Catalytic oxidation of NO to NO2 for nitric acid production over a Pt/Al2O3 catalyst

Salman, Ata ul Rauf; Enger, Bjørn Christian; Auvray, X.; Lødeng, Rune; Menon, Mohan; Waller, David; Rønning, Magnus

doi:10.1016/j.apcata.2018.07.019

Cited by 47 publications

(34 citation statements)

References 33 publications

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“…This necessitates the quantification of the gas phase contribution to NO oxidation in the current study, which involves such a high concentration of NO (10%). The blank run performed without catalyst is given in our previous publication [5]. The gas phase conversion gradually decreases with increasing temperature in the studied temperature range (150-450 °C); with a conversion of 6.1% at 350 °C.…”

Section: No Oxidation Activitymentioning

confidence: 96%

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Catalytic Oxidation of NO over LaCo1−xBxO3 (B = Mn, Ni) Perovskites for Nitric Acid Production

et al. 2019

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Nitric acid (HNO3) is an important building block in the chemical industry. Industrial production takes place via the Ostwald process, where oxidation of NO to NO2 is one of the three chemical steps. The reaction is carried out as a homogeneous gas phase reaction. Introducing a catalyst for this reaction can lead to significant process intensification. A series of LaCo1−xMnxO3 (x = 0, 0.25, 0.5 and 1) and LaCo1−yNiyO3 (y = 0, 0.25, 0.50, 0.75 and 1) were synthesized by a sol-gel method and characterized using N2 adsorption, ex situ XRD, in situ XRD, SEM and TPR. All samples had low surface areas; between 8 and 12 m2/g. The formation of perovskites was confirmed by XRD. The crystallite size decreased linearly with the degree of substitution of Mn/Ni for partially doped samples. NO oxidation activity was tested using a feed (10% NO and 6% O2) that partly simulated nitric acid plant conditions. Amongst the undoped perovskites, LaCoO3 had the highest activity; with a conversion level of 24.9% at 350 °C; followed by LaNiO3 and LaMnO3. Substitution of LaCoO3 with 25% mol % Ni or Mn was found to be the optimum degree of substitution leading to an enhanced NO oxidation activity. The results showed that perovskites are promising catalysts for NO oxidation at industrial conditions.

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Section: No Oxidation Activitymentioning

confidence: 96%

“…Details of the reactor and experimental setup can be found in our previous publication [5]. Briefly, the activity of the catalysts was measured in a vertical stainless steel tubular reactor (internal diameter = 9.7 mm) operated at atmospheric pressure.…”

Section: Catalyst Activity Testingmentioning

confidence: 99%

Catalytic Oxidation of NO over LaCo1−xBxO3 (B = Mn, Ni) Perovskites for Nitric Acid Production

et al. 2019

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“…This way includes three critical steps: (a) ammonia is oxidized to NO with the help of Pt/Rh catalysts; (b) NO is further oxidized to NO 2 ; and (c) NO 2 is absorbed by H 2 O to produce nitric acid. 151 In these successive steps, ammonia oxidation (ie, steps a and b) is the most critical. Therefore, the ammonia oxidation in the Ostwald route should be paid more attention to.…”

Section: Ammonia Oxidation In the Ostwald Processmentioning

confidence: 99%

“…At present, the production of nitric acid mainly depended on the traditional Ostwald process. This way includes three critical steps: (a) ammonia is oxidized to NO with the help of Pt/Rh catalysts; (b) NO is further oxidized to NO 2 ; and (c) NO 2 is absorbed by H 2 O to produce nitric acid 151 . In these successive steps, ammonia oxidation (ie, steps a and b) is the most critical.…”

Section: Conversion Between Ammonia and Nitric Acid/nitratementioning

confidence: 99%

Rational design on photo(electro)catalysts for artificial nitrogen looping

Liu

Wang

et al. 2021

EcoMat

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Nitrogen, one of most important elements on the Earth, plays an essential role in shaping the modern society. The natural nitrogen looping, however, is insufficient to satisfy the high demand of the large-scale human activities. To achieve a more sustainable and efficient utilization of nitrogen, artificial nitrogen looping by photo(electro)catalytic processes has been considered as a feasible strategy. In this context, the rational design on the high-performance catalysts for nitrogen looping becomes increasingly important and urgent. On this basis, herein, we provide a timely review on the recent progress, achievements, and essential challenges for the artificial nitrogen looping process, mainly including photo(electro)catalytic transformations among dinitrogen, ammonia, gaseous nitrogen oxides, nitrate, and so on. Especially, the photo(electro)catalysts used in various reactions involved in nitrogen looping, including nitrogen reduction reaction, nitrogen oxidation reaction, ammonia oxidation reaction, ammonia decomposition reaction, etc., are systematically introduced. Finally, we hope that this review will help us deepen the understanding of nitrogen looping-related photo(electro)catalysts, and further pave a way toward the sustainable development on energy and environment. K E Y W O R D Senvironmental protection, nitrogen looping, photo(electro)catalysis, sustainable energy Mengying Li and Xiaoqing Liu contributed equally to this study.

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“…At the same time, investigators often only study the activity of catalysts in a low-temperature window gradually [75][76][77]. This method uses oxidizer to oxidize NO, which is not soluble in water, to NO 2 or N 2 O 3 in flue gas [78][79][80], which is then sprayed and washed by water, alkali solution, acid solution, or metal complex solution so that the NO x in the gas phase are transferred to the liquid phase to realize the denitrification treatment of the flue gas. O 3 , ClO 2 , NaClO 2 , NaClO, KMnO 4 , H 2 O 2 , Cl 2 , and HNO 3 can be used as oxidants [81].…”

Section: Removal Of No X By Oxidationmentioning

confidence: 99%

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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Nitrogen oxides (NO x ) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO x , it is urgent to control NO x . According to the different mechanisms of NO x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO x . At the same time, the current research status and existing problems of different NO x removal technologies were revealed and the future development prospects were forecasted.Catalysts 2019, 9, 771 2 of 39 adsorption, oxidation, reduction, and plasma methods. In view of these attentive findings, adsorption method uses recyclable solid adsorbent material to adsorb NO x from flue gas through microporous structure, remarkably, environmentally friendly, no secondary pollution, and energy-saving and -efficient features make it stand out [18][19][20]. The oxidation process is a method that oxidizes NO into NO 2 or N 2 O 3 with high solubility under the action of an oxidant that is then absorbed by water or alkali solution. The process is simple and cost-saving, and is widely used in the wet flue gas denitrification process with relatively low cost and high removal efficiency of NO x ; except that the oxidized NO and SO 2 can be removed simultaneously to produce high value-added products [21][22][23]. The reduction method has the characteristics of high efficiency, cleanliness, and mildness; NO x removal can be realized at low temperature at present [24][25][26]. The plasma method is used to modify the surface of the catalyst, the dispersion of active species can be improved by plasma treatment, and the stability and low temperature activity of catalyst can be improved [27,28].Seldom, if ever, does a comprehensive article to introduce the current situation and treatment methods of removing NO x . In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NO x removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NO x deeply, and mastering different technologies of removing NO x , as well as providing guidance for controlling the emission of NO x from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line.

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Catalytic oxidation of NO to NO2 for nitric acid production over a Pt/Al2O3 catalyst

Cited by 47 publications

References 33 publications

Catalytic Oxidation of NO over LaCo1−xBxO3 (B = Mn, Ni) Perovskites for Nitric Acid Production

Catalytic Oxidation of NO over LaCo1−xBxO3 (B = Mn, Ni) Perovskites for Nitric Acid Production

Rational design on photo(electro)catalysts for artificial nitrogen looping

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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