不同方法制备K2MnAl11O19六铝酸盐催化剂及其甲烷的燃烧活性

介绍了共沉淀法和异丙醇盐水解法制备了六铝酸盐催化剂K2MnAl11O19,用XRD、BET、SEM和TG-DTA技术及甲烷燃烧活性对催化剂进行了表征和活性验证。结果表明,两种方法所制备的催化剂经1200℃焙烧4h后均可以形成完整的六铝酸盐晶型,同时都具有高的催化性能和高温稳定性,其中异丙醇盐水解法制备的K2MnAl11O19催化剂具有较高的比表面积和甲烷催化燃烧活性。     

Mercury transformation across particulate control devices in six power plants of China: The co-effect of chlorine and ash composition

This paper presents the results of field measurements on mercury speciation in six power plants of China by applying the Ontario hydro method. During the tests, flue gas was sampled simultaneously before and after particulate control devices (electrostatic precipitator and fabric filter baghouse) along with the pulverized coal, bottom ash and fly ash sampling. The amount of oxidized mercury in gas phase before and after ESP/FF suggests that mercury oxidation after combustion is a kinetically controlled process. The comparison of mercury speciation in different power plant indicates a clear relationship with coal type, especially the chlorine concentration and the basic ash compositions in coal. Both of the factors are analyzed quantitatively in this study. A new parameter C (ratio of chlorine in coal to base/acid ratio) has been introduced to evaluate the co-effect of the two factors above on mercury speciation.     

The role of castor oil in epoxy and polyamide systems for coating and adhesive application

Summary  Over the past few years, the challenges of globalisation, consolidation and economical point of view have meant that manufacturers of epoxy formulations have to constantly improve their capability to meet the needs of customers. An active area for advancement is that of epoxy and polyamide resin with castor oil. Generally, people working in the coating industries are familiar with castor oil, but this paper provides information on the new use of castor oil in epoxy and polyamide resin. This novel product (castor oil-modified epoxy resin/castor oil-modified polyamide) provides a previously unattainable combination and improved flexibility and toughness to a variety of ambient cure applications. This communication will review the performance of these castor oil-modified epoxy and polyamide resin surface coatings and adhesives. Based on the results of this study, these systems offer some advantages without much affecting the traditional properties of epoxy and polyamide resin in a variety of applications.     

Analysis of the Thermal Explosion in Systems Porous Reagent–Active Gas–Solid Product

The specific features of dynamics of the thermal explosion in systems porous reagent–active gas–solid product under conditions where the heattransfer and masstransfer regions are separated from the ambient medium are considered. In addition to the competition of heat release and heat removal, the process of initiation of exothermal chemical interaction in these systems under normal pressures depends significantly on conditions of filtration transport of the gaseous reagent. The induction and postinduction periods of the thermal explosion are studied. The theoretical analysis of thermalexplosion issues is supplemented by an experimental study of the process for the porous titanium–nitrogen–titanium nitride system.     

动力煤散烧固硫技术研究与应用

通过试验在细粒度洗选精煤中加入适量催化剂、活化剂、固硫剂、解决洗精煤因粒度细在链条炉中直接燃用困难，烟气不能达标排放的难题，实现清洁燃用。     

补强剂和共混工艺对PA/PVC/NBR三元共混弹性体性能的影响

在选择三元共聚尼龙（PA）、聚氯乙烯（PVC）、丁腈橡胶（NBR）为主体材料，制备PA／PVC／NBR（10／30／60）三元共混弹性体的工作基础上，进一步探讨了填料品种和用量，共混温度，加料顺序等因素PA／PVC／NBR三元共混弹性体的影响。试验结果表明：在PA／PVC／NBR（10／30／60）共混体系中，补强型填料的补强效果优于非补强型的填料，6种填料补强效果依次是：快压出炭黑＞半补强炭黑＞白炭黑＞活性重质，CaCO3＞陶土＞滑石粉，快压出炭黑的适宜用量是20－50份。在制备PA／PVC／NBR三元共混物时，适宜的共混温度是122－140℃，并且采用二段法混工艺制得的共混物性能优于采用一段法共混工艺。     

预防输氧管道燃烧的措施

概述了输氧管道的燃烧机理，分析了产生燃料的原因及预防措施，并给出了相应的设计规范。     

Catalytic Combustion of Methane over Rare Earth Stannate Pyrochlore

Well-defined Ln₂Sn₂O₇ powders (Ln = La, Sm and Gd) with a phase-pure pyrochlore structure were synthesized by hydrothermal reaction. The catalytic activities of Ln₂Sn₂O₇ powders for methane combustion were measured. Methane oxidation started at 500 °C and increased with oxidation temperature. Catalytic methane combustion is strongly influenced by the presence of oxygen vacancies that form by breaking Sn–O lattice bonds as the temperature increases. Addition of manganese to the rare earth pyrochlores improved methane oxidation activity. Manganese-doped samarium stannate pyrochlore (Sm₂Sn_1.8Mn_0.2O₇) shows highest the catalytic activity. Light-off and complete oxidation temperatures were measured at about 400 and 650 °C, respectively.     

TGA－MS对煤燃烧时氯的析出特征的研究

ＴＧＡ－ＭＳ是研究煤在燃烧过程中氯及其它气体组分析出特征的有效方法。ＭＳ的结果表明，煤在燃烧时氯基本上是以ＨＣｌ的形式从煤中析出，其析出特征与煤中水分的析出有着密切关系，与ＣＯ２及ＳＯ２的析出也有一定的关系。英国煤和美国煤在燃烧时氯的析出特征基本相似，这也说明两国煤中氯的存在方式是相似的。ＭＳ谱图上的三个ＨＣｌ析出峰则说明至少有三种形式的氯存在于煤中。     

IIR/EPDM共混物的物理机械性能

研究了IIR／EPDM并用体系中共混比、硫磺硫化体系以对共混性能的影响。结果表明，IIR与EPDM相容性较好，而且可以达到共硫化；IIR。EPDM质量比为75／25时，共混物的物理机械性能和老化性能较好；用硫黄、低硫高促进剂和无硫硫化体系都得到性能良好的共混物，其中以前者硫化的共混物性能最为突出。