合成条件对高岭土微球原位晶化NaY分子筛的影响  

Effect of synthesizing conditions on NaY zeolite prepared by in-situ crystallization from kaolin microspheres

作　　者：熊晓云 魏昭成[2] 王久江 高雄厚 赵红娟 胡清勋 Xiong Xiaoyun;Wei Zhaocheng;Wang Jiujiang;Gao Xionghou;Zhao Hongjuan;Hu Qingxun(Lanzhou Petrochemical Research Center,PetroChina,Lanzhou 730060,China;Catalyst Factory of PetroChina Lanzhou Petrochemical Company)

机构地区：[1]中国石油兰州化工研究中心,甘肃兰州730060 [2]中国石油兰州石化公司催化剂厂

出　　处：《无机盐工业》2020年第1期99-102,共4页Inorganic Chemicals Industry

摘　　要：以高岭土微球为原料,原位合成了NaY分子筛,并详细考察了固液质量比(简称固液比)、碱硅物质的量比(简称碱硅比)、偏高岭土微球与高温焙烧高岭土微球质量比[m(偏土球)/m(高土球)]及外加硅源对Y型分子筛结晶度的影响。研究显示,适当降低固液比和提高碱硅比,可提高Y型分子筛结晶度,但随固液比的降低和碱硅比的提高,微球晶化产物强度和Y型分子筛硅铝物质的量比(简称硅铝比)逐渐下降;采用m(偏土球)/m(高土球)为1∶4混合晶化可提高产物Y型分子筛结晶度至28%,进一步增加m(偏土球)/m(高土球),产物结晶度变化不大;采用m(偏土球)/m(高土球)为2∶3混合晶化,引入部分白炭黑作为硅源,可在固液比为0.38时,制备出强度高(磨损指数为0.9%)、Y型分子筛硅铝比为4.7、结晶度为37%的高岭土微球晶化产物。NaY zeolite was in-situ synthesized with kaolin microspheres as raw material.The effects of synthesis conditions on the crystallinity of Y zeolite were investigated in detail,such as mass ratio of solid-to-liquid,amount-of-substance ratio of alkali-to-silica,mass ratio of metakaolin to fully calcined kaolin microspheres and silicon sources.Results showed that the crystallinity of Y zeolite could be improved by properly reducing solid-to-liquid ratio and increasing alkali-to-silica ratio.But with the decrease of the solid-to-liquid ratio and the increase of the alkali-to-silica ratio,the attrition index of the products and the amount-of-substance ration of silica to alumina of Y zeolite decreased gradually.The crystallinity of Y zeolite could be increased to 28%with the mass ratio of metakaolin to fully calcined kaolin microspheres was 1∶4.However,with the further increase of the mass ratio of metakaolin to fully calcined kaolin microspheres,the crystallinity of Y zeolite changed little.Under the condition of the mass ratio of metakaolin to fully calcined kaolin microspheres of 2∶3 and solid-liquid ratio of 0.38 and using silica aerogel as partial silica source,the as-synthesized product had 37%Y crystallinity and its SiO2/Al2 O3 was 4.7.Also,the product showed good attrition index with 0.9%.

关 键 词：高岭土 Y型分子筛 原位晶化 

分 类 号：TQ424.25[化学工程]