共查询到20条相似文献,搜索用时 15 毫秒
1.
Yoshitake Masuda Kazumi Kato Masahito Kida Jun Otsuka 《International Journal of Applied Ceramic Technology》2019,16(5):1807-1811
SnO2 nanosheets were developed to detect nonanal gas in the order of ppb which was a marker of lung cancer. The nanosheets showed higher resistance change in nonanal gas than that in carbon monoxide (CO), nitrogen dioxide (NO2), acetone (CH3COCH3), hydrogen (H2), ethanol (C2H6O), ammonia (NH3), hydrogen sulfide (H2S), formaldehyde (HCHO), acetaldehyde (CH3CHO), or butanal (C4H8O). Crystal surfaces of the nanosheets would be effective for adsorption of nonanal molecules. Furthermore, it was shown that resistance changed with an increase in carbon number in aldehyde. The nanosheets had molecular selectivity for a series of aldehyde molecules. Molecular recognition of the nanosheets gave us a great advantage to detect nonanal gas which was produced by lung cancer. 相似文献
2.
Erik Larsson 《Advanced Synthesis \u0026amp; Catalysis》1978,320(3):353-360
Preparation, Configurations and N.M.R. Dates of the Acids CH3(SR)CHCOOH (R C6H5, CH2C6H5, CH2COOH) The cis and trans isomers of the acids CH3(SR)CHCOOH (R C6H5, CH2C6H5, CH2COOH) were prepared by addition of HSR to CH3CCCOOH in alkaline water solution and by alkaline hydrolysis of CH3C(SR)2CH2COOC2H5 (R C6H5, CH2C6H5, CH2COOC2H5). The oxidation products CH3C(SO2R) CHCOOH (R C6H5, CH2COOH) were also prepared. The n.m.r. dates of the acids were obtained and some relations between them were discussed. 相似文献
3.
Erik Larsson 《Advanced Synthesis \u0026amp; Catalysis》1976,318(5):761-767
The Configuration of Some Compounds Prepared by Addition of Thiols to Acetylene Dicarboxylic Acid The acids RSC(COOH) = CHCOOH 3 with R = HOOCCH2, HOOCCH(CH3), C6H5, C6H5CH2, p-ClC6H4CH2 and C6H5CH(CH3) have been prepared by addition of thiols RSH to acetylene dicarboxylic acid (alkali salt) in aqueous alkaline solution. It has been shown that only trans-isomers 3 and no cis-isomers 4 are formed. The methyl esters of 3 could be partially isomerized to yield the corresponding cis-esters. No cis-acids could be obtained by saponification of the latter. 相似文献
4.
Block copolymers having a pendant trichlorogermyl group as a part of polyamide segment? (CO? R′? CO? NH? Ar? NH? )xCO? R′? CO? and polydimethylsiloxane of general formula [(? CO? R′? CO? HN? Ar? NH)x? CO? R′? CO? NH(CH2)3SiO(CH3)2 ((CH3)2SiO)ySi(CH3)2(CH2)3 NH? ]n (where R′ = CH2CH(GeCl3), CH(CH3)CH(GeCl3), CH(GeCl3)CH(CH3); Ar = C6H4, (? C6H3? CH3)2, (? C6H3? OCH3)2, 2,5‐(CH3)2? C6H2, C6H4? O? C6H4) were prepared by a polycondensation reaction and characterized using CHN and Ge analysis, Fourier transform infrared (FTIR) and 1H NMR spectroscopy, thermogravimetric analysis (TGA) and molecular weight determination. They have a lamellar structure with weight‐average molecular weight in the range 1.21 × 105–4.79 × 105 g mol?1. These copolymers display two glass transition temperatures and have an average decomposition temperature of 489 °C. TGA, FTIR and gas chromatography/mass spectrometry studies indicate that degradation of these block copolymers results in carbon monoxide, oligomeric siloxanes and polyamide fragments. They are thermally stable due to the hydrogen bonded interlinked chains of polyamide, while they absorb water due to the presence of Ge? Cl bonding. Copyright © 2010 Society of Chemical Industry 相似文献
5.
The reaction of O2, O3, and CH4 or C2H6 of 7.76, 0.24 and 92% of the hydrocarbon respectively (residence time of 8.8 min) at 1 atm, and 400 °C for CH4 and 300 °C for C2H6 gave CO, CO2, H2O, CH2O and CH3OH from CH4 and in addition CH4, C2H4, CH3CHO and C2H5OH from C2H6. No reaction occurred when O3 was absent indicating that the partial oxidation was sensitized (initiated) by the oxygen atoms formed by the decomposition of ozone. 相似文献
6.
