MCM-41介孔分子筛改性研究新进展

针对目前研制的MCM-41介孔分子筛因水热稳定性较差、孔径过小、难以用于重油加工等方面的缺陷,综述了国内外对MCM-41介孔分子筛改性研究的新进展,尤其是扩大分子筛孔径、提高水热稳定性、引入杂原子和后处理等方面的最新研究。     

介孔分子筛SBA-15的改性研究进展

从金属改性、酸改性和氧化物改性三方面综述了介孔分子筛SBA-15的改性研究进展,重点介绍了SBA-15表面功能化后引入金属改性的方法。评述了金属纳米粒子的制备对改性的SBA-15催化剂催化性能的影响。     

MCM-41介孔分子筛改性研究进展

介绍了有序介孔材料的定义和分类,MCM-41介孔分子筛、合成方法和形成机理,针对其MCM-41目前存在的一些问题,综述了国内外对MCM-41介孔分子筛最新的改性研究进展。     

铁改性HMS分子筛的制备及表征

采用溶胶-凝胶法,以十二胺为模板剂、三氯化铁为铁源,制备了铁改性HMS分子筛(Fe-HMS),利用XRD、TG-DTA、FT-IR、UV-Vis、ESR、ESEM、EDS及N2吸附-脱附测试技术对材料进行了表征.结果表明Fe-HMS材料由圴匀细小的球状纳米粒子组成,分子筛具有良好的介孔结构和热稳定性,铁已进入载体的骨架;分子筛脱模时的热分解及氧化燃烧温度显著降低,红外谱图中802 cm-1及465 cm-1吸收峰强度减弱,而紫外-可见光的吸收性能明显增强,对200～550 nm波段光的吸收达到95%.     

MCM-41介孔分子筛的合成、改性及应用研究进展

介绍了MCM-41介孔分子筛的优点,主要表现在具有较大的比表面积,孔体积与孔径和可调变等。综述了MCM-41介孔分子筛的合成方法与改性研究现状,阐述了MCM-41介孔分子筛的应用研究进展。     

介孔有机硅分子筛表面的碱改性及其催化性能

采用水热法直接合成出表面含有机碱中心的介孔有机硅分子筛PMOs催化剂.XRD分析结果表明,3种有机碱改性的催化剂都具有介孔分子筛的完整晶体结构.红外光谱IR分析结果证明了在分子筛的表面含有机碱基团.热失重（TGA）分析认为各种有机碱中心在有机介孔分子筛表面的热稳定性高于300 ℃,骨架中的乙烷基在低于500 ℃下保持稳定.甲醇与十八碳烯酸的酯化反应结果表明,十八碳烯酸的转化率随碱强度和碱中心数增加而升高,催化剂活性的顺序为PMO-DN>PMO-Py>PMO-N;3个催化剂反应后的XRD衍射强度比反应前都加强,分析认为与模板剂的脱除方法——碱化乙醇溶液有关.     

Y型分子筛介孔改性的研究进展

Y型分子筛在催化裂化领域有着极其重要的应用,对其的介孔改性研究也引起了国内外研究者的广泛关注。本文综述了近年来Y型分子筛介孔改性的方法,指出了各种方法的优缺点,重点评述了高温水蒸气脱铝过程以及使用孔导向剂脱硅过程中介孔的形成机理,分析了通过脱铝和脱硅向Y型分子筛引入介孔时对其酸性和水热稳定性产生的影响。对介孔改性后的Y型分子筛的应用进行了总结,认为介孔改性的Y型分子筛将广泛应用于煤、生物质及其他含碳原料催化转化等领域。     

MCM-41介孔分子筛的改性和应用

综述了近年来通过搀杂、有机官能化、负载的方法改性MCM-41介孔分子筛的研究情况,重点介绍了MCM-41介孔分子筛在化工、环保、生物医学领域的应用现状。     

介孔分子筛MCM-41改性及应用研究进展

纯硅介孔分子筛MCM-41具有稳定的骨架结构、孔道规则排列有序、孔径分布窄等优点,但其水热稳定性较差、酸性弱、孔径不够大,难以用于大分子反应。本文综述了近几年国内外介孔分子筛MCM-41改性及应用研究的新进展,尤其是扩孔改性、金属掺杂改性以及杂多酸改性等方面的最新研究。     

多种晶型纳米级改性碳酸钙的研制及应用

介绍了利用碳化法制备纳米级碳酸钙的最佳工艺条件，合成了链状，立方体，针状等多种晶型纳米级改性碳酸钙，并对其应用和性能进行了探讨。     

Synthesis of 2-methyl pyrazine over zinc-modified ferrierite (FER) catalysts

Microporous ferrierite (FER) zeolites with different Si/Al ratios were prepared and modified with zinc. These were used as catalysts for the cyclization of ethylene diamine and propylene glycol to yield 2-methyl pyrazine (MP) in the temperature range 300–450 °C. Influence of reaction temperature, space velocity, reactant molar ratio and time on stream on the product pattern was investigated. The major product formed was MP. All these parameters were found to have significant influence on this reaction.     

