共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
改性γ—Al2O3载体上钴和钼的分散状态 总被引:1,自引:0,他引:1
利用XRD、BET磁性分析等手段研究了在磷或钾改性的γ-Al2O3上钴和钼的存在形态,在Co-Mo/γ-Al2O3负载型催化剂中,载体γ-Al2O3的改性处理对钴和钼的分散程度有显著影响.用磷酸处理γ-Al2O3载体时,由于载体的表面形成了类似AlPO4式的结构,从而抑制了Mo-O-Al的生成,使钼以MoO3的形式存在.而在此载体上,弱碱性的钴则与磷酸在γ-Al2O3表面形成了类似磷酸钴式的结构,达到了较均匀的分散.用碳酸钾处理γ-Al2O3载体时,载体表面的强碱性抑制了钴的分散,使之形成了较大的Co3O4晶粒.相反,钼的分散度得到了提高 相似文献
3.
钨基加氢脱氮催化剂载体与活性前身物的作用 总被引:1,自引:0,他引:1
为研究载体表面化学性质和钨前物结构对钨基加氢脱氮催化剂活性的影响,以IR,XRD,程序升温硫化方法,研究了十二磷钨酸和偏钨酸铵两种不同结构的前身物在Al2O3的活性表面的分散状态。 相似文献
4.
在色谱微反流动法实验装置上考察了负载Sm2O3对CuOγAl2O3催化剂CO氧化活性的影响,并运用X射线衍射(XRD)、程序升温还原(TPR)及程序升温脱附(TPDMS)技术研究了Sm2O3对CuOγAl2O3催化剂的物相结构、氧化还原特性及表面氧的脱附与恢复行为的影响。结果表明,负载适量的Sm2O3对CuOγAl2O3催化剂表面氧的脱出与恢复有促进作用,可使部分γAl2O3相变成γAl2O3和θAl2O3的混合型。负载适量的Sm2O3能改善催化活性,而负载过量的Sm2O3则使CuO催化剂上CuO的晶粒增大,从而对催化活性起了抑制作用。 相似文献
5.
CeO_2改性的SrTiO_3陶瓷采用传统的陶瓷工艺制备。SrTiO_3基质与CeO_2按化学式SrTiO_3+x(CeO_2nTiO_2)配比[x(wt%)分别为2、5、10、15、20、25和30]。样品在1400℃下烧结1h。Ce在SrTiO_3陶瓷中起施主杂质作用。扫描电镜形貌分析和X射线物相观察表明,在此种陶瓷中有Ce_2O_3第二相即玻璃相存在,并对毒害SrTiO_3陶瓷半导体化的杂质有固溶性质;同时,Ce_2O_3第二相还具有减薄晶粒表面氧化层的作用,从而增加了晶粒电导特性。在室温下,CeO_2改性的半导体SrTiO_3陶瓷具有畸变的立方结构。 相似文献
6.
MoO3/(Tio2—SiO2)催化剂的表面分散状态及催化性能的研究 总被引:9,自引:0,他引:9
用气相流动吸附法制备复合载体,用浸渍法制备MoO3(TiO2-SiO2)催化剂,应用LRS和TPR技术研究MoO3在复合载体TiO2-SiO2表面的分散发现TiO2在SiO2表面的分散可增强MoO3与载体之间的相互作用,提高MoO3在载体表面的分散阈值。 相似文献
7.
8.
用表面张力及电动势法研究了C10H21N(CH3)3Br,C12H25N(CH3)3Br和C3F7CH2OH混合水溶液的表面与胶团性质。结果表明,对于阳离子表面活性剂,C3F7CH2OH的加入一方面增加表面活性,另一方面降低胶团反离子结合度。后者不同于阴离子表面活性剂/C3F7CH2OH混合体系,可归因于C3F7CH2OH略有酸性,因而具备一些类似阴离子表面活性剂的性质。 相似文献
9.
10.
