Progress in carbon emission reduction technology in fossil fuel-based hydrogen production

Today, almost all hydrogen production is based on fossil fuels. Hydrogen production plants contribute to harmful emissions in the atmosphere, which is one of the causes of global warming. In order to obtain hydrogen as an entirely green energy source, there is an urgent requirement to significantly reduce or even completely eliminate carbon emissions from fossil fuel-based hydrogen production processes. In this context, new efforts should be increased to develop hydrogen production technologies that produce lower levels of harmful emissions. The development of carbon capture technology by the chemical cycle offers great potential to reduce harmful emissions generated during hydrogen production from fossil fuels. In this study, hydrogen production methods from fossil sources have been reviewed and the recent studies of chemical looping technology for hydrogen production were presented.