Conversion of CO2 to value-added chemicals not only reduces its release to the atmosphere but also result in economic benefits to investors. The process of converting CO2 to hydrocarbons, syngas, oxygenates and aromatics has got huge response from the scientific community as these molecules are important raw materials for plastics and polymers, fine chemicals and petrochemicals. Various studies are recently reported that evaluate the effective utilization of different materials for the catalytic applications, viz. CO2 valorization (Pawelec et al. 2021), ketonization (Weber et al. 2019), adsorption (Wang, Ang, and Tadé 2008). CO2 hydrogenation (Russkikh et al. 2020) is also reported to an effective process to convert CO2 into hydrocarbons. The samples are characterized thoroughly and the results are showed in Table 1. It is observed that there is significant difference in surface and basicity of different samples, as given in Table 1. Cat-1 catalyst showed 12.17% CO2 conversion whereas Cat-2 and Cat-3 showed 13.47 and 14.35% CO2 conversion, respectively as shown in Table 2 and Figure 1. CO is a significant product in Cat-1, whereas methane is produced in equal amounts over Cat-2 and Cat-3. Upon modifying with the promoter, Cat-3 samples showed significant improvement in olefin formation which is also reflected in its affinity towards NH3 and CO2. Acidity values reduced and Basicity value increased, which may enhance the CO2 adsorption and further its reaction with H2 to produce desired products. In the similar way, aromatics formation is also enhanced over Cat-2 and Cat-3 as compared. Even though the aromatics production is marginal in quantity, being a high value commodity produced over a cheap catalyst utilizing harmful chemical CO2.

Mixed metal oxides as catalyst/carrier for CO2 conversion to paraffines, olefins and aromatics

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