镍盐和氧化镍在NaY沸石中存在状态研究 总被引:1,自引:0,他引:1
用XRD、EXAFS和TPR方法研究了Ni(NO3)2/NaY和NiO/NaY分散体系。在沸石上,Ni(NO3)2的分散比NiO容易得多。XRD相定量方法测定的NiO在NaY沸石上的分散阈值很低,仅为密置单层容量的2%左右。在分散阈值关NiO在沸石上处于分散相和笼外小晶粒两种状态。分散相NiO比笼外NiO小晶粒难还原。样品中NiO含量超过阈值时,笼外小晶粒长大成XRD可检测的较大晶粒。 相似文献
11.
Nonionic surfactants have broad applications such as cleaning and dispersion stabilization, which frequently are hampered by strong temperature sensitivities. As manifested by clouding and decreased solubility with increasing temperature, the interaction between water and the oligo(oxyethylene) head-groups is becoming less favorable. Different aspects of surfactant self-assembly, like the critical micelle concentration, micelle size and shape, intermicellar interactions and phase separation phenomena are reviewed as well as suggested underlying causes of the temperature dependence. Furthermore, the effect of cosolutes on clouding and the behavior of related systems, non-aqueous solutions and nonionic polymers, are examined. 相似文献
12.
Yao-Yao Fang Guang-Ming Zeng Jin-Hui Huang Jian-Xiao Liu Xiang-Min Xu Ke Xu Yun-Huan Qu 《Journal of membrane science》2008,320(1-2):514-519
Micellar-enhanced ultrafiltration (MEUF), a surfactant-based separation process, is promising in removing multivalent metal ions from aqueous solutions. The micellar-enhanced ultrafiltration of cadmium from aqueous solution was studied in systems of anionic surfactant and mixed anionic/nonionic surfactants. The micelle sizes and zeta potentials were investigated by dynamic light scattering measurements. The effects of feed surfactant concentration, cadmium concentration and the molar ratio of nonionic surfactants to sodium dodecyl sulfate (SDS) on the cadmium removal efficiency, the rejection of SDS and nonionic surfactants and the permeate flux were investigated. The rejection efficiencies of cadmium in the MEUF operation were enhanced with higher SDS concentration and moderate Cd concentration. When SDS concentration was fixed at 3 mM, the optimal ranges of the molar ratios of nonionic surfactants to SDS for the removal of cadmium were 0.4–0.7 for Brij 35 and 0.5–0.7 for Triton X-100, respectively. With the addition of nonionic surfactants, the SDS dosage and the SDS concentration in the permeate were reduced efficiently. 相似文献
13.
Irfan Ullah Musa Kaleem Baloch Gulrez Fatima Durrani 《Journal of solution chemistry》2011,40(7):1341-1348
The solubilities of two nonsteroidal anti-inflammatory (MELOXICAM and CELECOXIB) drugs, were determined in aqueous solutions
of nonionic (Tween 20, Tween 80, Brij 30, Brij 35, Triton X 100, Triton X 114) surfactants. These surfactants have different
numbers of oxyethylene units and their micelles showed different aggregation numbers. It is shown that these surfactants have
different abilities to solubilize NSAIDs drugs. The solubilities of the drugs increased linearly with the increase in concentration
of surfactants. The sizes of micelles remained constant with the addition of the drugs, except for Triton type surfactants
in which case the size of the micelles decreased. It was observed that the number of oxyethylene units in the surfactants,
aggregation number of the micelles and HLB play key roles in solubilizing the drugs. 相似文献
14.