Epoxidation of styrene with TBHP/O2 over ferrierite (FER) type molecular sieves

Epoxidation of styrene over vanadium silicalite with ferrierite (FER) type topology is undertaken. Influence of temperature, pressure, various solvents and solvent to substrate mole ratio was investigated. Conversion increased with increase in temperature and pressure. Solvent to substrate mole ratio is found to play a crucial role in increasing the conversion and selectivity. Catalytic activity of V‐FER was compared with those of Ti‐FER, TS‐1 and Fe‐FER. In the case of V‐ and Ti‐ferrierite analogs, styrene oxide was the major product, whereas phenylacetaldehyde was the major product in the case of TS‐1. The catalyst could be recycled after washing by a suitable solvent such as acetone and showed no significant loss in catalytic activity. This revised version was published online in July 2006 with corrections to the Cover Date.     

正丁烯骨架异构镁碱沸石分子筛催化剂的研制与应用

采用水热合成法合成长条状大晶粒镁碱沸石分子筛,采用XRD、SEM及NH_3-TPD程序升温脱附进行表征,结果表明,实验室小试合成、中试放大及工业生产得到的3种分子筛物化指标基本一致,该分子筛催化剂在正丁烯骨架异构反应中均表现出高活性、高选择性和再生性能好等优点。工业应用结果表明,SC518催化剂在重时空速6 h~(-1)和异丁烯收率不低于30%条件下,工业装置运行中单程运行周期不小于43天,副产物收率小于1%。     

A novel method for the preparation of ferrierite zeolite

A novel method to synthesize zeolites is described. Zeolite ZSM-35 is synthesized in an extremely dense system in which there is almost no mother-liquor separated before and after the crystallization due to the addition of very small amounts of amine and water. The used amounts of amine and water are much less than 1/6 and 1/15 in the usual hydrothermal method respectively. The products are characterised by powder X-ray diffraction and TG-DTA technology.     

沸石膜的修饰及其定向生长

本文以大量文献为基础总结了沸石膜的修饰方法,其中包括结焦法、化学气相沉积法、水蒸气处理法等,并对各种修饰方法的优缺点进行了比较。此外,对沸石膜的定向生长方法也作了评述。     

Synthesis and characterization of ferrisilicate analogs of ferrierite (Fe-FER) zeolites

Ferrisilicate analogs of ferrierite (FER) type zeolite having SiO₂/Fe₂O₃ ratios ranging between 30 and 200 have been synthesized using pyrrolidine as the templating agent. On calcination, the samples develop a typical buff color indicating conversion of some tetrahedral Fe³⁺ into octahedral Fe³⁺. Correspondingly, a doublet in the Mössbauer spectrum with isomer shift at 0.15 and 0.68 mm s^-1 was observed. The Fe-FER samples were further characterized by UV-vis, IR and TG/DTA. Fe-FER samples were found to exhibit catalytic activity for n-hexane oxidation reactions with hydrogen peroxide as oxidizing agent.     

Skeletal isomerization of 1-butene over ferrierite and ZSM-5 zeolites: influence of zeolite acidity

Three ferrierite (FER) and five ZSM-5 (MFI) zeolites with SiO₂Al₂O₃ ratio ranging from 27 to 2000 are tested as catalysts for the skeletal isomerization of 1-butene at 350–450°C and atmospheric total pressure in order to study the influence of acidity and pore structure of zeolite on conversion and selectivity. The catalytic and NH₃ temperature-programmed desorption results from FER and MFI catalysts with the same SiO₂/Al₂O₃ ratio reveal that the pore structure of FER zeolite rather than its acidity may play an important role in achieving high selectivity for the skeletal isomerization of 1-butene to isobutene.     

Y分子筛的改性及在加氢脱氮反应中的催化性能

采用水热法与草酸脱铝相结合法对Y分子筛进行改性,用孔体积饱和浸渍法制备了Ni-W/γ-Al2O3-USY加氢精制催化剂,考察了改性Y分子筛对催化剂的酸性及催化剂的HDN活性的影响,并对制备的催化剂进行了酸性表征。随着草酸加入量的增多,催化剂的总酸量减少;随着处理温度的增高,弱酸和强酸量分别有不同程度的增多。催化剂中适量的USY可以明显提高催化剂的总酸量,并提供对喹啉HDN的适中酸强度,明显提高催化剂的HDN活性。     

The skeletal isomerization of C4-C7 1-olefins over ferrierite and ZSM-5 zeolite catalysts

The skeletal isomerization of C₄-C₇ 1-olefins was studied on ferrierite (FER) and ZSM-5 (MFI) zeolites to elucidate the effect of the molecular distribution in zeolite pores on the selectivity foriso-olefin formation. Regardless of the difference in molecular length of 1-olefins, the FER zeolite showed high selectivity foriso-olefins, while the selectivity became slightly low at the skeletal isomerization of long olefin molecules. The drastic decrease in the selectivity of MFI zeolites by increasing the conversion is concurrently observed in the skeletal isomerization of C₄-C₇ 1-olefins. The high selectivity of FER zeolites is explained by their sparse distributions of olefin molecules in pores, which induces a high preference for monomolecular skeletal isomerization.