A microwave/UV/ozone/TiO2 photocatalyst hybrid process system, which is a combination of various propylene gas treatment techniques, is evaluated for use as an advanced, efficient technology for air pollution treatment. TiO2 photocatalyst balls were prepared using low-pressure metal-organic chemical vapor deposition. The microwave/UV/TiO2 photocatalyst hybrid process exhibited the higher degradation efficiency than the microwave/UV/alumina ball hybrid system. The degradation efficiency increased almost linearly with increasing ozone dose. The lower the propylene inlet concentration was the higher degradation efficiency. The double bond of propylene is broken by ozone and OH, resulting in production of CH4 and C2H6. These two intermediate products are mineralized into CO2, H2O, and CO. C2H4 and C3H8 may be produced from CH4, whereas C2H6 and C3H6 are produced by microwave irradiation. 相似文献
7.
《Inorganic chemistry communications》2000,3(7):337-340
We report a novel, high yield one-step synthesis of water stable and soluble titanocene dichloride dihydrochloride salts from the direct reaction of the neutral amino-substituted cyclopentadienes with TiCl4. The following novel complexes have been synthesised: C5H4(CH2)2N(CH2)5]2TiCl2 (5), [C5H4CH(CH2)4NMe]2TiCl2 (6), [C5H4(CH2)2N(CH2)5]2TiCl2·2HCl (7), [C5H4CH(CH2)4]2NMeTiCl2·2HCl (8), [C5H4(CH2)2N(CH2)5]2TiMe2 (9). 相似文献
8.
《Ceramics International》2016,42(14):15119-15141
Since the sensing capability of semiconducting metal oxides was demonstrated in the 1960s, solid state gas sensors based on these materials have attracted considerable attention from both scientific and practical point of view. Because of the promising characteristics for detecting toxic gases and volatile organic compounds (VOCs) compared to conventional techniques, these devices are expected to play a key role in environmental monitoring, chemical process control, personal safety and so on in the near future. Therefore, in recent years, intensive studies have been conducted to improve their sensing performances, particularly to increase the sensitivity and detection limit of such devices. This can be accomplished by using metal oxide nanostructures with various shapes such as nanoparticles, nanowires, nanorods and nanotubes having sizes in the nanometer range. Owing to the high surface-to-volume ratios and consequently large number of surface sites exposed to target gas, nanostructured metal oxides enable a larger gas-sensing layer interaction and hence a higher sensitivity in comparison with conventional materials.This article extensively reviews recent developments in this field, focusing the attention on the detection of some common VOCs, including acetone (C3H6O), acetylene (C2H2), benzene (C6H6), cyclohexene (C6H10), ethanol (C2H5OH), formaldehyde (HCHO), n-butanol (C4H9OH), methanol (CH3OH) toluene (C7H8), and 2-propanol (C3H8O), by means of conductometric solid state sensors based on nanostructured semiconducting metal oxides. 相似文献
9.
Erik Larsson 《Advanced Synthesis \u0026amp; Catalysis》1977,319(6):857-861
The Configurations and Conformations of Some Unsymmetrical S-Substituted 2,3-Dimercapto Succinic Acids Some acids HOOCCH(SR)CH(SR′)COOH (R/R′ = HOOCCH2, C6H5, C6H5CH2 and p-ClC6H4CH2, R ≠ R′) were prepared from HOOCC(SR) CHCOOH and R′SH. Their configurations and conformations were discussed. 相似文献
10.
11.
C,N-chelated dicyclopentadienylzirconium complexes and their possible use as hydrogenation catalysts
Josef Bareš Zdeňka Padělková Philippe Meunier Nadine Pirio Didier Poinsot Aleš Růžička 《Inorganic chemistry communications》2010,13(12):1512-1514
In situ generated Cp2Zr(n-Bu)Cl (6) reacts with {2-[(CH3)2NCH2]C6H4}2Pb to form exclusively {2-[(CH3)2NCH2]C6H4}Cp2ZrCl (7), [(CH3)2NCH2]C6H5, butene and elemental lead. The further derivatization of chloride (7) to fluoride (8), hydride (9), methyl derivative (10), and a reduction of 7 are also described. The crystal structures of 7–10 were determined. The catalytic activity of 9 and 10 in hydrogenation of styrene was also preliminarily tested. 相似文献
12.
