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采用流动体系、管式反应器、气相色谱分析法对高浓度CO气体中微量CO_2气体的脱除进行了考察,筛选出了最佳脱除剂并肯定了它的寿命及各种因素的影响。实验结果表明,脱除剂的脱除能力与CO_2起始浓度成正比。CO_2起始浓度较高时,CD-Rcm-1是最佳脱除剂;CO_2起始浓度较低时,CD-Rem-4,CD-Rem-5是最佳脱除剂。脱除压力对脱除能力影响较大。再生次数对脱除能力影响不显著。活化或再生的温度不低于300℃时,对CD-Rem_4和CD-Rem-5的脱除能力影响甚小。 相似文献
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CO2/H2和(CO/CO2)+H2低压合成甲醇催化过程的本质 总被引:8,自引:0,他引:8
通过在Cu/ZnO/Al2O3催化剂上CO2+H2,CO+H2和(CO/CO2)+H2催化反应动力学研究对合成甲醇动力学和反应机理进行了细致分析,提出合成甲醇的反应机理,解释了在(CO/CO2)+H2合成甲醇过程中少量CO2的作用及合成甲醇的直接碳源。 相似文献
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《Fluid Phase Equilibria》1988,39(1):101-110
Bubble-point pressures of the H2COCO2 system were measured at temperatures from 253.15 to 303.15 K and pressures up to 9 MPa. Multiple bubble-points were observed within certain limits of hydrogen compositions. The data have been compared with the calculated results by the Redlich-Kwong and the Peng-Robinson equations of state. 相似文献
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H2—CO,N2和CO2在液体石蜡烃中的溶解度 总被引:3,自引:0,他引:3
用高压搅拌釜装置,在压力0.05—4.5MPa,温度373—553K的实验范围内,测定了H_2、CO、N_2和CO_2在液体石蜡烃中的平衡溶解度,目的是为了提供设计浆态床Fischer-Tropsch合成反应器所需的基本数据。实验结果表明,H_2、CO、N_2和CO_2在液体石蜡烃中的溶解度是压力和温度的函数。H_2、CO、和N_2的平衡溶解度随着压力和温度的升高而增加,并与压力呈线性关系,而CO_2的平衡溶解度在较高的压力时稍偏离直线,并随温度的升高而减少,上述现象可用溶解熵来解释。将H_2、CO和CO_2实验结果与文献发表的数据进行了比较,比较结果说明二者是颇为接近的。实验测定的气体在液体石蜡烃中的平衡溶解度与压力和温度的关系可分别用下列各关联式表示,其计算值和实验值之间的平均误差均小于±6%。C_(eqH2)~*=106.12(P/T)exp(-883.37/T) [kmol(g)/m~3(1)]C_(eqco)~*=75.71(P/T)exp(-585.47/T) [kmol(g)/m~3(1)]C_(eqN2)~*=191.75(P/T)exp(-995.21/T) [kmol(g)/m~3(1)]C_(?)~*=38.88(P~0.904/T)exp(194.81/T) [kmol(g)/m~3(1)] 相似文献
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CO2吸附活化的研究进展 总被引:14,自引:0,他引:14
本文分析讨论了CO2 在金属催化剂和金属氧化物催化剂上吸附活化的机理及活化吸附态的反应性能, 提出了CO2 作为一种温和氧化剂在化工生产中加以综合利用的有效途径。 相似文献
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Ruilong YANG Diyu ZHANG Kangwei ZHU Huanlin ZHOU Xiaoqiu YE Aart W. KLEYN Yin HU Qiang HUANG 《物理化学学报》2019,35(3):292-298
Currently, worldwide attention is focused on controlling the continually increasing emissions of greenhouse gases, especially carbon dioxide. To this end, a number of investigations have been carried out to convert the carbon dioxide molecules into value-added chemicals. As carbon dioxide is thermodynamically stable, it is necessary to develop an efficient carbon dioxide utilization method for future scaled-up applications. Recently, several approaches, such as electrocatalysis, thermolysis, and non-thermal plasma, have been utilized to achieve carbon dioxide conversion. Among them, non-thermal plasma, which contains chemically active species such as high-energy electrons, ions, atoms, and excited gas molecules, has the potential to achieve high energy efficiency without catalysts near room temperature. Here, we used radio-frequency (RF) discharge plasma, which exhibits the non-thermal