3篇
您的检索式：作者名="GUO Pengxin"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Air-promoted selective hydrogenation of phenol to cyclohexanone at low temperature over Pd-based nanocatalysts显示文摘Attaining high activity with high selectivity at low temperature is challenging in the selective hydrogenation of phenol to cyclohexanone due to its high activation energy(E_a, 55–70 kJ/mol). Here we report a simple and efficient strategy for phenol hydrogenation catalyzed by Pd in aqueous phase at 30 °C by introducing air to promote the catalysis. With the assistance of air, >99% conversion and >99% selectivity were achieved over Pd(111)/Al_2O_3 with an overall turnover frequency(TOF) of621 h^(-1), ~80 times greater than that of the state-of-art Pd catalyst at 30 °C. Mechanism studies revealed that phenol was activated to generate phenoxyl radicals. The radicals were yielded from the reaction between phenol and hydroxyl radicals in the presence of hydrogen, oxygen and protic solvent on Pd. The phenoxyl pathway resulted in a low apparent E_a(8.2 kJ/mol) and thus high activity. More importantly, this strategy of activating substrate by air can be adapted to other Pd based catalysts, offering a new thinking for the rational design of cyclohexanone production in industry. | Qing Guo Shiguang Mo Pengxin Liu Weidong Zheng Ruixuan Qin Chaofa Xu Youyunqi Wu Binghui Wu Nanfeng Zheng | 2017 | Science China Chemistry2017，60，11： | 1 |
| 2 | A decomposition formula for the wall heat flux of a compressible boundary layer显示文摘Understanding the generation mechanism of the heat flux is essential for the design of hypersonic vehicles.We proposed a novel formula to decompose the heat flux coefficient into the contributions of different terms by integrating the conservative equation of the total energy.The reliability of the formula is well demonstrated by the direct numerical simulation results of a hypersonic transitional boundary layer.Through this formula,the exact process of the energy transport in the boundary layer can be explained and the dominant contributors to the heat flux can be explored,which are beneficial for the prediction of the heat and design of the thermal protection devices. | Dong Sun Qilong Guo Xianxu Yuan Haoyuan Zhang Chen Li Pengxin Liu | 2021 | Advances in Aerodynamics2021，3，1： | 0 |
| 3 | Research on Landscape Energy-Saving Integrated Water Curtain System显示文摘Aiming at the serious heat and cold loss of the building glass curtain wall in the field of amusement and tourism,and the need to meet the landscape requirements of the building facade,this paper put forward the idea of integrating the shading and consumption reduction of glass curtain wall with the landscape requirements,that is,the water curtain was set outside the glass curtain wall to form a landscape energy-saving integrated water curtain wall system,while meeting the needs of landscape and shading.By establishing the numerical calculation model of the system,the corresponding relationship between the thickness of water film and the weakening of solar radiation intensity was revealed,as well as the influence of wind speed and wind direction on the nozzle exit angle and velocity selection;and the synergistic law of air flow rate and air temperature drop amplitude.The results showed that the water film thickness at 3-4 cm can reduce the solar radiation by 65%-80%.The temperature of the air layer between the water film and the curtain wall decreased as the air flow rate decreased,when the thickness of water film was 2 cm and the air velocity was 0.5-1.5 m/s,the air temperature dropped to 2.47-3.6°C.Finally,through the analysis of the actual project-ICE World&WATER Park,the system can reduce 66.8%of solar radiation,and reduce the air layer temperature by 3.9°C. | GUO Pengxin LI Hongqiang HE Changjie ZHENG Yingfa LI Shuisheng ZHANG Guoqiang | 2019 | Journal of Thermal Science2019，28，6： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员