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HDS型高效耐硫脱氧剂的研究 总被引:6,自引:2,他引:4
本文叙述了所开发的相系HDS型高效耐硫脱氧剂的各种性能。对普氮、普氢、氩气等不同气
源(氧含量0.1%~0.5%)的脱氧试验表明:在空速:2 000~30 000 h-1、压力:常压~1.2 MPa、温度:298~473 K的条件下,尾气中残氧量小于0.3×10-6(V)。对含硫含氢气源,可脱氧至0.1 ppm(V)。对不含氢的气源脱氧,氧容量可达84 mL·g-1,1000余小时的长期运转表明该脱氧剂具有良好的耐硫和热稳定性能,且成本低廉可广泛地用于化学工业和其它工业领域。 相似文献
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研究了改性活性炭(7%碳酸钠溶液浸渍)吸附硫化氢(H2S)气体的影响因素.利用改性后的活性炭考察氧含量、反应温度、空速等对活性炭吸附硫化氢的影响.结果表明,在反应条件下低氧含量时活性炭的吸附容量随氧含量增加而增加,但氧含量增加到3.5%后,氧含量对吸附容量的影响越来越小;在20~70℃范围内物理吸附发生主要作用,70~95℃化学吸附占主导作用,随着温度的增加,物理吸附逐渐向化学吸附转化,所以吸附容量先减小后增大;随着空速的增加,改性炭的吸附容量减小;改性后活性炭吸附H2S适宜的操作条件为氧含量2%,温度95℃,空速1000~2000 h-1. 相似文献
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Ni-Mo/Al2O3加氢脱氧催化剂的研究 总被引:2,自引:0,他引:2
在连续流动固定床微型反应器内,反应温度240~320℃,氢油比700,液体空速1.5 h-1,压力4.0MPa的条件下,详细考察了Mo-Ni/Al2O3系列催化剂对模型含氧化合物醇和酸的加氢脱氧反应性能.结果表明Mo-Ni/Al2O3催化剂对醇和酸具有高的加氢脱氧活性.其中Mo16Ni6/Al2O3催化剂在280℃时,乙醇、乙酸和丙酸加氢脱氧转化率分别为94.3%、94.9%和98.8%.钼助剂的加入显著地提高Ni基催化剂的加氢脱氧活性,大大地降低了氧化态Ni的还原温度,因为钼助剂的加入抑制了NiO与Al2O3强的相互作用,结果显著地降低了氧化态催化剂中的NiAl2O4相的量,增加了的NiO的量. 相似文献
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在固定床加氢微反装置上,采用硫化态Ni Mo W/Al2O3催化剂,以廊乡林业局轻质木焦油(300℃馏分)为原料考察反应条件对加氢脱氧性能的影响。结果表明,适当降低反应空速、提高反应压力、提高反应温度均有利于提高催化剂加氢脱氧反应活性,提高加氢产物的热值。在反应温度380℃、反应压力8.0MPa、体积空速0.8h-1、氢/油体积比800∶1的条件下,加氢生成油的氧含量明显降低,热值显著提高。轻质馏分油可作为化工轻油原料进行下游加工,中质馏分油主要技术指标均符合船用馏分燃料油(GB/T17411-1998)标准要求,可直接作为船用燃料油调和组分使用。 相似文献
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Pd-Cu/La_(0.5)Pb_(0.5)MnO_3上氧化羰基化合成碳酸二苯酯 总被引:3,自引:1,他引:3
针对氧化羰基化合成碳酸二苯酯反应过程在低氧浓度下催化剂活性低的特点,研制出一种高效负载型双金属催化剂Pd-Cu/La0.5Pb0.5MnO3,并采用向反应体系中连续通入CO、O2的混合气体对苯酚氧化羰基化合成碳酸二苯酯(DPC)。实验表明,Pd-Cu/La0.5Pb0.5MnO3催化剂适宜的n(Cu)∶n(Pd)=1∶1,在苯酚50 g,催化剂1.0 g,通氧速度15 mL/min,CO进料速度285 mL/min,反应压力1.0 MPa,反应温度80℃条件下,反应5 h时,DPC产率达16.4%。 相似文献
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研究了负载于γ-A l2O3上的Fe、Co、N i与Mo形成的双组分过渡金属氧化物上CO对SO2催化还原。考察了不同组分配比、不同反应温度、不同反应物配比以及不同空速下的活性。结果表明,双组分Fe系过渡金属氧化物对CO还原SO2反应具有很好的催化活性,催化活性顺序为CoMoγ/-A l2O3>FeMoγ/-A l2O3>N iMoγ/-A l2O3。配比为w(Co)=15%,w(Mo)=5%时活性最佳,在反应气体配比为m(CO)∶m(SO2)=2∶1,空速为3600mL/(h.g),温度在400℃时,SO2转化率达到最大值74.8%。 相似文献
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极限电流型氧传感器的实验研究 总被引:3,自引:0,他引:3
本实验用8mol%Y_2O_3-ZrO_2固体电解质制成了极限电流型氧传感器,并测定了氧在0.23~28.70mol%,温度在550~800℃范围时,传感器的输出特性,观察到该传感器有较好的稳定性和电压电流特性曲线。实验验证了极限电流值与氧摩尔分数和温度的关系。 相似文献
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油田注水除氧剂的研究进展 总被引:1,自引:0,他引:1
水中溶解氧的存在对油田注水系统的腐蚀影响是非常巨大的,文章介绍了油田注水除氧技术的研究进展情况,对各种除氧方法,包括物理除氧与化学除氧方法的优缺点进行了分析,从除氧效果的理论与实验所需用量,毒性,腐蚀性,贮存的稳定性以及运行的标准与成本等方面提出了较优的除氧剂分别运用于陆上油田和海上油田的注水除氧。 相似文献
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To test the validity of the method of stacked hydrogel contact lenses to obtain the oxygen permeability and transmissibility coefficients of the lenses, the coefficients of one low hydration (38% water) and two high hydration (55 and 58% water) hydrogel contact lenses stacked one to five on an oxygen electrode were determined. From the oxygen diffusion through the lenses, the current intensity in the stationary state was determined, and from this the “instrument” the oxygen transmissibility was obtained. The permeability coefficients of the lenses, corrected for edge effects, were obtained from the slope of the plot of the reciprocal of the transmissibility coefficients versus the lens thicknesses. The oxygen permeability and transmissibility coefficients of the lenses obtained neglected the boundary layers resistance between the stacked lenses and, therefore, these are not the “true” coefficients. This article compares the “apparent” oxygen permeability coefficients of the hydrogel contact lenses, obtained by others, with the “true” oxygen permeability coefficients obtained with a corrected equation that takes into account the boundary layers between the stacked lenses. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 321–327, 1999 相似文献
