Personal profile

Personal profile

Leon Lefferts (1960) was trained as a chemical engineer at the University of Twente (1983) and received his PhD in 1987 also at the University of Twente. He continued to specialize on heterogeneous catalysis and joined the DSM Research laboratories (1987-1999), working on catalyst characterization, hydrogenation, slurry phase catalysis, carbon supported metals and kinetics. He acted as research scientist, project leader as well as senior scientist.

He was appointed full professor “Catalytic Processes and Materials” (CPM) at the University of Twente in 1999. He has been visiting professor at Tokyo Institute of Technology, 2005-2007. He was appointed as Finnish Distinguished Professor in 2011-2015, and is continuing as a visiting professor at Aalto University in Helsinki till 2019.

Research interests

The first theme is heterogeneous catalysts in liquid phase, motivated on both technological challenges, striving for minimization of concentration gradient in porous catalyst particles, as well as fundamental challenges, developing new experimental techniques for studying the catalyst surface in contact with liquid reactant mixtures and solutions. Most important results include the development of a new class of micro-structured catalyst supports (hairy foams) and more recently structured membrane contactor reactors based on CNFs, as well as pushing the borders of application of in-situ IR spectroscopy in aqueous phase with dedicated cells that enable Attenuated-Total-Reflection IR spectroscopy, recently even at elevated temperatures and pressures e.g. for aqueous phase reforming. The group is in the forefront of this technology and our work was highlighted in Chem. Soc. Rev.. Most of the work done so far was using hydrogenation of nitrate, nitrite and bromate as model reactions, that are also societal relevant in the realm of purification of drinking-water.

 

Second theme is activation of stable molecules, including selective oxidation. This work is exploring breakthrough technologies for activation of alkanes, e.g. via using soft oxidants, non-redox catalysts at high temperatures, electrical fields or plasma-catalysis. A cluster of three recent projects in close cooperation with DIFFER (FOM institute on energy, Prof. van de Sanden c.s.)) is aiming at combining plasma technology with heterogeneous catalysis, implying the need to build mutual understanding and cooperation with the plasma-physicists community. Joint workshops have been organized on this emerging theme, interacting with University of Antwerp (Prof. Bogaerts, dr. Meynen, TUe (Prof. Hessel) and in future also DIFFER will be involved. Furthermore, the use of water as a soft oxidant is of special interest and the role of oxide materials for activation of water is subject of investigations. The work on zirconia and ceria, both at Twente and at Aalto, is highly appreciated by the field, is frequently cited, and Leon delivered invited lectures on the subject. This work relevant is for steam reforming of hydrocarbons and oxygenates, as well as for water-gas-shift.

 

Finaly, catalytic upgrading of biomass, e.g. upgrading of flash-pyrolysis oil, both during flash-pyrolysis as well as down-stream has been an active research theme for quite some time. This direction was highly inspired on the early activities at University of Twente of prof. Wim van Swaaij, who explored the technology of flash pyrolysis at an early stage. The group has been a trendsetter in this field and early work on e.g. reforming of acetic-acid is an over-200 times cited research (non-review) paper. Also aqueous phase reforming of oxygenates and carbohydrates is studied in a number of projects. The most important result, next to a significant number of papers, is the development of a basic heterogeneous catalyst improving the quality of flash-pyrolysis oil, based on which KiOR decided to develop this technology to demonstration level.

External positions

Visiting Professor at Aalto University

2011 → …

Keywords

  • QD Chemistry
  • TP Chemical technology
  • Heteroeneous Catalysis
  • Liquid Phase
  • Mass Transfer
  • Plasma Catalysis
  • Activation of stable molecules

Fingerprint Fingerprint is based on mining the text of the person's scientific documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

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Research Output 1986 2018

Catalysis: An Integrated Textbook for Students

Lefferts, L. (ed.) & Hanefeld, U. (ed.) 2018 1st ed. Weinheim: Wiley-VCH Verlag GmbH & Co.370 p.

Research output: ScientificBook editing

Cortodoxone
nitrite
Membranes
Hydrogen
hydrogen
membrane

Immobilized carbon nanofibers: a novel structured catalyst support

Roemers-van Beek, J. M. 16 Feb 2018 Enschede. 108 p.

Research output: ScientificPhD Thesis - Research UT, graduation UT

Carbon nanofibers
Alginates
Catalyst supports
DNA Mutational Analysis
Erythrasma
1 Citations

Adsorption and Activation of Water on Cuboctahedral Rhodium and Platinum Nanoparticles

Bazhenov, A. S., Lefferts, L. & Honkala, K. 2 Mar 2017 In : Journal of physical chemistry C. 121, 8, p. 4324-4331 8 p.

Research output: Scientific - peer-reviewArticle

Nanoparticles
Water
Chemical activation
Metals
Adsorption
1 Citations

ATR-IR spectroscopic cell for in situ studies at solid-liquid interface at elevated temperatures and pressures

Koichumanova, K., Visan, A., Geerdink, B., Lammertink, R. G. H., Mojet, B., Seshan, K. & Lefferts, L. 2017 In : Catalysis today. 283, 1, p. 185-194 10 p.

Research output: Scientific - peer-reviewArticle

Liquids
Temperature
Hydrodynamics
Catalysts
Pressure control

Activities 2008 2017

  • 16 Oral presentation
  • 2 Invited talk

Tuning catalysts to mass transfer

Lefferts, L. (Speaker)
15 Dec 2017

Activity: Invited talk

Elucidation of relationships between structure and catalytic properties in water hydrotreatment reactions by use of catalysts based on controlled size nanoparticles

J.A. Baeza (Speaker), L. Calvo (Speaker), Y. Zhao (Speaker), Lefferts, L. (Speaker), J.J. Rodriquez (Speaker), M.A. Gilarranz Redondo (Speaker)
2 Apr 2014

Activity: Oral presentation

Catalytic conversion of wood waste to fuels

M. Zabeti (Speaker), Lefferts, L. (Speaker), Seshan, K. (Speaker)
11 Mar 2013

Activity: Oral presentation

High Temperature and High Pressure Infrared Spectroscopy for heterogeneous liquid phase catalysis

Kamila Koichumanova (Speaker), Geerdink, B. (Speaker), Lefferts, L. (Speaker), Seshan, K. (Speaker), Barbara Mojet (Speaker)
2 Jun 2013

Activity: Oral presentation