Not all hydrogen is the same. A distinction can be made between different "colours". There is blue, green, grey and turquoise. These different types of hydrogen differ in the processes that are necessary for their production. In the case of green hydrogen, for example, a water molecule is split into oxygen and hydrogen by regeneratively generated electricity. No additional CO2 is produced in the process. The hydrogen is thus produced in a climate-neutral way.

1.Fuel Cell

In a fuel cell stack, hydrogen and oxygen from the ambient air are converted directly and thus highly efficiently into electrical energy. This drives the vehicle's electric motor.

The controlled reaction of hydrogen and oxygen produces only heat and water in addition to electricity – locally, the vehicle is emission-free. A battery serves as a buffer store so that the electrical energy can be called up at any time.

2. Combustion

Hydrogen can also be used in reciprocating engines as a sustainable alternative to gasoline or diesel as a fuel without major adaptation effort.

With intake manifold injection, the hydrogen is mixed with air before it enters the combustion chamber. This mixture is then ignited and generates mechanical work that powers the vehicle.

Also known is the direct injection process, in which the hydrogen is injected directly into the combustion chamber and then ignited there.

Systems for
both Technology Types

Poppe + Potthoff supplies hydrogen lines with certified interfaces, subsystems for H2 injection, and other components for hydrogen powertrains at system pressures up to 700 bar.


The lines developed and manufactured by Poppe + Potthoff are suitable for hydrogen applications. For improved safety, the line can be supplied with a certified interface. The metallic upsetting head connection allows repeated assembly.


The H2 rail developed by P+P can be used with both intake manifold injection and the direct injection process. During operation, the rail provides the hydrogen for the injectors and distributes it to them. Additionally, it reduces the pressure pulsations.

In addition, P+P supplies rails that are used in the storage and distribution system of the vehicle. During refuelling, the hydrogen is distributed via the rail to the storage tanks in the vehicle.


The advantages of hydrogen propulsion come into play particularly in commercial vehicle applications, but a hydrogen drive can also be used in other mobile and stationary applications. In both cases, P+P's system-relevant components can contribute to a safe and efficient conduction of the highly volatile hydrogen within the vehicle.

More about our H2 products


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