RE: Chemical Composition of Syngas28 Jan 2019 13:24
Just to briefly recap what has been discussed on here on several occasions:
The gasification process itself is totally "green" because no CO2 is released and no CO2 is contained within the syngas (or, as PHE call it, "ecogas".) However, once they strip out the hydrogen either for use as a vehicle fuel, or for use with fuel cells to generate electricity, what is left over is methane (CH4) and carbon monoxide (CO). When this is used as a fuel to generate electricity, or burned, then carbon dioxide (CO2) is produced and released. So in that sense, the entire process is not carbon neutral.
However, KA has stated that in producing one tonne of hydrogen using the DMG process, which presumably includes the use of the remainder of the ecogas to produce electricity, the amount of CO2 produced by the entire process is one-sixteenth of the amount of CO2 that would be produced using steam methane reformation, which is the common process for the manufacture of hydrogen.
So although the PHE process may not be carbon neutral in its entirety, it is substantially more "green" than the alternative processes for the production of hydrogen. Not to mention the tremendous benefit of making plastic waste vanish!