The cobalt precursor affects the catalytic performance of Co/SiO_2 catalyst remarkably. The catalyst prepared from cobalt acetate exhibits excellent activity, stability and resistance to carbon deposition.
Ni(Co/Zn/Cu)Fe_2O_4/SiC@SiO_2, a microwave absorber, was prepared by the sol-gel method. The phase structure and the morphology of the microwave absorbers were characterized by X-Ray Diffraction(XRD) and scanning elec...Ni(Co/Zn/Cu)Fe_2O_4/SiC@SiO_2, a microwave absorber, was prepared by the sol-gel method. The phase structure and the morphology of the microwave absorbers were characterized by X-Ray Diffraction(XRD) and scanning electron microscopy(SEM), respectively. Laser sizer(LS) and X-ray photoelectron spectroscopy(XPS) analysis show the core-shell structure of SiC@SiO_2. Coaxial method was used to measure the microwave absorption properties of the prepared composites in the frequency range of 2-18 GHz. When 70 wt% SiC is wrapped by 30 wt% SiO_2,and 50 wt% NiFe_2O_4 is added into 50 wt% SiC@SiO_2, the as-prepared powders are found to have advanced microwave absorption properties with a minimum reflection loss(RL) of -32.26 dB at about 6.08 GHz, and the available bandwidth is approximately 2.1 GHz when the RL is below -10 dB.展开更多
Rare earth doped silica films were prepared by sol-gel method accompanied with the spin-coating process. It was found that the photoluminescence (PL) property of the thin films was dependent strongly on the doping amo...Rare earth doped silica films were prepared by sol-gel method accompanied with the spin-coating process. It was found that the photoluminescence (PL) property of the thin films was dependent strongly on the doping amount of Eu3+. For thin films annealed at 700 ℃, the PL intensity increased constantly as elevating the doping amount up to 10% without any evident concentration quench, which indicated the good doping property of the SiOmatrix. In order to further improve the PL efficiency, co-doping of Tb3+ into SiO∶Eu3+ thin films were also investigated. It was found that the luminescence intensity was obviously enhanced by co-doping which could be explained in terms of the effective energy transfer from Tb3+ to Eu3+.展开更多
本文利用 HRuCo_3(CO)_(12)原子簇化合物制备了 Ru-Co/SiO_2双金属催化剂,并研究了它们在 CO 加氢反应中的催化性能。结果表明,若和由[Et_4N][HRu_3(CO)_(11)]、Co_4(CO)_(12)以及 Co_4(CO)_(12)+[Et4N][HRu_3(CO0)_(11)]和 CoCl2+RuCl_...本文利用 HRuCo_3(CO)_(12)原子簇化合物制备了 Ru-Co/SiO_2双金属催化剂,并研究了它们在 CO 加氢反应中的催化性能。结果表明,若和由[Et_4N][HRu_3(CO)_(11)]、Co_4(CO)_(12)以及 Co_4(CO)_(12)+[Et4N][HRu_3(CO0)_(11)]和 CoCl2+RuCl_3制备的 Ru/SiO_2、Co/SiO_2和 Ru/SiO_2+Co/SiO_2催化剂相比,由 HRuCO_3(CO)_(12)制备的催化剂在 CO 加氢反应中显示了很高的 CO 转化率和含氧化合物的选择性。通过光电子能谱方法可认为,具有近距离的 Ru-Co^(2+)双金属原子中心是 CO 加氢反应中形成含氧化含物的活性中心。展开更多
Ni/Co/SiO_(2) hydrophobic coatings were fabricated by embedding SiO_(2) nanoparticles into Ni/Co coatings using pulsed electrodeposition,followed by a liquid-phase hydrophobic treatment.Microstructure and morphology a...Ni/Co/SiO_(2) hydrophobic coatings were fabricated by embedding SiO_(2) nanoparticles into Ni/Co coatings using pulsed electrodeposition,followed by a liquid-phase hydrophobic treatment.Microstructure and morphology analysis of the composite coatings revealed that the SiO_(2) nanoparticles were homogenously distributed in the Ni/Co coating,and the surfaces of the samples were close-grained without crack.Furthermore,the SiO_(2) nanoparti-cles in the coating formed micro-nano structures on its surface,such that the contact angle reached 125°following the hydrophobic modification.The surface of the hydrophobic coating was found to be abrasion resistant and ex-hibited long-term stability in water.The corrosion inhibition efficiency of the Ni/Co/SiO_(2) hydrophobic coatings on a Q235 carbon steel substrate in simulated seawater solution reached 98.6%,indicating optimal anti-corrosion performance.展开更多
基金supported by the National High-Tech Research and Development Program of China(863)(2012AA101806)National Natural Science Foundation of China(21306195,51276183)~~
文摘The cobalt precursor affects the catalytic performance of Co/SiO_2 catalyst remarkably. The catalyst prepared from cobalt acetate exhibits excellent activity, stability and resistance to carbon deposition.
