Development of Metal Oxide Materials for Rapid and Reversible DeNOx by Absorption into Solid Phase
固相吸收快速可逆脱硝金属氧化物材料的开发
基本信息
- 批准号:07555198
- 负责人:
- 金额:$ 5.44万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (A)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1997
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The scope of this research is to develop a new solid absorbent capable for rapid and reversible deNOx of exhaust gases containing dilute nitrogen oxides in the presence of coexisting gases such as O_2, CO_2, and H_2O at high concentrations.We have discovered excellent ability of MnO_y-ZrO_2 and Pt-ZrO_2-Al_2O_3 mixed metal oxides as solid absorbents for deNOx in the presence of a large amount of oxygen. The highest capability for NOx absorption was found on MnO_y-ZrO_2, which demonstrated complete elimination of NOx as dilute as 75 ppm.DeNOx was rapid and reversible, being easily repeated with high reproducibility by heating or changing the atmosphere from oxidizing to reducing. The plausible mechanism of NOx absorption is oxidation of NO at the Mn site followed by absorption of NO_2 into solid phase via formation of metal (Zr) nitrate. Because the mixed oxide contains no alkali or alkaline earth metals, coexisting CO_2 and H_2O had no influence on the deNOx ability of the material. Th … More e major species desorbed from MnO_y-ZrO_2 were NO and NO_2, while they also contained a substantial amount of N_2 and N_2O when exposed to the reducing atmosphere by use of reducing agents such as C_3H_8 and C_2H_5OH.Moreover, Pt-ZrO_2-Al_2O_3 was also found to be capable for reversible NOx absorption. Desorbed species from Pt-ZrO_2-Al_2O_3 under the reducing atmosphere was revealed to consist of as much as 70% of N_2, indicating that selective reduction of desorbing NOx is significant on the Pt catalyst supported on the absorbent. Furthermore, Pt-ZrO_2-Al_2O_3 was revealed to be highly tolerant to SOx in contrast to MnO_y-ZrO_2, whose deNOx capacity gradually decreased by repeated operation in the presence of SO_2.In conclusion, the metal oxide-based absorbents investigated in the present research were confirmed to be capable for rapid and completely reversible absorption of dilute NOx into solid phase at relatively low temperature such as 300゚C in the presence of O_2, CO_2, and H_2O.The sorption-desorption of NOx can be cycled by elevating temperature or changing the atmosphere from oxidizing to reducing, resulting in releasing NOx having concentrated in the solid absorbents. Less
本研究的目的是开发一种新型的固体吸收剂,能够在高浓度O_2、CO_2和H_2O共存的条件下,快速、可逆地脱除含有稀氮氧化物的废气中的NOx,我们发现MnO_y-ZrO_2和Pt-ZrO_2-Al_2O_3复合金属氧化物作为固体吸收剂,在大量氧气存在下具有优良的脱硝性能。MnO_y-ZrO_2对NOx的吸收能力最强,在75 ppm的稀溶液中即可完全去除NOx,脱硝反应快速、可逆,通过加热或将气氛由氧化性转变为还原性,脱硝反应重复性好。NOx吸收的可能机理是NO在Mn位氧化,然后通过金属(Zr)硝酸盐的形成将NO_2吸收到固相中。由于复合氧化物中不含碱金属和碱土金属,CO_2和H_2O的共存对材料的脱硝性能没有影响。日 ...更多信息 MnO_y-ZrO_2-Al_2O_3在还原性气氛中脱附的主要物质为NO和NO_2,但也含有大量的N_2和N_2O。此外,Pt-ZrO_2-Al_2O_3还具有可逆吸收NOx的能力。在还原气氛下,Pt-ZrO_2-Al_2O_3催化剂的脱附物种中N_2的含量高达70%,表明脱附NOx在Pt/Al_2O_3催化剂上具有明显的选择性还原作用。Pt-ZrO_2-Al_2O_3对SO_2有很好的耐受性,而MnO_y-ZrO_2在SO_2的存在下,其脱硝能力随着重复运行而逐渐降低。金属氧化物-在本研究中研究的基于吸收剂被证实能够在相对较低的温度如300 ℃下将稀NOx快速且完全可逆地吸收到固相中在O_2、CO_2和H_2O存在下,通过升高温度或将气氛由氧化性转变为还原性,可以实现NOx的吸附-脱附循环,释放出富集在固体吸附剂中的NOx。少
项目成果
期刊论文数量(19)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
