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1.
一氧化碳高效吸附剂CuCl/分子筛   总被引:17,自引:2,他引:15  
利用自发单层分散原理,将CuCl分散在载体表面制备高效的CO吸附剂,将CuCl与γ-Al2O3,4A,13X,NaY,CuY分子筛等高比表在载体混合,在350℃焙烧数小时,XRD和EXAFS研究证明CuCl可在载体表面达到原子水平的分散由于Cu^+可与CO生成配位键。由此可制得对CO有高吸附容量和选择性的吸附剂,其中CuCl/NaY和CuCl/Cu^+Y吸附剂的吸附容量在20℃,CO分压为60kP  相似文献   

2.
NiO在NaY分子筛上的分散研究   总被引:3,自引:0,他引:3  
用XRD和IR对NiO在NaY分子筛上的分散进行了研究,结果表明,采用多次浸渍能提高NiO的分散量,而焙烧温度的改变对此没有明显的影响,得到NiO的最大分散量为25%,同时发现,NiO分散相与NaY之间存在着较强的相互作用,使分子筛的热稳定性降低;随着NiO分散量的增大,NaY结构遭到破坏程度加大,对NiO在NaY表面存在的状态提出了选择分布的模型。  相似文献   

3.
试验几种无机氯化物对镍-4-[(5-氯-2-吡啶)偶氮]-1,3-二氨基苯(Ni-5-Cl-PADAB)显色反应的影响,无机盐对该显色体系有较强的增敏作用,且依NaCl>KCl~LiCl>MgCl2的顺序减弱;此外无机盐还能提高该显色反应的选择性及稳定性。从引入无机氯化物前后显色剂及配合物吸收光谱的变化,PKa3及配合物稳定常数的改变等方面探讨了无机氯化物对显色反应增敏作用的机理,并将Ni-5-C  相似文献   

4.
Na+对Li/改性石墨电池循环性能的影响研究   总被引:1,自引:0,他引:1  
分别用普通4A和锂化4A分子筛两种方法去除锂离子电池非水电解质体系(EC/DEC/LiClO4)中的微量水,引进不同浓度的Na^+离子。用原子吸收光谱法测定两种情况下体系中的Na^+及Li^+浓度;然后于室温下恒电流充放电,测定利用上述两种除水方法所得电解液配制的Li/石墨电池的循环性能。结果表明,小电流下充放电,高Na^+浓度能对锂离子电池循环性能构成严重破坏;随着电流的增大,电池对Na^+的敏  相似文献   

5.
牛国兴  张伟  李全芝 《催化学报》1995,16(3):190-195
应用XRD,XPS,IR-TPD,CO2和NO吸附及正庚烷裂解和噻吩加氢脱硫脉冲微反等方法,研究了加氢处理催化剂载体经Y型分子筛改性前后各种性质的变化,结果表明,载体经Y型分子筛改性后,催化剂的B酸、正庚烷裂解活性和异构选择性明显提高,Y型分子筛以分散的形式分布于γ-Al2O3表面,减少了载体表面的空位铝,该催化剂中有盯当一部分金属组分进入Y型分子筛孔道与3其B酸位作用,与NiQ/γAl2O3相比  相似文献   

6.
超微NaY分子筛的合成(Ⅰ)--添加轻稀土离子的影响   总被引:11,自引:0,他引:11  
导向剂的陈化时间和反应胶的晶化温度可以影响NaY分子筛的晶化行为。随导向剂陈化时间的增加,NaY分子筛的晶化速度加快晶粒尺寸减少;随晶化温度的升高,NaY分子筛的晶化速度加快,但晶粒尺寸增加。而向合成体系中添加轻稀土离子(Ln^3+)对NaY分子筛的晶化行为影响更为明显。与未添加稀土离子时相比较,在一定的稀土离子添加量范围内〔n(Ln^3+)/n(Al^3+)〈0.2〕,NaY分子筛的晶化速度明显  相似文献   

7.
采用单层分散法将Ru3(CO)12引入NaY分子筛的孔道中,借助FTIR,EXAFS和UV-VIS等实验手段对其进行了测定,发现Ru3(CO)12完整地分布于分子筛的超笼内,抽空会导致在保持金属骨架情况下的部分脱羰,同时伴随着桥式羰基谱带的出现,这意味表面次羰基合物的形成,原子簇上的羰,同时伴随着桥式羰基谱带的出现,这意味着表面次羰基加合物的形成,原子簇上的羰基配体可以同13CO同位素进行交换反应  相似文献   

8.
研究了几种小孔分子筛ZSM-5,HY,NaY及β担载ZrO2对C加氢反应的催化作用,并就产物的分布情况与担载ZrO2的硅铝中孔分子筛进行了对比研究。其中中孔分子筛分别用季铵盐和一级胺为模板剂,在水热条件和常温常压下合成;并用BET,XRD,SEM等手段表征了它们的孔道和骨架结构。另外,考察了碱金属K^2+,Na^2+对催化剂催化性能的影响。  相似文献   

9.
利用DTA研究了ErCl_3CaCl_2LiCl三元体系相图。发现该相图有对应于ErCl_3、CaCl_2、LiCl和Li_3ErCl_6的4个液相面,5条二次结晶线,一个三元低共熔点E(58.5%ErCl_3,23.7%CaCl_2,17.8%LiCl,397℃),一个三元转熔点P(52.5%ErCl_3,27.2%CaCl_2,20.3%LiCl,428℃)。相应的4相平衡反应为:L=ErCl_3+Li_3ErCl_6+CaCl_2;L+LiCl=Li_3ErCl_6+CaCl_2.  相似文献   

10.
微波法制备Al2O3/NaY新型复合多孔催化材料   总被引:9,自引:0,他引:9  
微波法制备Al2O3/NaY新型复合多孔催化材料孙德坤朱建华时吉须沁华(南京大学化学化工学院化学系,南京210093)关键词微波辐射,氧化铝,NaY沸石,表面分散,多孔复合材料分类号TQ426收稿日期:19970217.孙德坤:女,1941年生,...  相似文献   

11.
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   

12.
KMnO4-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.  相似文献   

13.
The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.  相似文献   

14.
A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.  相似文献   

15.
Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.  相似文献   

16.
The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp3)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp2)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp2)?H and aliphatic 1,5- and 1,6-C(sp3)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp3)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp2)?H insertion.  相似文献   

17.
The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.  相似文献   

18.
19.
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   

20.
N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).  相似文献   

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