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好家伙，MacOS 新版本终于删掉自带 Python2，连 Python 死忠粉都叫好！
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<h1>好家伙，MacOS 新版本终于删掉自带 Python2，连 Python 死忠粉都叫好！</h1>
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<a>小詹学Python</a>
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<strong>小詹学Python</strong>
<img alt="" class="profile_avatar&...2022-03-23 12:17:32浏览：95
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Conversion of syngas to higher alcohols over Cu-Fe-Zr catalysts induced by ethanol
Ethanol induced method was applied to prepare Cu-Fe-Zr catalysts for conversion of syngas to higher alcohols. The catalytic performance of the catalysts induced by ethanol was superior to that of the catalyst prepared by the conventional precipitation method. Among various procedures for ethanol induced method,it was found that incorporation of ethanol in the precipitation process was the better. After incorporation of ethanol,the crystal size of CuO decreased and the reduction of copper species became easier. The better activity of Cu-Fe-Zr catalysts prepared by ethanol induced procedures was probably caused by the higher dispersion of Cu species....
2020-10-22 17:35:41浏览：44
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关于变压吸附法从鲁奇合成气中分离CO的研究
为从鲁奇合成气中得到体积分数为98%以上的CO产品气,采用新型载铜分子筛吸附剂对鲁奇合成气进行了变压吸附分离的试验和研究。介绍了实验流程和实验装置;阐述了实验方法和步骤;简述了吸附温度在70℃时和常温时的实验数据。研究结果表明：对于甲烷体积分数高达15%的鲁奇合成气,该吸附剂能够高效地分离出CO,CO产品气的体积分数可达98%以上。义马气化厂新建20万t/a醋酸项目配套CO装置已确定选用该吸附剂。...
2020-10-02 20:35:09浏览：67
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地下空间通风系统的优化
由于车辆出入车库的频率时刻都在变化，车库内单位时间污染物释放量相应发生变化，针对不同工况采取相同的通风量显然是不合理的。过低的通风量将导致车库内空气品质不佳，过高的通风量将导致能源的浪费。本文以某车库为研究对象，进行数值模拟分析，探索通风系统的优化控制策略。...
2020-09-30 09:14:00浏览：80
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CO selective methanation in hydrogen-rich gas mixtures over carbon nanotube supported Ru-based catal
Series of carbon nanotube supported Ru-based catalysts were prepared by impregnation method and applied successfully for complete removal of CO by CO selective methanation from H2-rich gas stream conducted in a fixed-bed quartz tubular reactor at ambient pressure.It was found that the metal promoter,reduction temperature and metal loading affected the catalytic properties significantly.The most excellent performance was presented by 30 wt％ Ru-Zr/CNTs catalyst reduced at 350 ℃.Since it decreased CO concentration to below 10 ppm from 12000 ppm by CO selective methanation at the temperature range of 180-240 ℃,and kept CO selectivity higher than 85％ at the temperature below 200 ℃.Characterization using XRD,TEM,H2-TPR and XPS suggests that Zr modification of Ru/CNTs results in the weakening of the interaction between Ru and CNTs,a higher Ru dispersion and the oxidization of surface Ru.Amorphous and high dispersed Ru particles with small size were obtained for 30 wt％ Ru-Zr/CNTs catalyst reduced at 350 ℃,leading to excellent catalytic performance in CO selective methanation....
2020-09-15 12:28:59浏览：83
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Partial Oxidation of Methane to Synthesis Gas over Hexaaluminates LaMAl11O19-δ catalysts
A series of M-substituted hexaaluminates LaMAl11O19-δ (M=Fe, Co, Ni, Mn, and Cu)were prepared and characterized by XRD, XPS, TPR and TGA techniques, respectively. They exhibited different reducibility and catalytic activity for partial oxidation of methane (POM) to synthesis gas. Among the LaMAl11O19-δ samples, LaNiAl11O19-δ showed the best catalytic activity for the topic reaction and selectivity for synthesis gas at 780 ℃ for 2 h. The conversion of CH4 was over 99.2%, and the product selectivity for both CO and H2 was above 90.3%....
2020-09-15 12:28:59浏览：77
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Gas-sensing properties of nanocomplex metal oxide
The development of CuO/CeO2 nanocomposites as the sensing material of semiconductor gas sensors is reported.CuO/CeO2 nanocomplex oxide is prepared by modified sol-gel method that uses copper nitrate, cerium nitrate and ethylene glycol as precursors. The optimized synthesis parameters and processing condition have been established. The particle size and distribution, phase morphology, specific surface, electronic states of atoms and gas sensing properties have been systematically characterized by Transmission Electron Microscope (TEM), Brunauer Emmett Teller (BET), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS) and gas sensitivity measurement. The results show that the sensor sensitivity depends on particle size, Cu/Ce cation ratio and calcination temperature. The effects of calcinations temperature and CuO loading on the gas sensitivity are also examined. The optimum calcination temperature and the CuO content for the highest sensitivity are 600 ℃ and 12%, respectively. The combination of excellent thermal stability.and tunable sensing properties through careful control of the processing parameters and selection of material composition gives rise to novel nanocomposites attractive to the sensitive and selective detection of a variety of toxic and combustible gases....
2020-09-13 23:35:02浏览：56
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