排序方式: 共有50条查询结果,搜索用时 15 毫秒
21.
In this work,the use of sepiolite for the removal of carbon dioxide from a carbon diox- ide/methane mixture by a pressure swing adsorption(PSA)process has been researched.Adsorption equilibrium and kinetics have been measured in a fixed-bed,and the adsorption equilibrium parameters of carbon dioxide and methane on sepiolite have been obtained.A model based on the LDF approxima- tion has been employed to simulate the fixed-bed kinetics,using the Langmuir equation to describe the adsorption equilibrium isotherm.The functioning of a PSA cycle for separating carbon dioxide/methane mixtures using sepiolite as adsorbent has also been studied.The experimental results were compared with the ones predicted by the model adapted to a PSA system.Methane with purity higher than 97% can be obtained from feeds containing carbon dioxide with concentrations ranging from 34% to 56% with the proposed PSA cycle.These results suggest that sepiolite is an adsorbent with good properties for its employment in a PSA cycle for carbon dioxide removal from landfill gases. 相似文献
22.
V2O5/TiO2选择性催化还原脱除烟气中的NOx 总被引:6,自引:1,他引:5
氮氧化物(NOx)主要是煤等石化燃料燃烧时生成的,其主要成分一般为NO>90%,NO2<10%。NOx不仅是酸雨形成的主要原因,而且可与碳氢化物等反应形成光化学烟雾,因此,世界各国对燃煤电厂烟气,汽车尾气中的NOx含量制定了严格的排放标准,NOx的治理目前主要采用燃烧后烟气脱硝(Flue Gas Denitrification,缩写FGD)技术,其中选择性催化还原(Selective Catalytic Reduction,综写SCR)技术应用最广,已在欧、美、日等发达国家燃煤电厂中商业应用^[1]。国际上对SCR脱硝的催化反应机理,反应动力学,催化剂性能改进等进行了大量的研究,目前的研究仍很活跃^[2-8],而国内在这方面的研究仍处于起步阶段。本文旨在研究V2O5/TiO2选择性催化还原脱除烟气中的NOx,为该技术的工业应用提供实验依据。 相似文献
23.
Gas-Phase Synthesis of Ethyl tert-Butyl Ether (ETBE) on H-ZSM-5 Catalyst in Continuous Fixed-Bed and Fluidized-Bed Reactors 总被引:1,自引:0,他引:1
Ramón Alcántara Elena Alcántara Laureano Canoira María José Franco Ismael Martín Alberto Navarro 《Reaction Kinetics and Catalysis Letters》2000,69(2):239-246
The gas-phase synthesis of ETBE from ethanol and isobutene has been carried out over a H-ZSM-5 catalyst in two types of continuous-flow catalytic reactors, fixed-bed and fluidized-bed. We have studied the influence of temperature, molar ratio ethanol/isobutene and weight hourly space velocity on the yield of ETBE. 相似文献
25.
26.
选用Co/ZrO2催化剂,通过改变催化剂颗粒径,在积分固定床反应器上研究了内扩散行为对F-T合成反应过程的影响。以表观活化能、烯/烷比的变化等为依据,考察了内扩散行为对F-T合成反应历程、催化剂活性及产物选择性的影响。催化剂颗粒径不同,内扩散限制程度会发生相应变化。实验结果表明,不同程度的内扩散限制条件下,F-T合成反应历程会有较大差异。当反应开始后,颗粒内孔从"干"到"湿",不同粒径的催化剂颗粒上气态烯/烷比变化均呈"U"型趋势。在固定床反应器上,增加空速通常会有CH4选择性升高、气态烯/烷比略有增加的现象,这是由于内扩散限制未完全消除的缘故。 相似文献
27.
A series of acidic cation-exchange resins were used for the hydroarylation of resorcinol with styrene, in which resin D072 exhibited the excellent catalytic performance in this reaction with 99% conversion of styrene and 90% selectivity of 4-(1-phenylethyl)resorcinol. It was applied to the hydroarylation of various electron-rich arenes with styrenes, and the hydroarylated products were quantitatively obtained. This catalyst could be used for four consecutive runs with slight decrease in activity. The hydroarylation of resorcinol with styrene over resin D072 in a fixed bed was completed effectively with 94% selectivity and 99% conversion, and this green continuous process is potentially applicable to large-scale productions. 相似文献
28.
A methodology for hazard investigation based on the integration of a mathematical model approach into hazard and operability
analysis is presented. This approach is based on mathematical modelling of a process unit where both steady-state analysis,
including analysis of the steady states multiplicity and stability, and dynamic simulation are used. The dynamic simulation
serves for the investigation of consequences of failures of the main controlled parameters, i.e. inlet temperature, feed temperature
and feed composition. This simulation is also very useful for the determination of the influence of failure duration on the
reactor behaviour. On the other hand, the steady state simulation can predict the reactor behaviour in a wide range of failure
magnitude and determine the parametric zones, where shifting from one steady state to another one may occur. A fixed bed reactor
for methyl tertiary-butyl ether synthesis was chosen to identify potential hazard and operational problems of a real process.
Presented at the 34th International Conference of the Slovak Society of Chemical Engineering, Tatranské Matliare, 21–25 May
2007. 相似文献
29.
KINETICS OF SULFUR POISONING IN A FIXED BED FOR F-T SYNTHESIS OVER COMMERCIAL Fe-Cu-KCATALYST 下载免费PDF全文
IntroductionSulfurpoisoningofanironcatal}'stisoneofthemostseriousdcactivationproblemsincomn'crcialproductionofsubstitutingnaturalgasforcoalreportedb}'Bartholomc\\ofal.II1andAndersonofal.12I.Thecommercialco-precipitatedFo-Cu-Kcatal\'stpreparedb}'Instituteo… 相似文献
30.
LIU Zhao-Tie ZHOU Jing-LaiZHANG Zhi-Xin ZHANG Bi-JiangInstitute of Coal Chemistry Academia Sinica To whom correspondence should be addressed. 《天然气化学杂志》1995,(1)
In part I, we investigated some behavior of copper- potassium promoted iron catalyst for the synthesis of hydrocarbon from hydrogen and carbon monoxide, with particular attention to the influence of reaction temperature, operating pressure, space velocity, H2/CO ratio in feed gas and particle size of catalyst on CO conversion. In this part, more attention was paid to the whole product distribution, such as wax, oil, oxygenate and the composition of oil and oxygenate. It is seen that the operating conditions greatly affect the whole product distribution and its composition. 相似文献