The new technology for selective catalytic oxidation of ammonia to nitrogen

Sano, Kohei; Sugishima, Noboru; Ikeda, M.; Yoshino, Kenji; Okamura, Junji

doi:10.1016/s0167-2991(99)80104-9

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…Actually, a catalyst in line with such a concept has been shown to provide remarkably high catalytic performance for oxidation of ammonia to N 2 . 83…”

Section: Resultsmentioning

confidence: 99%

“…Especially, in a reaction condition with a high O 2 /NH 3 ratio, we propose that incorporation of an Ostwald reaction (reaction ) catalyst, e.g., Pt, Pd, Rh, etc., into a SCR reaction (reaction ) catalyst, i.e., V 2 O 5 –WO 3 –TiO 2 , might lead to a good candidate for SCO. Actually, a catalyst in line with such a concept has been shown to provide remarkably high catalytic performance for oxidation of ammonia to N 2 …”

Section: Resultsmentioning

confidence: 99%

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Mechanisms for Selective Catalytic Oxidation of Ammonia over Vanadium Oxides

Yuan

et al. 2011

J. Phys. Chem. C

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Selective catalytic oxidation (SCO) of ammonia to a nitrogen molecule is an important process involved in many applications such as removing NH(3) slip in selective catalytic reduction (SCR) of NO(x), reducing the NH(3) concentration from biomass-derived fuels, etc. Here we perform density functional theory calculations in conjunction with cluster models to investigate the SCO mechanisms on V(2)O(5) surfaces. Our calculations show that, at the initial stage, NH(3) can be activated by transferring an electron to the metal oxide surfaces, giving rise to an NH(3)(+) intermediate. We disclose that the subsequent pathways are strongly dependent on the availability of the gaseous species. When oxygen is limited or absent, N(2)H(4) can be produced from NH(3)(+) reacting with a second NH(3) or from two activated intermediates (e.g., NH(2) + NH(2) or ONH(2) + NH(2)), and oxidation of N(2)H(4) into N(2) by V=O is viable. On the other hand, when oxygen is abundant, NH(3)(+) will react with O(2) to make a NH(3)(+)center dot center dot center dot O(2) complex. Such a species will quiddy decompose into NO, which switches on the selective catalytic reduction (SCR) reaction, eventually leading to the formation of N(2). We propose that the combination of an efficient Ostwald reaction catalyst for NH(3) to NO transformation with a capable SCR reaction catalyst for NO reduction by NH(3) to N(2) can lead to a good candidate catalyst for SCO at the high O(2)/NH(3) ratio condition.Ministry of Science and Technology[2011CB808505, 2007CB815206]; National Natural Science Foundation of China[20973139, 20923004, 21033006, 21133004]; Program for Changjiang Scholars and Innovative Research Team in University[IRT1036]; Fundamental Research Funds for the Central Universities; Key Science and Technology Specific Projects of Fujian Province[2009HZ0002-1]; Natural Science Foundation of Fujian Province of China[2009J05035

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“…Actually, a catalyst in line with such a concept has been shown to provide remarkably high catalytic performance for oxidation of ammonia to N 2 . 83…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Mechanisms for Selective Catalytic Oxidation of Ammonia over Vanadium Oxides

Yuan

et al. 2011

J. Phys. Chem. C

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“…When oxidized with an ordinary Pt series oxidizing catalyst [5], [6], TMA generates NO , N O and CO in high concentrations, but when selective oxidation is conducted with a base metal series catalyst for nitrogenous compounds [7], [8], TMA decomposes into the harmless gases N , CO and H O.…”

Section: Outline Of New Processmentioning

confidence: 99%

An efficient treatment technique for TMAH wastewater by catalytic oxidation

Hirano

Okamura

Taira

et al. 2001

IEEE Trans. Semicond. Manufact.

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Developers used in photolithography contain toxic tetramethylammoniumhydroxide (TMAH) and this creates a problem of how to properly treat developer wastewater. We have developed a TMAH wastewater treatment technique that consists of a combination of two novel decomposition processes: pyrolyzing TMAH to TMA and decomposing TMA to N 2 , H 2 O, and CO 2 by means of a selective oxidation catalyst for nitrogenous compounds. We have tested a system using this technique in long-term treatment of the actual wastewater and have found it to be sufficiently practical. The running cost of a treatment system using our technique would be about one-ninth that of disposing of the wastewater as industrial waste but about 2.3 times that of biological treatment. Compared with biological treatment, however, our system is tolerant to many treatment conditions and operation management is much easier. Furthermore, it occupies only about one-sixth the area of a biological treatment system.

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“…[5][6][7][8] The oxidation of ammonia by metal oxide catalysts to yield dinitrogen is also one of the major products owing to the overoxidation of ammonia. [9][10][11] Nonselective oxidation of ammonia also produces a wide range of nitrogen-containing compounds such as N 2 , NO, N 2 O, HNO, HNO 2 , NO 3 À , NO 2 À and NH 2 OH. All the previous discussed methods suffer by either selectivity and/or drastic experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In the industries, ammonia is being overoxidized into nitric acid using different types of Pt catalysts under high pressure and high temperature (10 bar pressure and 900 °C), which is generally known as the Ostwald process . The oxidation of ammonia by metal oxide catalysts to yield dinitrogen is also one of the major products owing to the overoxidation of ammonia . Nonselective oxidation of ammonia also produces a wide range of nitrogen‐containing compounds such as N 2 , NO, N 2 O, HNO, HNO 2 , NO 3 − , NO 2 − and NH 2 OH.…”

Section: Introductionmentioning

confidence: 99%

Hydroxylamine synthesis by oxygen insertion into ReNH₂ bond via Baeyer–Villiger oxidation: a Theoretical study

Baskaran

Sivasankar

2015

J of Physical Organic Chem

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A novel scheme has been proposed by computational methods (B3LYP and CCSD(T)) to produce hydroxylamine under normal experimental conditions using [O 3 Re-(NH 2 )] and H 2 O 2 under basic conditions. This particular reaction may proceed similar to Baeyer-Villiger oxidation and μ-peroxo type pathways to insert oxygen into the Re-NH 2 bond to yield NH 2 OH; nevertheless, Baeyer-Villiger type oxidation is seems to be more viable. The calculated energy barriers further revealed that the introduction of different solvent medium does not affect significantly the energies of intermediates and transition state molecules. The calculated Gibbs free energies show that this reaction is perhaps viable experimentally to produce NH 2 OH from the our choice of reagents.

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The new technology for selective catalytic oxidation of ammonia to nitrogen

Cited by 5 publications

References 7 publications

Mechanisms for Selective Catalytic Oxidation of Ammonia over Vanadium Oxides

Mechanisms for Selective Catalytic Oxidation of Ammonia over Vanadium Oxides

An efficient treatment technique for TMAH wastewater by catalytic oxidation

Hydroxylamine synthesis by oxygen insertion into ReNH₂ bond via Baeyer–Villiger oxidation: a Theoretical study

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The new technology for selective catalytic oxidation of ammonia to nitrogen

Cited by 5 publications

References 7 publications

Mechanisms for Selective Catalytic Oxidation of Ammonia over Vanadium Oxides

Mechanisms for Selective Catalytic Oxidation of Ammonia over Vanadium Oxides

An efficient treatment technique for TMAH wastewater by catalytic oxidation

Hydroxylamine synthesis by oxygen insertion into ReNH2 bond via Baeyer–Villiger oxidation: a Theoretical study

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Product

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Hydroxylamine synthesis by oxygen insertion into ReNH₂ bond via Baeyer–Villiger oxidation: a Theoretical study