K.Eguchi, T.Kondo, T.Hayashi, H.Arai: "Sorption of Nitrogen Oxides on MnO_y-ZrO_2 and Pt-ZrO_2-Al_2O_3" Applied Catalysis,B:Environmental. (印刷中). (1998)
K.Eguchi、T.Kondo、T.Hayashi、H.Arai:“MnO_y-ZrO_2 和 Pt-ZrO_2-Al_2O_3 上氮氧化物的吸附”,应用催化,B:环境(1998 年出版)。
- DOI:
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- 影响因子:0
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- 通讯作者:
K.Eguchi, T.Hayashi: "Reversible Sorption-desorption of NO_x by Mixed Oxides under Various Atmospheres" Proc.Japan-EU Joint Workshop on the Frontiers of Catal.Sci.and Tech.for Energy,Environment,and Risk Prevention(JECAT′97). (印刷中). (1998)
K.Eguchi、T.Hayashi:“各种气氛下混合氧化物对NO_x的可逆吸附-解吸”Proc.Japan-EU Joint Workshop on the Frontiers of Catal.Sci.and Tech.for Energy,Environment,and Risk Prevention(JECAT) 97)(正在出版)。
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- 影响因子:0
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K.Eguchi, M.Watabe, S.Ogata, H.Arai: "Reversible Sorption of Nitrogen Oxides in Mn-Zr Oxide" Journal of Catalysis. Vol.158. 420-426 (1996)
K.Eguchi、M.Watabe、S.Ogata、H.Arai:“Mn-Zr 氧化物中氮氧化物的可逆吸附”催化杂志。
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- 影响因子:0
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K.Eguchi, T.Kondo, T.Hayashi, H.Arai: "Sorption of Nitrogen Oxides on MnO_y-ZrO_2 and Pt-ZrO_2-Al_2O_3" Applied Catalysis B : Environmental. (in press).
K.Eguchi、T.Kondo、T.Hayashi、H.Arai:“MnO_y-ZrO_2 和 Pt-ZrO_2-Al_2O_3 上氮氧化物的吸附”应用催化 B:环境。
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- 影响因子:0
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K.Eguchi, M.Watabe, M.Machida, H.Arai: "Selective Removal of NO by Absorption in Mixed Oxide Catalysts" Proceedings of the 1st World Conference on Environmental Catalysis. 195-198 (1995)
K.Eguchi、M.Watabe、M.Machida、H.Arai:“通过混合氧化物催化剂中的吸收选择性去除 NO”第一届世界环境催化会议论文集。
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- 影响因子:0
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EGUCHI Koichi其他文献
EGUCHI Koichi的其他文献
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{{ truncateString('EGUCHI Koichi', 18)}}的其他基金
Hydrogen production and separation processes employing proton conductor and water-gas shift reaction catalyst
采用质子导体和水煤气变换反应催化剂的氢气生产和分离方法
- 批准号:
19360366 - 财政年份:2007
- 资助金额:
$ 5.44万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Basic Sorption-Desorption Characteristics of NOx and SOx by Mixed Oxide Sorbents
混合氧化物吸附剂对 NOx 和 SOx 的基本吸附-解吸特性
- 批准号:
16360402 - 财政年份:2004
- 资助金额:
$ 5.44万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Fuel Reforming and CO Removal for Transportable Hydrogen Production Systems
可运输制氢系统的燃料重整和二氧化碳去除
- 批准号:
11450308 - 财政年份:1999
- 资助金额:
$ 5.44万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of new sorbent material for reversible removal of air pollutants using catalytic reactions
开发利用催化反应可逆去除空气污染物的新型吸附剂材料
- 批准号:
10555280 - 财政年份:1998
- 资助金额:
$ 5.44万 - 项目类别:
Grant-in-Aid for Scientific Research (B).
Investigation of efficient electro chemical reactor utilizing hydrogen
利用氢气的高效电化学反应器的研究
- 批准号:
09650908 - 财政年份:1997
- 资助金额:
$ 5.44万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Fabrication of Fuel Cells with Ceramic Gas Separation Membrane
陶瓷气体分离膜燃料电池的制造
- 批准号:
06650952 - 财政年份:1994
- 资助金额:
$ 5.44万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)