共查询到19条相似文献,搜索用时 562 毫秒
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表面活性剂改性的铝交联粘土的表征及其水蒸汽减活动力学研究 总被引:3,自引:0,他引:3
以聚乙烯醇(PVA)为支撑前体合成出改性的铝交联蒙脱土与铝交联累托土。采用XRD、N2低温吸附脱附法、IR等手段对它们进行了表征,并研究了它们在不同时间与温度条件下的水蒸汽减活动力学。研究结果表明,PVA的改性有助于铝交联粘土层间距与比表面积的增大及热稳定性与水热稳定性的提高,粘土基质对其热稳定性与水热稳定性有显著影响,该类催化材料的水蒸汽减活动力学遵循一级衰减反应方程式,其减活速率常数与温度的函数关系可用一个指数函数的经验式表示。 相似文献
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介孔固体超强酸催化剂的制备与结构表征 总被引:15,自引:1,他引:14
以累托土为基质,采用硅锆双组分交联剂和SO42-改性的方法,研制交联粘土介孔固体超强酸(SO42-/SiZrR),借助XRD, BET法,FT-IR, Hammett指示剂法,NH3-TPD, Py-IR和DTA等现代分析测试方法,表征其结构.实验结果表明:500℃焙烧后,SO42-/SiZrR的Hammett酸度函数Ho<-11.93,最可几孔径分布在2.3 nm左右,具有超强酸性和介孔结构;其超强酸中心属于L酸中心,是主要的催化活性中心;硅锆双组分交联柱能使交联粘土的热稳定性提高,以累托土为基质的交联粘土比以蒙脱土为基质的交联粘土热稳定性高. 相似文献
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用水热法合成出铁皂石和铁镍皂石,用羟基铝作交联剂制备了交联粘土.经XRD、DTA、IR、TPR、Mssbauer谱和化学分析表征,证明铁进入了粘土层骨架,铝交联可能作用在四面体铁上.形成Al_p-O-Fe键. 相似文献
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“层柱”粘土分子筛稳定性的研究 总被引:3,自引:0,他引:3
用差热分析及测定高温水蒸汽减活处理后轻柴油微反裂化活性的方法,表征了交联蒙皂石类“层柱“粘土分子筛的热稳定性及水热稳定性,证明它远远低于REY型分子筛裂化催化剂,甚至低于无定形硅铝催化剂。用X射线衍射方法分析了它的热破坏过程,说明破坏首先是从“层”和“柱”的接头开始,层间域消失,催化活性也相应丧失;继而才是蒙皂石的2:1层破坏。为改进稳定性必须使“层”、“柱”之间的原子形成稳定的配位键。在此础基上,研制成功一种高稳定性的“层柱”粘土分子筛。此样品经800℃常压100%水蒸汽处理17小时后,层间距基本不变,微反活性保留初活性的90%,同样条件下REY型分子筛只保留初活性的52%。新型“层柱”粘土分子筛的水热稳定性超过REY分子筛裂化催化剂。 相似文献
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采用不同的脱铝方法得到Si/Al比为15~112的丝光沸石,用IR方法测定了样品的脱铝空穴含量,并考察样品的热稳定性和疏水性,实验结果表明,脱铝后形成的大量末端硅羟基仍有亲水性,因而单纯酸脱铝疏水化效果有限,用水蒸汽处理或(NH4)2SiF6补硅的方法使沸石表面硅羟基转变成≡Si-O-Si≡键,能显著地提高沸石疏水性。 相似文献
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高硅分子筛MCM-41热稳定性与水热稳定性的初步研究董维阳,龙英才,郜晓琴,许太明,谢关根,高滋(复旦大学化学系,上海,200433)关键词高硅分子筛MCM-41,热稳定性,水热稳定性,环己烷吸附等温线MCM-41是最近几年刚刚发现的中孔分子筛(M4... 相似文献
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Wu P Wu H Li R 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2005,61(13-14):3020-3025
The montmorillonite samples from Heping, China had been studied by chemical analysis, DAT, TG, XRD and MAS NMR. The results showed that the hydroxyl in octahedra sheets begins dehydrating, when the thermal treatment temperature reaches 650 degrees C, but the layer structure remains, the corresponding Al(VI) was turned into Al(IV) in octahedra sheets. When the temperature reaches 900 degrees C, the layer structure of montmorillonite is destroyed, and the new mineral phase mu-cordierite is found. When the temperature reaches 1200 degrees C, the mu-cordierite phase loses stability, and decomposes into cristobalite phase and mullite phase, meanwhile, the recrystallization phenomena in thermal treatment products is obvious. There is a small quantity of Al(VI) signal in MAS NMR spectrum, this Al(VI) corresponds to the Al of mullite. When the temperature reaches 1350 degrees C, the cristobalite and mullite phases reduce slightly, and more Fe-cordierite phase appear. There is corresponding Fe-cordierite spectrum in XRD and MAS NMR. 相似文献
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交联蒙脱土负载型Cu催化剂用于CH4燃烧反应的研究 总被引:2,自引:0,他引:2
在蒙脱土原粉中引入Al-、AlZr-、AlCe-交联剂,分别制备交联蒙脱土。测试表明:与蒙脱土原粉相比,Al-、AlZr-、AlCe-交联蒙脱土的底面间距明显增大,热稳定性显著提高;AlZr-、AlCe-交联蒙脱土的底面间距比Al-交联蒙脱土更大,热稳定性更高。以交联蒙脱土为载体,制得负载型Cu催化剂,考察了它们对甲烷燃烧反应的催化活性。结果表明:AlZr-、AlCe-交联蒙脱土催化剂活性明显高于Al-交联蒙脱土催化剂,反应温度为550 ℃时,甲烷在AlZr-、AlCe-交联蒙脱土催化剂上的转化率约90%。 相似文献
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层柱人工水热合成皂石的制备与表征(英) 总被引:5,自引:0,他引:5
