共查询到20条相似文献,搜索用时 72 毫秒
1.
采用一种沉淀/混合沉淀的方法, 制得了具有类似于分子筛结构的结晶型二元氧化物 Zr O2 Si O2. 用1 m ol/dm 3 的硫酸处理该氧化物并在550 ℃焙烧, 制得了具有类似于分子筛结构的结晶态超强酸催化剂 S O42- / Zr O2 Si O2. 采用 X R D、 I R、 T G、 S E M 等对催化剂的结构进行了表征, 发现该催化剂的 X R D谱图与 Z S M5 分子筛的 X R D谱图非常类似. 用指示剂法证实了催化剂的超强酸性. 还考察了催化剂对于乙酸/丁醇酯化反应的催化活性. 相似文献
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纳米晶钛镧酸盐的水热合成和表征 总被引:7,自引:6,他引:7
报道了在TiO2-La2O3-M2O-H2O水热体系中,新型钛镧酸盐M0.5La0.5TiO3(M=La,Ag0.66Na0.33,Li0.6Na0.4)的水热合成,用XRD、SEM、TEM、ICP、DTA-TG、IR和ac阻抗分析技术进行了结构表征。讨论了水热合成反应体系pH、反应混合物的组成比以及晶化温度等因素对合成的影响。XRD分析表明,Na0.5La0.5TiO3和Ag0.33Na0.17 相似文献
3.
稀土溴化物与甘氨酸配合物标准摩尔生成焓的测定 总被引:2,自引:0,他引:2
采用量热法在29815±010K测量了REBr3·3Gly·3H2O(RE=La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Y;Gly为甘氨酸)和甘氨酸在水中的积分溶解热,及REBr3·nH2O(RE=La、Ce、Pr时,n=7;RE=Nd、Sm、Eu、Gd、Tb、Dy、Y时,n=6)在甘氨酸水溶液中的积分溶解热。用本研究设计的热化学循环求得上述10种REBr3·3Gly·3H2O配合物的标准摩尔生成焓,并计算出它们的晶格能。 相似文献
4.
对甲烷氧化偶联W—Mn/SiO2催化剂Na2WO4的流失及其影响的考察 总被引:1,自引:0,他引:1
用XRD,FT-IR,ESR,H2-TPR和TOP等方法,对Na2WO4Mn2O3/SiO2催化剂和其经水煮处理的一系列样品进行一表征。实验发现该催化剂中的结晶态NaWO4易于流失,单层分布的Na2WO4在苛刻的处理条件下也有可能流失。 相似文献
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纳米尖晶石型Co2MnO4的形成过程及其F-T反应性能 总被引:2,自引:0,他引:2
用溶胶凝胶法制备了尖晶石型Co2MnO4超细粒子,用DTATG,XRD,TEM,FTIR等手段研究了Co2MnO4超细粒子的形成过程,进而用反应评价结合XRD,XPS,BET比表面积测试研究了Co2MnO4催化剂的比表面积和表面结构与其FT反应性能间的关系.结果表明,Co2MnO4超细粒子可以在较低温度(250~350℃)下形成,并具有粒度小,分布均匀等特点.用该法制备的超细粒子Co2MnO4,其催化活性明显优于相同组成的大颗粒催化剂. 相似文献
7.
Ce2O—TiO2/SiO2的制备及除氟性能研究 总被引:5,自引:0,他引:5
以SiO2为基质,CeO2TiO2为包覆物质,采用溶胶凝胶法制备CeO2TiO2/SiO2表面复合物,并对所制复合物进行除氟测试。用扫描电镜(SEM)观察表面形貌,讨论实验环境、试剂用量等因素对CeO2TiO2/SiO2制备及除氟性能的影响,结果表明:nTi(OC4H9)4/nCeCl3·7H2O=1、nCH3COOH/nTi(OC4H9)4=45、nC3H8O3/nTi(O4H9)4=03、RH=95%,热处理温度110℃时,所制CeO2TiO2/SiO2对F-的吸附容量(q)为214mg/g,去除率(E)为856%。 相似文献
8.
超细纳米TiO2/Al2O3复合体的制备及其组成分布的研究 总被引:3,自引:0,他引:3
采用溶胶-凝胶法成功制备出纳米尺寸的TiO2/Al2O3复合体,并用XRD、XPS和IR等手段研究了复合体的结构组成及TiO2和Al2O2的分布状态,进一步探讨了机械研磨法制备TiO2/Al2O3复合体等因素对其组成的影响。XRD分析表明,在〔Al^+3〕:〔Ti^+3〕=1:1(或0.5)情况下,改进的溶胶-凝胶法制备纳米TiO2/Al2O3复合体,其TiO2主要分布在Al2O3的表面层,在含T 相似文献
9.
