Papers by Author: Lin Yu

Abstract: Wood vinegar, as one of the main products of pyrolysis of wood, is very useful, but its system is not stable, easy to produce surface floating oil and precipitation. By test, it was found that 200 mg cetyl trimethyl ammonium bromide (CTMAB) was added to a liter of wood vinegar, and was stirred for 2 hours, wood vinegar surface floating oil and precipitation could be greatly reduced . It would provide useful data for the subsequent development of the wood vinegar.

Abstract: To improve the structure order and catalytic activity of mesoporous materials, cubic (SBU-MCM-48) and hexagonal (SBU-MCM-41) mesoporous aluminosilicates containing secondary building units characteristic of zeolite Beta have been prepared, and characterized by means of XRD, N₂ adsorption, IR spectroscopy, catalytic cracking reaction compared with the corresponding MCM-41. We found that the introduction of secondary building units characteristic of zeolite Beta into the mesopore wall could be an effective route to improve the acidity of mesoporous materials. Moreover, cubic SBU-MCM-48 has been more active than hexagonal SBU-MCM-41 for cumene cracking reaction.

Abstract: A new solid cerium complex, was synthesized by 8-hydroxyquinoline and cerium nitrate in the ethanol-aqueous solution. The complex was characterized by elemental analysis and FTIR. The results indicate that the complex is Ce(C₉H₆NO)₃. The tribological properties of the Ce(C₉H₆NO)₃ particles as additive in paraffin oil was investigatedon MRS-10A four-ball tester, the results indicate that Ce(C₉H₆NO)₃ particles as additive can be effective in improving anti-wear ability, in enhancing extreme-pressure capacity. The wear scar width can be decreased 0.3mm when the additive in paraffin oil is about 0.25wt.%, when the additive in paraffin oil is about 0.5wt.%, load-carrying capacity can improve 29%. The morphologies, typical element distribution of the worn surfaces were characterized by SEM and EDS, respectively. Its anti-wear mechanism as follows: A permeating layer with rare earth elements was produced in the frictional sub-surface, the layer modified the microstructure and the lubricating state of the frictional surface.

Abstract: Soy protein isolates (SPI) were modified by ultrasound treatment (200W, 400W, 600W), and the emulsifying properties of USPI (ultrasound treated SPI) were investigated. Analysis of mean droplet sizes and creaming indices of emulsions (20% v/v oil, 1.6% w/v emulsifier) formed by control SPI and USPI-200−600W showed that ultrasound treatment could improve the emulsifying capability and emulsion stabilizing ability (against creaming) of SPI. And the improvements were significantly influenced by the power level of ultrasound. Some USPI (e.g., 400W) was capable of producing stable fine emulsions. A variety of physicochemical and interfacial properties of USPI in relation to emulsifying properties have been investigated. The results showed that compared with control SPI, USPI-400W had a higher protein adsorption fraction (F_ads) and a lower saturation surface load (Г_sat), which was mainly due to its higher PS and surface hydrophobicity (H₀), and may explain its markedly improved emulsifying capability. This study showed that ultrasound treatment could be an effective way for the functionality modification of globular proteins.

Abstract: The Dopamine-modified multiwalled carbon nanotubes (MWNT-Dopa) were synthesized by chemical reaction between dopamine (Dopa) and multiwalled carbon nanotubes which oxidazed by mixed-acid (MWNT-COOH). The structure of MWNT-Dopa were analyzed by Fourier transform infrared spectroscopy (FT-IR), Thermogravimetric (TG), Transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques and the dispersity of MWNT-Dopa were studied by Dispersion stability analyzer. The results show that dopamine has been grafted on multiwalled carbon nanotubes successfully, and a dopamine layer which wraps on the surface of multiwalled nanotubes make multiwalled nanotubes have outstanding dispersity in water.

Abstract: Pure wood vinegar is widely used in industry, agriculture and other areas as regulators, but the wood vinegar which produced usually is filled with oil on the surface .The paper mainly study on removing the floating oil on the surface of wood vinegar,choosing the best surfactant called Tween 80 to removing the floating oil and making wood vinegar in a steady system. By this way, it will not appear oil on the surface of wood vinegar for more than half an year, which will broaden the commercial application of wood vinegar

Abstract: Catalytic combustion of toluene on Cu-Mn complex oxides was investigated. The catalysts were prepared by urea-based hydrothermal method and characterized by XRD and SEM. It was found that both the decrease of the Cu/Mn molar ratio and the increase of reaction time contributed to improving catalytic activity for toluene combustion. The temperature for 99% conversion of toluene (T₉₉) was lowered to 210°C. The main crystalline phases of Cu-Mn complex oxides were CuO and Cu_0.45Mn_0.55O₂. It was showed that the existence and high dispersion of Cu-Mn complex oxides were related to the catalytic combustion activity.

Abstract: In this paper, the influence of different sintering temperatures on the microstructure, density, shrinkage and final phase content of hydroxyapatite-zirconia (HA-ZrO₂) composites was studied. Composites of hydroxyapatite with 3 mol% Y₂O₃ stabilized zirconia with MgO were sintered between 1100 °C and 1400 °C. The reaction and the transformation of phases were investigated by X-ray diffraction and FTIR spectroscopic measurements. Those results indicated that the processes of HA dehydroxylation were found, the mean grain size of the sample sintered was varied from 1.2 µm to 5.3 µm. Dimension shrinkage increased to 0.24% as the sintered temperature increased from 1100 °C to 1400 °C, the bulk density increased monotonically to 95.6% with increasing temperature up to 1400 °C.

Abstract: The styrene-acrylic emulsion modified by the ethylsiloxane as a cross-linking monomer and the hydroxyl phosphate as a flash-rust functional monomer was synthesized. The waterborne anti-corrosion coating film prepared by the styrene-acrylic emulsion exhibits a good overall performance, especially the an excellent corrosion resistance.

Abstract: Catalytic combustion of volatile organic compounds (VOCs) is a high efficient and low-polluted technique. In this paper, the palladium-based combustion catalysts on cordierite honeycomb ceramics (CHC) substrate without interlayer film — Pd/CHC, were prepared by electroless plating method, and the effect of preparing conditions for the catalysts on the catalytic performance of toluene combustion was mainly studied. The optimal conditions were confirmed as follows: plating bath temperature is 60°C, plating time is 30min, palladium salt concentration is 0.2g/L, and calcination temperature after plating is 500°C. Finally, the stability test further indicated that the Pd/CHC catalyst prepared by the optimal electroless plating conditions has good catalytic stability.