The aqueous-phase processing (APP) of biomass-derived bio-oil model compounds such as ethanol, acetaldehyde, formic acid and acetic acid over Pt?CRe/C was examined. For the APP of ethanol at 250?°C, the product distribution was determined and quantified. H2, CO2, CH4, C2H6, acetaldehyde, ethyl ether, ethyl acetate, acetic acid were found to be primary products and C3H8, methanol, butanol and acetal were found to be minor products. By also exploring the product distributions of acetaldehyde, acetic acid and formic acid under APP conditions with the Pt?CRe/C, the reaction network associated with the APP conversion of ethanol was determined. Using this reaction network, flux analysis was performed on the ethanol reaction system to determine the reaction pathway and relative rates (v1?Cv8) for each step. From this analysis, it was found that the dehydrogenation of the ethanol was the most active reaction in the reaction system. 相似文献
13.
Rolf Gelius Otto Heimann Ralph Grünberg Ingrid Krauss Ruth Skorny 《Advanced Synthesis \u0026amp; Catalysis》1976,318(1):96-104
Poly-n-alkyl-methylsiloxanes: Effective Cloud Point and Pour Point Depressants for Petroleum Distillates Linear poly-n-alkyl-methylsiloxanes of the formulae (CH3)3Si-[OSi(CH3)R]n-OSi(CH3)3 with R = C12H25, C14H29, C16H33 and n ⩽ 8 were prepared by various synthetic methods. Both these substances and the analogous cyclic siloxane derivates [OSi(CH3)R]m (m = 3…6) were found to be effective cloud point and pour point depressants for petroleum middle distillates. Some ideas concerning the mechanism of could point depression are discussed. 相似文献
14.
β-Alkoxypropionic acids and their methyl esters were made with alkoxy groups ranging from C4H9O to C18H35O: R-O-CH2CH2COOH (CH3). Methyl esters and acids were also made with one and with two oxyethylene groups between the alkoxy group and the propionic
acid group: RO (CH2 CH2 O) n-CH2CH2 COOH(CH3). The compounds were tested againstStaphylococcus aureus and againstPenicillium for growth inhibition. The optimum size of the alkoxy group appears to be R=C12H25. Oxyethylene groups enhanced the activity againstS. aureus, but had relatively little effect againstPenicillium. 相似文献
15.
《Journal of Catalysis》2007,245(1):124-132
Intermediate species formed on ZSM-5 zeolites during the selective catalytic reduction of NO by acetylene (C2H2-SCR) were investigated by transmittance FTIR and temperature-programmed desorption, to elucidate the different catalytic performance of the proton and sodium forms of ZSM-5. Bidentate nitrates formed exclusively on HZSM-5 were very active toward the reductant, whereas the nitrates associated with the Na+ ions on NaZSM-5 were inert. Although the saturation adsorption amount of acetylene on NaZSM-5 was about five times higher than that on HZSM-5 at 80 °C, most of the acetylene on NaZSM-5 was desorbed below 200 °C, whereas a considerable amount of acetylene was detected above 250 °C on HZSM-5 in TPD. The strongly adsorbed species formed on acetylene adsorption was vinyl alcohol (CH2CHOH) bound to the Brønsted acid sites that could be converted to acetate species at elevated temperatures on HZSM-5. Based on our results, a mechanism of the C2H2-SCR on HZSM-5 was proposed in which the bidentate nitrates and acetate species formed exclusively on HZSM-5 react with each other, leading to NOx elimination, which explains why the behavior of HZSM-5 is quite different from that of NaZSM-5 in the C2H2-SCR. 相似文献
16.
N-substituted aminodiamides of the general structure, RNHCO (CH2)x -CONH(CH2)yN(CH3)2, and the corresponding N-sulfopropyl derivatives were studied for their inhibiting effect on growth ofClostridium botulinum in culture media. With R = C16H33, more activity was observed with x = 2, 3, or 4 and y = 2, 3, or 4 than with R = C12H25 or C10H21 . There was little or no correlation of activity with the length of the x or y chains, but the addition of the sulfopropyl
group resulted in decreased inhibitory activity. The C3 to C18 saturated aliphatic amines used for synthesizing the aminodiamides were effective inhibitors ofC. botulinum; tetradecyl-, pentadecyl-, and hexadecylamines were the most active with minimum inhibitory concentrations (MIC) of 0.8 μ/ml-The
ratio of molecular weights of the diamides to the corresponding aliphatic amines indicated that most if not all of the inhibitory
activity of the aminodiamides could be attributed to the amine moiety. 相似文献
17.
