Conversion reaction of graphite from CO2


The XRD pattern of the solid products of CO2 reacting with LiAlH4 is illustrated. The strong characteristic XRD peaks of LiAlO2, Li2CO3, and Al are seen in the XRD pattern, signifying the chemical interaction between CO2 and LiAlH4 in the exothermic process. According to the Rietveld refinement result, the weight ratio of LiAlO2 to Li2CO3 is calculated to be 77:23, equal to a molar ratio of 2.97:1. The weight ratio of Al to LiAlO2 or Li2CO3 is inaccurate based on the Rietveld refinement method as serious particle aggregation of Al is observed in the above solid products H, H2, CO2, CO, C, and O signals were detected in the gaseous products of CO2 reacting with LiAlH4. The observation of H and H2 signals implies hydrogen generation in the graphite synthesis process. H signal originates from the decomposition of H2 during the mass spectrum (MS) measurement. Excessive CO2 is the main reason for detecting CO2, CO, C, and O signals in the MS of gaseous products. The MS signals will be the same if CO is produced in the synthesis process of graphite. CO can be identified in the gas mixture of CO and CO2 by Fourier transform infrared (FTIR) spectra. As shown in FTIR spectra, the characteristic absorption of CO2 is observed in the wavenumber range of 2250–2400 cm−1, whereas the absorption of CO is not seen in the wavenumber range of 2000–2250 cm−1. The FTIR and MS results indicate that CO is not produced in the above synthesis process, and hydrogen is the only newly developed gas product. If you are looking for high quality, high purity, and cost-effective graphite or require the latest price, please email contact mis-asia.

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