Highlights with ‘oil & gas’

H2 production by PAH gasification

The gasification of polycyclic aromatic hydrocarbons (PAHs) in supercritical water has been studied with a DFT and ReaxFF. Supercritical water decreases the barrier for the rate-determining ring opening of PAHs by over 550 kJ/mol, thereby accelerating...

Zeolite-catalyzed hydrolysis: DFT/DFTB calculations

The catalytic hydrolysis of propylene oxide in ZSM-5 was investigated using multi-layered ADF/DFTB calculations with QUILD. Using dispersion-corrected DFT (BP86-D3) at the high level and third-order DFTB (DFTB3) at the low level,  both monopropylene glycol and dipropylene...

Insights into the components of MAO mixtures

Methylaluminoxane (MAO) is one of the most commonly utilized co-catalysts in the single-site production of polyolefins catalyzed by metallocenes. However, its exact structure has eluded experimental characterization because of the dynamic equilibrium between various species...

Gas Solubility in Ionic Liquids

In a recent Chemical Reviews paper researchers from the Beijing University of Chemical Technology have reviewed various models for predicting solubility of gases in ionic liquids (ILs), with a focus on CO2. The predictions of...

COSMO-SAC-2013: Improved thermodynamic properties predictions

Xiong, Sandler, and Burnett (Chemical Engineering, University of Delaware) recently reported a new COSMO-SAC-2013 model, with parameters also available for the COSMO-RS implementation in ADF. With a single set of universal parameters, COSMO-SAC-2013 provides higher accuracy than previous...

Relativistic DFT locates 13C NMR signal of dirhodium carbene

DFT predictions by Jochen Autschbach helped to characterize a long sought-after dirhodium donor-acceptor carbene, an important reaction intermediate in various organic transformations. The NMR modules in ADF, by Jochen and others, was used to calculate the...

Catalyst selection: survival of the weakest

ADF calculations support a new mass spectrometric method to select the best catalysts from a combinatorial library in a combined experimental-theoretical study. The turnover frequency determining step for the Pd-catalyzed allylic alkylation is the nucleophilic...

Char combustion modeled with ReaxFF

Modeling the detailed chemical reaction dynamics of a complex system at the atomistic level is computationally too demanding for quantum-chemical methods and impossible with traditional force fields based on equilibrium properties. In the ReaxFF force...