Ti/SnO2+Sb2O3/PbO2阳极的性能研究 总被引:13,自引:0,他引:13
以SEM、EDS和XRD研究Ti/SnO2+Sb2O3/PbO2阳极,测定该阳极在1mol/LH2SO4中的使用寿命及其电化学参数a,b,i0并用双位垒模型讨论了其动力学参数。结果表明该电极具有优良的电化学性能和较长的使用寿命。 相似文献
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An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions. 相似文献
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An efficient tandem approach for the selective synthesis of 4,5-dihydroimidazo[1,5-a]quinoxalines 6a–g and imidazo[1,5-a]quinoxalines 7a–h by the reaction of 2-imidazolyl anilines 4a–c with aryl aldehydes 5a–k under mild reaction conditions is described. Introduction of electron releasing alkyl groups in substrates 4a–b was found to be instrumental for the success of the reaction. 相似文献
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The Diels-Alder reactivity of 1,2-heteroborines (H4C4B(H)X, X?=?NH, PH, AsH; O, S, Se) has been computationally explored by means of Density Functional Theory (DFT) calculations. The influence of the HB?=?X fragment on the reactivity of the system has been quantitatively analyzed in detail by means of the so-called Activation Strain Model (ASM) of reactivity. It is found that the interaction between these species and the dienophile is significantly stronger than that computed for their all-carbon isoelectronic counterpart, benzene. In addition, the strain energy plays a key role in the observed reactivity trends. The role of the aromaticity strength of these heteroarenes on the reactivity is also assessed. 相似文献
14.
Xi-Liu YunWen-Ying Bi Jian-Hui HuangYu Liu Daisy Zhang-NegrerieYun-Fei Du Kang Zhao 《Tetrahedron letters》2012,53(38):5076-5080
A variety of N-aryl and N-alkyl carbazolones were conveniently achieved in good to high yields via Pd2(dba)3-mediated intramolecular coupling of N-substituted α-iodo enaminones under microwave irradiation. The Pd(0)-catalyzed cyclization was found to proceed favorably with the more electron-deficient phenyl ring during the reactions involving unsymmetrical N,N-diaryl α-iodo enaminones. This unique property enables the construction of carbazolone skeleton containing nitro substituted benzenoid ring. 相似文献
15.
Both substituted 2,4,5,6-tetrahydrocyclopenta[c]pyrazoles and 2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles have been synthesized by the 3+2 intramolecular dipolar cycloaddition of nitrilimines to alkynes. This cyclization has been extended to more versatile 3-bromo derivatives by the use of alkynylbromides as dipolarophiles. 相似文献
16.
An efficient and benign method for the preparation of aminomethyl-substituted fullerenes has been developed. The process, involving catalyst free, visible-light irradiation of 10% EtOH-toluene solutions containing fullerene C60 and N-trimethylsilylmethyl-substituted amines by using a 20 W compact fluorescent lamp, leads to formation of aminomethyl-substituted fullerene adducts in a highly efficient manner. The photoaddition reaction takes place via a pathway initiated by visible light absorption by C60, followed by SET from the amine to the triplet excited state of C60. Ethanol-promoted desilylation of the resulting a minimum radical then generates the corresponding α-amino radical which couples with the C60 radical anion to form the anion precursor of the fullerene adducts. The new approach using visible-light takes place under mild conditions and it does not require the use of photocatalysts. Thus, the method developed in this effort could broadens the range of functionalized fullerene derivatives that can be readily prepared. 相似文献
17.
Viktor A. Dmitriev Mariia M. Efremova Alexander S. Novikov Vladimir V. Zarubaev Alexander V. Slita Anastasia V. Galochkina Galina L. Starova Andrey V. Ivanov Alexander P. Molchanov 《Tetrahedron letters》2018,59(24):2327-2331
The reactions of various nitrones with indolyl- and pyrrolylacrylates proceeds regioselectively with high diastereoselectivity in the case of aldonitrones, and represents an effective method for obtaining new indolyl- and pyrrolyl-substituted isoxazolidine carboxylates stabilized by weak (CH?O) and moderate (NH?N) strength intramolecular hydrogen bonding. The resulting cycloadducts exhibit promising in vitro anti-influenza activities. 相似文献
18.
A transition metal-free method for the direct amination of benzoxazoles using formamides as nitrogen sources is reported, which was mediated by an inexpensive and environmentally friendly tetrabutylammonium iodide/tert-butyl hydroperoxide system and gave the 2-aminobenzoxazole derivatives with moderate to good yields. 相似文献
19.
Multifunctionalized 1,2,3,4-tetrahydropyridines are concisely synthesized in good yields via l-proline-catalyzed or l-proline/FeCl3-cocatalyzed one-pot multicomponent reactions (MCRs). The MCRs involve a domino hydroamination/prins reaction/Mannich-type reaction/intramolecular dehydration-cyclization process. The molecular structure of 5baa, one of multifunctionalized 1,2,3,4-tetrahydropyridines, was confirmed by single-crystal X-ray diffraction. 相似文献
20.
Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction
Laurent Gavara Thomas Boisse Jean-Pierre Hénichart Adam Daïch Philippe Gautret 《Tetrahedron》2010,66(38):7544-5571
In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments. 相似文献