In response to the demand for shape-controlled metal microparticles accompanying rapid development and progress in industry in recent years, metal microparticles, which have projections on the surfaces of the particles that are integrated with the particles, are provided. The metal microparticles have integrated conical projections on the surfaces of the particles, and at least some of the projections are more than ? of the size of the particles. The protrusions that protrude from the metal microparticles melt and deform at a temperature lower than the melting point of the metal itself.

Uses for a family of new crystalline molecular sieves designated SSZ-91 are disclosed. Molecular sieve SSZ-91 is structurally similar to sieves falling within the ZSM-48 family of molecular sieves, and is characterized as: (1) having a low degree of faulting, (2) a low aspect ratio that inhibits hydrocracking as compared to conventional ZSM-48 materials having an aspect ratio of greater than 8, and (3) is substantially phase pure.

A process is disclosed for opening naphthenic rings of naphthenic ring-containing compounds. Naphthene ring opening is achieved using a self-supported mixed metal sulfide catalyst comprising nickel sulfide, molybdenum sulfide, tungsten sulfide and an organic complexing agent. The catalyst is characterized as having a composition of metal components, in terms of molar ratios; as follows: 0.25Ni/(Ni+Mo+W)0.80; 0<Mo/(Ni+Mo+W)0.25; 0.12W/(Ni+Mo+W)0.50; and 1.5W/Mo3.0.

The present invention is in the field of catalysis. More particularly, the present invention is directed to supported precious metal, preferably palladium and/or gold metal catalysts, having a high degree of dispersion and a high degree of edge-coating. The present invention is further directed to a process for producing these catalysts, as well as to the use of these catalysts in chemical reactions.

The present invention provides a rare earth oxide-supported noble metal catalyst which has a high catalytic activity, is greatly improved in the ammonia production activity per weight of the catalyst and per amount of the supported metal, and enables the synthesis of ammonia under mild conditions. The catalyst according to the present invention is characterized in that ruthenium is supported in a layered form on a praseodymium oxide carrier. The catalyst according to the present invention can be produced by burning a praseodymium oxide precursor at a lower temperature, then at a medium temperature and then at a higher temperature to produce praseodymium oxide, then agitating the resultant praseodymium oxide together with a ruthenium supply source in a solvent, then removing the solvent from the mixture, and then burning the resultant product.

The present invention relates to bismuth-titanium oxide composite nanowires used for photocatalysis and a preparation method, belonging to the field of inorganic nanomaterials. The preparation of the bismuth-titanium oxide composite nanowires is: polyvinylpyrrolidone (PVP) and bismuth nitrate are added to N-N dimethylformamide (DMF), tetrabutyl titanate and acetylacetone are added after magnetic stirring has been performed for a period of time, continual stirring is performed for more than six hours, and a transparent, stable solution is obtained. Electrospinning is performed on the solution in an electrospinning generation device under certain conditions, and the obtained electrospinning precursor nano fibres are air-fired in a muffle furnace to remove organic matter. After being cooled to room temperature, the electrospinning precursor nano fibres are placed in a tube furnace to be reduced and sintered in a hydrogen atmosphere. The method is energy-saving and environmentally friendly, the conditions are easy to control, costs are low, and large-scale industrial production is easy. The obtained bismuth-titanium oxide nanowires exhibit good degradation activity on methyl orange under illumination, where the methyl orange degradation rate is reaching more than 95% in a reaction lasting for 20 minutes. The obtained bismuth-titanium oxide nanowires have wide application prospects in relation to sewage treatment.

The present invention is directed to address the following problem: in an exhaust gas purification catalyst comprising a dual catalyst of a combination of a startup catalyst and an underfloor catalyst, reduction in the gas diffusivity of the startup catalyst results in reduction in the use efficiency of a catalytic active site, resulting in reduction in purification performance. The present invention relates to an exhaust gas purification catalyst comprising a dual catalyst of a combination of a startup catalyst having a catalyst coating where a large number of voids are included and an underfloor catalyst, wherein high-aspect-ratio pores having an aspect ratio of 5 or more account for a certain rate or more of the whole volume of the voids, to thereby enhance the purification performance of the catalyst.

Process for hydrocracking and/or hydrotreatment of hydrocarbon feeds utilizing a catalyst comprising at least one hydro-dehydrogenating element of group VIB and of non-precious group VIII used alone or mixed, and a support comprising at least one porous mineral matrix and at least one dealuminated USY zeolite having an overall silicon-to-aluminium atomic ratio comprised between 2.5 and 10, a fraction by weight of extra-network aluminium atom greater than 10% relative to the total mass of the aluminium present in the zeolite, a mesopore volume measured by nitrogen porosimetry greater than 0.07 ml.g.sup.1, and a crystal parameter a.sub.0 of the elemental mesh greater than 24.28 , in which a quantity of the element nickel comprised between 0.5 and 3% by weight relative to the total mass of the zeolite is deposited on said USY zeolite and in which said catalyst is in the sulphide form.

The present invention relates to a catalyst system for oxidation of o-xylene and/or naphthalene to phthalic anhydride (PA), comprising a plurality of catalyst zones arranged in succession in the reaction tube, which has been produced using antimony trioxide consisting predominantly of the senarmontite modification of which all primary crystallites have a size of less than 200 nm. The present invention further relates to a process for gas phase oxidation, in which a gas stream comprising at least one hydrocarbon and molecular oxygen is passed through a catalyst system which comprises a plurality of catalyst zones arranged in succession in the reaction tube and which has been produced using an antimony trioxide consisting predominantly of the senarmontite modification with a median primary crystallite size of less than 200 nm.

A solid-supported palladium(II) complex which catalyzes the Mizoroki-Heck coupling reaction efficiently and a method of employing the solid-supported palladium(II) complex to synthesize cinnamic acid and derivatives thereof. The solid-supported palladium(II) complex is also stable and can be recycled without significantly losing catalytic activity.