E.i. Dupont De Nemours and Company

Horacio E Bergna

David Richard Corbin

George C Sonnichsen

Loren D Brake

Konstantinos Kourtakis

Joseph J Kirkland

Ian Burn

Salvatore A Bruno

Robert L Adelman

James Adolph Robertson

This invention provides an attrition resistant catalyst composition and method for producing such composition. The catalyst is comprised of an acidic zeolite, rho or chabazite, and a particulate binder, kaolin, bentonite, alpha-alumina, or titania, which can be optionally modified by treatment with a compound containing Si, Al, P or B. This invention further provides a process for producing methylamines, preferably dimethylamine, comprising reacting methanol and/or dimethyl ether and ammonia in the presence of a catalytic amount of an attrition resistant catalyst of the invention.

Attrition resistant zeolite catalysts for production of methylamines in

An improved ceramic dielectric composition comprising a chemically homogeneous distribution of a mixture of additives on the surface of particles of ceramic powder, and to a method for enhancing the dielectric properties and sinterability of such compositions at low firing temperatures.

Ceramic dielectric composition and method for preparation

An improved ceramic dielectric composition for preparing multilayer ceramic structures for electronic devices and a method of enhancing the sinterability of such compositions at low firing temperatures by improving the distribution of zinc borate based sintering flux uniformly throughout the composition.

Ceramic dielectric compositions and method for improving sinterability

This invention relates to highly attrition resistant catalysts, catalyst precursors and catalyst supports and to processes for making and using them.

Method of making acrylonitrile

Method of making maleic anhydride

A process for producing dimethylamine is provided, comprising reacting methanol and/or dimethylether and ammonia, in amounts sufficient to provide a carbon/nitrogen (C/N) ratio from about 0.2 to about 1.5, and at a temperature from about 250.degree. C. to about 450.degree. C., in the presence of a catalytic amount of a modified acidic zeolite selected from the group consisting of chabazite, erionite, ZK-5, and rho, the zeolite having been modified by treatment with one or more compounds containing at least one element selected from the group consisting of silicon, aluminum, phosphorus, and boron, to deposit thereon at least 0.05 weight percent of the element.

Modified 8-ring zeolites as catalysts

Modified 8-ring zeolites as catalysts for conversion of methanol and

Attrition resistant catalysts, catalyst precursors and catalyst supports

There is disclosed a process for preparing superficially porous macroparticles comprising spray drying a specified well-mixed slurry of core macroparticles, colloidal inorganic microparticles and a liquid and sintering the resulting product to cause a 5%-30% decrease in surface area.

Process for preparing superficially porous supports for chromatography

Concentrated aqueous silica sols of small silica particles about 10 nm or less in diameter and uniformly sized are prepared by a process for maintaining a constant number of silica nuclei particles prior to the deposition process. The process for maintaining a constant number of silica nuclei particles in the sol consists of forming the particles at a pH 8-10.5 and a low temperature then heating the sol through a transition temperature to a deposition temperature, maintaining the pH, removing alkali metal ions and simultaneously adding alkali metal silicate from the system at a rate such that the number of silica particles in the sol remains constant while the temperature is being raised.

Silica sol process

Binder solution for preparing sand cores of initial high strength but with essentially no strength after casting metals above 700.degree. C., said binder solution comprising an aqueous solution of sodium, potassium or lithium silicate having an overall molar ratio of SiO.sub.2 /alkali metal oxide from 3.5:1 to 10:1, and containing sufficient amorphous silica so that the fraction of the total silica in the binder solution which is present as amorphous silica is from 2 to 75%, the amorphous silica having a particle size in the range from about 2 nanometers to 500 nanometers.

High ratio silicate foundry sand binders

An amorphous aluminosilicate sol with uniform size particles and a porous amorphous aluminosilicate powder composition useful as a catalyst in petroleum cracking is prepared by a process comprising (1) preparing a sol of discrete colloidal particles of uniform size within the range of from 2 to 87 nanometers, the surface of the particles consisting of a coating of an aluminosilicate at least 0.5 nanometer in thickness, by separately and simultaneously adding a sol of silica or a solution of sodium or potassium silicate and a solution of sodium or potassium aluminate to a heel sol of uniform-sized colloidal particles of aluminosilicate, silica, or one or more refractory metal oxides at a certain rate of addition and at a constant pH in the range of 9 to 12 and a temperature of 50.degree. to 100.degree. C. to deposit or coat aluminosilicate onto the surface of the heel sol particles, (2) ion exchanging the sodium or potassium ions of the sol from (1) for ammonium ions, (3) optionally removing the ammonium ions partially or completely with one or more metal ions described herein selected from Groups I to VIII of the Periodic Table, and (4) removing water from the sol without gelling so that the particles become uniformly packed into aggregates having pores of substantially uniform size and coating said powder with a surface layer 0 to 15% by weight of a metal or metal oxide, said powder having a specific surface area of 30 to 750 m.sup.2 /g, a bulk density of 0.5 g/cc or more and substantially uniform size pore diameters of from 20 A to 250 A, with pore diameters of 20 A to 45 A having a uniformity such that at least 90% of the pore volume is made up of pores of from 0.6 D to 1.4 D and pore diameters of 45 A to 250 A having a uniformity such that at least 80% of the pore volume is made up of pores of from 0.6 D to 1.4 D, where D is the median pore diameter.

Aluminosilicate sols and powders

An amorphous aluminosilicate sol with uniform size particles and a porous amorphous aluminosilicate powder are useful as catalyst in petroleum cracking. Water is removed from the sol without gelling so that the particles become uniformly packed into aggregates having pores of substantially uniform size and coating said powder with a surface layer 0 to 15% by weight of a metal or metal oxide, said powder having a specific surface area of 30 to 750 m.sup.2 /g, a bulk density of 0.5 g/cc or more and substantially uniform size pore diameters of from 20 A to 250 A, with pore diameters of 20 A to 45 A having a uniformity such that at least 90% of the pore volume is made up of pores of from 0.6D to 1.4D and pore diameters of 45 A to 250 A having a uniformity such that at least 80% of the pore volume is made up of pores of from 0.6D to 1.4D, where D is the median pore diameter.

Growing community of inventors

Wilmington, DE, United States of America

Horacio E Bergna