The present invention relates to a method of preparing a hollow carbon structure. The method includes a step of calcining a solid component separated after a cracking reaction of a heavy hydrocarbon fraction; and a step of performing an acid treatment or base treatment on the solid component calcined in the above-described step. The present invention provides a method of preparing a hollow carbon structure which may be used to separate carbon dioxide, to remove a sulfur compound, and as a carrier of various substances by performing various pre-processes on carbon generated on a surface of a spent catalyst which is used in a cracking reaction of a heavy hydrocarbon fraction.

The present inventive concept relates to an aluminosilicate structure body with a novel crystal structure and, more specifically, to an aluminosilicate structure body having a novel crystal structure and a skein-shaped morphology, a method for preparing the same, and an HPLC column filled with the same as a stationary phase. The aluminosilicate structure body according to the present inventive concept has a novel crystal structure and a skein-shaped morphology, and thus has a specific surface area increased to up to 300 m.sup.2/g so as to improve separation ability; and does not undergo a structural change with pH changes, and thus can be usefully used in a wider range of pH conditions than existing silica gel which has been conventionally used as a stationary phase for HPLC columns.

The present disclosure relates to the technical field of carbon black materials, and particularly to a granular carbon black and a preparation method therefor, an electrode and a secondary battery. For the granular carbon black, particle size distribution of the granular carbon black ranges as follows: a weight percent of granular carbon black with a particle diameter less than 0.125 mm is equal to or less than 2%, a weight percent of granular carbon black with a particle diameter ranging from 0.125 to 0.85 mm is from 18% to 60%, and a weight percent of granular carbon black with a particle diameter more than 0.85 mm is from 40% to 80%; and a secondary particle diameter D50 of the granular carbon black ranges from 2.0 m to 3.51 m.

The present application belongs to the field of lithium battery technology, particularly relating to a preparation method for injected lithium manganese iron phosphate cathode material, electrodes, and lithium batteries. The method comprises: mixing, grinding, and drying lithium source, iron source, phosphorus source, and carbon source to obtain a lithium iron phosphate precursor; The lithium iron phosphate precursor is subjected to a first stage sintering and a second stage sintering in an inert gas atmosphere to obtain lithium iron phosphate material; The lithium iron phosphate material is processed into a flaky form, and manganese ions are implanted on both sides of the flaky lithium iron phosphate material in a preset vacuum degree environment to obtain lithium manganese iron phosphate cathode material.

A composite material comprising carbon nanotubes is described, wherein said composite material does not comprise any carbon nanotube aggregates having a smallest dimension larger than 1 mm. The efficiency of dispersion and anchoring as well as processing capability of the commercially relevant carbon nanotube composites are significantly improved.

Provided is a method for regenerating a carbon fiber bundle from a structure having a hollow substrate, and a carbon fiber reinforced resin layer including a carbon fiber bundle wound on the hollow substrate, and a matrix resin, the structure including an opening provided in at least one end portion in a longitudinal direction, the method including a suspending process of suspending the structure by fixing the end portion that is disposed on an upper side in a vertical direction and has the opening provided therein, without closing the opening, a first heating process of heating the suspended structure to decompose the matrix resin, an unwinding process of unwinding an intermediate carbon fiber bundle to which decomposition residue of the matrix resin is adhering from the carbon fiber reinforced resin layer in which the matrix resin is decomposed.

A secondary growth procedure described herein is used to prepare finned zeolites. The finned zeolites possess properties that are distinctly unique compared to crystals of similar size lacking fins. The procedure is amenable to a wide range of zeolite crystal structures.

Compositions for pyrolysis coke particles are provided. The pyrolysis coke particles can have at least an outer shell of pyrolysis coke. In some aspects, the pyrolysis coke particles can be based on a homogeneous seed, so that the entire particle corresponds to pyrolysis coke and/or the particle consists essentially of pyrolysis coke. In other aspects, the particle can be based on a heterogeneous seed, so that a different type of carbon-containing material serves as the core of a particle. Systems and methods for forming such particles are also provided.

A cubic boron nitride particle population having highly-etched surfaces and a high toughness index is produced by blending a reactive metal powder with a plurality of cubic boron nitride particles to form a blended mixture. The blended mixture is compressed to form a compressed mixture. The compressed mixture is subjected to a temperature and a pressure, where the temperature is controlled to cause etching of the plurality of cubic boron nitride particles by reaction of cubic boron nitride with the reactive metal powder, thereby forming a plurality of etched cubic boron nitride particles. Also, the temperature and pressure are controlled to cause boron nitride to remain in a cubic boron nitride phase. Afterwards, the plurality of etched cubic boron nitride particles is recovered from the compressed mixture to form the particle population. Preferably, the particle population contains no hexagonal boron nitride.

A secondary growth procedure described herein is used to prepare finned zeolites. The finned zeolites possess properties that are distinctly unique compared to crystals of similar size lacking fins. The procedure is amenable to a wide range of zeolite crystal structures.