Publications by Albert Renken | EPFL Graph Search

Photonic contacting of gas-liquid phases in a falling film microreactor for continuous-flow photochemical catalysis with visible light (vol 1, pg 636, 2016)

2019

Photonic contacting of gas-liquid phases in a falling film microreactor for continuous-flow photochemical catalysis with visible light

A microstructured falling film reactor was applied to the dye-sensitized photochemical conversion of 1,5-dihydroxynaphthalene to juglone. This continuous-flow microreactor enables the efficient contacting of a gas and a liquid phase in combination with ext ...

Royal Soc Chemistry2016

Fine structuration of low-temperature co-fired ceramic (LTCC) microreactors

Thomas Maeder, Lioubov Kiwi, Paul Muralt, Albert Renken, Bo Jiang, Julien Haber

The development of microreactors that operate under harsh conditions is always of great interest for many applications. Here we present a microfabrication process based on low-temperature co-fired ceramic (LTCC) technology for producing microreactors which ...

Royal Society of Chemistry2015

Activated carbon fibers for efficient VOC removal from diluted streams: the role of surface morphology

Lioubov Kiwi, Albert Renken, Guillaume Bastien Baur

The effect of the micropore structure of activated carbon fibers (ACFs) on the adsorption of toluene at low concentration (10-80 ppmv) was studied over two types of ACFs. Both adsorbents presented similar surface chemistry but different porous structure: o ...

Springer Verlag2015

Multi-injection microstructured reactor for intensification of fast exothermic reactions: proof of concept

Thomas Maeder, Lioubov Kiwi, Albert Renken, Bo Jiang, Julien Haber

Quasi-instantaneous exothermic reactions lead to the formation of unwanted hot spots even when carried out in conventional microstructured reactors (MSR) with tube diameter of 100 − 1000 μm. For this reason, alternative MSR designs are warranted to enable ...

Walter de Gruyter2013

Effects 0f Microfluidics on Preparative Chemistry Processes

Lioubov Kiwi, Albert Renken, Madhvanand Namadeo Kashid

This chapter deals with the effects of microfluidics on preparative chemistry processes. The main characteristic features of microstructured reactors (MSR) are their high surface area-to-volume ratio in the range from 10000 to 50000 m2/m3. Various paramete ...

wiley2013

Biphasic Model Describing Soybean Oil Epoxidation with H2O2 in Continuous Reactors

Albert Renken

Epoxidized soybean oil (ESBO) is produced in industry by reacting soybean oil, at 60-70 degrees C, with hydrogen peroxide in the presence of formic or acetic acid. A small amount of sulphuric or phosphoric acid is necessary to catalyze the oxidation of the ...

2012

Analytical method to predict two-phase flow pattern in horizontal micro-capillaries

Lioubov Kiwi, Albert Renken, Madhvanand Namadeo Kashid

An a priori prediction of multiphase flow pattern in micro-capillaries or microstructured reactors (MSR) is required for their rational design. The state-of-the-art numerical models require huge computational efforts. In the present work, an analytical mod ...

Elsevier2012

Catalytic non-thermal plasma reactor for abatement of toluene

Lioubov Kiwi, Albert Renken

A non-thermal plasma rector with a catalytic electrode made of sintered metal fibres (SMFs) was tested for the oxidative decomposition of a model VOC toluene. The input energy was varied in the range 160-295 J/I by varying the applied voltage between 12.5 ...

Elsevier2012

Kinetics of the Decomposition of Hydrogen Sulfide in a Dielectric Barrier Discharge Reactor

Lioubov Kiwi, Albert Renken

Kinetics of hydrogen sulfide (H2S) decomposition to hydrogen and sulfur was investigated in a nonthermal plasma dielectric barrier discharge (NTP-DBD) reactor operated under ambient conditions. The reactions were carried out with a fixed flow rate and vary ...

Wiley-Blackwell2012

Mixing efficiency and energy consumption for five generic microchannel designs

Lioubov Kiwi, Albert Renken, Madhvanand Namadeo Kashid

Mixing is an essential part of chemical processes. In the present work, homogeneous mixing at relatively high throughput for a single microchannel (of 1-18 mL/min) was investigated in microchannels with different dimensions, cross sections and mixing eleme ...

