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Climate change and severe emission regulations in many countries demand fuel and engine researchers to explore sustainable fuels for internal combustion engines. Natural gas could be a source of sustainable fuels, which can be produced from renewable sources. This article presents a complete overview of the liquefied natural gas (LNG) as a potential fuel for diesel engines. An interesting finding from this review is that engine modification and proper utilization of LNG significantly improve system efficiency and reduce greenhouse gas (GHG) emissions, which is extremely helpful to sustainable development. Moreover, some major recent researches are also analyzed to find out drawbacks, advancement and future research potential of the technology. One of the major challenges of LNG is its higher flammability that causes different fatal hazards and when using in dual-fuel engine causes knock. Though researchers have been successful to find out some ways to overcome some challenges, further research is necessary to reduce the hazards and make the fuel more effective and environment-friendly when using as a fuel for a diesel engine.

The aim of this paper is to review the articles corresponding to the potentiality of biodiesel generation in Bangladesh. Many researchers gave their opinions and results related to their experiments for producing bio-fuel in Bangladesh. The potentiality of biofuel from different edible sources like mustard oil, coconut oil, sesame oil, mosna oil, soybean oil etc. and different non-edible sources like castor oil, rice bran oil, Jatropha curcas oil, karanja oil, microalgae oil, rubber seed oil, neem oil, linseed oil etc. are studied here. The properties and the uses of biofuels in diesel engine and their performances are also reviewed in this paper. The emission characteristics are reviewed and investigated too. Moreover, the cost analysis of biofuel compared to the other fuels is inspected here. All types of research related to biofuel are thoroughly reviewed. The main and important challenges to use biofuel and their solutions are given by authors in this research article. This paper presents the scopes of applying technologies to improve the sustainability of bio-fuel in respect of Bangladesh.

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