Technology and Applications of Microengineered Reactors

Gavriilidis, Asterios; Angeli, Panagiota; Cao, Enhong; Yeong, Kay Kin; Wan, Yu

doi:10.1205/026387602753393196

Cited by 217 publications

(118 citation statements)

References 100 publications

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“…Microreactors can help to meet those requirements [4,5]. More specifically, due to the very fast chemical kinetics and exothermicity of CO-PrOx, using microreactors allows avoiding mass and heat transport limitations which results in improved reactor performance and reaction selectivity [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations

Arzamendi

Uriz

Diéguez

et al. 2011

Chemical Engineering Journal

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Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations, Chemical Engineering Journal (2010), doi:10.1016/j.cej.2010.08.083 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. E-mail address: lgandia@unavarra.es (L.M. Gandía) AbstractA kinetic study of the preferential oxidation of CO in H 2 rich streams (CO-PrOx) over a cerium-copper oxide (CeCu) and a gold catalyst supported on cerium-iron oxide (Au/CeFe) is presented. The gold catalyst is very active but the CeCu oxide is more selective. A kinetic model describing the CO-PrOx system with CO 2 and H 2 O in the feed has been formulated considering the oxidation of CO and H 2 and the reverse water-gas shift reaction. The rate equations have been implemented in computational fluid dynamics codes to study the influence of the operating variables on the CO-PrOx in microchannels and microslits. TheCeCu catalyst is the only one capable of achieving final CO contents below 10-100 ppmv.Due to the opposite effect of temperature on activity and selectivity there is an optimalPage 2 of 31 A c c e p t e d M a n u s c r i p t 2 temperature at which the CO content is minimal over CeCu. This temperature varies between 170 and 200 ºC as the GHSV increases from 10 000 to 50 000 h -1. Simulations have evidenced the very good heat transfer performance of the microdevices showing that the COPrOx temperature can be controlled using air as cooling fluid although the inlet temperature and flow rate should be carefully controlled to avoid reaction extinction. Both microchannels and microslits behaved similarly. The fact that the microslits are much easier to fabricate may be an interesting advantage in favor of that geometry in this case.

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Section: Introductionmentioning

confidence: 99%

Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations

Arzamendi

Uriz

Diéguez

et al. 2011

Chemical Engineering Journal

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“…This property allows for a more precise manipulation of the processes to enable tighter control over NP characteristics. An advantage of microfluidic devices in particular is that they offer improved heat and mass transfer because of their smaller characteristic lengths [18]. There are excellent review papers that offer various examples of nanomaterials synthesis using a variety of microfluidic devices [19].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Silver Nanoparticles Using a Microfluidic Impinging Jet Reactor

Baber¹,

Mazzei²,

Thanh³

et al. 2016

J Flow Chem

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Synthesis of silver nanoparticles (NPs) in an impinging jet reactor (IJR) was investigated due to its unique properties of efficient mixing and lack of channel walls which avoid fouling. Silver NPs were formed at room temperature by reducing silver nitrate with sodium borohydride in the presence of sodium hydroxide. Two types of ligand were used to stabilize the NPs, trisodium citrate, and polyvinyl alcohol (PVA). Weber number, the ratio between inertial forces and surface tension forces, is used to characterize flow in impinging jets. Flow regimes were investigated for Weber numbers in the range of 13-176. A liquid sheet/chain regime was identified at lower Weber numbers (<90), and an unstable rim structure was identified at higher Weber numbers (>90). Mixing time was found to be in the range 1-7 ms, using the Villermaux-Dushman reaction system and interaction by exchange with the mean mixing (IEM) model. Fastest mixing occurred at Weber number ca. 90. Using trisodium citrate as a ligand, NP size decreased from 7.9 ± 5.8 nm to 3.4 ± 1.4 nm when flow rate was increased from 32 mL/min to 72 mL/min using 0.5 mm jets, and from 6.4 ± 3.4 nm to 5.1 ± 4.6 nm when flow rate was increased from 20 mL/min to 32 mL/min using 0.25 mm jets. Using PVA as a ligand, NP size decreased from 5.4 ± 1.6 nm to 4.2 ± 1.1 nm using 0.5 mm jets and stayed relatively constant between 4.3 ± 1 nm and 4.7 ± 1.3 nm using 0.25 mm jets. In general, the size of the NPs decreased when mixing was faster.

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“…Microreactors are very attractive devices for many different applications [6,7,8,9]. Different from the traditional scaleup, micro/milli channel reactors reach bulk chemicals productions via so called numbering up, placing multiple channels in parallel [10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Numbered-up gas–liquid micro/milli channels reactor with modular flow distributor

Al-Rawashdeh

Nijhuis

et al. 2012

Chemical Engineering Journal

103

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Gas-liquid processing in microreactors remains mostly restricted to the laboratory scale due to the complexity and expenditure needed for an adequate numbering-up with a uniform flow distribution. Here, the numbering-up is presented for multiphase (gas-liquid) flow in microreactor suitable for a production capacity of kg/h. Based on the barrier channels concept, the barrier-based micro/milli reactor (BMMR) is designed and fabricated to deliver flow non-uniformity of less than 10%. The BMMR consists of eight parallel channels all operated in the Taylor flow regime and with a liquid flow rate up to 150 mL/min. The quality of the flow distribution is reported by studying two aspects. The first aspect is the influence of different viscosities, surface tensions and flow rates. The second aspect is the influence of modularity by testing three different reaction channels type: (1) square channels fabricated in a stainless steel plate, (2) in a glass plate, and (3) circular channels (capillaries) made of stainless steel.Additionally, the BMMR is compared to that of a single channel regard the slug and bubble lengths and bubble generation frequency. The results pave the ground for bringing multiphase flow in microreactor one step closer for large scale production via numbering-up.

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Technology and Applications of Microengineered Reactors

Cited by 217 publications

References 100 publications

Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations

Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations

Synthesis of Silver Nanoparticles Using a Microfluidic Impinging Jet Reactor

Numbered-up gas–liquid micro/milli channels reactor with modular flow distributor

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