The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 2018
Filed:
Nov. 06, 2014
Basf SE, Ludwigshafen, DE;
Ivor Bull, Hopewell Junction, NY (US);
Ulrich Müller, Neustadt, DE;
BASF SE, Ludwigshafen, DE;
Abstract
Zeolites having CHA framework structure and a composition comprising the molar ratio (n SiO2): X203, wherein X is a trivalent element, and wherein n is at least 10, wherein the crystal size, as determined from Scanning Electron Microscopy, is greater than 1 micrometer and wherein the chabazite framework is phase-pure having an impurity of other zeolitic frameworks, such as RUT 25 as determined by X-ray Diffraction, of less than 5%. The process for the preparation comprises: (i) preparation of an aqueous solution containing at least one source for X203 , wherein X is selected from Al, B, Ga, and a mixture of two or more, and at least one source for SiO2, at least one organic structure directing agent (SDA) other than Tetramethylammonium hydroxide (TMAOH), acting as a template for the CHA structure, and Tetramethylammonium hydroxide (TMAOH), wherein the SDA or mixtures thereof are employed in such amounts that the aqueous solution in (i) exhibits a molar ratio of SDA : TMAOH of 0.01 to 5; (ii) hydrothermal crystallization of the aqueous solution according to (i); wherein the aqueous solution of (i) contains copper in an amount less than 0.005 Cu:((n YO2)+X203) where n is in the range of 10 to 50.