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A bifunctional NiPb/ZnO-diatomite-ZSM-5 (NiPb/ZnO-DZSM-5) catalyst for FCC gasoline upgrading by reactive adsorption desulfurization (RADS) coupling olefin aromatization function was prepared by wet-mixed squeezed method to avoid octane number loss from olefins hydro-saturation in traditional RADS processing. The crystalline structure and textural property of as-prepared adsorbents/catalysts were...
Pd–Cu alloy membrane was prepared by electroless plating on porous stainless steel (PSS) support. Sol–gel derived ceria was introduced as the intermediate layer by a sol-dip-coating method to prevent intermetallic diffusion and to enhance the affinity between the support and membrane. Ceria layer moderates the pore size and porosity of the support effectively to meet the needs of the alloy layer deposition...
A computational fluid dynamic modelling study of a jet fluidised bed gasifier has been carried out. The modelling was based on the Eulerian–Eulerian models for gas and solid flows, which take into account the hydrodynamics, mass and heat transfer, and heterogeneous and homogeneous reactions. The bubble dynamics was simulated in detail, enabling its effect on temperature distributions, gasification...
A previous one-dimensional numerical isothermal model of a fluidised-bed coal gasifier has been further improved to consider the non-isothermal behaviour of gases and heat transfer mechanisms in the fluidised-bed. Comparisons were made with data simulating the performance of a full-scale fluidised-bed coal gasifier, a 2MWth pilot plant and a laboratory-scale bed. Simulation results indicate that comparisons...
Low-temperature pyrolysis of putrescible garbage (PG) and mixtures of PG with sewage sludge (SS) was investigated with the aim to study the mechanisms and product distribution and to identify optimum process conditions for maximising the fuel oil yield. Experiments were performed in two rotary kiln type reactors in series, where the reaction temperature between 400 and 550°C and solid retention time...
A previous mathematical model developed for a bubbling fluidised-bed coal gasifier was modified for simulating the performance of a laboratory-scale gasifier with feeds of both Yallourn char and propane by incorporating propane decomposition and combustion reactions and reaction kinetics. Model predictions of the in-bed axial gas concentration profiles for O 2 , CO, CO 2 , CH 4...
Pyrolysis of activated sewage sludge was investigated under inert conditions in a fluidised-bed to study the effects of temperature and gas residence time on the product distribution and composition with an aim to maximise the oil yield. The temperature was varied from 300 to 600 o C and the gas residence time from 1.5 to 3.5s. Three groups of products were produced, namely, a non-condensable...
Temperature-programmed pyrolysis (TPP) experiments are conducted on several samples prepared from a South Australian Bowmans coal, viz. raw, water-washed, acid-washed and Ca++ and Na+ ion-exchanged acid-washed samples, to study the influence of the physically absorbed (water-soluble) and organically bound (acid-soluble) inorganic matter on sulphur transformations during pyrolysis. Changes in sulphur...
A laboratory investigation into the effect of inorganic matter on spontaneous combustion behaviour of a Victorian brown coal. Fourteen samples were prepared, namely, the raw coal, water-washed coal, acid-washed coal, and acid-washed coal doped with 11 additives. Each of the samples was then tested in an isothermal reactor to obtain its critical ambient temperature, above which spontaneous combustion...
An isothermal model, incorporating the two-phase theory, has been developed to evaluate the performance of a bubbling fluidised-bed coal gasifier. A distinctive feature of this model is the consideration of a net flow term from the emulsion phase to the bubble phase in the conservation equations. Simulations with consideration of the net flow term indicate that the overall results compare favourably...
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