دانلود رایگان مقاله لاتین فاز آبی اکسیداسیون آمونیاک از سایت الزویر
عنوان فارسی مقاله:
فاز آبی (کاتالیزوری) اکسیداسیون آمونیاک مرطوب هوا: ملاحظات ترمودینامیکی
عنوان انگلیسی مقاله:
Aqueous phase (catalytic) wet air oxidation of ammonia: Thermodynamic considerations
سال انتشار : 2017
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مقدمه انگلیسی مقاله:
1. Introduction
Ammonia is being produced in large amounts for many different applications (e.g. fertilizers, nitric acid, cooling fluid, plastics, synthetic fibers and resins, explosives). The estimated word production of ammonia reached 146 million tons in 2015 [1]. It is mainly produced from molecular nitrogen and hydrogen via the Haber Bosch process. As a result, ammonia might be transferred to the atmospheric and aquatic environments, which represents a major risk both in terms of public health and environment (eutrophication, acidic rains). Ammonia release might also derive from the decomposition, oxidation or reduction of higher nitrogencontaining molecules. While a number of approaches has been developed to treat gaseous ammonia, via adsorption and/or oxidation, only a limited number of research works has been devoted to the treatment of ammonia in the liquid phase directly. Moreover, the most developed process in this later case is the stripping: the ammonia molecule is then transferred to the gas phase before being treated [2]. In addition, adsorption (clinoptilolite) [3,4], biological treatments (nitration-denitration [5], Anammox [6]) and advanced oxidationprocesses (ozonation[7,8], photocatalysis [9,10]) showed some major limitations either in terms of efficiency, cost and/or selectivity toward molecular nitrogen vs. nitrites and/or nitrates.To overcome such limitations, some attention has more recently been paid to the catalytic wet air oxidation process. Important improvements have been obtained with the implementation of supported noble metal catalysts [11–15], especially in terms of efficiency and selectivity. However, the catalytic wet air oxidation reaction being carried out in a three-phase reactor, a better understanding and description of the gas-liquid and liquid–liquid thermodynamic equilibria is necessary. Indeed, such knowledge is required in order to be able to accurately describe the ammonia catalytic wet air oxidation reaction mechanism and further extract the true kinetics for the different processes involved. Insights could also be gained on how to improve the reactivity of ammonia upon catalytic wet air oxidation. As the result, the objective of this preliminary study was to determine the partition of ammonia between the gas and liquid phases and, in the liquid phase, the speciation between ammonia and ammonium ion, as a function of temperature in the range 25–250 ◦C. The results of our calculations were then valuably compared with experimental data acquired in the catalytic wet air oxidation of ammonia upon blank experiments and/or in the presence of inert catalyst supports.
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کلمات کلیدی:
HTML - Scientific Research Publishing file.scirp.org/Html/6-8101856_26529.htm by C Uraz - 2013 - Cited by 1 - Related articles In this study, catalytic wet air oxidation of wastewater that contains organic ... However, the reaction conditions required to achieve oxidation in this aqueous phase .... and W. Lin, “Catalytic Wet Air Oxidation of Aqueous Solutions of Ammonia in ... [PDF]Liquid Phase Catalytic Oxidation of Aqueous Solutions That Contain ... file.scirp.org/pdf/ENG_2013011117054327.pdf by C Uraz - 2013 - Cited by 1 - Related articles Dec 20, 2012 - In this study, catalytic wet air oxidation of wastewater that contains organic matter (phenol) is investigated ... tions required to achieve oxidation in this aqueous phase ..... Aqueous Solutions of Ammonia in a Continuous-Flow. Total catalytic wet oxidation of phenol and its chlorinated derivates ... www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322009000300005 by AJ Luna - 2009 - Cited by 16 - Related articles Keywords: Wet Air Oxidation; Catalyzed Wet Oxidation; Effluent; Phenol; 2,4-D; .... the sub-critical wet oxidation of several refractory pollutants, such as ammonia, ... For this, a parametric study of phenol aqueous degradation with MnO2/CeO2 ... The total organic carbon contained in the liquid phase was determined using a ... [PDF]CATALYTIC WET OXIDATION OF AMMONIA SOLUTION WITH ... - SER ser.cienve.org.tw/download/18-2/jeeam18-2_85-91.pdf by CM Hung - Cited by 12 - Related articles Pingtung 909, Taiwan. Key Words: Catalytic wet oxidation (CWO), ammonia, trickle-bed reactor (TBR), platinum- ... fore, the removal of ammonia from air and waste streams is ... of between 0.5 and 20.0 MPa in the aqueous phase. However ... Mechanism and Kinetics of the Catalytic Oxidation of Aqueous ... pubs.acs.org/doi/abs/10.1021/es034332q by DK Lee - 2003 - Cited by 38 - Related articles Oct 22, 2003 - Aqueous phase catalytic oxidation of ammonia has been studied over ... simulation for the catalytic wet air oxidation of aqueous ammonia to ... Proceedings of the Estonian Academy of Sciences, Chemistry https://books.google.com/books?id=yODiuGynE-EC Vol. 53, No. 3 - Magazine A. Aqueous phase catalytic oxidation of phenol in a trickle bed reactor: effect ... D. Wet air oxidation of nitrogen-containing organic compounds and ammonia in ...
