:

NSFC(21866026)


Effect of Preparation Methods on Structure and Properties of Mn-La Catalyst for Low Temperature NH3-SCR
Author:
Affiliation:

1.Ceramics Science Institute, China Building Materials Academy, Beijing 100024, China;2.Jiangxi Provincial Key Laboratory of Industrial Ceramics, Pingxiang University, Pingxiang 337055, China

Fund Project:

National Key R&D Program of China (2016YFC0209302); National Natural Science Foundation of China (21866026, 51702308)

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    摘要:

    采用固相反應(yīng)法、共沉淀法制備了Mn-La復(fù)合氧化物催化劑，考察了制備方法對(duì)催化劑脫硝性能及抗SO2/H2O性能的影響。并通過XRD、BET、H2-TPR、NH3-TPD、XPS等手段對(duì)催化劑的結(jié)構(gòu)和物理化學(xué)特性進(jìn)行了表征。結(jié)果表明，La摻雜降低了MnOx的結(jié)晶度，增大了催化劑的比表面積和孔體積。Mn-O-La鍵合作用促進(jìn)了錳在催化劑表面的分散，而高分散的錳更容易被還原，催化劑的還原溫度向低溫方向遷移，氧化還原能力得到提高。摻雜La之后，催化劑表面Br?nsted酸和總酸量增加，同時(shí)Mn4+和表面化學(xué)吸附氧的濃度也得到提高。因此，La摻雜有利于促進(jìn)催化劑的脫硝活性。反應(yīng)評(píng)價(jià)結(jié)果表明，共沉淀法制備的MnLa-CPM催化劑表現(xiàn)出最佳的脫硝效率，在80 ℃時(shí)脫硝效率接近100%。在H2O和SO2存在的條件下，MnLa-CPM催化劑的脫硝效率仍能達(dá)到80%，表現(xiàn)出了較好的抗硫水性能。

    Abstract:

    Mn-La catalysts were prepared by solid-state reaction (SSR) and co-precipitation methods (CPM). The effects of preparation methods on denitration and SO2/H2O resistance of the catalysts were investigated. The structure and physicochemical properties of the catalysts were characterized by XRD, BET, H2-TPR, NH3-TPD and XPS. The results show that La doping decreases the crystallinity of MnOx and increases the specific surface area and pore volume of MnOx. The bond cooperation of Mn-O-La promotes the dispersion of Mn on the catalyst surface, while the highly dispersed Mn are easier to be reduced. The reduction temperature of the catalyst moves to lower temperature, and the redox ability is improved. After La doping, the amount of Br?nsted acid and total acid increase on the catalyst surface, and the concentration of Mn4+ and the surface chemisorption oxygen also increase. Therefore, La doping is beneficial to the denitration activity of the catalyst. The results of reaction evaluation show that MnLa-CPM catalyst exhibits the best denitration efficiency, which is close to 100% at 80 °C. In the presence of H2O and SO2, the denitration efficiency of MnLa-CPM catalyst can still reach 80%, showing good SO2/H2O resistance performance.

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吳彥霞,梁海龍,陳鑫,王獻(xiàn)忠,陳玉峰.制備方法對(duì)低溫NH3-SCR催化劑Mn-La結(jié)構(gòu)與性能的影響[J].稀有金屬材料與工程,2021,50(12):4256~4264.[Wu Yanxia, Liang Hailong, Chen Xin, Wang Xianzhong, Chen Yufeng. Effect of Preparation Methods on Structure and Properties of Mn-La Catalyst for Low Temperature NH3-SCR[J]. Rare Metal Materials and Engineering,2021,50(12):4256~4264.]
DOI：10.12442/j. issn.1002-185X.20200743

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  • 收稿日期:2020-09-23
  • 最后修改日期:2020-11-16
  • 錄用日期:2020-12-14
  • 在線發(fā)布日期: 2021-12-30
  • 出版日期: 2021-12-24