The present disclosure relates to a catalyst composition comprising: (a) nickel; (b) at least one promoter selected from Cu Zn, Mo, Co, Mg, Ce, Ti, Zr, Fe, Pd, Ag, Pt, or combinations thereof; and (c) a support material, wherein, the nickel loading is in the range of 6-19 wt % and the at least one promoter loading is in the range of 0.2-5 wt % with respect to the support material. The present disclosure further discloses a process for preparing a catalyst composition and a process each for the production of hydrogen gas and carbon nanotubes. Also disclosed herein, is use of a catalyst composition for obtaining hydrogen gas and carbon nanotubes.

The present disclosure relates to a catalyst composition comprising: (a) nickel; (b) at least one promoter selected from Cu Zn, Mo, Co, Mg, Ce, Ti, Zr, Fe, Pd, Ag, Pt, or combinations thereof; and (c) a support material, wherein, the nickel loading is in the range of 6-19 wt % and the at least one promoter loading is in the range of 0.2-5 wt % with respect to the support material. The present disclosure further discloses a process for preparing a catalyst composition and a process each for the production of hydrogen gas and carbon nanotubes. Also disclosed herein, is use of a catalyst composition for obtaining hydrogen gas and carbon nanotubes.

The present subject matter relates to co-producing H-CNG and CNTs. The process comprises adding catalyst to a first reactor (110) and activating the catalyst and performing a reaction to obtain H-CNG and CNTs. At a first predetermined time after reaction has progressed in the first reactor (110), catalyst is added to a second reactor (120), activated, and then the reaction proceeds simultaneously in the first reactor (110) and second reactor (120). The use of multiple reactors with staggered start times helps in the continuous co-production of H-CNG and CNTs. Catalyst preparation process is integrated with the co-production process for efficient heat recovery. The first and second reactors are fluidized bed reactors with cantilever trays having weirs for controlling the residence time of the catalyst in the reactor and thereby controlling the purity of CNTs produced.

The present subject matter relates to co-producing H-CNG and CNTs. The process comprises adding catalyst to a first reactor (110) and activating the catalyst and performing a reaction to obtain H-CNG and CNTs. At a first predetermined time after reaction has progressed in the first reactor (110), catalyst is added to a second reactor (120), activated, and then the reaction proceeds simultaneously in the first reactor (110) and second reactor (120). The use of multiple reactors with staggered start times helps in the continuous co-production of H-CNG and CNTs. Catalyst preparation process is integrated with the co-production process for efficient heat recovery. The first and second reactors are fluidized bed reactors with cantilever trays having weirs for controlling the residence time of the catalyst in the reactor and thereby controlling the purity of CNTs produced.

Disclosed are a carbon nanotube (CNT)-based three-dimensional ordered macroporous (3DOM) carbon material and a preparation method thereof. The CNT-based 3DOM carbon material comprises a honeycomb network structure having a 3DOM structure formed by overlapping CNTs, wherein ordered macropores each have a diameter of 270 nm to 360 nm, and the CNTs each have an outer diameter of 8 nm to 20 nm

Carbon nanostructure are synthesized by pyrolyzing an organic material. The carbon nanostructures are synthesized on a stainless steel substrate that is reused. After synthesizing the carbon nanostructures, the stainless steel substrate is contacted with an acid, heated, quenched and reused for synthesis of carbon nanostructures.

Carbon nanostructure are synthesized by pyrolyzing an organic material. The carbon nanostructures are synthesized on a stainless steel substrate that is reused. After synthesizing the carbon nanostructures, the stainless steel substrate is contacted with an acid, heated, quenched and reused for synthesis of carbon nanostructures.

A reactor system and a related method that are configured to produce carbon-containing material by exposure of carbon-containing reaction gas to catalyst particles. The reactor system includes a reactor that contains a heated reaction volume wherein the reaction gas is exposed to the catalyst particles, at least one reaction gas entry port into the reaction volume, and at least one catalyst particle entry into the reaction volume. The catalyst particles are heated before they contact the reaction gas.

A reactor system and a related method that are configured to produce carbon-containing material by exposure of carbon-containing reaction gas to catalyst particles. The reactor system includes a reactor that contains a heated reaction volume wherein the reaction gas is exposed to the catalyst particles, at least one reaction gas entry port into the reaction volume, and at least one catalyst particle entry into the reaction volume. The catalyst particles are heated before they contact the reaction gas.

The present invention relates to entangled-type carbon nanotubes which have a bulk density of 31 kg/m.sup.3 to 85 kg/m.sup.3 and a ratio of tapped bulk density to bulk density of 1.37 to 2.05, and a method for preparing the entangled-type carbon nanotubes.