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掺杂SrTiO3体系上甲烷氧化偶联催化性能的研究 总被引:3,自引:0,他引:3
用X-射线粉末衍射(XRD)、氧吸附—程序升温脱附(O2-TPD)研究了柠檬酸热分解法制备的钙钛矿型催化剂的组成、结构与甲烷氧化偶联反应(OCM)催化性能,结果表明钙钛矿型SrTi0.9M0.1O3-δ(M=Mg,Al,Zr)的B位掺杂离子的价态越低,脱附温度越高,这与催化剂对生成C2产物的选择性相关联;钙钛矿型SrTi1-x,MgαO3-δ的B位Mg^2 掺杂量越多,催化剂中的氧空位越多,脱附温度升高。当B位Mg^2 掺杂量x≤0.1时,催化剂的甲烷转化率和C2选择性明显增加,当x≥0.1时又明显下降。认为低价离子掺杂所产生氧空位为氧分子的活化提供了活性位,表面吸附态氧物种为OCM反应主要活性氧物种,较高温度脱附的吸附氧有利于甲烷氧化偶联C2选择性的提高。 相似文献
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根据油田注水除氧剂的作用机理及海上注水系统的技术要求,开发了除氧剂BHO-04并在曹妃甸油田WHPD和FPSO现场试验中获得成功,能将缓冲罐出口的溶解氧控制在0.01 mg/L以内。目前,除氧剂BHO-04已经完全替代进口除氧剂IRU-145CH,成功实现国产化。 相似文献
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Selection of oxygen permeation models for different mixed ionic‐electronic conducting membranes
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Yue Zhu Wenping Li Yan Liu Xuefeng Zhu Weishen Yang 《American Institute of Chemical Engineers》2017,63(9):4043-4053
Permeation data of several mixed ionic‐electronic conducting (MIEC) membranes were analyzed by two oxygen permeation models (i.e., Zhu's model and Xu–Thomson's model), respectively, to find a concise method to guide the choice of permeation models. We found that Zhu's model can well fit the permeation data of perovskite‐type membranes, like Ba0.5Sr0.5Co0.8Fe0.2O3‐δ (BSCF) and BaCe0.05Fe0.95O3‐δ (BCF), and dual‐phase membranes, like 75 wt % Ce0.85Sm0.15O1.925–25 wt % Sm0.6Sr0.4Al0.3Fe0.7O3‐δ (SDC‐SSAF), whose oxygen vacancy concentrations are almost independent of the oxygen partial pressure at elevated temperatures. However, Zhu's model was not appropriate for membranes whose oxygen vacancy concentration changed obviously with oxygen partial pressure at elevated temperatures, such as La0.6Sr0.4Co0.2Fe0.8O3‐δ (LSCF) and La0.7Sr0.3CoO3‐δ (LSC). On the contrary, Xu–Thomson's model can fit the data of LSCF and LSC well, but it is inapplicable for BSCF, BCF, and SDC‐SSAF. Therefore, the dependence of oxygen vacancy concentration on oxygen partial pressure was suggested as an index for the selection of the permeation models. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4043–4053, 2017 相似文献
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S. K. Tiwari J. F. Koenig G. Poillerat P. Chartier R. N. Singh 《Journal of Applied Electrochemistry》1997,28(1):114-119
A kinetic study of the electroformation and electroreduction of oxygen in KOH solutions has been carried out on a LaNiO3 electrode obtained through a malic acid precursor route. The new electrocatalyst was found to show greatly enhanced activity for both oxygen evolution and reduction. The apparent electrocatalytic activity of this electrode for oxygen reduction was more than 10 times higher than those reported for similar electrodes obtained by other methods. It was, however, observed to be less active electrocatalytically for oxygen evolution as compared to the active LaNiO3 electrode obtained by the Bockris–Otagawa coprecipitation method. The electrochemical reaction order with respect to OH– concentration was found to be approximately 1 in the case of oxygen evolution while that for oxygen reduction, was approximately –1. The Tafel slope values for the reactions were 2.3RT/F and 2×2.3RT/3F, respectively. 相似文献