One object of the present invention is to provide an apparatus for producing inorganic spheroidized particles which can significantly reduce the amount of warming gas generated and suppress the generation of soot during combustion. The present invention provides an apparatus (10) for producing inorganic spheroidized particles, including a burner (11) for producing inorganic spheroidized particles, a vertical spheroidizing furnace (15), an ammonia supply source (12), an oxygen supply source (13), an ammonia supply line (L1) located between the ammonia supply source (12) and the burner (11) for producing inorganic spheroidized particles, and an oxygen supply line (L2) located between the oxygen supply source (13) and the burner (11) for producing inorganic spheroidized particles.

One object of the present invention is to provide a burner for producing inorganic spheroidized particles which can efficiently melt and spheroidize even organic powder with a large particle size distribution. The present invention provides a burner for producing inorganic spheroidized particles, including; a raw material powder supply path configured to supply inorganic powder as raw material powder; a first fuel gas supply path (3A) configured to supply a first fuel gas; and a first combustion-supporting gas supply path (4A) configured to supply a first combustion-supporting gas; wherein the raw material powder supply path includes: a first supply path (2A) configured to extend in an axial direction of the burner (1); a first collision wall (2D) configured to be located at the top of the first supply path (2A); a plurality of second supply paths (2B) configured to be branched from the top of the first supply path (2A), and extend radially from the center of the burner (1); one or more dispersion chambers (2C) configured to be located at the top of the second supply path (2B), and have a space in which the cross-sectional area is larger than the cross-sectional area in the second supply path (2B); and one or more raw material ejection holes (2a) configured to communicate with the dispersion chamber (2C).

One object of the present invention is to provide a burner for producing inorganic spheroidized particles which can efficiently melt and spheroidize even organic powder with a large particle size distribution. The present invention provides a burner for producing inorganic spheroidized particles, including; a raw material powder supply path configured to supply inorganic powder as raw material powder; a first fuel gas supply path (3A) configured to supply a first fuel gas; and a first combustion-supporting gas supply path (4A) configured to supply a first combustion-supporting gas; wherein the raw material powder supply path includes: a first supply path (2A) configured to extend in an axial direction of the burner (1); a first collision wall (2D) configured to be located at the top of the first supply path (2A); a plurality of second supply paths (2B) configured to be branched from the top of the first supply path (2A), and extend radially from the center of the burner (1); one or more dispersion chambers (2C) configured to be located at the top of the second supply path (2B), and have a space in which the cross-sectional area is larger than the cross-sectional area in the second supply path (2B); and one or more raw material ejection holes (2a) configured to communicate with the dispersion chamber (2C).

Disclosed herein are aluminum oxide aerogels and methods of making and use thereof. The methods of making the aluminum oxide aerogel include contacting a solid comprising aluminum with a Ga-based liquid alloy to dissolve at least a portion of the aluminum from the solid, thereby forming an aluminum-alloy mixture; and contacting the aluminum-alloy mixture with a fluid comprising water, thereby forming the aluminum oxide aerogel. In some examples, the methods can further comprise capturing and converting carbon dioxide to a syngas comprising carbon monoxide and hydrogen.

Disclosed herein are aluminum oxide aerogels and methods of making and use thereof. The methods of making the aluminum oxide aerogel include contacting a solid comprising aluminum with a Ga-based liquid alloy to dissolve at least a portion of the aluminum from the solid, thereby forming an aluminum-alloy mixture; and contacting the aluminum-alloy mixture with a fluid comprising water, thereby forming the aluminum oxide aerogel. In some examples, the methods can further comprise capturing and converting carbon dioxide to a syngas comprising carbon monoxide and hydrogen.

Provided is an inorganic filler powder (3) having a structure in which at least a portion of the surface of inorganic particles (1) having a particle size of 1 μm or more is covered with inorganic microparticles (2) having a particle size of 10 nm or more and less than 0.1 μm, in which the coverage ratio of the surface of the inorganic particles (1) by the inorganic microparticles (2) is 30% or greater.

