ZSM-5 zeolite was rapidly synthesized in system containing ethylenediamine from the initial gel: (5?8) Na2O: 44 EDA:Al2O3:100 SiO2:4000 H2O. The crystals were lath-shaped. The effect of pretreatment and alkalinity on...ZSM-5 zeolite was rapidly synthesized in system containing ethylenediamine from the initial gel: (5?8) Na2O: 44 EDA:Al2O3:100 SiO2:4000 H2O. The crystals were lath-shaped. The effect of pretreatment and alkalinity on crystallinity was investigated. The pretreatment of silicate source can cut down the crystallization time. Tuning the system alkalinity and controlling crystallization time can ensure forming of pure crystal.展开更多
Ⅰ. INTRODUCTIONPhysical treatment of the HZSM-5 catalyst with steam or coking or modification with metal salts produces high para-selectivity catalyst for alkylation or disproportionation of toluene and isomerization...Ⅰ. INTRODUCTIONPhysical treatment of the HZSM-5 catalyst with steam or coking or modification with metal salts produces high para-selectivity catalyst for alkylation or disproportionation of toluene and isomerization of xylene. However, as the para-selectivity increases, the activity always decreases, and vice versa. In this work the effect of展开更多
利用沸石-活性炭组合填料生物滤池对黄河兰州段微污染原水预处理效果进行了试验研究。采用上向流方式,原水经沸石-活性炭组合填料生物滤池,通过自然挂膜的方法,使生物膜附着生长在填料表面,经比较试验,在不同水力停留时间下,检测污染物...利用沸石-活性炭组合填料生物滤池对黄河兰州段微污染原水预处理效果进行了试验研究。采用上向流方式,原水经沸石-活性炭组合填料生物滤池,通过自然挂膜的方法,使生物膜附着生长在填料表面,经比较试验,在不同水力停留时间下,检测污染物的去除效果。进而在气水比、水力停留时间一定的条件下,观察其耐冲击负荷能力,并对沸石-活性炭组合填料滤池与沸石生物滤池和活性炭生物滤池的除污效果进行比较。结果表明：水力停留时间为40 m in,气水比为1∶1,水温在25-30℃的试验条件下,组合填料生物滤池对NH3-N,CODcr,UV254,浊度和锰的平均去除率分别为94.77%,39.92%,10.17%,70.10%,91.30%。因此,沸石-活性炭组合填料生物滤池相对于沸石生物滤池而言,其对微污染原水的预处理效果较明显,且具有较强的耐冲击负荷能力。展开更多
基金Project (No. 29976036) supported by the National Natural Science Foundation of China
文摘ZSM-5 zeolite was rapidly synthesized in system containing ethylenediamine from the initial gel: (5?8) Na2O: 44 EDA:Al2O3:100 SiO2:4000 H2O. The crystals were lath-shaped. The effect of pretreatment and alkalinity on crystallinity was investigated. The pretreatment of silicate source can cut down the crystallization time. Tuning the system alkalinity and controlling crystallization time can ensure forming of pure crystal.
文摘Ⅰ. INTRODUCTIONPhysical treatment of the HZSM-5 catalyst with steam or coking or modification with metal salts produces high para-selectivity catalyst for alkylation or disproportionation of toluene and isomerization of xylene. However, as the para-selectivity increases, the activity always decreases, and vice versa. In this work the effect of
文摘利用沸石-活性炭组合填料生物滤池对黄河兰州段微污染原水预处理效果进行了试验研究。采用上向流方式,原水经沸石-活性炭组合填料生物滤池,通过自然挂膜的方法,使生物膜附着生长在填料表面,经比较试验,在不同水力停留时间下,检测污染物的去除效果。进而在气水比、水力停留时间一定的条件下,观察其耐冲击负荷能力,并对沸石-活性炭组合填料滤池与沸石生物滤池和活性炭生物滤池的除污效果进行比较。结果表明：水力停留时间为40 m in,气水比为1∶1,水温在25-30℃的试验条件下,组合填料生物滤池对NH3-N,CODcr,UV254,浊度和锰的平均去除率分别为94.77%,39.92%,10.17%,70.10%,91.30%。因此,沸石-活性炭组合填料生物滤池相对于沸石生物滤池而言,其对微污染原水的预处理效果较明显,且具有较强的耐冲击负荷能力。
