【摘 要】
：
Three series of dealuminated Y zeolites have been prepared by chemical extraction ofhydrothermally dealuminated Y zeolite(USY)with H_2Na_2EDTA,HCl and H_4EDTA.
【出 处】
：
Chinese Journal of Chemistry
论文部分内容阅读
Three series of dealuminated Y zeolites have been prepared by chemical extraction ofhydrothermally dealuminated Y zeolite(USY)with H_2Na_2EDTA,HCl and H_4EDTA.The unitcell constant,mesopore distribution,acidity and extraframework aluminum(EFAL)of thezeolites were studied with XRD,chemical analyses,adsorption,IR and NH_3-TPD techniques.It was shown that H_2Na_2EDTA only removed EFAL species deposited in the pores of USY,by contrast,HCl and H_4EDTA extract both extraframework and framework aluminum,andmake the zeolite framework further dealuminated.Adsorption tests gave evidence that a second-ary pore system exists in these dealuminated zeolites.H_2Na_2EDTA extraction increased bothmicropore and mesopore volumes,but after HCl and H_4EDTA treatments,new mesopores formedand the micropore volume was decreased.The pyridine-IR and NH_3-TPD measurements demon-strated that EFAL had no evident contribution to the zeolite acidity.
其他文献
2003年11月19日财税[2003]231号各省、自治区、直辖市、计划单列市财政厅(局)、国家税务局、地方税务局: 为进一步支持“非典”防治工作和缓解“非典”对经济的影响,经国务院
A method is presented for the computer-assisted optimization of mobile phaseselection for the separation of a synthetic intermediate of unknown composition by
目的:建立木香顺气丸(陈皮、厚朴、苍术等)甲醇提取物特征图谱的HPLC特征图谱分析条件,为木香顺气丸的内在质量评价积累数据,为优化及评价中药复方特征图谱提供一种方法。方
本品是新型高效植物生长调节剂。经过国内外专家进行反复研究多次实验,采用进口特殊渗透剂(Nonipo120)、扩散剂(Aaogen477)、增效剂(Tegoamincpe)生产,增产效果明显,正象农
目的:探讨益气温阳化瘀法之肾消方对糖尿病肾病大鼠肾脏蛋白激酶C活性的影响。方法:单肾切除加链脲佐菌素(STZ)腹腔注射制作糖尿病肾病动物模型。分别予以中药肾消方和厄贝沙
计算了锌二元系：Ｆｅ－Ｚｎ，Ｐｈ－Ｚｎ，Ｃｕ－Ｚｎ，Ａｌ－Ｚｎ，Ｃｕ－Ｚｎ的气－液成份并绘制气－液成份图，为锌二元系合金分离提供了理论数据．
The gas-liquid composition of Fe-Zn, Ph-Zn, Cu-Zn, Al-Zn and Cu-Zn was calculated and
农村集体资产因分布广、分散面积大,表面上单件数额较小。但全国近3000个县,几十万个乡村,集体资产汇总起来数额惊人。其流失的数额也不在少数。那么,这些资产是通过什么方
目的了解吉林省孕产妇的行为特征及艾滋病感染危险因素流行情况。方法根据《全国艾滋病哨点监测实施方案操作手册》的要求,在每年4-6月份开展孕产妇监测,对监测对象进行问卷
全省地税系统在认真贯彻省委、省政府提出的“树立科学发展观,建设美好新江西”主题教育活动基础上,开展了“三个服务”学教活动,宗旨是让地税机关和地税工作人员,在工作中
传统出版业在完成了从“铅与火”到“光与电”的革命后,再次迎来了新浪潮——数字化。数字出版依托传统出版行业基础、结合现代高新IT技术优势、倚靠国家的大力支持,在业内企