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Purification Technologies for NOx Removal from Flue Gas: A Review. SEPARATIONS 2022. [DOI: 10.3390/separations9100307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Nitrogen oxide (NOx) is a major gaseous pollutant in flue gases from power plants, industrial processes, and waste incineration that can have adverse impacts on the environment and human health. Many denitrification (de-NOx) technologies have been developed to reduce NOx emissions in the past several decades. This paper provides a review of the recent literature on NOx post-combustion purification methods with different reagents. From the perspective of changes in the valence of nitrogen (N), purification technologies against NOx in flue gas are classified into three approaches: oxidation, reduction, and adsorption/absorption. The removal processes, mechanisms, and influencing factors of each method are systematically reviewed. In addition, the main challenges and potential breakthroughs of each method are discussed in detail and possible directions for future research activities are proposed. This review provides a fundamental and systematic understanding of the mechanisms of denitrification from flue gas and can help researchers select high-performance and cost-effective methods.
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Wang R, Zhang X, Ren Z. Germanium-based polyoxometalates for the adsorption-decomposition of NO x. JOURNAL OF HAZARDOUS MATERIALS 2021; 402:123494. [PMID: 32712367 DOI: 10.1016/j.jhazmat.2020.123494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 07/03/2020] [Accepted: 07/11/2020] [Indexed: 06/11/2023]
Abstract
A series of germanium-based Keggin-type polyoxometalates (POMs), including H4GeW12O40 (HGeW), H5GeW11VO40 (HGeWV), H5GeMo11VO40 (HGeMoV) and H5GeW9Mo2VO40 HGeWMoV), were first synthesized and utilized as catalysts for removal of NOx. The fourier transform infrared spectroscopy (FT-IR) and temperature-programmed desorption-mass spectroscopy (TPD-MS) characterizations were carried out to investigate the adsorption-desorption behavior and decomposition mechanism of NOx. The adsorption experiments revealed that HGeW had the highest NOx adsorption capacity up to 16.2 mg NOx per gram catalyst. Two infrared characteristic bands appeared at 2210 and 1851 cm-1 after NOx adsorption, while the latter firstly discovered over NOx-absorbed POMs could be assigned to nitrosyl radical (NO·). The regeneration of HGeW could be realized via reducing the temperature in wet atmosphere to desorb NOx. TPD-MS was conducted to investigate the decomposition behavior of NOx over HGeW and tungstophosphoric acid (HPW). O2 was firstly detected among the decomposition products, besides N2 and N2O. According to conservation calculation based on N mass, NOx removal rate of 81.5 % and N2 selectivity of 68.3 % could be achieved for HGeW. While the NOx conversion rate and N2 selectivity for HPW reached 54.1 % and 53.4 %, respectively.
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Affiliation(s)
- Rui Wang
- School of Environmental Science and Engineering, Shandong University, No.27 Shanda South Road, Jinan, 250100, Shandong, People's Republic of China.
| | - Xveyang Zhang
- School of Environmental Science and Engineering, Shandong University, No.27 Shanda South Road, Jinan, 250100, Shandong, People's Republic of China
| | - Zhaoyong Ren
- School of Environmental Science and Engineering, Shandong University, No.27 Shanda South Road, Jinan, 250100, Shandong, People's Republic of China
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Ke Y, Huang W, Li S, Liao Y, Li J, Qu Z, Yan N. Surface acidity enhancement of CeO2 catalysts via modification with a heteropoly acid for the selective catalytic reduction of NO with ammonia. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01346f] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The surface acidity enhanced CeO2 catalysts exhibited a SCR reaction path that both mechanisms existed but E-R dominated.
