Low temperature de NO<sub>x</sub> activity of non-pitch coal-based activated-coke modified by CoCeNi

LI Yuan; LIU Jun; FU Yali; LU Yang; WEI Zheng; HAO Wuxing; ZHANG Yongfa

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Low temperature de NO_x activity of non-pitch coal-based activated-coke modified by CoCeNi

更新时间：2025-09-28

- Low temperature de NO_x activity of non-pitch coal-based activated-coke modified by CoCeNi
- Thermal Power Generation Vol. 46, Issue 9, Pages: 39-46(2017)
- 作者机构：
  
  太原理工大学煤科学与技术重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： X701
- Published：2017
- 稿件说明：
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LI Yuan, LIU Jun, FU Yali, et al. Low temperature de NO_x activity of non-pitch coal-based activated-coke modified by CoCeNi[J]. Thermal power generation, 2017, 46(9): 39-46.
DOI：

LI Yuan, LIU Jun, FU Yali, et al. Low temperature de NO_x activity of non-pitch coal-based activated-coke modified by CoCeNi[J]. Thermal power generation, 2017, 46(9): 39-46. DOI：

摘要

采用等体积浸渍法制备了系列CoCeNi改性非沥青基煤质活性焦(NPAC)催化剂

并结合N_2吸附、X射线衍射、X射线光电子能谱分析以及NH3程序升温脱附等表征技术

对3种金属单一负载和共负载后改性活性焦的低温NH_3-SCR脱硝活性进行了研究。结果表明:单一负载和共负载都可提高非沥青基煤质活性焦的低温脱硝活性

且共负载的脱硝能力较强;CoCeNi可以较好地并入NPAC的类石墨微晶结构

Ce、Co和Ni在负载改性NPAC表面分散均匀;Ce以Ce~(3+)和Ce~(4+)形式存在

但以Ce~(4+)为主

Co以Co~(2+)和Co~(3+)形式存在

Ni以Ni~(2+)和Ni~(3+)形式存在;金属负载改性使NPAC的化学吸附氧浓度增加

氧化NO能力和表面酸性增强

增加了NH_3吸附和活化能力

从而提高其低温脱硝能力。共负载改性NPAC在150℃脱硝率达到71.55%。

Abstract

A series of metals(Co

Ce and Ni) were introduced into non-pitch coal-based activated coke (NPAC) by isometric impregnation method to elevate the low-temperature activity of NH_3-SCR.The modified NPAC was characterized by N_2 adsorption

X-ray diffraction(XRD)

X-ray photoelectron spectroscopy(XPS) and NH_3-temperature programmed desorption(NH_3-TPD) techniques.The results show that

the low-temperature denitrification activity of both the single modified NPAC and co-modified NPAC was enhanced

and the comodified NPAC exhibited a stronger ability of denitrification.The cobalt

cerium and nickel species incorporated the graphite crystalline structure of the NPAC

and were dispersed uniformly in the surface of the NPAC.The existing forms of Ce in the surface of the modified NPAC were Ce~(3+) and Ce~(4+)

with Ce~(4+) as the major form

the existing forms of Co were Co~(2+) and Co~(3+)

and the existing forms of Ni were Ni~(2+) and Ni~(3+).The modification has improved the chemisorbed oxygen concentration and enhanced the surface acidity of the NPAC

which promoted the NO oxidation and enhanced the ammonia adsorption and activation capacity of the NPAC.The denitrification rate of the NPAC-CoCeNi-7 at 150 ℃ was as high as 71.55%.

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Low temperature de NOx activity of non-pitch coal-based activated-coke modified by CoCeNi

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Low temperature de NO_x activity of non-pitch coal-based activated-coke modified by CoCeNi