US Patent Issued to Chevron U.S.A. on Feb. 24 for "Method for preparing small crystal SSZ-81 zeolite" (California Inventors)

ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,558,676, issued on Feb. 24, was assigned to Chevron U.S.A. Inc. (San Ramon, Calif.).

"Method for preparing small crystal SSZ-81 zeolite" was invented by Christopher Michael Lew (Alameda, Calif.), Rebecca Edyne Maclean (Pleasanton, Calif.) and Kurt Owen Jensen (Richmond, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method is disclosed for producing small crystal forms of zeolite SSZ-81. The method includes forming a reaction mixture containing an alumina-coated silica sol, a source of an alkali metal, a structure directing agent containing 1,5-bis(N-methylpiperidinium)pentane dications and/or 1,5-bis(1-azonia-bicyclo[2.2.2]octane)pentane dicat...