A method of preparing an alumina catalyst including: performing primary calcination of an alumina precursor at a primary calcination temperature to form a mixed-phase alumina including 1% to 15% by weight of alpha-alumina, 60% to 95% by weight of theta-alumina, and 4% to 25% by weight of delta-alumina; steam-treating the mixed-phase alumina with water vapor at a steam-treating temperature lower than the primary calcination temperature to form activated mixed-phase alumina; and performing secondary calcination of the activated mixed-phase alumina at a secondary calcination temperature higher than the steam treatment temperature and lower than the primary calcination temperature after step S2. An alumina catalyst prepared using the method, and a method of preparing propylene using the alumina catalyst.

A method of preparing an alumina catalyst including: performing primary calcination of an alumina precursor at a primary calcination temperature to form a mixed-phase alumina including 1% to 15% by weight of alpha-alumina, 60% to 95% by weight of theta-alumina, and 4% to 25% by weight of delta-alumina; steam-treating the mixed-phase alumina with water vapor at a steam-treating temperature lower than the primary calcination temperature to form activated mixed-phase alumina; and performing secondary calcination of the activated mixed-phase alumina at a secondary calcination temperature higher than the steam treatment temperature and lower than the primary calcination temperature after step S2. An alumina catalyst prepared using the method, and a method of preparing propylene using the alumina catalyst.

Sintering is an important issue in creating crystalline metal oxides with high porosity and surface area, especially in the case of high-temperature materials such as metal aluminates. Herein we report a rationally designed synthesis of metal aluminates that diminishes the surface area loss due to sintering. Metal aluminate (e.g. MeAl.sub.2O.sub.4or MeAlO.sub.3−Me=Mg, Mn, Fe, Ni, Co, Cu, La, or Ce; or mixture thereof) supported on γ-Al.sub.2O.sub.3 with ultralarge mesopores (up to 30 nm) was synthesized through microwave-assisted peptization of boehmite nanoparticles and their self-assembly in the presence of a triblock copolymer (Pluronic P123) and metal nitrates, followed by co-condensation and thermal treatment. The resulting materials showed the surface area up to about 410 m.sup.2.Math.g.sup.−1, porosity up to about 2.5 cm.sup.3.Math.g.sup.−1, and very good thermal stability. The observed enhancement in their thermomechanical resistance is associated with the faster formation of the metal aluminate phases. The nanometer scale path diffusion and highly defective interface of γ-alumina facilitate the counter diffusion of Me.sup.X+ and Al.sup.3+ species and further formation of the metal aluminate phase.

Sintering is an important issue in creating crystalline metal oxides with high porosity and surface area, especially in the case of high-temperature materials such as metal aluminates. Herein we report a rationally designed synthesis of metal aluminates that diminishes the surface area loss due to sintering. Metal aluminate (e.g. MeAl.sub.2O.sub.4or MeAlO.sub.3−Me=Mg, Mn, Fe, Ni, Co, Cu, La, or Ce; or mixture thereof) supported on γ-Al.sub.2O.sub.3 with ultralarge mesopores (up to 30 nm) was synthesized through microwave-assisted peptization of boehmite nanoparticles and their self-assembly in the presence of a triblock copolymer (Pluronic P123) and metal nitrates, followed by co-condensation and thermal treatment. The resulting materials showed the surface area up to about 410 m.sup.2.Math.g.sup.−1, porosity up to about 2.5 cm.sup.3.Math.g.sup.−1, and very good thermal stability. The observed enhancement in their thermomechanical resistance is associated with the faster formation of the metal aluminate phases. The nanometer scale path diffusion and highly defective interface of γ-alumina facilitate the counter diffusion of Me.sup.X+ and Al.sup.3+ species and further formation of the metal aluminate phase.