摘要:
This invention relates to a process for producing zeolite-bound FAU structure type zeolite having excellent mechanical strength and containing reduced amounts of zeolite P and the use of the zeolite-bound FAU structure type zeolites produced by the process. The zeolite-bound FAU structure type zeolite is prepared by converting the silica of a silica-bound FAU structure type aggregate in an aqueous mixture containing an effective amount of crown ether, e.g., 15-crown-5 and 18-crown-6, to suppress the formation of zeolite P and sufficient hydroxy ions to cause the silica to be converted to the zeolite. The zeolite-bound FAU structure type zeolite finds particular application in adsorption processes and hydrocarbon conversion processes such as catalytic cracking, hydrocracking, and reforming.
摘要:
A synthetic faujasite zeolite and a process for preparing the same which includes forming a reaction mixture consisting essentially of water, a source of silica, a source of alumina, Na2O nd nucleation centers, wherein the reaction mixture has molar ratios of constituents including Na2O/SiO2, 0.4-0.9; SiO2/Al2O3, 7-13; and H2O/Na2O, 30-45, and wherein the nucleation centers have molar ratios of constituents including Na2O/SiO2, 0.5-2.0; SiO2/Al203, 10-20; and H2O/Na2O, 10-40; and heating the reaction mixture to a temperature ranging from 90 to 110° C. for a time period ranging from 23 to 29 hours to obtain the synthetic faujasite zeolite, wherein the synthetic faujasite zeolite has a crystallite size ranging from 1500 to 2000 Å, a particle size ranging from 4000 to 8000 Å, and a retention of surface of more than 70% of that of a parent zeolite, when exchanged with ammonia and subjected to hydrothermal treatment at 650° C. for 3 hours and with 100% steam.
摘要翻译:合成八面沸石及其制备方法,其包括形成基本上由水,二氧化硅源,氧化铝源,Na 2 O和成核中心组成的反应混合物,其中反应混合物具有包括Na 2 O / SiO 2 ,0.4-0.9; SiO2 / Al2O3,7-13; 和H 2 O / Na 2 O,30-45,并且其中成核中心具有包括Na 2 O / SiO 2,0.5-2.0的组成的摩尔比; SiO2 / Al2O3,10-20; 和H2O / Na2O,10-40; 并将反应混合物加热到90〜110℃的温度,时间为23〜29小时,得到合成八面沸石沸石,其中合成八面沸石沸石的微晶尺寸为1500〜2000, 颗粒尺寸范围为4000至8000,并且当与氨交换时,保留表面超过母体沸石的70%,并在650℃下进行水热处理3小时,并用100%蒸汽进行水热处理。