Increasingly strict environmental legislation is being applied to motor vehicle emissions. An important aspect of these regulations is the restriction of the amount of sulfur in vehicle transportation fuels. The process used to modify fuels and remove the sulfur is known as hydrodesulphurization (HDS). The HDS process requires novel catalyst materials that are often difficult to synthesize using traditional methods. Another synthesis method, mechanical alloying (MA), shows potential for producing catalysts but to date is not well documented for this application.
It is known that NEBULA (New Bulk Activity) catalysts based on Ni-Mo-W, are four times more active than typical catalysts and two times more than other advanced formulations. These types of catalysts opened the way to new bulk catalysts with improved catalytic activity in HDS.
In this work, researchers R. Huirache-Acuna, M. I. Flores Z., M. A. Albiter, I. Estrada-Guel, C. Ornelas, F. Paraguay-Delgado, J.L. Rico, L. Bejar-Gomez, G. Alonso-Nunez and R. Martinez-Sanchez, from Centro de Investigación en Materiales Avanzados (CIMAV) and Universidad Michoacana de San Nicolás de Hidalgo in Mexico prepared quaternary alloys of Ni-Mo-W-Al by mechanical alloying. In addition, a process of chemical extraction by alkaline leaching was applied to remove aluminum in order to increase the specific surface area (SSA) and to generate porous materials which were tested in the HDS of dibenzothiophene (DBT) to determine their catalytic activity and selectivity.
The catalyst materials produced were found to have a moderate catalytic activity, due to the synergized effect of small particle and crystal size, and presence of porosity.
Dr. Ian Birkby | EurekAlert!
Physics, photosynthesis and solar cells
01.12.2016 | University of California - Riverside
New process produces hydrogen at much lower temperature
01.12.2016 | Waseda University
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water
In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...
The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
02.12.2016 | Medical Engineering
02.12.2016 | Agricultural and Forestry Science
02.12.2016 | Physics and Astronomy