支撑β分子筛膜的制备Ⅰ--工艺条件

以廉价的四乙基溴化铵为模板剂合成了支撑β分子筛膜，系统地研究了模板剂浓度、碱度、晶化时间及温度等因素对β分子筛成膜状况的影响，确定了适宜的工艺条件：n(SiO2)／n(Al2O3)=30～50，n(TEABr)／n(SiO2)=0．35～0．55，n(NaOH)／n(SiO2)=0．40～0．45，n(H2O)／n(SiO2)=8．6～10．6，温度140～150℃，时间30～60h。结果表明：以TEABr为模板剂是非常经济的。将制得的β分子筛膜与β分子筛粉末催化乙基叔丁基醚的反应活性进行了比较，发现β分子筛膜也具有良好的醚化反应性能。     

Determination of external surface composition of zeolite particles by synchrotron radiation XPS

Non-destructive depth profiling analysis with high surface sensitivity was performed by XPS with synchrotron radiation excitation. Comparison of the measured atomic ratios with the simulated ones revealed the presence of a thin Al- and Na-rich overlayer at the external surface of NaY particles. For HY zeolite particles, a gradual decrease in the Al/Si ratio from the external surface to the bulk was observed.     

In-Situ Coating of Zeolite Na-A on Al2O3-SiO2 Glass Fibers

In-situ coating of zeolite Na-A crystals on Al₂O₃-SiO₂ glass fibers was investigated by a low temperature chemical process. The glass fibers were reacted with various concentrations of NaOH solutions at 60–110°C for various times. The surface of glass fibers was first leached by the solution but crystals of zeolite Na-A precipitated on the glass fibers after a certain reaction time because the concentrations of Si and Al components in the solution increased by dissolution of the glass fibers. The precipitated zeolite was identified to be Na-A type but nosean-cancrinite-type phase and/or hydroxysodalite coexisted with zeolite Na-A at longer reaction times. With higher concentration of NaOH solution, the formation rate of zeolite Na-A was faster, the formation temperature was lower and the grain size was smaller ca. 2–3 m. Dense zeolite Na-A coatings were produced when the glass fibers were reacted in 4 M NaOH solution at 60°C for 18 h. The amount of zeolite Na-A formed on the fibers was about 20 mass%.     

饮用水沸石除氟

采用２０－４０目天然斜发沸石，经碱液等预处理后，对高氟饮用水进行离子交换吸附处理，可使含氟３－１０ｍｇ／Ｌ的饮用水降到０．５－０．８ｍｇ／Ｌ，并且水的各项指标均达到国家饮用水卫生标准，解吸剂为复合铝盐。     

Beta–type zeolites as selective and regenerable catalysts in the Meerwein–Ponndorf–Verley reduction of carbonyl compounds

Zeolite Beta, in the Al–form as well as in the Al–free, Ti–containing form, appears to be a selective and regenerable catalyst in the Meerwein–Ponndorf–Verley and Oppenauer (MPVO) reactions. In the liquid–phase MPV reduction of 4–tert–butylcyclohexanone with secondary alcohols, both catalysts display a high stereoselectivity to cis–4–tert–butylcyclohexanol, the isomer of industrial relevance. This stereoselectivity can be explained by considering the two transition states inside the pores of zeolite Beta. By using (S)–2–butanol as the reductant enantioselective reduction of phenylacetone was observed. 4–methylcyclohexanone was studied as the substrate in the gas–phase MPV reduction. Catalyst deactivation is much more pronounced with the acidic Al–Beta catalyst than with the non–acidic Ti–Beta. This revised version was published online in June 2006 with corrections to the Cover Date.     

分子筛浆料助滤技术的开发和应用

通过建立分子筛浆料过滤速率的测定方法,对四种分子筛浆料的固液分离、交换和洗涤过程的过滤速率进行了研究,开发的四种助滤剂可有效改善不同分子筛的固液分离、交换和洗涤过程的过滤速率。这四项助滤技术已在三家国内主要的裂化催化剂厂广泛的得到应用,使带式过滤机彻底取代了板框过滤机,解决了企业生产中长期存在的瓶颈问题。     

Methane transformation into aromatic hydrocarbons by activation with LPG over Zn‐ZSM‐11 zeolite

Methane (C₁) can be activated by interaction with liquefied petroleum gas (LPG) even at very high C₁ molar fractions in the feed (C₁/(C₁ + LPG)=0.85) at temperatures of 450–550°C, GHSV(LPG)=2240 and 810 ml/g h, over Zn‐ZSM‐11 (molar fraction Zn²⁺/(Zn²⁺H⁺=0.86) and total pressure of 1 atm. The isobutane (i‐C₄) of LPG could be the main responsible of this interaction. Aromatic hydrocarbons were the main products in the whole range of C₁ molar fractions (0.4–0.85) studied, reaching excellent levels of 10–45%. This revised version was published online in July 2006 with corrections to the Cover Date.     

碳化钼/β沸石的制备及其催化大豆油加氢脱羧性能

以MoO3为前驱体、改性β沸石为载体,采用程序升温还原法制备了Mo2C/β沸石催化剂,并对催化剂进行了XRD和TEM表征,考察了还原条件对催化剂性能的影响。在小型固定床反应装置上进行了大豆油加氢反应。结果表明,随着程序升温速率降低,β-Mo2C的衍射峰强度增强。随着碳化终温升高,碳化程度逐渐加深。当程序升温速率为1℃/min,碳化终温为650℃时,β-Mo2C的衍射峰最清晰。以正己烷作为碳源,Mo2C在载体上分散均匀,具有较大的比表面。采用Mo2C负载量为21.25%的Mo2C/β沸石为催化剂,在压力为3.5MPa、液时空速0.5h^-1、氢油体积比500、反应温度280、320℃的条件下,大豆油经过加氢后,凝点下降到-5～-10℃,十六烷值保持在70以上。     

湿法加碱-煅烧粉煤灰合成P沸石的研究

粉煤灰中含有一些活性较差的莫来石(M)和石英(Q)结晶体,在直接水热条件下,它们很难参与沸石晶体的合成反应,应对粉煤灰进行活化处理。通过调整粉煤灰原料的碱料比、Si/Al等参数,进行了湿法加碱-煅烧活化粉煤灰水热合成沸石的实验,实验结果证明湿法加碱-煅烧活化的效果最好,尤其是当碱料比为0.6∶1时,在实验条件下合成了结晶度和白度均在80%左右的P型沸石晶体样品。     

沸石/橡胶复合材料的制备与性能

研究斜发沸石以及分子筛代替炭黑作补强剂在橡胶中的应用.考察不同量的斜发沸石、分子筛对橡胶的补强效果,同时考察偶联剂对橡胶复合体系的影响.实验结果发现：当斜发沸石的加入份数为5份（质量分数）时,橡胶的拉伸和磨耗性能稍微下降,当加入10～20份时,性能下降很多.当5A分子筛加入5份时,橡胶的拉伸和磨耗性能下降,断裂伸长率也下降.体系的力学性能随着偶联剂用量的增加有所提高,加入1.5份时,力学性能最好.