feature, to explore the decomposition behavior of carbon dioxide in non-thermal plasma. We studied the ionization and decomposition behaviors of CO2 and CO2-H2 mixtures in plasma at low gas pressure. The non-thermal plasma was realized by our custom-made inductively coupled RF plasma research system. The reaction products were analyzed by on-line quadrupole mass spectrometry (differentially pumped), while the plasma status was monitored using an in situ real-time optical emission spectrometer. Plasma parameters (such as the electron temperature and ion density), which can be tuned by utilizing different discharge conditions, played significant roles in the carbon dioxide dissociation process in non-thermal plasma. In this study, the conversion ratio and energy efficiency of pure carbon dioxide plasma were investigated at different values of power supply and gas flow. Subsequently, the effect of H2 on CO2 decomposition was studied with varying H2 contents. Results showed that the carbon dioxide molecules were rapidly ionized and partially decomposed into CO and oxygen in the RF field. With increasing RF power, the conversion ratio of carbon dioxide increased, while the energy efficiency decreased. A maximum conversion ratio of 77.6% was achieved. It was found that the addition of hydrogen could substantially reduce the time required to attain the equilibrium of the carbon dioxide decomposition reaction. With increasing H2 content, the conversion ratio of CO2 decreased initially and then increased. The ionization state of H2 and the consumption of oxygen owing to CO2 decomposition were the main reasons for the V-shape plot of the CO2 conversion ratio. In summary, this study investigates the influence of power supply, feed gas flow, and added hydrogen gas content, on the carbon dioxide decomposition behavior in non-thermal RF discharge plasma. 相似文献
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CO加氢反应机理一直是许多化学工作者感兴趣的课题.Rh催化剂因其优良的性能而被用于 CO加氢机理研 相似文献
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CO2加氢合成甲醇催化反应中CO的作用 总被引:1,自引:0,他引:1
研究了铜基催化剂上CO2加氢合成甲醇反应中掺人CO的作用,结果表明,在原料中添加少量CO,甲醇的选择性提高38%,收率提高25%;TPD-MS和TPSR-MS结果表明,CO能抑制催化剂表面起逆水汽变换作用的活性位对CO2的吸附,从而提高了CO2加氢合成甲醇的选抒性. 相似文献
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用CO作为探针研究CeO。的表面性质,以及研究CO和CO。与CeO。的相互作用,已有不少报导[‘-’1.Br。ysse等人发现CO在CeO。上的吸附,总伴随着催化剂的还原和COZ的生成;CO。在CeO。上的吸附不总是可逆的,CO。的存在会降低其对CO的催化氧化活性,对反应有抑制的影响,甚至会使表面中毒问.也有报导在CO或COZ气氛下,有证据表明CeO。有不利干活性的碳酸盐物种形成;反应中生成的C()。也可能吸附在表面上形成稳定的碳酸盐,从而抑制反应的继续进行k‘].*0。对O;-O-()催化剂在催化氧化以)中的影响报导比较少问.… 相似文献
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H CH_2CO反应机理的G2计算 总被引:1,自引:0,他引:1
分别在UQCISD/6-311G(d,p)和G2理论计算水平上,对CH2CO和H反应可能存在的四条反应通道进行了研究,详细分析了每个通道的反应机理;通过振动分析的虚频数和内禀反应坐标(IRC)计算,确认了反应涉及的每一个过渡态.通过反应位能剖面的比较,发现经过一个中间体生成CH3 CO的一条途径是主反应通道,该通道是个放热反应,总焓变为-146.07kJ·mol-1,速控步骤的位垒为55.09kJ·mol-1.理论计算结果较好地解释了实验观察到的主要产物和副产物并存的现象. 相似文献