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    Techno-economic review assessment of hydrogen utilization in processing the natural gas and biofuels
    (Elsevier Ltd, 2022) Narayanan R., Deepak; Rajkumar, Sundararajan; N., Vinithkrishna; Thangaraja, Jeyaseelan; M., Sivagaminathan; Devarajan, Yuvarajan; Geo Varuvel, Edwin
    The automobile sector dominated by conventional fossil fuels greatly impacted human lives and strengthened the economy of many countries. However, the harmful emissions from the engines have contaminated the environment and induced severe climate changes; hence the emphasis is being laid on low carbon fuels that emit lower emissions and greenhouse gases. In this regard, hydrogen (H2) is considered as a no-carbon fuel; however, safety and storage are the main concerns. Therefore, the H2 can be potentially utilized with compressed natural gas (CNG) to form hydrogen-enriched compressed natural gas (HCNG) and processed with biofuels to produce hydrogenated biofuels. HCNG emits 20% lower carbon dioxide, 30% less carbon monoxide and 25% reductions in NOx emissions compared with CNG. The hydrogenated biodiesel fuels exhibit higher cetane number and better storage stability. However, the practical challenge is to render them economically affordable with minimum carbon footprints. Thus, the current review is aimed to provide comprehensive detail on the potential of hydrogen in fuel formulation techniques and their effect on engine performance, emission characteristics and various hydrogen production methods viz. blue and green hydrogen. Further, this review highlights the techno-economic characteristics of hydrogen utilization and economic characteristics of the low carbon fuels (both liquid and gaseous fuels) for sustainable mobility.