新型催化剂上甲苯、丙烯、一氧化碳催化燃烧反应动力学

以甲苯、丙烯、一氧化碳为代表物研究了在金属壁与催化层一体化催化剂上的催化燃烧 ,假设吸附解离态的氧与吸附态的反应物反应建立了催化燃烧反应动力学模型 ,得到了甲苯、丙烯、一氧化碳混合物在空气中催化燃烧反应动力学方程 .     

“活性炭吸附+催化燃烧”工艺在VOCs治理中的联合应用研究

本文研究了“活性炭吸附+催化燃烧”工艺在挥发性有机化合物（VOCs）治理中的联合应用,以提高现代化工废气处理系统的效率和环保性能。首先,详细介绍了该工艺的基本原理,包括活性炭吸附、脱附和催化燃烧的机理,以及影响催化燃烧反应的主要因素。随后,阐述了活性炭废气处理系统的主要处理工序与原理,包括废气的捕集、多级过滤、活性炭吸附和催化燃烧等阶段。在活性炭吸附+催化燃烧系统方案中,系统通过多级过滤确保废气在进入设备前达到清洁无害的标准。活性炭在吸附阶段通过其巨大表面积和微孔结构有效吸附废气中的有机物,将其转化为对人体无害的气体。随着活性炭吸附的饱和,通过吹扫干热空气进行脱附再生,维持活性炭床的吸附能力。脱附后的废气进入催化燃烧装置,在催化剂的作用下高效氧化燃烧,将有机物完全分解为水和二氧化碳。系统设计中,燃烧产生的热量被用于加热活性炭吸附系统和预处理废气,提高整个系统的能源利用率。     

汽车喷漆废气VOCs处理技术应用进展探究

汽车喷漆废气含有大量的漆雾和VOCs有机废气,是造成大气污染的主要原因之一。通过分析有机废气处理技术,针对汽车喷漆废气中VOC组分复杂问题和喷漆室、烘干室有机废气特点,研究了预处理+沸石浓缩转轮吸附+催化燃烧、预处理+活性炭纤维吸附+脱附+催化燃烧、预处理+生物滴滤+生物过滤的处理工艺等三种技术,以期为喷漆废气污染治理提供参考。     

石化污水场含烃废气催化燃烧降解研究

为消除石化污水场所逸散的烃类等有机挥发物对环境的危害,提出了采用浓度调整-吸附脱硫-催化燃烧组合工艺技术处理经封闭后有组织排放的废气的新工艺:用活性炭对废气总烃浓度进行调整,用Fe2O3吸附脱硫,用蜂窝状Pt、Pd、Ce多组分催化剂对废气进行催化燃烧。在中试研究的基础上,建立了一套3000m3/h的有机废气催化燃烧工业装置。工业试验结果表明,此组合工艺有机废气脱除率在95%以上,处理后的排放气可达到国家废气排放标准。     

含氯挥发性有机物(Cl-VOCs)废气处理的研究进展

系统调研了Cl-VOCs废气处理的研究进展。分类介绍了Cl-VOCs废气的处理方法,如焚烧法、催化燃烧法、冷凝法、生物法、催化还原法、光化学氧化法、紫外光解法、吸收法和吸附法等;总结了不同吸附材料(活性炭、活性炭纤维、聚合物以及金属有机骨架材料)对Cl-VOCs废气的吸附性能;展望了吸附法在Cl-VOCs废气处理方面的发展前景以及研究高性能吸附材料的必要性。     

三苯废气净化处理装置

采用吸附浓缩一催化燃烧法治理彩印厂三苯有机废气、使废气排放浓度达到标准要求，解决了彩印行业三苯有机废气治理问题。     

微量有机化合物催化燃烧反应器数学模拟

建立了甲苯、二甲苯、环己烷催化燃烧反应器的一维拟均相数学模型 ,在MnCuOx/Al2 O3 催化剂上催化燃烧反应动力学采用Langmuir双曲型动力学方程。模拟计算了废气处理量、废气中有机化合物的浓度、床层入口温度对净化率的影响     

挥发性有机废气治理技术的现状与进展

介绍了近年来国内外挥发性有机废气治理技术的现状,如吸附技术、催化燃烧技术、生物技术等。探讨了挥发性有机废气处理技术的发展趋势。     

处理涂料施工废气用的SBS小型吸附装置

一、前言在涂料制造过程,尤其在它的施工过程中,要释放大量有机溶剂,危害人体健康和环境,因此急待治理。目前,废气净化方法很多,如直接燃烧、催化燃烧、活性碳吸附等。但权衡其利弊,燃烧虽有优点,但也有一些缺点,如大风量、低浓度的废气不能完全燃烧,间歇作业中余热不能充分利用,燃烧需大量能源以及不完全燃烧产生二次污染等。理想的废气处理方法应该是:废气→燃烧(直接燃烧800～1200℃,催化燃烧500-550℃)→活性碳(活性碳纤维)     

有机废气处理技术机理及研究进展

简要介绍了近年来国内外有机废气治理技术的研究现状,如生物处理技术、吸附处理技术、催化燃烧技术等。深入探讨了有机废气处理技术的特点与发展趋势。     

生物滴滤塔处理甲苯工艺过程的影响因素研究

采用陶粒为填料的生物滴滤塔降解甲苯,实验研究了浓度和气、液体流量对甲苯降解能力的影响,实验结果表明,随着气、液体流量的增大,净化效率降低。对影响气体进出口温差的因素和填料床内液膜温度分布的结果进行实测和分析发现：进口甲苯浓度和液体流量、气体进出口温差成正比,而与气体流量成反比。液膜在填料床内的温度分布是沿塔高先降低后升高。     