利用具有理想皂石结构的人工水热合成蒙皂石为层原料,通过与羟基聚合铝离子([Al13O4(OH)24(H2O)12]7+)交换反应合成得到了一种层柱粘土。实验对于该铝柱皂石进行了粉末XRD,FT-IR和TG-DTA表征。氮气吸附实验说明其高温活化(773K,2 h)产物具有很高的BET比表面(360 m2·g-1)。相对于层柱蒙脱土,层柱皂石显示了更高的催化裂解性能和热稳定性。层柱皂石的异丙苯裂解转化率达到了65%;而层柱蒙脱土的转化率只有4%。这说明层材料的四面体取代对于层柱粘土Br?nsted酸位的形成具有重要的决定作用。氨程序升温脱附实验发现铝柱皂石在350~650 ℃区间具有较强的氨脱附量,表明层柱皂石具有层柱蒙脱土所没有的强酸中心。 相似文献
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Lingya Ma Qing Zhou Tian Li Qi Tao Jianxi Zhu Peng Yuan Runliang Zhu Hongping He 《Journal of Thermal Analysis and Calorimetry》2014,115(1):219-225
For combining the properties of organoclays and pillared clays, inorganic–organic clays have attracted much attention in recent years. In this study, Al Keggin cation pillared montmorillonites (Al-Mts) were first prepared and parts of Al-Mts were calcined at different temperatures (C-Al-Mts). The inorganic–organic montmorillonites were synthesized by intercalating Al-Mts and C-Al-Mts with the cationic surfactant, hexadecyltrimethyl ammonium bromide (HDTMAB). The products were characterized by X-ray diffraction, X-ray fluorescence, and simultaneous thermogravimetric analysis. For HDTMAB-modified uncalcined Al Keggin cation pillared montmorillonites (H-Al-Mts), the basal spacing increased with the increment of surfactant loading level, but the Al content of H-Al-Mts decreased simultaneously, indicating that the intercalated surfactant replaced some Al Keggin cations in the interlayer space. However, in the case of C-Al-Mts, the interlayer spaces could not be further expanded after surfactant modification, implying that the neighboring montmorillonite layers were “locked” by the aluminum pillars which were formed by dehydroxylation of Al Keggin cation pillars during thermal treatment. The thermal stability of HDTMAB-modified C-Al-Mts (H-C-Al-Mts) was much better than that of H-Al-Mts. The major mass loss of H-C-Al-Mts occurred at ca. 410 °C, corresponding to decomposition of intercalated surfactant cations. In contrast, H-Al-Mts displayed two mass loss temperatures at ca. 270 and 410 °C, corresponding to the evaporation of surfactant molecules and the decomposition of surfactant cations in the interlayer space, respectively. 相似文献
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I. Pálinkó I. Kiricsi Gy. Tasi K. Varga 《Journal of Thermal Analysis and Calorimetry》1993,39(2):197-205
Natural montmorillonite was pillared by various polyhydroxy cations. The resulting pillared layer clays (PILCs) were characterized by X-ray fluorescence, X-ray diffraction (XRD) and infrared (IR) spectroscopies. The thermal behaviour of Al-PILC was investigated in detail by a combonation of XRD, derivatography IR spectroscopy and a comparison to natural montmorillonite is given. It was found that thermal stability of Al-PILC is lower than that of natural montmorillonite. However, heat treatment in the stability region results in significant sintering of natural montmorillonite, while the interlayer spacing of Al-PILC is hardly affected. 相似文献
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Benito I. Blanco C. Martínez M. del Riego A. González F. Pesquera C. 《Journal of Thermal Analysis and Calorimetry》1999,55(2):461-466
Thermogravimetric analysis of pyridine adsorption was applied to study the acidity at different temperatures of clays pillared
with Al pillars and mixed Al-Ga pillars, in relation to the starting montmorillonite. These results were compared with those
obtained by means of a pulse-chromatographic technique. The pillaring process produces a large number of acid centers in the
samples. Al-Ga-PILC has a higher acidity than Al-PILC.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献