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.
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06 Aug 2014
TL;DR: In this paper, a surface coating modified nano calcium oxide based CO2 adsorbing agent which is composed of internal nano calcite oxide and an external surface coating layer is presented.
Abstract: The invention discloses a surface coating modified nano calcium oxide based CO2 adsorbing agent which is composed of internal nano calcium oxide and an external surface coating layer; the surface coating layer is prepared from at least one of Al2O3, Ca12Al14O33 and MgO. The invention further discloses a preparation method of the surface coating modified nano calcium oxide based CO2 adsorbing agent. An adsorption phase reaction method is utilized, and thickness and uniformity of the surface coating layer are controlled by controlling a reaction field, the method is simple and regulation and control are facilitated; according to the invention, the prepared surface coating modified nano calcium oxide based CO2 adsorbing agent has high CO2 adsorption capacity and obvious stability in adsorption ability in manifold cycles, can be in long-term recycling, and is an ideal adsorption agent in the adsorption process of high-temperature CO2.
17 citations
TL;DR: A 12.6A calcium silicate hydrate was synthesized by reacting amorphous silica and calcium oxide in the presence of a large excess of NaOH at 80-98°C as discussed by the authors.
17 citations
TL;DR: Magnetic recycled calcium oxide hollow fibers were successfully prepared for the transesterification of rapeseed oil with methanol to produce biodiesel as mentioned in this paper, and 95.7% biodiesel yield was achieved.
Abstract: Magnetic recycled calcium oxide hollow fibers were successfully prepared for the transesterification of rapeseed oil with methanol to produce biodiesel. The hollow fiber catalyst prepared from different molar ratios of metal ions, various annealing atmospheres and annealing temperatures were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, vibrating sample magnetometer, and Brunauer–Emmer–Teller surface area measurements. Under optimum conditions (Ca2+:Fe3+ = 1:2, reducing atmosphere annealing at 1000°C), magnetic calcium oxide hollow fibers with average pore size around 6.3061 nm, the surface area of 15.28 m−1, and saturation magnetization of 136.564 Am2 kg−1 were produced by organic gel-thermal decomposition. Then, their catalytic activities were studied, and 95.7% biodiesel yield was achieved. The catalyst was separated by a magnetic field and recycled 20 times, and 85.2% biodiesel yield was still obtained. Magnetic calcium oxide hollow fibers are active, stable, and easily separated green catalysts that may find practical uses in biodiesel industry. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 1255–1261, 2013
17 citations
17 citations
TL;DR: In this paper, an overall thermo-neutral process with high quality syngas as a useful byproduct, and a substantial decrease in CO2 release was designed, with a preliminary economic analysis indicates favorable competitiveness, even before the application of credit for CO2 avoidance.
Abstract: The calcination of limestone to produce lime and cement is characterized by its high-energy consumption and concomitant CO2 emissions to the atmosphere. By combining the calcination reaction with the partial oxidation and CO2-reforming of methane, an overall thermo-neutral process can be designed, with high-quality syngas as a useful byproduct, and a substantial decrease in CO2 release. The thermochemical boundary conditions for such a combined process are established. The thermodynamics are also examined with coal instead of methane as the fuel and carbon source. Adding H2O in the reaction mixture results in the coproduction of CaO and syngas with a H2/CO molar ratio of 2, suitable for methanol synthesis. A preliminary economic analysis indicates favorable competitiveness, even before the application of credit for CO2 avoidance. The fuel saving of the proposed coproduction vs the separate production may amount up to 70%, and the avoidance of CO2 emissions may reach 74%.
17 citations