• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Urea-formaldehyde derived porous carbons for adsorption of CO2
【24h】

Urea-formaldehyde derived porous carbons for adsorption of CO2

机译：尿素 - 甲醛衍生的多孔碳，用于吸附二氧化碳

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The aim of the research work is to develop high nitrogen content carbon adsorbents with high textural and surface properties using as a precursor urea-formaldehyde resin and as a template mesoporous-zeolite (MCM-41) through a nanocasting technique. The material undergoes carbonization followed by physical activation under a CO _(2) atmosphere to generate different carbon structure adsorbents. Different characterization techniques such as XRD, SEM, TEM, FTIR, CHN, TKN, nitrogen sorption, TGA, TPD and XPS were used for thorough characterization of the samples. XRD and TEM reveal the development of nanostructured carbon adsorbents. CO _(2) adsorption on adsorbents was investigated between temperatures of 30 and 100 °C and concentrations of 5 to 12.5% in a dynamic fixed bed column to overcome a gap in the literature. The carbon sample prepared at 700 °C through the nanocasting technique shows high basicity and exhibited a high CO _(2) uptake of 0.84 mmol g ~(?1) with a nitrogen content of 17.18%. It shows higher values at a high adsorption temperature (100 °C) as compared to the literature, which fulfills the objective of this study. An adsorbent prepared at 800 °C shows the highest surface area (337.07 m ~(2) g ~(?1) ), but shows a lower adsorption capacity as compared to one prepared at 700 °C whose surface area was slightly lower (297.68 m ~(2) g ~(?1) ). This shows that besides textural and nitrogen content, adsorption capacity depends on nitrogen functionalities. The adsorbents exhibit stability and easy regenerability over four adsorption–desorption cycles with better selectivity for CO _(2) . This was also confirmed from the lower value of Q _(st) (kJ mol ~(?1) ). The CO _(2) adsorption kinetics follow a fractional order model with less than 5% error. The equilibrium adsorption data fitted the Freundlich isothermal model well, demonstrating the heterogeneous nature of the adsorbent surface. Thermodynamics suggests a spontaneous, feasible and exothermic process.
机译：研究工作的目的是使用作为前体尿素 - 甲醛树脂的高纹理和表面性能和通过纳米核技术的模板中染色沸石（MCM-41）来开发高氮含量碳吸附剂。该材料经历碳化，然后在CO _（2）气氛下的物理活化以产生不同的碳结构吸附剂。使用不同的表征技术，例如XRD，SEM，TEM，FTIR，CHN，TKN，氮吸附，TGA，TPD和XPS用于彻底表征样品。 XRD和TEM显示纳米结构碳吸附剂的发展。在动态固定床柱中在30至100℃的温度和5至12.5％的温度之间研究了对吸附剂的吸附，以克服文献中的间隙。通过纳米核化技术在700℃下制备的碳样品显示出高碱度，并且具有0.84mmol G〜（α1）的高CO _（2）摄取，氮含量为17.18％。与文献相比，它在高吸附温度（100℃）下显示出较高的值，其满足本研究的目的。在800℃下制备的吸附剂显示出最高的表面积（337.07m〜（2）G〜（α1）），但与在700℃下制备的一个制备的吸附容量相比，其表面积略低（297.68 m〜（2）g〜（？1））。这表明除纹理和氮含量之外，吸附能力取决于氮功能。吸附剂在四个吸附 - 解吸循环上表现出稳定性和易再生性，具有更好的CO_（2）的选择性。这也从Q _（ST）的较低值（KJ MOL〜（β1））确认。 CO _（2）吸附动力学遵循小于5％误差的分数阶模型。平衡吸附数据适用于Freundlich等温模型，展示了吸附表面的异质性质。热力学表明自发，可行和放热过程。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号