• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Evaluation of titanium dioxide for the adsorption and reactivity of the sulfur mustard simulant 2-chloroethyl ethyl sulfide.
【24h】

Evaluation of titanium dioxide for the adsorption and reactivity of the sulfur mustard simulant 2-chloroethyl ethyl sulfide.

机译：评价二氧化钛对硫芥子油模拟物2-氯乙基乙基硫化物的吸附和反应性。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This thesis reports the investigation of the degradation of the sulfur mustard simulant 2-chloroethyl ethyl sulfide (CEES) over the metal oxide TiO2. The ultimate goal is the development of catalytic adsorbent materials that more effectively decontaminate surfaces at ambient conditions once they have been exposed to chemical warfare agents (CWAs) such as sulfur mustard (HD). TiO2 is an appealing candidate for this application because of its reported use in photocatalysis and pollution control under ambient conditions. For this reason, the interactions of CEES on commercially available polycrystalline Evonik-Degussa AeroxideRTM P25 and amorphous NanoActive(TM) TiO2 were investigated. Each commercial sample was analyzed under two thermal pre-activation schemes: oxidized (200 torr O2 at 400°C for 2 hrs) or reduced (200 torr H2 at 400°C for 2 hrs).;The thermal pre-activation procedure was found to induce changes in the morphological and crystalline properties of NanoActive (NA) while the P25 remained unchanged. The magnitude of these changes was similar for either oxidation or reduction. Pre-activation of the amorphous NA yielded anatase crystallites with mean diameter of 10 nm. This crystallite formation was accompanied by a decrease in surface area and pore volume by 80% and 17%, respectively. Infrared analysis revealed chemical activity at temperatures well above ambient (> 200°C) and is further confirmed by preliminary differential scanning calorimetry data. Long term (40 days) ambient reactivity investigations showed no reactivity for P25 stored at ambient temperature and light conditions. The influence of moisture conditioning was also investigated at two levels: below 10% RH and at 50% RH. Changes in this variable did not alter the reactivity of P25.;While these samples exhibit very different responses to the thermal pre-activation procedure, these resulting surfaces do not show any improvement in reactivity when compared to the original sample. Since no chemical activity is observed until temperatures exceeding 200°C, it is concluded that neither P25 nor NA are desirable as catalytic adsorbents for CWA decontamination at ambient conditions.
机译：本论文报道了在金属氧化物TiO2上降解硫芥子油模拟剂2-氯乙基乙基硫（CEES）的研究。最终目标是开发催化吸附剂材料，一旦将其暴露于化学战剂（CWA）（例如硫芥子（HD）），便可以在环境条件下更有效地净化表面。 TiO 2是该应用的吸引人的候选物，因为据报道其在环境条件下用于光催化和污染控制中。因此，研究了CEES在市售多晶Evonik-Degussa AeroxideRTM P25和无定形NanoActiveTM TiO2上的相互作用。在两种热预活化方案下对每种商业样品进行了分析：氧化（在400°C下200托O2氧化2小时）或还原（在400°C下200托H2氧化2小时）;;发现了热预活化程序诱导纳米活性物质（NA）的形态和晶体性质发生变化，而P25保持不变。对于氧化或还原，这些变化的幅度相似。非晶态NA的预活化产生平均直径为10 nm的锐钛矿微晶。这种微晶形成伴随着表面积和孔体积的减少分别为80％和17％。红外分析显示在远高于环境温度（> 200°C）的温度下具有化学活性，初步的差示扫描量热法数据进一步证实了该化学活性。长期（40天）环境反应性研究表明，在环境温度和光照条件下，P25没有反应性。还研究了湿度调节的两个水平：相对湿度10％以下和相对湿度50％。该变量的变化不会改变P25的反应性。虽然这些样品对热预活化程序的反应非常不同，但与原始样品相比，这些所得表面并未显示出任何反应性改善。由于直到温度超过200℃都没有观察到化学活性，因此可以得出结论，在环境条件下，P25和NA都不是用于CWA净化的催化吸附剂。

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