Air purification in a reverse‐flow reactor: Model simulations vs. experiments

Beld, L. van de; Westerterp, K.R.

doi:10.1002/aic.690420425

Cited by 39 publications

(20 citation statements)

References 17 publications

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“…[7][8][9] Catalytic combustion of hydrocarbons in RFR using particulate catalysts (spheres, extrudates, Raschig rings, etc) has been extensively studied by different authors. 5,10,11 However, if the RFR technology is extended to real emissions, the particulated beds must be replaced by monoliths, which are the devices able to manage high flow rates with affordable pressure drops. 9,12 This work is motivated by the few experimental studies about monolithic RFR appearing in the literature: Nieken and Eigenberger 13,14 studied the combustion of propane and propylene using Pd and Pt monoliths, Ramdani et al 15 considered the combustion of xylene at low switching times and tested a control system, Litto et al 16 studied the combustion of methane, but using rings as catalyst and monoliths only as inert beds, and more recently Gosiewski et al 17 compared the performance of inert pellets and monoliths for the homogeneous (noncatalytic) combustion of methane.…”

Section: Introductionmentioning

confidence: 99%

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Marín¹,

Ordóñez²,

Dı́ez³

2010

AIChE Journal

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The performance of a bench-scale monolithic reverse-flow reactor (RFR) for methane combustion has been experimentally studied in this work. The influence of the different operating parameters, such as total gas flow rate (2.5 Â 10(STP)), methane inlet concentration (1000-5500 ppm), and switching time (300-900 s) on the reactor performance (outlet conversion and stability), has been experimentally determined. The validation of a heterogeneous one-dimensional dynamic model for monolithic beds with the obtained experimental data allows the use of this model to simulate the behavior of industrial-scale reactors. In the second part of the work, a systematic comparison of particulate and monolithic RFRs is carried out through design curves. Reactor length for 99% outlet conversion and the corresponding pressure drop is determined for varying operating conditions (surface velocity and inlet methane concentration).

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Section: Introductionmentioning

confidence: 99%

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Marín¹,

Ordóñez²,

Dı́ez³

2010

AIChE Journal

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“…Besides removing CO 2 from H 2 , we propose that our polymer membranes are likewise suitable for the removal of CO 2 from N 2 /O 2 mixtures and, therefore, the purification of air in re-circulation systems. [20] In such applications, the CO 2 /N 2 selectivity provides a sensible measure of efficacy. Values of CO 2 /N 2 selectivity derived from the data in Figure 1b are 12 (PE), 54 (PEGda575), and 70 (PEGda700).…”

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confidence: 99%

Highly CO₂‐Permeable and Selective Polymer Nanocomposite Membranes

2003

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designed morphology. By using the same method, we have also successfully synthesized PbS hollow spheres of submicrometer scale. Compared with previous methods of preparing hollow spheres, the route presented here is simpler and more effective. It may stimulate technological interest and prospect many applications in materials related fields. ExperimentalIn a two-step procedure for the preparation of NiS hollow spheres, 4 mL MMA monomer was first added to 6 mL absolute ethanol, which was irradiated in the field of 2.59 10 15 Bq of a 60Co c-ray source with a dose of 0.8 kGy. After irradiation, transparent PMMA gel was obtained. This PMMA gel was then divided into pieces, which were put into a mixture consisting of 50 mL ethanol containing 0.664 g NiSO 4´6 H 2 O, 1.66 g CS 2 , and 20 mL distilled water. While the gel was reaching its swelling equilibrium, 20 mL of isopropanol was added, which should scavenge the formed oxidative radicals ( . OH). Then the gel was also irradiated with the same c-ray source as above with a dose of 48.8 kGy. The samples were heated for 3 h at 125 C in air, forming films, which were washed with distilled water and ethanol solution several times till the final products had high purity.EDX spectra were obtained using a JEOL-2010 transmission electron microscope. AFM was carried on a Seiko SPI 3800N high-vacuum scanning probe microscope system. FESEM was performed on a JEOL JSM-6700 field-emission scanning electron microanalyzer. TEM images were obtained on a Hitachi H-800 transmission electron microscope with an accelerating voltage of 200 kV. HRTEM was obtained on a JEOL-2010 transmission electron microscope. The UV-vis absorption was recorded on a UV-vis spectrophotometer Specord 200 (Analytik Jena AG) absorption diode array spectrometer using 1 cm quartz cuvettes. Fluorescence was detected by a Hitachi 850 fluorescence spectrometer with a Xe lamp at 25 C (k ex = 277 nm).

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“…Aubé and Sapoundjiev, 8 Chaouki et al, 9 Fissore et al, 10 and Hevia et al, 11 -13 among others, also performed detailed experimental studies of methane combustion in RFRs Gosiewski et al, 14 Kushwaha et al, concentration, solid properties and switching time) on reactor performance. The catalytic combustion of other short-chain hydrocarbons, such as ethane, ethylene, propane or propene, have been studied experimentally in RFR by d Beld et al, 18,19 Ben-Tullilah et al, 20 Cunill et al, 21 Nieken et al, 22 Sheintuch and Nekhamkina, 2 and Züfle and Turek. 23 However, published works dealing with the application of RFR to the combustion of long-chain hydrocarbons are much scarcer: Matros et al 24 studied the combustion of butane and propane, and Ramdani et al 25 considered the combustion of xylene.…”

Section: Introductionmentioning

confidence: 99%

Systematic study of the performance of a reverse flow reactor for the treatment of lean hydrocarbon emissions

Marín¹,

Ordóñez²,

Dı́ez³

2009

J of Chemical Tech & Biotech

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BACKGROUND: Reverse flow reactors are widely used for the treatment of gaseous emissions containing different hydrocarbons. However, most of the reported studies are focused on the combustion of a given hydrocarbon over a given catalyst. Consequently, any conclusions are difficult to extrapolate to other systems due to the wide range of variation of the chemical properties in these systems (reactivity, concentrations, combustion enthalpy, etc.).

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Air purification in a reverse‐flow reactor: Model simulations vs. experiments

Cited by 39 publications

References 17 publications

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Highly CO₂‐Permeable and Selective Polymer Nanocomposite Membranes

Systematic study of the performance of a reverse flow reactor for the treatment of lean hydrocarbon emissions

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Air purification in a reverse‐flow reactor: Model simulations vs. experiments

Cited by 39 publications

References 17 publications

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Highly CO2‐Permeable and Selective Polymer Nanocomposite Membranes

Systematic study of the performance of a reverse flow reactor for the treatment of lean hydrocarbon emissions

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Highly CO₂‐Permeable and Selective Polymer Nanocomposite Membranes