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用废弃的半焦焦粉制活性炭工业性试验研究 总被引:5,自引:0,他引:5
介绍了用神府矿区废弃焦粉制活性炭的工业性试验条件、技术路线、配比方案、产品性质及经济效益分析情况.讨论了工艺条件对活性炭质量及加工过程的影响,比较分析了不同配比活性炭性质的异同及其孔结构特征,对焦粉制活性炭的成本及经济效益进行了评估.认为用半焦焦粉制活性炭技术上可行,经济上有较强的竞争力. 相似文献
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以入侵生物空心莲子草为原料,以K2CO3为活化剂,经一步共混活化法制备活性炭。研究了K2CO3与空心莲子草质量比、活化温度及活化时间对活性炭得率及吸附性能的影响。利用扫描电子显微镜(SEM)对不同温度下得到的活性炭进行了表面形貌观察。实验结果表明,K2CO3活化空心莲子草的最佳活化条件为:质量比为1.5,活化温度及时间分别为800℃,3.0 h,此时活性炭得率为13.79%,其碘吸附值及亚甲基蓝吸附值分别为1477 mg·g-1和384 mg·g-1。当氮气流量在20~100 ml·min-1范围内变化时,K2CO3的回收率相差不大,且其回收率均能达到80%以上。SEM结果表明活化温度对活性炭孔结构具有明显影响。 相似文献
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超级电容器是一种新型储能装置,具有充电时间短、寿命长、绿色环保等特点。石油焦基活性炭是超级电容器常用的电极材料,它的研究发展制约着电容器性能的进一步提高。简述了活性炭电极在超级电容器中的应用,并重点介绍了石油焦基活性炭电极的研究进展。 相似文献
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Supported K2CO3/Co–MoS2 on activated carbon was prepared by a co-impregnation technique and has been characterized by X-ray diffraction (XRD) and BET. Active ingredients ranged from 39 to 66% and included molysulfide and cobalt sulfide. XRD analysis indicates that cobalt and molybdenum sulfides are found in the Co3S4 and Co9S8 phases. These catalysts were performance tested in a fixed-bed reactor under higher alcohol synthesis conditions, 2000–2400 psig and 270–330°C. Active chemicals on the carbon extrudates decreased the surface area dramatically, as measured by BET. Surprisingly, at the high level of active chemicals, alcohol productivity and selectivity were decreased. An increase in the reaction temperature led to a decrease in the selectivity of methanol and an increase in selectivity of hydrocarbons. Total alcohol productivity was also increased as gas hourly space velocity (GHSV) was increased. Co9S8 may play a role in the catalyst aging process. In prolonged reaction periods (140 h), sulfur is lost from the surface, possibly as H2S. The quantity of Co9S8 on the surface appears to increase as the catalyst ages. 相似文献
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CaCO3脱硫剂对SO2的化学反应活性直接影响其烟气脱硫效率和脱硫剂的利用率.提高CaCO3的脱硫反应活性,对降低烟气脱硫生产成本具有重要的意义.在高1.1 m、内径12.5 cm的流化床反应器内的半干法烟气脱硫过程中,利用CO2气体为活化介质对CaCO3脱硫剂浆液进行活化处理,并以活化后的CaCO3为脱硫剂,实验研究了CO2活化对CaCO3脱硫剂烟气脱硫效率的影响.结果表明,CO2气体对CaCO3的活化处理,增大了CaCO3在溶液中的溶解度,提高了CaCO3与SO2间反应的活性,促进了CaCO3脱硫剂烟气脱硫效率的显著提高.在实验条件下,当饱和接近度为15~18 K、钙硫比为1.2、脱硫剂粒径为64 μm时,经CO2气体活化后的CaCO3脱硫剂其脱硫效率达到92%,接近于相同条件下Ca(OH)2的脱硫效率.该研究结果为提高CaCO3脱硫剂的烟气脱硫反应活性,提供了一种新的工艺技术方法. 相似文献
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二氧化碳浸蚀后的焦炭微观结构研究 总被引:1,自引:0,他引:1
研究了与二氧化碳反应前后的单种煤所炼焦炭和工业用焦炭的气孔结构和光学组织的变化规律,结果表明:经二氧化碳浸蚀后焦炭的气孔率都增加,气孔壁减薄,气孔平均直径增大;不同种类的焦炭,浸蚀的温度和时间不同时,其气孔结构的参数变化程度也有所不同。无论是单种煤所炼焦炭还是工业用焦炭,受二氧化碳浸蚀后,其各向同性、丝炭和破片组织含量减少;而粗粒镶嵌、纤维状和片状组织含量增多;OTI指数增大。 相似文献
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CO2 Adsorption Kinetics of K2CO3/Activated Carbon for Low‐Concentration CO2 Removal from Confined Spaces
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K2CO3 supported on activated carbon (K2CO3/AC) is a promising means to remove low‐concentration CO2 from confined spaces. In this removal process, physical adsorption plays an important role but it is difficult to quantify the amount of CO2 adsorbed when both H2O and CO2 are present. The linear driving force mass transfer model is adopted to study the CO2 adsorption kinetic characteristics of K2CO3/AC by analyzing the experimental data. The effect of K2CO3 and H2O on the adsorption of CO2 in K2CO3/AC was also evaluated. K2CO3 loaded on the support is found to increase the mass transfer resistance but decrease the activation energy required for the physical adsorption process. The presence of water vapor is disadvantageous to achieve high physical adsorption capacity since it enhances the chemical sorption in the competitive dynamic sorption process. 相似文献
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《化学试剂》2015,(9)
以活性炭(AC)为模板剂通过浸渍法引入铈源,通过高温焙烧制得纳米Ce O2催化剂。在催化二氧化碳和甲醇直接合成碳酸二甲酯(DMC)的反应中,该催化剂表现出优越的催化活性,当Ce O2与活性炭的物质的量比为3∶7(Ce O2/AC≈0.43)时,碳酸二甲酯收率最高,达到0.893 1 mmol/mmolcat。此外,通过X-射线衍射(XRD)、红外光谱(IR)、透射电镜(TEM)和程序升温吸附(TPD)对所制备的催化剂进行了表征。研究结果表明,焙烧过程中,催化剂前驱体中活性炭的去除过程能够有效地调节催化剂表面的酸碱位,适量的中强酸性位和中强碱性位是影响Ce O2催化活性的重要因素。 相似文献
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《分离科学与技术》2012,47(5):710-719
In this work, adsorption isotherms and adsorption kinetics of CO2 on zeolite 13X and activated carbon with high surface area (AC-h) were studied. The adsorption isotherms and kinetic curves of CO2 on the adsorbents were separately measured at 328 K, 318 K, 308 K, and 298 K and with a pressure range of 0–30 bar by means of the gravimetric adsorption method. The mass transfer constants and adsorption activation energy Ea of CO2 on the adsorbents were estimated separately. Results showed that at very low pressure the amounts adsorbed of CO2 on the zeolite 13X was higher than that on the AC-h, while at higher pressure, the amounts adsorbed of CO2 on the AC-h was higher than that on the zeolite 13X since the AC-h has a larger surface area and a larger total pore volume compared to the zeolite 13X. The adsorption kinetics of CO2 can be well described by the linear driving force (LDF) model. With the increase of temperature, the mass transfer constants of CO2 adsorption on both samples increased. The adsorption activation energy Ea for CO2 on the two adsorbents decreased with the increase of pressure. Furthermore, at low pressure the Ea for CO2 adsorption on the zeolite 13X was slightly lower than that on the AC-h, while at higher pressure the Ea for CO2 adsorption on the zeolite 13X was higher than that on the AC-h. 相似文献