TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred System: In the system for mixed production of hydrogen gas, carbon materials and carbon monoxide gas, the internal surface of the wall is slanted at an angle such that the upper portion is larger than the lower portion. When a vertical cross section is taken at the chamber the wall generally resembles the letter V. A horizontal cross section of the chemical vapor deposition chamber, Ach, is determined by a mathematical equation given in the specification. The protrusions are configured to take the form of one or more rings, where the rings are continuous. The rings together define gas circulation chambers. The protrusions together define pockets of cavities for collecting nano-carbons produced in the reaction chamber. The reaction chamber contains fluidized solid bed material derived from materials from a gasification process running in cooperation or parallel with production of hydrogen gas or splitting of hydrocarbon gas. The carbon generated from the fluidized solid bed material or the reaction chamber is fed into a gasifier for gasification for increasing the yield of hydrogen production. Alternatively, the A system for production of hydrogen gas, carbon materials and/or carbon monoxide gas comprises a chamber for gasification, a chamber for combustion and a chamber for chemical vapor deposition, where: (a) the gasification chamber and the combustion chamber are connected by a first channel configured to allow materials to travel from the gasification chamber to the combustion chamber; (b) a second channel configured to allow materials to return from the combustion chamber to the gasification chamber; (c) a third channel configured to allow materials to be fed from the gasification chamber into the chemical vapor deposition chamber; and (d) a fourth channel configured to allow materials from the combustion chamber to fed into the chemical vapor deposition chamber. The system comprises a source to provide heating to the combustion chamber, where the source includes fossil fuels combustion, electricity, waste heat installations such as solar/thermal collection, gasification, hydro-cracking or steam reforming of fossil fuels or the combination. The third channel is configured to feed hot synthesized gas from the gasification chamber into the chemical vapor deposition chamber. The third channel comprises means for providing additional heating to the hot synthesized gas before the hot synthesized gas enters the chemical vapor deposition chamber. The system comprises an auxiliary heating unit arranged to supply heat to the third channel such that content passing via the third channel may be heated before entering the chemical vapor deposition chamber. The fourth channel is configured to pass through the chemical vapor deposition chamber such that heat from exhaust gas in the fourth channel is transferred to the chemical vapor deposition chamber. The system comprises a heat exchanger arranged to transfer heat from the gasification chamber and the combustion chamber to the chemical vapor deposition chamber. The heat exchanger is located between or adjacent the third channel and the fourth channel. The system is free of cooling devices. The chemical vapor deposition chamber includes an upwardly extending wall defining a cavity having a lower portion and an upper portion with the upper portion having a volume capacity larger than a volume capacity of the lower portion, and where the wall defines an internal surface provided with a set of protrusions extending into the cavity for reducing horizontal cross section of the cavity at it. The gasification chamber and the chemical vapor deposition chamber are configured to allow synthesized gas to down-drift through heat exchanging channels to the chemical vapor deposition chamber separated from the gasification chamber. The chemical vapor deposition chamber contains fluidized solid bed material derived from materials from a gasification process running in cooperation or parallel with production of hydrogen gas or splitting of hydrocarbon gas. The carbon generated on the fluidized solid bed material is fed into the gasification chamber for increasing the yield of hydrogen production. In the system for producing hydrogen, the catalyst support comprises forms or is comprised in the bed of fluidized solid bed materials, and is selected from an activated carbon-based material, graphite, diamond, buckminsterfullerene, microcrystalline graphite, glassy carbon, diamond powder, carbon fullerene, carbon nano-fibers and carbon nano-tubes. Preferred Method: In producing hydrogen, the catalyst support comprises forms or is comprised in the bed of fluidized solid bed materials, and is selected from an activated carbon-based material, graphite, diamond, buckminsterfullerene, microcrystalline graphite, glassy carbon, diamond powder, carbon fullerene, carbon nano-fibers and carbon nano-tubes.