基金The project was supported by the Foundation of State Key Laboratory of Coal Conversion(J20-21-612)the Initiation Foundation of Henan Polytechnic University(B2019-54)Henan Key Laboratory of Coal Green Conversion(CGCF201910).
基金financially supported by the Military Project of the Ministry of National Defense of China (No. JPPT-125-2-168)
文摘Ni(Co/Zn/Cu)Fe_2O_4/SiC@SiO_2, a microwave absorber, was prepared by the sol-gel method. The phase structure and the morphology of the microwave absorbers were characterized by X-Ray Diffraction(XRD) and scanning electron microscopy(SEM), respectively. Laser sizer(LS) and X-ray photoelectron spectroscopy(XPS) analysis show the core-shell structure of SiC@SiO_2. Coaxial method was used to measure the microwave absorption properties of the prepared composites in the frequency range of 2-18 GHz. When 70 wt% SiC is wrapped by 30 wt% SiO_2,and 50 wt% NiFe_2O_4 is added into 50 wt% SiC@SiO_2, the as-prepared powders are found to have advanced microwave absorption properties with a minimum reflection loss(RL) of -32.26 dB at about 6.08 GHz, and the available bandwidth is approximately 2.1 GHz when the RL is below -10 dB.
基金the NSF of China (60425414 ,10574069)State Key Program for Basic Research (2007CB613401)
文摘Rare earth doped silica films were prepared by sol-gel method accompanied with the spin-coating process. It was found that the photoluminescence (PL) property of the thin films was dependent strongly on the doping amount of Eu3+. For thin films annealed at 700 ℃, the PL intensity increased constantly as elevating the doping amount up to 10% without any evident concentration quench, which indicated the good doping property of the SiOmatrix. In order to further improve the PL efficiency, co-doping of Tb3+ into SiO∶Eu3+ thin films were also investigated. It was found that the luminescence intensity was obviously enhanced by co-doping which could be explained in terms of the effective energy transfer from Tb3+ to Eu3+.
文摘本文利用 HRuCo_3(CO)_(12)原子簇化合物制备了 Ru-Co/SiO_2双金属催化剂,并研究了它们在 CO 加氢反应中的催化性能。结果表明,若和由[Et_4N][HRu_3(CO)_(11)]、Co_4(CO)_(12)以及 Co_4(CO)_(12)+[Et4N][HRu_3(CO0)_(11)]和 CoCl2+RuCl_3制备的 Ru/SiO_2、Co/SiO_2和 Ru/SiO_2+Co/SiO_2催化剂相比,由 HRuCO_3(CO)_(12)制备的催化剂在 CO 加氢反应中显示了很高的 CO 转化率和含氧化合物的选择性。通过光电子能谱方法可认为,具有近距离的 Ru-Co^(2+)双金属原子中心是 CO 加氢反应中形成含氧化含物的活性中心。
基金the Distinguished Taishan Scholars in Climbing plan(No.tspd20161006).
文摘Ni/Co/SiO_(2) hydrophobic coatings were fabricated by embedding SiO_(2) nanoparticles into Ni/Co coatings using pulsed electrodeposition,followed by a liquid-phase hydrophobic treatment.Microstructure and morphology analysis of the composite coatings revealed that the SiO_(2) nanoparticles were homogenously distributed in the Ni/Co coating,and the surfaces of the samples were close-grained without crack.Furthermore,the SiO_(2) nanoparti-cles in the coating formed micro-nano structures on its surface,such that the contact angle reached 125°following the hydrophobic modification.The surface of the hydrophobic coating was found to be abrasion resistant and ex-hibited long-term stability in water.The corrosion inhibition efficiency of the Ni/Co/SiO_(2) hydrophobic coatings on a Q235 carbon steel substrate in simulated seawater solution reached 98.6%,indicating optimal anti-corrosion performance.
