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Showing 1 to 14 of 14 for “"Acid washing"”.
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The effect of hydrothermal and acid dealumination on the structural, acid and catalytic properties of Mordenite
… of studies of the effect of hydrothermal and acid dealumination on the properties of Mordenite, there is a lack of clarity on many issues related to the changes which these treatments cause to the structure, acidity and catalytic activity of Mordenite. Both methods remove aluminium from the …
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The effect of synthesis and post-synthesis modifications on the activity of zeolite beta for cumene synthesis
… post synthesis modifications such as steaming, acid washing or steaming followed by acid washing. A series of zeolite Beta catalysts were also synthesised by different techniques. The samples were characterised with respect to structure, morphology, particle size, number of acid sites, …
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Deactivation and regeneration of immobilized titanium dioxide photocatalysts during treatment of pharmaceutical micropollutants in groundwater
… of deactivated catalysts with 10 mM hydrochloric acid was able to restore catalyst activity to pre-GW levels, so introduction of recurrent acid washing stages during GW treatment were investigated to prolong catalyst activity. Pretreatment of GW using a sodium-loaded cation exchange softening …
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Chemical and physical characterization of clay bodies
… small and large particleα-Fe203, removable via acid washing. 19F MAS NMR has demonstrated that the raw Whichford Pottery clays examined have negligible fluorine content. This is unlikely to be detrimental to ceramic wares during the heating process. A unique technique was used for the …
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Reaction Rates For The Dehalogenation Of Trichloroethylene Using Various Types Of Zero-valent Iron
… in this study, including ultrasonication and acid washing, demonstrated a beneficial effect by removing oxide precipitates from the iron surface, thus increasing the reactivity of the iron. Mass loading studies revealed how physical factors, associated with the experimental setup, could …
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Added-value chemicals from secondary and low-grade primary sources
… cake by oxidative precipitation using Caro's acid as an oxidant is also reported. Following encouraging laboratory studies the process was successfully tested on pilot scale at a copper nickel smelter. The cobalt level was brought down from 8.6 g/l to 50 ppm with the pH kept above 4. Studies …
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Fundamental studies of the behaviour of biomass and waste materials in gasification systems
… subjecting cereal straw and pine wood samples to acid washing in both 1M HNO₃ and HCl solutions. The ash contents were reduced in all cases and the resultant char yields and char reactivity were significantly lower than those of the parent materials.;When plotted on the char reactivity-CaO content …
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Investigation of alternative batteries systems beyond lithium-ion batteries
… Co present in the CoNC carbon host is tuned by acid-washing. Significant improvement in reversible sulfur conversion and capacity retention is observed with higher Co-content in CoNC, with 600 mAh/g and 77% capacity retention for CoNC, and 261 mAh/g and 56% capacity retention for acid-washed …
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A study on the use of indigenous New Zealand plant fibres for producing biomorphic hydroxyapatite fibres and chars used in reinforcing biomedical hydroxyapatite sourced from cattle bone
… HAp, which was then further processed through acid digestion and alkali neutralisation at varying reaction temperatures, to produce re-precipitated HAp. Further to this, the as-precipitated HAp powders were subsequently subjected to a high temperature calcination process to develop its …
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Mineral requirements of selected species of aquatic hyphomycetes
… containers and other equipment were cleaned by acid washing. When necessary to establish a nutritional reguirement for an element, the nutrient salts were purified by the phosphate adsorption and dithizone methods. In addition to nutrient salts and purified water, the media contained only …
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Strategies to Enable a Circular Economy in the Electronics Industry: Electrochemical Recovery of Metals
… and solid-based methods were utilized, with acid washing and full filter combustion giving the highest recovery values, near 100%. Metal selectivity between acids indicated potential for further separation capability. Finally, my observations from the other chapters identified many key design …
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Processing of Low Rank Coal and Ultrafine Particle Processing by Hydrophobic-Hydrophilic Separation (HHS)
This thesis pertains to the processing of ultra-fine mineral particles and low rank coal using the hydrophobic--hydrophilic separation (HHS) method. Several explorative experimental tests have been carried out to study the effect of the various physical and chemical parameters on the HHS process. …
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Utilization of Char from Biomass Gasification in Catalytic Applications
… of oxygen groups on the char surface and both acidic (lactone, carboxylic) and basic (pyrone, quinone) groups were identified. There were no significant differences in the concentration and type of surface oxygen groups amongst the different char samples. In order to understand the role that …
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Topological Structures in Ferroic Materials
… titanate, repaired using thermal annealing and acid washing, and their domain patterns mapped using PFM. Following this, 180 domains were written in the lamella using a voltage applied through the PFM tip, creating the appropriate 180 DW required for this project. This written domain remained …