David Lokhat

David Lokhat, Maciej Starzak, Marek Stelmachowski
The performance of an 8 wt% WO3/SiO2 catalyst has been investigated for the metathesis of 1-hexene in a gas-phase fixed-bed reactor. The operating conditions (reaction temperature, feed composition and space time) were optimized for the yield of decene, the primary metathesis product, using a full factorial experimental design and a probabilistic two-factor search.

David Lokhat, Ashveer Krishen Domah, Kuveshan Padayachee, Aman Baboolal, Deresh Ramjugernath
In the current study the influence of reaction plate orientation and gas flowrate on liquid-side mass transfer coefficient was investigated via CO2 absorption experiments. Lower plate angles resulted in lower liquid-side mass transfer coefficients. At higher film velocities the rate of mass transfer was greater.

David Lokhat, Mike Oliver, Milan Carsky
A series of iron oxide nanocatalysts were prepared using an ultrasonically assisted co-precipitation technique. Molybdenum promoted Fe3O4 and Fe2O3 were prepared from the original materials by wet impregnation using a solution of ammonium molybdate. The catalysts were tested in the liquid phase oxidation of benzene at atmospheric pressure .

Ethan Gabriel Hammond, Shaheen Amed Faizal Moonsamy, David Lokhat, Milan Carsky
A kinetic model for direct coal liquefaction at low temperature in the presence of a magnetite nano-catalyst was developed. The model took into account the iron oxide catalyst transformation into its active state as well as the process of reactive dissolution of coal at the reduced temperatures.

Ethan Hammond, David Lokhat
The performance of ZSM-5, γ-Al2O3 and WO3/SiO2 catalysts for the dehydration of methanol was studied in a fixed bed reactor over a temperature range of 150 to 450 °C and at atmospheric pressure. A parallel reaction scheme for dehydration of methanol to dimethyl ether and methane was proposed for the WO3/SiO2 catalyst, and kinetic parameters for the two reactions were identified.

Ali Alhafiz Mohammed, David Lokhat
In this work, we present a review dedicated to falling film microreactors, focusing on the recent advances in their design and operation, with particular emphasis on mass transfer enhancement.

David Lokhat, Milan Carsky
Iron carbonyl powder as an alternative first‐stage catalyst was investigated. A series of experimental tests under mild liquefaction conditions were carried out with a high‐pressure batch reactor in order to compare the performance of the iron carbonyl precursor to the traditional superfine iron oxide catalyst. The carbonyl iron powder performed very well in terms of total conversion of coal as well as yield of coal oil product.

David Lokhat, Ashish Singh, Maciej Starzak, Deresh Ramjugernath
In this study, the design and analysis of a 500 tpa continuous gas-phase process for the epoxidation of HFP with molecular oxygen was carried out. A modular coil-type reactor fabricated from drawn copper tubing is proposed to attain residence times up to 120 s which are required for acceptable levels of HFP conversion (70%) and HFPO yield (40%).