一种修饰钙掺杂钛酸铅湿敏纳米薄膜的新方法——钾修饰薄膜的制备、湿敏特性和结构表征 总被引:3,自引:0,他引:3
为了使感湿性能很差的钛酸铅湿敏改性,选取Ti(O-n-Bu)_4,Pb(OAc)_2和Ca (OAc)_2为起始物,采用溶胶-旋涂法以及烧结晶化过程,在镀有Ag-Pd合金叉指电 极的α-Al_2O_3基片上制备了钾修饰的钙掺杂钛酸铅纳米湿敏薄膜(K~+-Ca_xPb_ (1-x)TiO_3,缩写为K-CPT)。在(20 ± 0.1) ℃常温下、相对湿度RH=8.0%~93.6 之间5个检测点上测试了K-CPT的阻-温特性,并与纯钛酸铅薄膜(PT)、钙掺杂钛 酸铅薄膜(CPT)以及锂修饰的钙掺杂钛酸铅薄膜(Li-CPT)进行了比较,对工艺进行 了正交实验和研究。结果表明:在x = 0.35,K~+含量为1%(K/Ti, mol/mol),以及 850 ℃/1h的烧结晶化成瓷条件下,所制得的陶瓷薄膜在RH=8.0%~93.6%的实测范 围内,灵敏度S=3.3*10~3,感湿响应时间τ=15s,湿滞 ≤ ±2%;而在RH=0%~ 100%的全湿范围内,总的电阻值降低值约为10~4 kΩ,即全湿范围内的灵敏度可达 四个数量级;S=10~4kΩ/100△RH(%)。通过XRD,SEM和TEM手段对薄膜的晶相结构 及显微结构进行了表征,薄膜为四方多晶,具有网状孔道和岛形晶界,晶粒呈极度 化定向排列的电畴结构,粒度为10nm,岛的平均面积为4μm*5μm。 相似文献
15.
To develop structure-property relationships for surfactants that control their adsorption, solubilization, and micellization behavior in mixed systems and to develop predictive models based on such relationships, it is necessary to acquire quantitative information on various species present in these complex systems. The analytical ultracentrifugation technique is selected for the first time to characterize the species present in mixed micellar solutions due to its powerful ability to separate particles on the basis of their size and shape. Two nonionic surfactants, n-dodecyl-beta-D-maltoside (DM) and nonyl phenol ethoxylated decyl ether (NP-10), and their 1:1 molar ratio mixture were investigated in this study. Micelles of the nonionic surfactants and their mixture are asymmetrical in shape at the critical micelle concentration (cmc). Interestingly, unlike ionic surfactants, the micellar growths of the nonionic surfactants were found to occur at concentrations immediately above the cmc. The results from both sedimentation velocity and sedimentation equilibrium experiments suggest coexistence of two types of micelles in nonyl phenol ethoxylated decyl ether solutions and in its mixture with n-dodecyl-beta-D-maltoside, while only one micellar species is present in n-dodecyl-beta-D-maltoside solutions. Type 1 micelles were primary micelles at the cmc, while type 2 micelles were elongated micelles. The differences in the micellar shapes of n-dodecyl-beta-D-maltoside and nonyl phenol ethoxylated decyl ether are attributed to packing parameters detected by their molecular structures. 相似文献
16.
Wangsakan A Chinachoti P McClements DJ 《Langmuir : the ACS journal of surfaces and colloids》2004,20(10):3913-3919
Isothermal titration calorimetry (ITC), surface tensiometry, and ultrasonic velocimetry were used to characterize surfactant-maltodextrin interactions in buffer solutions (pH 7.0, 10 mM NaCl, 20 mM Trizma base, 30.0 degrees C). Experiments were carried out using three surfactants with similar nonpolar tail groups (C12) but different charged headgroups: anionic (sodium dodecyl sulfate, SDS), cationic (dodecyl trimethylammonium bromide, DTAB), and nonionic (polyoxyethylene 23 lauryl ether, Brij35). All three surfactants bound to maltodextrin, with the binding characteristics depending on whether the surfactant headgroup was ionic or nonionic. The amounts of surfactant bound to 0.5% w/v maltodextrin (DE 5) at saturation were < 0.3 mM Brij35, approximately 1-1.6 mM SDS, and approximately 1.5 mM DTAB. ITC measurements indicated that surfactant binding to maltodextrin was exothermic. Surface tension measurements indicated that the DTAB-maltodextrin complex was more surface active than DTAB alone but that SDS- and Brij35- maltodextrin complexes were less surface active than the surfactants alone. 相似文献
17.