2011

A novel compact reactor for three-phase hydrogenations

Lioubov Kiwi, Albert Renken, Martin Grasemann, Madhvanand Namadeo Kashid

A novel reactor based on a bubble column staged by structured catalytic layers with integrated cross flow micro-heat-exchangers (HEX) was designed and tested in the solvent free hydrogenation of 2-methyl-3-butyn-2-ol (MBY) aiming on process intensification ...

Elsevier2010

Kinetics of the solvent-free hydrogenation of 2-methyl-3-butyn-2-ol over a structured Pd-based catalyst

Lioubov Kiwi, Albert Renken, Martin Grasemann, Rocio Micaela Crespo Quesada

The solvent-free selective hydrogenation of 2-methyl-3-butyn-2-ol (MBY) to 2-methyl-3-buten-2-ol (MBE) was studied over a Pd/ZnO structured catalyst and compared to its behavior in water-assisted conditions. The catalytic behavior was correlated with the s ...

2009

N2O Decomposition over Fe-ZSM-5 Studied by Transient Techniques

Lioubov Kiwi, Albert Renken, Bryan Bromley, Petra Prechtl

N2O decomposition to gaseous N-2 and O-2 catalyzed by a commercial Fe-ZSM-5 has been studied by different transient techniques: (i) via the transient response methods at ambient pressure, (ii) via the temporal analysis of products (TAP) reactor under vacuu ...

2009

“Sandwich Reactor” for Heterogeneous Catalytic Processes: N2O Decomposition as a Case Study

Lioubov Kiwi, Albert Renken, Bryan Bromley

A novel “sandwich” microreactor designed as a thin (∼ 300

\mu

m) porous plate of sintered metal fibers (SMF), sandwiched between metallic plates is reported. The SMF surface was coated by Fe-ZSM-5 thin film (< 2

\mu

m) rendering a catalyst highly active ...

2008

Three-Phase Catalytic Hydrogenation of a Functionalized Alkyne: Mass Transfer and Kinetic Studies with in Situ Hydrogen Monitoring

Lioubov Kiwi, Albert Renken, Martin Grasemann

Systematic studies of mass transfer interactions with intrinsic reaction kinetics were performed for the threephase selective hydrogenation of 2-methyl-3-butyn-2-ol (MBY) to 2-methyl-3-buten-2-ol (MBE) over a modified Pd/CaC

{O}_{3}

catalyst under solvent ...

2008

Growth of carbon nanotubes and microfibers over stainless steel mesh by cracking of methane

Lioubov Kiwi, Albert Renken

The

{La}_{2}{NiO}_{4}

film was synthesized on the 304 stainless steel (SS) mesh. The hydrogen reduction of La2NiO4 generated homogeneous nanocatalyst particles (probably

{Ni}/{La}_2{O}_{3}

) over which methane was cracked, producing carbon notubes/micro ...

2008

Novel design of a microstructured reactor allowing fast temperature oscillations

Lioubov Kiwi, Albert Renken, Martin Luther

Two types of stainless steel microstructured reactors for catalytic gas-phase reactions have been developed and characterized with respect to their thermal behaviour under non-stationary temperature conditions. One of the reactors used (FTC-I) allowed peri ...

2008

Structured catalyst of Pd/ZnO on sintered metal fibers for 2-methyl-3-butyn-2-ol selective hydrogenation (vol 251, pg 213, 2007)

Lioubov Kiwi, Albert Renken, Nicolas Xanthopoulos, Martin Grasemann

Elsevier2008

Liquid–liquid two-phaseflow patterns andmasstransfer characteristics inrectangular glassmicroreactors

Lioubov Kiwi, Albert Renken, Anne-Laure Dessimoz

The flow of two immiscible fluids was investigated in rectangular glass microchannels with equivalent diameters of 269 and 400

\mu m

. Deionised water, dyed toluene and hexane were selected as probe fluids. Flow patterns were obtained for Y- and T-junction ...

Elsevier2008