排序方式: 共有16条查询结果,搜索用时 15 毫秒
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Vladislav Sadykov Vladimir Sobyanin Natalia Mezentseva Zakhar Vostrikov Vladimir Pelipenko Sergey Tikhov Lyudmila Bobrova Julian R.H. Ross Vladimir Ulyanitskii 《Fuel》2010,89(6):1230-180
Active components comprised of fluorite-like Lnx(Ce0.5Zr0.5)1−xO2−y (Ln = La, Pr, Sm) and perovskite-like La0.8Pr0.2Mn0.2Cr0.8O3 mixed oxides and their composites with yttria-doped zirconia (YSZ) promoted by precious metals (Pt, Ru) and/or Ni were supported on several types of heat-conducting substrates (compressed Ni-Al foam, Fecralloy foil or gauze protected by corundum layer, Cr-Al-O microchannel cermets, titanium platelets protected by oxidic layer) as well as on honeycomb corundum monolithic substrate. These structured catalysts were tested in pilot-scale reactors in the reactions of steam reforming of methane, selective oxidation of decane and gasoline and steam/autothermal reforming of biofuels (ethanol, acetone, anisole, sunflower oil). Applied procedures of supporting nanocomposite active components on monolithic/structured substrates did not deteriorate their coking stability in real feeds with a small excess of oxidants, which was reflected in good middle-term (up to 200 h) performance stability promising for further up-scaling and long-term tests. Equilibrium yield of syngas at short contact times was achieved by partial oxidation of decane and gasoline without addition of steam usually required to prevent coking. For the first time possibility of successive transformation of biofuels (ethanol, acetone, anisole, sunflower oil) into syngas at short contact times on monolithic catalysts was demonstrated. This was provided by a proper combination of active component, thermal conducting monolithic substrates and unique evaporation/mixing unit used in this research. 相似文献
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Alexander A. Khassin Vladimir V. Pelipenko Tatyana P. Minyukova Vladimir I. Zaikovskii Dmitrii I. Kochubey Tamara M. Yurieva 《Catalysis Today》2006,112(1-4):143-147
The catalytic activity of CuZn catalysts in the synthesis of methanol is related to those reduced Cu species, which originate from the CuxZn1−xO solid solution of wurtzite-like structure. Copper cations in the CuxZn1−xO solid solution are localized in the extended stacking faults of the ZnO lattice. Copper sites could be supposedly described as the product of introducing (OH)Cu(OH) to the planar defects of zinc oxide structure. Hydroxyl groups stabilize the planar defects of ZnO. The process of the samples reduction leads to the formation of flat Cu0 particles over the surface of zinc oxide. The planar defects of ZnO structure are preserved in the reduced state. During the reoxidation, copper atoms return back to the extended stacking faults of ZnO as the tape-like clusters of flat-square coordinated copper cations. 相似文献
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Uncontrolled flows of reservoir fluids behind the casing are relatively common in primary cementing and can lead to any of the following: blowout, leakage at surface, destruction of subsurface ecology, potential contamination of freshwater, delayed or prevented abandonment, as well as loss of revenue due to reduced reservoir pressures. One significant potential cause is ineffective mud removal during primary cementing. Ideally, the drilling mud is displaced all around the annulus and the displacement front advances steadily up the well at the pumping velocity. This paper addresses the question of whether or not such steady-state displacements can be found for a given set of process parameters. 相似文献
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Samoylov A. M. Pelipenko D. I. Ivkov S. A. Tyulyakova E. S. Agapov B. L. 《Inorganic Materials》2022,58(1):48-55
Inorganic Materials - X-ray diffraction and scanning electron microscopy data demonstrate that the thermal stability limit of thin PdO films in an oxygen atmosphere rises from 1083 ± 5 to 1133... 相似文献