The correlation between the phase behavior of aqueous solutions of nonionic surfactants and the removal of oil from fabrics has been determined. Model washing experiments with pure and technical grade nonionic surfactants indicated that, in the dispersion ranges of liquid crystals, oil removal is substantially more temperature-dependent compared to micellar or surfactant liquid phases. In this phase region, interfacial tension does not seem to play a substantial role. The results are discussed in terms of the macroscopic properties of mesophases.The publications on which this report is based were promoted with funds of the Federal German Ministry of Research and Technology (No. 03 C 219 2). However, the authors alone are responsible for its contents. 相似文献
18.
《Journal of Dispersion Science and Technology》2013,34(5):593-601
Abstract This study investigated the effect of cationic, anionic (saturated and unsaturated), and nonionic surfactants on the formation, morphology, and surface properties of silica nanoparticles synthesized by the ammonium‐catalyzed hydrolysis of tetraethoxysilane in alcoholic media. Results indicate that at a relatively low surfactant concentration (1 × 10?3–1 × 10?6 M), cationic surfactants significantly affected the growth of silica particles as measured by dynamic light scattering and transmission electron microscopic analyses. In contrast, the anionic and nonionic surfactants showed relatively minor effects in the low concentration range. The magnitude of negative zeta potential was reduced for silica colloids that were synthesized in the presence of cationic surfactant because of charge neutralization. The presence of anionic surfactants only slightly increased the negative zeta potential while the nonionic surfactant showed no obvious effects. At high surfactant concentrations (>1 × 10?3 M), cationic and anionic surfactants both induced colloid aggregation, while the nonionic surfactant showed no effect on particle size. Raman spectroscopic analysis suggests that molecules of cationic surfactants adsorb on silica surfaces via head groups, aided by favorable electrostatic attraction, while molecules of anionic and nonionic surfactants adsorb via their hydrophobic tails. 相似文献
19.
Micellar structure in gemini nonionic surfactants from small-angle neutron scattering 总被引:2,自引:0,他引:2
Fitzgerald PA Davey TW Warr GG 《Langmuir : the ACS journal of surfaces and colloids》2005,21(16):7121-7128
The size and shape of micelles formed by dimeric polyoxyethylene (nonionic gemini) surfactants having the structure (Cn-2H2n-3CHCH2(OCH2CH2)mOH)2(CH2)6 with alkyl and ethoxy chain lengths ranging from n = 12-20 and m = 5-30 have been determined using small angle neutron scattering (SANS). The surfactants are polydisperse in the hydrophilic groups but otherwise analogous to the widely studied monomeric poly(oxyethylene) alkanols. We find that longer ethoxylated chains are needed to confer solubility on the gemini surfactants and that these chains in the hydrophilic corona around the alkyl core of the micelles are reasonably well described as a homogeneous random coil in a good solvent. Spherical micelles are formed by the surfactants with the longest ethoxylated chains. Shorter chains lead first to rods and ultimately a vesicle dispersion. These solutions exhibit conventional cloud point behavior, and on warming, a sphere to rod transition can be observed. For the n = 20 and m = 15 surfactant, this shape transition is accompanied by a striking increase in viscosity at low concentration and gelation at higher concentrations. 相似文献
20.
研究了1-1型钠盐对五种非 离子表面活性剂水溶液雾点的影响,有九种钠盐使雾点下降,下降的依次是IO^-3>OH^->F^->CH3COO^->BrO^-3<>Cl^->Br^_>ClO3^-≥NO^-3;有三种钠盐使雾点升高,升高的效率依次是CNS^->ClO^->I^-。 相似文献