Decomposition of ammonia over quartz sand at 840-960.degree.C

Cooper, David; Ljungstroem, E.

doi:10.1021/ef00011a019

Cited by 28 publications

(20 citation statements)

References 3 publications

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“…To investigate the impact of surface effects, these experiments were conducted in both an alumina and a quartz tube. Ammonia is known to decompose on quartz surfaces [70][71][72], and while surface effects are unimportant in SNCR for experiments carried out at low surface-to-volume ratios [36,73], it has been observed that induction times for oxidation of NH 3 in quartz reactors were influenced by heterogeneous effects [28].…”

Section: Resultsmentioning

confidence: 99%

Ammonia oxidation at high pressure and intermediate temperatures

Song

Hashemi

Christensen

et al. 2016

Fuel

290

132

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a b s t r a c tAmmonia oxidation experiments were conducted at high pressure (30 bar and 100 bar) under oxidizing and stoichiometric conditions, respectively, and temperatures ranging from 450 to 925 K. The oxidation of ammonia was slow under stoichiometric conditions in the temperature range investigated. Under oxidizing conditions the onset temperature for reaction was 850-875 K at 30 bar, while at 100 bar it was about 800 K, with complete consumption of NH 3 at 875 K. The products of reaction were N 2 and N 2 O, while NO and NO 2 concentrations were below the detection limit even under oxidizing conditions. The data were interpreted in terms of a detailed chemical kinetic model.

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Section: Resultsmentioning

confidence: 99%

Ammonia oxidation at high pressure and intermediate temperatures

Song

Hashemi

Christensen

et al. 2016

Fuel

290

132

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“…Thus, the surface of nitridated shells consists of Ti–O, Ti–N, and Ti–N–O chemical bonding states. These different bonding states of Ti in the nitridated shells can be explained by the thermal decomposition of NH 3 to H 2 and N 2 at high temperature (>550 °C) . The decomposed hydrogen gas can play a role in partially reducing TiO 2 , which facilitates the penetration of nitrogen and the formation of oxygen vacancies in the TiO 2 crystal structure.…”

Section: Resultsmentioning

confidence: 99%

“…Herein, we report the successful synthesis of hollow nitridated titania shells on a sub‐micrometer scale through simple nitridation of sol‐gel derived hollow TiO 2 spheres under ammonia environment at elevated temperatures. The nitridation process is facilitated by the thermal decomposition of NH 3 to H 2 and N 2 at high temperatures . These nitridated hollow shells are assembled into a monolayer film on a water surface, enabling subsequent transfer onto a substrate, which can be done repeatedly and on a large scale.…”

Section: Introductionmentioning

confidence: 99%

Nitridation and Layered Assembly of Hollow TiO₂ Shells for Electrochemical Energy Storage

Moon

Joo

Dahl

et al. 2013

Adv Funct Materials

109

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The nitridation of hollow TiO2 nanoshells and their layered assembly into electrodes for electrochemical energy storage are reported. The nitridated hollow shells are prepared by annealing TiO2 shells, produced initially using a sol–gel process, under an NH3 environment at different temperatures ranging from 700 to 900 °C, then assembled to form a robust monolayer film on a water surface through a quick and simple assembly process without any surface modification to the samples. This approach facilitates supercapacitor cell design by simplifying the electrochemical electrode structure by removing the need to use any organic binder or carbon‐based conducting materials. The areal capacitance of the as‐prepared electrode is observed to be ≈180 times greater than that of a bare TiO2 electrode, mainly due to the enhanced electrical conductivity of the TiN phase produced through the nitridation process. Furthermore, the electrochemical capacitance can be enhanced linearly by constructing an electrode with multilayered shell films through a repeated transfer process (0.8 to 7.1 mF cm–2, from one monolayer to 9 layers). Additionally, the high electrical conductivity of the shell film makes it an excellent scaffold for supporting other psuedocapacitive materials (e.g., MnO2), producing composite electrodes with a specific capacitance of 743.9 F g–1 at a scan rate of 10 mV s–1 (based on the mass of MnO2) and a good cyclic stability up to 1000 cycles.

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“…The decomposition of NH 3 has been studied under different conditions: thermal [1,2], catalytic [3,4], photo-chemical [5], and in plasma [6]. The kinetics and the reaction mechanism -even in the simplest case of thermal decomposition -have not yet been fully elucidated with several matters still in dispute.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of ammonia. N2H4-an intermediate reaction product

et al. 2006

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The paper reports the thermal decomposition of ammonia under dynamic conditions at 800• C in a quartz reactor. Its purpose is to confirm the homogeneous-heterogeneous degenerated branched chain mechanism established in previous studies, which assume the formation of N 2 H 4 as a molecular intermediate; this paper identifies hydrazine as a product of thermal decomposition using FT-IR and UV-VIS spectroscopies.

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Decomposition of ammonia over quartz sand at 840-960.degree.C

Cited by 28 publications

References 3 publications

Ammonia oxidation at high pressure and intermediate temperatures

Ammonia oxidation at high pressure and intermediate temperatures

Nitridation and Layered Assembly of Hollow TiO₂ Shells for Electrochemical Energy Storage

Thermal decomposition of ammonia. N2H4-an intermediate reaction product

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Decomposition of ammonia over quartz sand at 840-960.degree.C

Cited by 28 publications

References 3 publications

Ammonia oxidation at high pressure and intermediate temperatures

Ammonia oxidation at high pressure and intermediate temperatures

Nitridation and Layered Assembly of Hollow TiO2 Shells for Electrochemical Energy Storage

Thermal decomposition of ammonia. N2H4-an intermediate reaction product

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Nitridation and Layered Assembly of Hollow TiO₂ Shells for Electrochemical Energy Storage