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Affiliation(s)
- Yu Ke
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Wenjun Huang
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Sichao Li
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Yong Liao
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Jiaxing Li
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Zan Qu
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Naiqiang Yan
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
- Shanghai Institute of Pollution Control and Ecological Security
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Synthesis and photocatalytic activity assessing of the TiO2 nanocomposites modified by some lanthanide ions and tin-derivative sandwich-type polyoxometalates. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2018. [DOI: 10.1007/s13738-018-1375-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Dai X, Jiang W, Wang W, Weng X, Shang Y, Xue Y, Wu Z. Supercritical water syntheses of transition metal-doped CeO2 nano-catalysts for selective catalytic reduction of NO by CO: An in situ diffuse reflectance Fourier transform infrared spectroscopy study. CHINESE JOURNAL OF CATALYSIS 2018. [DOI: 10.1016/s1872-2067(17)63008-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Ren Z, Teng Y, Zhao L, Wang R. Keggin-tungstophosphoric acid decorated Fe 2 O 3 nanoring as a new catalyst for selective catalytic reduction of NO x with ammonia. Catal Today 2017. [DOI: 10.1016/j.cattod.2017.06.036] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Weng X, Dai X, Zeng Q, Liu Y, Wu Z. DRIFT studies on promotion mechanism of H 3 PW 12 O 40 in selective catalytic reduction of NO with NH 3. J Colloid Interface Sci 2016; 461:9-14. [DOI: 10.1016/j.jcis.2015.09.004] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 09/01/2015] [Accepted: 09/01/2015] [Indexed: 10/23/2022]
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Bahrami L, Khoshnavazi R, Rostami A. Tin-derivative sandwich-type polyoxometalates supported on Nd-doped TiO2 nanoparticles as efficient and reusable catalysts in the oxidation of sulfides and alcohols. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1095889] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Liela Bahrami
- Department of Chemistry, University of Kurdistan, Sanandaj, Iran
| | | | - Amin Rostami
- Department of Chemistry, University of Kurdistan, Sanandaj, Iran
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Baroi C, Dalai AK. Review on Biodiesel Production from Various Feedstocks Using 12-Tungstophosphoric Acid (TPA) as a Solid Acid Catalyst Precursor. Ind Eng Chem Res 2014. [DOI: 10.1021/ie5010866] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Chinmoy Baroi
- Catalysis
and Reaction Engineering
Laboratories, Department of Chemical and Biological Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskatchewan, Canada, S7N5A9
| | - Ajay K. Dalai
- Catalysis
and Reaction Engineering
Laboratories, Department of Chemical and Biological Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskatchewan, Canada, S7N5A9
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CHENG LIN, WANG RUI. CARBON NANOTUBES AND NANO- Ce–Zr OXIDES SUPPORTED H3PW12O40 FOR EFFECTIVE ADSORPTION–DECOMPOSITION OF NOx. INTERNATIONAL JOURNAL OF NANOSCIENCE 2012. [DOI: 10.1142/s0219581x12400303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Surface-modified carbon nanotubes (CNTs) and nano- Ce–Zr mixed oxides (CZO) were prepared and employed initially as supports of H3PW12O40 (HPW) for NO x adsorption–decomposition. Both CNTs and nano-CZO are favorable supports for HPW. After loading with HPW, the NO x adsorption efficiency increases, especially for HPW/CZO in which the highest adsorption efficiency can achieve 98% at the HPW loading of 70%, much higher than that of single HPW. NO x adsorption efficiency can be influenced considerably by catalyst preparing conditions, in particularly, ethyl alcohol is superior to water as solvent for HPW loading onto CNTs; the –OH containing CNTs shows better promotion effect on the adsorption of NO x than that containing –COOH when using absolute ethyl alcohol as solvent; mechanical grinding method is superior to incipient impregnation method in loading HPW onto the support of CZO. For both catalysts of HPW/CNTs and HPW/CZO, with the increase of HPW loading, the NO x adsorption efficiency tends to reach a peak value before dropping down. Heated from 150°C to 450°C at a rate of 50°C/min, the adsorbed NO was found to decompose into N2 , O2 and N2O , and yields of N2 being 21.8% and 27.3%, respectively for HPW/CNTs and HPW/CZO were obtained.
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Affiliation(s)
- LIN CHENG
- School of Environmental Science & Engineering, Shandong University, Jinan, Shandong Province, Jinan 250100, P. R. China
| | - RUI WANG
- School of Environmental Science & Engineering, Shandong University, Jinan, Shandong Province, Jinan 250100, P. R. China
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Nano Silica with High Surface Area from Rice Husk as a Support for 12-Tungstophosphoric Acid: An Efficient Nano Catalyst in Some Organic Reactions. CHINESE JOURNAL OF CATALYSIS 2012. [DOI: 10.1016/s1872-2067(11)60420-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hamad H, Hamieh T, Mahzoul H, Toufaily J. NOx Reduction Over MSU Molecular Sieve Catalysts Obtained by Direct Incorporation of Platinum and 12-Tungstophosphoric Acid H3PW12O40: deNOx Catalysis. ADV POWDER TECHNOL 2008. [DOI: 10.1163/156855208x294618] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Chai F, Wang X, Tan R, Cao F, Zhai F, Xu L, Shao C, Liu Y. Polyoxometalate-based Colloidal Crystal Thin Film. CHEM LETT 2007. [DOI: 10.1246/cl.2007.260] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gómez-García MA, Pitchon V, Kiennemann A. Pollution by nitrogen oxides: an approach to NO(x) abatement by using sorbing catalytic materials. ENVIRONMENT INTERNATIONAL 2005; 31:445-467. [PMID: 15734196 DOI: 10.1016/j.envint.2004.09.006] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2004] [Accepted: 09/08/2004] [Indexed: 05/24/2023]
Abstract
This article summarises the abatement of NO(x) pollution by using sorbing catalytic materials with special relevance to the challenge presented in fixed installations sources. A general vision of the origins of the different pollutants, with emphasis on nitrogen oxides formation, is presented as introduction. The impact of NO(x) pollution comprises additionally a quick view of its toxicity and environmental effects. Actual solutions are presented especially the case of the selective catalytic reduction (SCR) process with its advantages and difficulties. The new concepts for NO(x) abatement are also analysed. In such a way, updated information on solid sorbents for NO(x) removal is provided by including metal oxides, spinelles, perovskites, double-layered cuprates, zeolites, carbonaceous materials, heteropolyacids (HPAs), and supported heteropolyacids. The possibility of reducing those sorbed NO(x) is also underlined. Sorption mechanisms are analysed and clarified by emphasising convergence and disagreement points.
