**1. Introduction**

The synthesis gas is defined as a gas with H2 and CO as the main components of fuel. Row syngas contains mainly significant amounts of CO2 and H2O as well. Since syngas is usually used at higher pressures for synthesizing chemicals and fuels (**Figure 1**), the N2 contents must usually be minimized in syngas. Bio-syngas, however, are biomass produced, chemically identical to syngas. This definition is in accordance with the SYNBIOS-conference definition.

Syngas differ chemically from gasses normally generated by gasification processes at low temperatures, including fluidized bed reactors [1]. To be clear, the gas produced by such reactors is referred to in this report as "product gas." Product gas is defined as a fuel gas with H2 and CO as well as with substantial amounts of hydrocarbons, such as methane. Product gas contains CO2 and H2O, and often N2, also inevitably.

Throughout the chemical industry, syngas is a substantial intermediate product. Each year, around 6 EJ of syngas are manufactured globally, which is almost 2% of the world's current primary energy consumption. The ammonia industry dominates the global market for syngas (mainly from fossil fuels like coal, natural gas, and oil/ residues) [2]. The production of hydrogen for use in refineries, for instance, the processing of hydrogen, and methanol are other major applications. The current market distribution of syngas is shown in **Figure 1**.

**Figure 1.** *Present world syngas market, totally ~6 EJ/y.*
