Topic
Calcium oxide
About: Calcium oxide is a research topic. Over the lifetime, 7600 publications have been published within this topic receiving 66104 citations. The topic is also known as: caustic lime & quicklime.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the authors used CaO as an additive of the fuel and bed material, and demonstrated that CaO could also be a good CO2 acceptor for the atmospheric gasification of biomass, provided the reaction temperature is appropriately low, such as not much over 973 K.
Abstract: Calcium oxide has long been recognized as an effective in-bed catalyst for reforming or cracking tars generated in thermally decomposing hydrocarbon fuels such as biomass. Under pressures as high as 20 atm, the oxide was also widely tested as a good CO2 acceptor to capture CO2 on-site to produce high-caloric pipeline gas from gasifying coal and coal−coke. By using CaO as an additive of the fuel and bed material, the research detailed in this research note demonstrated that CaO could also be a substantially good CO2 acceptor for the atmospheric gasification of biomass, provided the reaction temperature is appropriately low, such as not much over 973 K. At temperatures >1073 K, the additive exhibited basically the catalytic effect only, which led the H2 content of the product gas to increase and the tar release with the gas to decrease.
75 citations
TL;DR: In this article, preliminary studies of the chemical composition of individual particles and local areas in hydrated cement pastes were carried out using a scanning electron microscope-energy dispersive x-ray spectrometer combination.
75 citations
TL;DR: In this paper, thermal analysis of calcium chloride between 20°C and 1400°C in synthetic dry and humid flue gas atmosphere simulating firing methane with air was conducted in order to estimate the chlorination effect of different chlorine donors on heavy metals in sewage sludge ashes.
Abstract: In the last years chlorination has become an important industrial technique for the removal of heavy metal impurities (especially cadmium, copper, lead and zinc) in raw materials. In order to estimate the chlorination effect of different chlorine donors on heavy metals in sewage sludge ashes and the influence of gas humidity, the thermal decomposition behaviour of the chlorine donors was investigated. Therefore, thermal analysis of calcium chloride between 20 °C and 1400 °C in synthetic dry and humid flue gas atmosphere simulating firing methane with air was conducted in this work. In the first case the gas composition contained 12 v% oxygen, 5 v% carbon dioxide and 83 v% nitrogen whereas in the second case water vapour was added to the gas mixture in an amount to equal 10 v% of the total gas. In both cases (dry and humid flue gas), the first mass losses of calcium chloride up to 260 °C are based on the decomposition of its hydrates. Chlorine release occurs above the melting temperature of calcium chloride (782 °C) only: in the first case chlorine gas (Cl 2 ) by reaction of gaseous calcium chloride with oxygen and in the second case hydrogen chloride (HCl) by reaction with water vapour are formed. These different reaction products may influence the chlorination effect on heavy metals and further their removal in industrial processes. The solid reaction product is in both cases calcium oxide.
75 citations
TL;DR: In this paper, the effects of reaction conditions on the Fischer-Tropsch activity and product distribution of an alkali-earth metal promoted cobalt based catalyst were studied by different techniques, including N2 adsorption, X-ray diffraction, temperature-programmed reduction, temperatureprogrammed desorption and acid base titrations.
75 citations
75 citations