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Affiliation(s)
- M A Gómez-García
- LMSPC, Laboratoire de Matériaux, Surfaces et Procédés pour la Catalyse, UMR 7515 du CNRS-ECPM-ULP, 25 Rue Becquerel, 67087 Strasbourg Cedex 2, France
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Okumura K, Yoshimoto R, Suzuki K, Niwa M. Selective Catalytic Reduction of NO by Methane over Pd Loaded on Heteropolyacids/SiO2at Low Temperature. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2005. [DOI: 10.1246/bcsj.78.361] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gómez-García MA, Pitchon V, Kiennemann A. Removal of NOx from lean exhaust gas by storage/reduction on H3PW12O40 x 6H2O supported on Ce(x)Zr4-xO8. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2005; 39:638-644. [PMID: 15707066 DOI: 10.1021/es0498641] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We have demonstrated the interest of using Zr-Ce mixed oxides as supports for the system H3PW12O40 x 6H2O (HPW) and Pt for the storage (absorption into HPW and adsorption on Zr-Ce support)-reduction of NOx. Zr-Ce oxides adsorb NOx (mainly NO2) as nitrates, which are desorbed thermally as NO2 and NO (12 mg of NOx x g(-1)). On (HPW-Pt)/Zr-Ce system, NO and NO2 are stored equimolarly by substitution of water molecules of the HPW structure. The Zr/Ce support molar ratio has an important influence on the quantity of NOx stored with a maximum for the system Zr/Ce = 0.5. The presence of Pt has no influence on storage capacity but rather on its efficiency, and it is essential when reducing. Pt strongly accelerates both NOx desorption and reduction processes. Reduction of NOx occurs with H2, CO, or an H2/CO mixture. With H2, NO2 is reduced to NO. With CO, it seems reasonable that the mechanism of NO2 reduction concerns its reaction with CO to produce CO2 and NO. Addition of H2 to CO accelerates the reduction process. However, the difference between NOx stored and desorbed implies also the presence of another reduction step. This could be related to an NO interaction with an active site which produces its decomposition with nitrogen as product. The catalytic system proposed is highly selective since no N2O formation was detected.
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Affiliation(s)
- Miguel Angel Gómez-García
- Laboratoire de Matériaux, Surfaces et Procédés pour la Catalyse, Partner of European Laboratory of Catalysis and Surface Sciences, UMR 7515 du CNRS-ECPM-ULP, 67087 Strasbourg, Cedex 2, France
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Yang W, Billy J, Ben Taârit Y, Védrine J, Essayem N. H3PW12O40 supported on Cs modified mesoporous silica: catalytic activity in n-butane isomerisation and in situ FTIR study. Catal Today 2002. [DOI: 10.1016/s0920-5861(01)00508-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Catalytic activity of Pt and tungstophosphoric acid supported on MCM-41 for the reduction of NOx in the presence of water vapor. Catal Today 2000. [DOI: 10.1016/s0920-5861(00)00297-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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HADJIIVANOV KONSTANTINI. Identification of Neutral and Charged NxOySurface Species by IR Spectroscopy. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 2000. [DOI: 10.1081/cr-100100260] [Citation(s) in RCA: 1173] [Impact Index Per Article: 48.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Herring AM, McCormick RL, Boonrueng SR. A Comparison of the Interaction of Nitric Oxide with the Heteropolytungstic Acids H3PW12O40, H0.5Cs2.5PW12O40, HMgPW12O40, H8SiW11O38, H4SiW12O40, and H10CoW12O42. J Phys Chem B 2000. [DOI: 10.1021/jp9938213] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrew M. Herring
- Colorado Institute for Fuels and High Altitude Engine Research and Department of Chemical Engineering and Petroleum Refining, Colorado School of Mines, Golden, Colorado 80401-1887
| | - Robert L. McCormick
- Colorado Institute for Fuels and High Altitude Engine Research and Department of Chemical Engineering and Petroleum Refining, Colorado School of Mines, Golden, Colorado 80401-1887
| | - Sukrithirra R. Boonrueng
- Colorado Institute for Fuels and High Altitude Engine Research and Department of Chemical Engineering and Petroleum Refining, Colorado School of Mines, Golden, Colorado 80401-1887
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