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This paper describes a radiotracer investigation carried out to measure residence time distribution (RTD) of petroleum residues in pilot-scale soakers. The main objectives of the investigation were to evaluate the feasibility of using bromine-82 as dibromobiphenyl (DBBP) for tracing the petroleum residues (organic phase) as a radiotracer at elevated temperature and pressure, and to investigate the...
There is an urgent need to discover new anti-microbial agents that can overcome the increasing antibiotic resistance posed by multidrug resistant, β-lactamase producing bacteria. β-Lactam antibiotics are structurally related through the presence of a core β-lactam ring. Resistant pathogens are able to produce β-lactamase enzymes that hydrolyze the β-lactam ring and inactivate the antibiotic. One approach...
Scanning tunneling microscopy (STM) has been used to image the surface structure of gasified highly oriented pyrolytic graphite (HOPG). Surfaces of HOPG were oxidized in air at 650°C by TGA to 5 and 30 wt% burnoffs. The pits that were formed following this oxidation were examined by STM. Removal of carbon atoms adjacent to the vacancy in the same plane as well as removal of carbon atoms in planes...
The aim of this work is to develop a low temperature sulphur resistant catalyst for coal steam gasification. The emphasis is placed on a single-step methane production.
The porous structure of a series of commercial activated carbon fibers (ACFs) (with increasing surface area) was studied using both direct and indirect methods. The porous structure was characterized directly using scanning tunneling microscopy (STM) techniques and indirectly using the Dubinin-Radushkevich-Stoeckli (D-R-S) equation applied to the nitrogen adsorption isotherm at 77 K. The porous...
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