Catalytic combustion of toluene on Cu-Mn/MCM-41 catalysts: Influence of calcination temperature and operating conditions on the catalytic activity

Catalytic combustion of toluene on Cu-Mn/MCM-41 catalyst was performed in tubular flow reactor operated at atmospheric pressure. The effect of catalyst pre-treatment temperatures on the catalytic activity and stability was investigated. Some reaction variables, such as inlet concentration of toluene and oxygen, reaction temperatures and space velocities were varied over wide ranges, and the influence of different reaction conditions on toluene conversion was discussed. It is showed that the catalytic activity was significantly affected by calcination temperatures between 300 and 800 °C, and oxygen concentration, toluene concentration and space velocity are all key experimental factors to optimize the toluene combustion activities. The objective of this study was to investigate catalytic properties of Cu-Mn/MCM-41 catalysts prepared at different calcination temperatures, in order to obtain additional information to prepare an efficient and highly active catalyst at low temperature.     

丙烯腈装置尾气催化燃烧本征动力学

消除内外扩散影响后, 在微型固定床积分反应器中开展了国产HPA型负载贵金属催化剂上一氧化碳、丙烯和丙烷单组分及其三组分混合物催化燃烧的实验研究。采用程序升温脱附（TPD）手段考察了反应物在催化剂上的吸附脱附情况, 据此推测可能的反应机理, 建立了单组分催化燃烧的Eley-Rideal速率模型。运用最小二乘估计和单纯形优化搜索方法对模型参数进行了估值, 反应物转化率的模型计算值与实验值吻合良好。同时, 将所得单组分动力学模型叠加用于预测多组分催化燃烧时, 转化率的计算值与多组分实验结果相容。     

陶瓷球填料生物滴滤塔降解甲苯废气

The Purification experiments of waste gas containing low concentration toluene were made in trickling biofilter with ceramic spheres. The effects of liquid flow rate,gas flow rate,pH of circulation liquid, and toluene concentration in inlet gas on the purification efficiency of trickling biofilter were investigated. The pressure drop of the trickling biofilter was also measured during experiments.Increasing liquid flow rate and gas flow rate resulted in the decrease of purification efficiency of trickling biofilter. The highest purification efficiency of trickling biofilter was found at the circulation liquid pH of 7. The porosity of the packing material at the inlet of gas was higher than that at the outlet of gas in biofilter after continuous operation in 50 days. The decrease in the porosity of packing material caused a great increase in the pressure drop of the biofilter.     

Effects of arc rotation speed on BTX decomposition by atmospheric pressure plasma

This study was conducted to investigate the decomposition of volatile organic compounds in air by the rotating arc plasma system. The rotating arc plasma decomposed benzene, toluene, and m-xylene (BTX) gases diluted in air. The effects of the gas flow rate and arc rotation speed on conversion rate and energy efficiency were evaluated by high speed images and Fourier transform infrared spectroscopy. Perfect conversions of toluene and m-xylene into environmentally benign species were achieved at the lowest waste gas flow rate of 20 L/min, while the conversion rate of benzene was 79% under the same operating conditions due to the highest chemical bond strength of benzene among BTX. Although the conversion rate decreased with increasing the gas flow rate, the energy efficiency had an optimal gas flow rate, which influenced arc rotation speed. In addition, the oxidation rates of BTX were examined based on analysis of carbon oxides generated under different operating conditions.     

ON THE EFFECTS OF SYNGAS COMPOSITION AND WATER-GAS-SHIFT REACTION RATE ON FT SYNTHESIS OVER IRON BASED CATALYST IN A SLURRY REACTOR

Water gas shift reaction plays an important role in the Fischer-Tropsch synthesis reaction over iron-based catalysts. A slurry reactor model which accounted for the kinetics of both Fischer-Tropsch synthesis and water gas shift reaction was used to investigate the effects of hydrogen to carbon monoxide ratio, water vapor concentration and reactor temperature on synthesis gas conversion. The model was used to determine optimum concentration of water in the feed gas. For a given reactor temperature, the optimum concentration of water in the feed gas was found to increase with decreasing hydrogen to carbon monoxide ratio. The optimum concentration of water in the feed gas was found to decrease with increasing reactor temperature. Increasing the water gas shift reaction rate improved syngas conversion for low reaction temperatures.     

Non-steady-state catalytic decontamination of waste gases

The non-steady-state behaviour of a fixed bed reactor controlled by periodical direction reversal of reactant feed, applied in catalytic oxidation of industrial waste gases, containing organic compounds and carbon monoxide, has been investigated. The effects of the type of oxidized compound, its initial feed concentration, linear gas velocity, inerts-to-catalyst ratio and inerts thermophysical characteristics on the formation of reactor concentration and temperature fields were elucidated. It was shown that autothermal reactor behaviour is guaranteed by concentrations of the oxidized component which ensure an adiabatic temperature increase in excess of 20 °C. Deviations of either flow rate or initial concentration of the oxidized compound do not disturb the operational stability.     

丙烯腈尾气流向变换催化燃烧的实验研究

在固定床反应器中利用HPA型催化剂进行了丙烯腈尾气流向变换催化燃烧实验。考察了在不同尾气组成、不同空速及不同换向周期下流向变换催化燃烧反应系统的热波特性、可燃物的转化率等特性。结果表明,在广泛的操作条件变化范围内,可燃物的转化率均能维持在96％以上,即使空速、气体组成在一定范围内短期波动,流向变换催化燃烧反应系统仍然能够维持正常操作,但在可燃物浓度较低且空速、换向周期与可燃物浓度匹配不合理时反应系统将熄火,浓度较高时将飞温。