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RISS 인기검색어
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- 저자 : Dongfang Wu (검색결과 5 건)
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Dongfang Wu,Yan-Hong Zhang,Yongdan Li 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
Alumina-washcoated FeCrAl alloy sheets are prepared to investigate the effects of metallic substratepretreatments on the mechanical stability of monolithic catalysts. It is shown that chemical and thermalpretreatments produce different effects on the metallic surface morphology and phase, and differentmechanisms are involved in their ways of improving the washcoat adhesion. Combination of chemicaland thermal pretreatments leads to the formation of a-alumina whiskers on corroded and rough metallicsurface, thus giving the most satisfactory washcoat adhesion. It is also pointed out that not onlymechanical shock resistance but also thermal shock resistance is crucial to metallic monolithic catalysts.
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Xiaoxiao Su,Dongfang Wu 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Combination of semiconductors is one of the most efficient ways to improve photocatalytic activities. Plate BiOBr loaded plate Bi2O2CO3 facet is fabricated via one-step hydrothermal process, where urea acts not only as carbon source but as capping agent. As-prepared Bi2O2CO3/BiOBr is of an irregular multi-plate shape, a desirable structure for improved photocatalytic properties. Bi2O2CO3/BiOBr nanoplates with exposed active {001} facet exhibit a ciprofloxacin degradation rate of 90% under visible-light for 4 h. The photodegradation mechanism is speculated. The high activity is attributed to the exposed {001} facet of Bi2O2CO3, formation of heterojunction, extended photoresponse range, and efficient charges carrier transfer.
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Synthesis of Co-doped micro-mesoporous SAPO-11 zeolite for glycerol hydrogenolysis
Xue Li,Dongfang Wu 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.2
Co-doped micro-mesoporous SAPO-11 zeolite (Co-MSAPO-11) was synthesized and used for hydrogenolysis of glycerol. After simultaneous introduction of Co and mesopores, the pore structure and acidic properties of microporous SAPO-11 zeolite are reintegrated. The larger mesopores of Co-MSAPO-11 facilitate the diffusion of molecules and provide more space for the highly dispersed Co species. The appropriate acidity of Co-MSAPO-11 with more Lewis acid sites appears to be more helpful for the activation of reactants to intermediates, potentially increasing the probability of high selectivity to 1,2-propanediol. Therefore, Co-MSAPO-11 shows unique catalytic performance with a glycerol conversion of 94.0% and selectivity to 1,2-PDO of 90.5% under mild conditions. The possible representative model of Co-MSAPO-11 is proposed for the first time.
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Influence of compressor’s tilt angle on the performance of miniature refrigeration system
Xia Chen,Yuting Wu,Chongfang Ma,Chunxu Du,Rui Ma,Dongfang Wang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.1
Vapor compression refrigeration is considered as ideal miniature cooling system for miniature electronic systems and portable cooling systems. Many applications of the miniature refrigeration system are working under the situations (such as aviation field, individual combat system and automobile air conditioning, etc.) that exist bump, tilt, and even flip, which will severely degrade the performance of the miniature refrigeration system. In order to study the influence of compressor’s tilt angle on refrigeration system, a test bench was built and the performance experiments were made. The results show that the compressor’s tilt angle has a great impact on the refrigeration system performance. When the compressor worked at the maximum tilt angle of 60°, COP-c and COP-h of the system change periodically. When the compressor works in full load, the maximum tilt angle for compressor is 20°. When the compressor tilt angle is 15°, there is an optimal amount of refrigerant charge, and corresponding COP-c and COP-h reach the maximum of 2.9 and 3.9, respectively.
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Novel multi-scale diffusion model for catalytic methane combustion
Kai Huang,Lianguang Wang,Yang Xu,Dongfang Wu 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5
A multi-scale model of methane catalytic combustion was built by a series of balance equations and diffusion equations, and these equations were solved through the computational fluid dynamics (CFD) software. The difference between this work and previous model is the diffusion process in catalyst coating was considered. By analyzing the methane conversion, temperature distribution and mass fraction contours of every component, the performance of multi-scale model was compared with that of the pure CFD model without diffusion. The effects of diffusion, methane concentration, flow rate on the methane conversion and temperature distribution of monolithic reactor were also evaluated and discussed by the multi-scale model. The multi-scale model showed better accuracy than the pure CFD model without diffusion process. Different methane concentrations and gas flow rates had enormous effects on the methane conversion and temperature. Therefore, it was beneficial to the reaction process to adjust the methane concentration and gas flow rate appropriately.
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