NOVELTY - A carbon sequestration and dry reforming process involves contacting a reactant gas mixture (40) with catalyst(s) for dry reforming the reactant gas mixture and sequestering carbon, where one of the catalysts is a two-dimension carbon sequestration catalyst (24), under conditions where the reactant gas mixture is at least partly reformed into a product gas mixture including a synthesis gas and solid carbon particles are formed over the two-dimension carbon sequestration catalyst; and recovering the product gas mixture and the solid carbon particles.    USE - The carbon sequestration and dry reforming process is used for the production of synthesis gas and sequestered carbon from carbon dioxide, or of product gas mixture including synthesis gas and filamentous carbon material. The product gas mixture is used for a fuel cell. (All claimed)    ADVANTAGE - The catalysts maximize the carbon recovery. The dry reforming reactions sequester a proportion of the carbon in a carbon dioxide molecule, while producing synthesis gas from renewable resources, (e.g. biogas and bio-ethanol). The sequestered carbon forms an inert solid powder that is removed from the process, and simultaneously reducing greenhouse effect gas emissions.    DETAILED DESCRIPTION - A carbon sequestration and dry reforming process comprises providing a reactant gas mixture comprising carbon dioxide and an organic material; providing catalyst(s) for dry reforming the reactant gas mixture and sequestering carbon, where at least one of the catalysts is a two-dimension (2D) carbon sequestration catalyst; contacting the reactant gas mixture with the catalyst under conditions, where the reactant gas mixture is at least partly reformed into a product gas mixture including a synthesis gas and solid carbon particles are formed over the 2D carbon sequestration catalyst; and recovering the product gas mixture and the solid carbon particles. INDEPENDENT CLAIMS are included for:    (1) a filamentous carbon material resulting from the carbon sequestration and dry reforming process;    (2) a synthesis gas resulting from the carbon sequestration and dry reforming process;    (3) a carbon sequestration method in a dry reforming process, comprising bringing at least one of a reactant gas mixture including carbon dioxide and an organic material and a dry reformed gas in contact with the 2D carbon sequestration catalyst at a temperature where a solid carbon deposit is formed at the surface of the 2D carbon sequestration catalyst;    (4) a carbon sequestration and dry reforming reactor (20), comprising housing(s) having gas input(s) to receive a reactant gas mixture and gas output(s); catalyst(s) disposed in the housing for dry reforming the reactant gas mixture circulating into the product gas mixture and sequestering carbon; and a heater connected to the reactor for heating gas mixture(s) and the catalyst;    (5) a 2D dry reforming catalyst comprising an active metal deposited on non-porous support(s);    (6) a 2D dry reforming catalyst manufacturing process comprising depositing on the non-porous support a catalytic metal precursor from nickel, platinum group metals, promoted nickel, alkali-enhanced nickel, copper-promoted nickel, or tin-promoted nickel; and    (7) a 2D carbon sequestration catalyst comprising an iron-based superficial catalytic material activated by heating at inert gas atmosphere and 700-900degreesC.    DESCRIPTION OF DRAWING(S) - The figure is a schematic view of a reactor used in a carbon sequestration and dry reforming process.    Dry reforming reactor (20)    2D carbon sequestration catalyst (24)    Reactant gas mixture (40)    Thermocouples (44)    Pressure gages (46)