Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Nano-sediment highways in catalyst

21.03.2003


Dutch chemists have visualised how the porous structure of a zeolite catalyst depends on the production method. Zeolite made with carbon fibres as a template, has particles with straight canals that act as highways for the oil components which must be converted into benzene components.



Zeolite is normally given a steam treatment to improve its catalytic properties. As a result of this the mineral acquires a more sponge-like structure. The canals formed ensure that the zeolite crystal becomes more easily accessible. At least, that is generally thought to be the case.

Ries Janssen from Utrecht University demonstrated that about a quarter of all canals were closed cavities which did not contribute to an improved accessibility. This was shown using electron entomography, a special form of electron microscopy that provides a three-dimensional image.


Subsequently the researcher tried to make better canals in the zeolite. He used carbon powder as a template for this. The zeolite particles crystalise out on the carbon. After the carbon has been burnt away porous zeolite crystals remain. The carbon structure therefore determines the size and shape of the canals in the zeolite.

Under the electron microscope it could be seen that the new method provided a good open structure with twisting canals.

An even better structure was achieved when carbon fibres were used a template. That produced a zeolite with straight canals which acted as highways transporting reacting substances to and from the zeolite.

Zeolite is a natural mineral. It consists mainly of silicon oxide in which the silicon atoms are sometimes replaced by aluminium atoms, which have one electron less per atom. When this charge difference is compensated for with a proton, the zeolite is active for acid catalysis. Zeolites have molecule-sized pores. These micropores are part of the crystal structure. That makes zeolites suitable for use as selective catalysts. Only molecules which fit through the pores can react. The petrochemical industry uses different types of zeolite for various conversions, including the preparation of benzene from crude oil.

Nalinie Moerlie | alfa
Further information:
http://www.nwo.nl/news

More articles from Life Sciences:

nachricht Bare bones: Making bones transparent
27.04.2017 | California Institute of Technology

nachricht Link Discovered between Immune System, Brain Structure and Memory
26.04.2017 | Universität Basel

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Bare bones: Making bones transparent

27.04.2017 | Life Sciences

Study offers new theoretical approach to describing non-equilibrium phase transitions

27.04.2017 | Physics and Astronomy

From volcano's slope, NASA instrument looks sky high and to the future

27.04.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>