Hydrogen in the synthesis process of graphite


Based on the phase identification of solid products and composition analysis of gaseous products, the chemical interaction between CO2 and LiAlH4 can be described by the following equation: 10LiAlH4+9CO27C+6LiAlO2+2Li2CO3+4Al+20H2, where the theoretical molar ratio of LiAlO2 to Li2CO3 is very close to the experimental value of 2.97:1 determined by Rietveld refinement of XRD patterns. The theoretical mass ratio of solid products to reactants is 1.94:1, which is more than the experimental value of 1.84:1. This result is attributed to the evaporation of Al at the temperature of 660 °C, above its melting point. The decreasing Al content is calculated to be 3.3 wt% due to evaporation. To further confirm the chemical reaction (1), the solid products were subjected to TG analysis in the air. The weight change in solid products resulted from the air reaction with carbon and Al, and the decomposition of Li2CO3 is seen in the TG curves. The total weight loss is 10.3 wt%, consistent with the theoretical value of 10.8 wt%, in which 3.3 wt% Al loss and Eq. (1) are used to calculate the theoretical value. The heat released from the chemical reaction (1) is calculated to be 733.6 kJ mol−1 C based on the standard formation enthalpies of reactants and products by the exothermic nature. These results further demonstrate that the chemical interaction between CO2 and LiAlH4 can be expressed by Eq. (1). According to chemical reaction (1), the theoretical yield of graphite based on LiAlH4 is calculated to be 22.1 wt%, which corresponds closely to the experimental value of 20.7 wt% determined by the TG measurement of solid products of CO2 reacting with LiAlH4. The yield of graphite is as high as 93.7%. If you are looking for high quality, high purity, and cost-effective graphite or require the latest price, please email contact mis-asia.

Inquiry us

Our Latest Products

Factory 3-5nm Nanodiamond Powder CAS 7782-40-3

Brief Introduction of Nanodiamond PowderProduct name: Nanodiamond PowderFormular: C Product NameNanodiamond PowderPurity 99%Particle Size3-5nmAnalysis ResultChemical CompositionAnalysis (%)Al0.0046%Co0.007%Si0.079%Na0.002%K0.00015%Ca0.003%Mg0.00058%...…

CAS No. 557-05-1 40% Water-based Zinc Stearate Zinc Stearate Emulsion

Product DescriptionProduct Description Description of zinc stearate emulsionZinc stearate emulsion is easy to disperse in water, has ultra-fineness, good dispersion compatibility. Zinc stearate emulsion has the characteristics of lubricating and deli...…

China factory cheapest price lightweight concrete wall panel making machine large hydraulic cement foaming machine equipment

Product performance of TR-40 Cement Foaming Machine1. The shell is made of high-strength precision thickened steel plate, painted twice, which is durable.2. The slurry output is uniform and stable, the density of the foam concrete finished product i...…

0086-0379-64280201 brad@ihpa.net skype whatsapp