Dihydrogen can be prepared on a commercial scale by the action of steam on hydrocarbons, when a mixture of CO and Hz gas is formed. It is known as

Dihydrogen is commercially prepared through the action of steam on hydrocarbons at high temperatures, a process known as steam-methane reforming or gasification [2]. This reaction produces a mixture of carbon monoxide (CO) and hydrogen (H2) [2]. This specific mixture is historically and technically referred to as 'water gas' [1]. Because this mixture is also used in the synthesis of methanol and various hydrocarbons, it is frequently called synthesis gas or 'syngas' [3]. In contrast, producer gas is a mixture of CO and N2 formed by passing air and steam over red-hot fuel, which has a lower calorific value due to the presence of atmospheric nitrogen [3]. The production of water gas from hydrocarbons or coke remains a fundamental industrial method for generating hydrogen for ammonia synthesis and other chemical applications [6].

Sources

1. [1] https://www.sciencedirect.com/topics/engineering/steam-gasification
2. [2] https://www.energy.gov/eere/fuelcells/hydrogen-production-natural-gas-reforming
3. [3] https://ptacts.uspto.gov/ptacts/public-informations/petitions/1558401/download-documents?artifactId=msU0LMX4qXTtFGUjoU22Y1-loVPpPbxeFTcDR1G_Fa5AN_DwGSdIi94
4. [5] https://en.wikipedia.org/wiki/Water–gas_shift_reaction
5. [6] https://en.wikipedia.org/wiki/Water_gas