Despite significant progress in the synthesis of nanocomposite materials, integration of several components with various functions remains a big challenge, which significantly limits control over nanocomposite properties. The disclosure provides a multifunctional micro particle based on incorporation of titania nanoparticles combined into a porous polylactic acid (PLA) matrix. PLA is used as a biodegradable and biocompatible polymer and titania nanoparticles represent photocatalytically active nanofillers capable of degradation of organic compounds under solar irradiation. Titania nanoparticles are integrated with PLA by using ‘mixed’ and ‘in situ grown’ approaches. The hybrid systems effectively absorbed and degraded organic impurities from water. The sorption capacity, dye degradability, and PLA disintegration were controlled by varying the concentration of incorporated titania. The hybrid degradable systems can be applied as novel non-toxic photocatalytic materials for such as environmental cleanup of contaminated waters.

Disclosed herein are a dehydrogenation catalyst having single-atom cobalt loaded onto a silica support that has undergone pretreatment including a thermal treatment and a high-temperature aqueous treatment (reaction), a preparation method therefor, and a method for producing olefins by dehydrogenating corresponding paraffins, particularly light paraffins in the presence of the dehydrogenation catalyst.

In the present disclosure, a dehydrogenation catalyst in which cobalt in the form of single atom is supported on an inorganic oxide (specifically, silica) support in which an alkali metal in the form of single atom is fixed by alkali metal pretreatment and a method for producing the same, and a method for producing olefins by dehydrogenating corresponding paraffins, specifically light paraffins in the presence of the dehydrogenation catalyst are described.

The present invention is a catalyst comprising: (i) a compound comprising at least one first metal element selected from boron, magnesium, zirconium, and hafnium, and (ii) an alkali metal element, wherein the compound and the alkali metal element are supported on a carrier having silanol groups, an average particle size of the compound of the first metal element is 0.4 nm or more and 50 nm or less, the catalyst satisfies the following formula (1):

0.90×10.sup.−21 (g/number)≤X/(Y×Z)<10.8×10.sup.−21 (g/number)   formula (1), in which X is a molar ratio of the alkali metal element to the at least one first metal element in the catalyst, Y is a BET specific surface area of the catalyst (m.sup.2/g), and Z is a number of the silanol groups per unit area (number/nm.sup.2).

Described herein are multi-functionalized hollow fiber organocatalysts, processes for producing multi-functionalized hollow fiber organocatalysts, and processes that utilize multi-functionalized hollow fiber organocatalysts for reacting chemicals. A variety of chemical reactions may be enhanced with the multifunctional hollow fiber organocatalysts. The multi-functionalized hollow fiber organocatalysts are particularly advantageous when used as heterogeneous organocatalysts and continuous-flow reactors.

The present invention relates to a process for hydroconversion of a heavy hydrocarbon feedstock in the presence of hydrogen, at least one supported solid catalyst and at least one dispersed solid catalyst obtained from at least one salt of a heteropolyanion combining molybdenum and at least one metal selected from cobalt and nickel in a Strandberg, Keggin, lacunary Keggin or substituted lacunary Keggin structure.

Methods for making a supported chromium catalyst are disclosed, and can comprise contacting a silica-coated alumina containing at least 30 wt. % silica with a chromium-containing compound in a liquid, drying, and calcining in an oxidizing atmosphere at a peak temperature of at least 650° C. to form the supported chromium catalyst. The supported chromium catalyst can contain from 0.01 to 20 wt. % chromium, and typically can have a pore volume from 0.5 to 2 mL/g and a BET surface area from 275 to 550 m.sup.2/g. The supported chromium catalyst subsequently can be used to polymerize olefins to produce, for example, ethylene-based homopolymers and copolymers having high molecular weights and broad molecular weight distributions.

A fiber bundle contactor may include: a flow path defined by a conduit; a catalytic carbon fiber bundle disposed in the conduit; and an inlet allowing fluid flow into the flow path. A method may include: introducing into vessel a hydrocarbon comprising mercaptan sulfur, an aqueous caustic solution, and an oxidizer; reacting at least a portion of the mercaptan sulfur and the aqueous caustic solution to produce a mercaptide; and reacting the mercaptide and the oxidizer in the presence of a catalytic carbon fiber bundle to produce a disulfide oil.

A process for producing a catalyst including a) providing an uncalcined metal modified porous silica support wherein the modifier metal is selected from one or more of boron, magnesium, aluminium, zirconium, hafnium and titanium, wherein the modifier metal is present in mono- or dinuclear modifier metal moieties; b) optionally removing any solvent or liquid carrier from the modified silica support; c) optionally drying the modified silica support; d) treating the uncalcined metal modified silica support with a catalytic metal to effect adsorption of the catalytic metal onto the metal modified silica support; and e) calcining the impregnated silica support of step d). The invention extends to an uncalcined catalyst intermediate and a method of producing a catalyst by providing a porous silica support having isolated silanol groups.

This invention discloses a preparation method of a hydrocracking catalyst. According to the method, a new functional group is modified through chemical bonds on the surface of a traditionally prepared inorganic carrier, and a VIB group metal element and a VIIIB metal element are then loaded on the carrier to prepare the hydrocracking catalyst. The hydrocracking catalyst prepared according to the invention has a higher diesel liquid yield.