开发江西高岭土制造洗涤剂新助剂4A分子筛的研究

以江西省各地高岭土作原料,用水热合成法制备了优良的新型洗涤剂助剂4A分子筛,产品的钙交换能力达到302mgcaco_3/g绝干分子筛,相对白度97,平均粒径4.04um,同时讨论了高岭土的脱色,合成过程的控制因素,并对产物进行了表征。     

无机洗涤助剂的进展

介绍了国内外洗涤助剂的发展状况，传统洗涤助剂磷酸盐被限制，沸石类助剂有局限，层状硅酸钠以优良的洗涤性能，环保无污染的特点，成为洗涤工业的新宠。     

低硅Beta分子筛的合成研究

分两步法合成了低硅Beta分子筛,并以丙烯酸与异戊醇酯化反应作探针反应考察了低硅Beta分子筛的酸性能。结果表明：所合成的Beta分子筛具有独特的结构和酸性特征,反应温度140℃,反应时间2.5 h的条件下,丙烯酸的转化率可达76%。     

一种天然沸石矿的结构和脱氮性能的试验研究

采用产自云南文山的天然沸石矿作为试验材料,通过水洗、稀硫酸溶液浸渍和饱和氯化钠溶液浸渍三种方法活化改性处理;X衍射实验结果显示,样品中的基本成分钠红沸石保持不变;脱氮试验结果显示,饱和氯化钠溶液浸渍后的样品效果最佳,稀硫酸溶液浸渍的样品的效果次之,水洗后的样品的效果最差。     

沸石脱铝改性及其性能研究

用水热处理和水热与盐酸相结合的脱铝方法对天然沸石进行脱铝研究,考察了不同水热脱铝温度对天然沸石脱铝效果的影响,并用FT－IR、BET、EDS、SEM、XRD等实验方法对脱铝后天然沸石的结构、比表面积、表面形态、硅铝比等进行了表征和研究。结果表明,采用水热和盐酸相结合的脱铝方法具有较好的脱铝效果,在水热温度为600℃的条件下脱铝后,天然沸石能较好地满足作为催化剂或催化剂载体所需的性能。     

沸石改性制备调湿建筑材料的试验研究

研究具有天然纳米孔道结构的沸石矿物材料的调湿性能,用酸活化和热活化的改性方法调控其显微结构,对改性工艺参数进行优选,得到性能较好的沸石调湿材料.     

磷酸锰钴铝(MnCoAPO—5)分子筛的合成与表征

以三乙醇胺作模板剂,用水热法合成了MnCoAPO-5分子筛。用X射线衍射,电子探针,红外光谱等方法进行了结构研究,并测定了其晶胞参数和化学组成,同时对此分子筛的晶体形貌,热稳定性,吸附性能和比表面等进行了研究。证明锰和钴同时进入AlPO-5分子筛骨架而未改变结构类型。     

Phenol Tert-Butylation Catalyzed by Zeolite H-Mordenite

Para-tert-butyl phenol (p-TBP) and 2,4-di-tert-butyl phenol ( 2,4-DTBP) are wi.dely used for the preparation of antioxidants. Zeolite catalysts showed good performance for the synthesis of p-TBP and 2,4-DTBP. In this work, zeolite H-mordenite (HM) catalyst was prepared and the alkylation of phenol with tert-butyl alcohol over zeolite HM catalyst was investigated at different reaction conditions. It is found that increasing temperature enhances the selectivity to p-TBP and the optimum reaction temperature for phenol conversion is 438 K. Increasing flow rate decreases phenol conversion apparently while the selectivity to p-TBP has a little increase. The suitable tert-butyl alcohol/phenol molar ratio is 2. Lower alcohol/phenol molar ratios are beneficial to p-TBP while higher ones are helpful for producing 2,4-DTBP.     

Performances of lateral flow biological aerated filter in treating domestic wastewater

1 Introduction ? The biological aerated filter technique has developed rapidly since 1980s, and is widely used in municipal sewage treatment. It has been used in the primary and secondary treatment processes due to its desirable economical efficiency and …     

Dynamic confinement of SAPO-17 cages on the selectivity control of syngas conversion

The OXZEO (oxide−zeolite) bifunctional catalyst concept has enabled selective syngas conversion to a series of value-added chemicals and fuels such as light olefins, aromatics and gasoline. Herein we report for the first time a dynamic confinement of SAPO-17 cages on the selectivity control of syngas conversion observed during an induction period. Structured illumination microscopy, intelligent gravimetric analysis, UV-Raman, X-ray diffraction, thermogravimetry and gas chromatography-mass spectrometer analysis indicate that this is attributed to the evolution of carbonaceous species as the reaction proceeds, which gradually reduces the effective space inside the cage. Consequently, the diffusion of molecules is hindered and the hindering is much more prominent for larger molecules such as C₄₊. As a result, the selectivity of ethylene is enhanced whereas that of C₄₊ is suppressed. Beyond the induction period, the product selectivity levels off. For instance, ethylene selectivity levels off at 44% and propylene selectivity at 31%, as well as CO conversion at 27%. The findings here bring a new fundamental understanding that will guide further development of selective catalysts for olefin synthesis based on the OXZEO concept.