Catalytic synthesis of di(methylphenyl)methane (CH3C6H4CH2C6H4CH3, DMPMs) from toluene and formaldehyde were investigated over various solids acids. At 140 °C and toluene/HCHO = 5/1, the conversion of HCHO over zeolite (Hβ, H-mordenite, HX, HY and HZSM-5) is limited, while heteropolyacids (H3PW12O40, H4SiW12O40 and H3PMo12O40) exhibited higher activity and DMPMs selectivity. The best yield of DMPMs reached 81.5% (conversion of HCHO nearly 100%). H3PW12O40 could be recovered by simply drying and the recycle-used catalyst remained its activity and structure in five runs. 相似文献
18.
Jiangwen Li 《Electrochimica acta》2005,51(2):297-303
The adsorptive and stripping behavior of methylene blue (i.e. methylene blue chloride, MB) at a gold electrode has been studied with voltammetry, alternating current impedance spectra (ACIS) and quartz crystal microbalance (QCM). MB exhibits a pair of cyclic voltammetry peaks at about −0.3 V (versus SCE) in 0.05 M pH 6.9 phosphate buffer solutions. In the presence of cationic gemini surfactants such as C16H33N(CH3)2-C4H8-N(CH3)2C16H33Br2 (C16-C4-C16), C16H33N(CH3)2-C4H7OH-N(CH3)2C16H33Br2 (C16-C4OH-C16), C16H33N(CH3)2-CH2-C6H4-CH2-N(CH3)2C16H33Br2 (C16-ph-C16) and C16H33N(CH3)2-C12H24-N(CH3)2C16H33Br2 (C16-C12-C16), the anodic peak grows rapidly and moves in positive direction, but the cathodic peak gradually decreases, due to the association adsorption and electrostatic interaction of the geminis with MB and its reduced product (i.e. leuko methylene blue, LMB). With the aid of geminis the adsorption amount of MB increases under open-circuit, but the impedance of the mixed adsorption film to Fe(CN)63−/4− almost keeps unchanged, compared with either bare gold electrodes or MB film, while the adsorption film of geminis exhibits greater impedance. This probably is due to the electron medium action of MB in the film. Gemini surfactants with same alkyl-chain (i.e. -(CH2)15CH3) but different molecular structure, exhibit different influence. The enhancing action of geminis studied follows such order as: C16-ph-C16 > C16-C4-C16 > C16-C4OH-C16 > C16-C12-C16. The change of peak potential was ascribed to the interaction between MB and surfactants, as well as the blocking action of surfactant film. For comparison, the influence of dihexadecyldimethylammonium bromide (DCAB) and cetyltrimethylammonium bromide (CTAB) was studied, and the influence of other factors is discussed as well. 相似文献
19.
《Inorganic chemistry communications》1999,2(3):104-106
New substituted alkoxylalkylcyclopentadienyl titanium trichloride complexes, CH3OCH2CH(CH3)C5H4TiCl3 (3), CH3OCH(CH3)CH2C5H4TiCl3 (4) and CH3OCH2CH2CH2C5H4TiCl3 (5) have been synthesized and 3 has been studied by X-ray diffraction. The crystal structure of 3 shows that there is an intramolecular coordination between the ethereal oxygen atom in the side chain on the Cp ring and the titanium atom with an average Ti–O bond length of 2.24 Å. Due to steric limitation around the coordination sphere of titanium, the oxygen atoms in the side chain in complexes 4 and 5 do not coordinate with the central metals. 相似文献
20.
Juan Fernández Jessely Molina Tamara Rajmankina José Arévalo álvaro Parada 《Polymer Bulletin》2007,59(5):629-636
Summary (C5H5)2Zr(O2C)CH3 and (C5H5)2Zr(O2C)CH2CH3 complexes were synthesized, characterized and activated with MAO for ethylene polymerization. The highest catalytic activity
was achieved at Al/Zr molar ratio of 3000 for both systems. The effects of the size of the R group in the carboxylate ligands,
the Al/Zr molar ratio and reaction temperature on the catalytic activity and polymer properties were studied and discussed. 相似文献