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Dispersing TiO2 Nanoparticles on Graphite Carbon for an Enhanced Catalytic Oxidative Desulfurization Performance
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-09-21 , DOI: 10.1021/acs.iecr.0c03202 Suhang Xun 1 , Qiutong Ti 1 , Zhengxin Jiao 1 , Linlan Wu 2 , Minqiang He 2 , Linlin Chen 2 , Linhua Zhu 3 , Wenshuai Zhu 2 , Huaming Li 2
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-09-21 , DOI: 10.1021/acs.iecr.0c03202 Suhang Xun 1 , Qiutong Ti 1 , Zhengxin Jiao 1 , Linlan Wu 2 , Minqiang He 2 , Linlin Chen 2 , Linhua Zhu 3 , Wenshuai Zhu 2 , Huaming Li 2
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Metal oxide nanoparticles (NPs) have been regarded as highly active species for many catalytic processes but are being seriously hindered by their agglomeration property. In this work, graphite carbon (GC) is employed as a carrier for the dispersion and stabilization of TiO2 NPs to overcome the disadvantage. A series of supported catalysts TiO2/GC with different loading amounts of TiO2 are prepared and characterized in detail. It is discovered that TiO2 NPs are well dispersed on GC when the loading amount is 10%, which is confirmed by elemental mapping and transmission electron microscopy images. As expected, the supported 10%-TiO2/GC catalyst reveals outstanding catalytic activity in the oxidative removal of dibenzothiophene (DBT). A 100% desulfurization efficiency is obtained under mild reaction parameters. Meanwhile, the kinetic parameter investigation shows that the oxidation of DBT followed the pseudo-first-order kinetic model. In addition, the mechanism of the oxidative desulfurization system is studied carefully by free-radical scavenging experiments, electron spin resonance, Raman spectroscopy, and gas chromatography–mass spectrometry analysis. Moreover, the supported catalyst possesses excellent stability and recycling performance, and the removal of DBT remains to be >99% after five times of recycling.
中文翻译：
在石墨碳上分散TiO 2纳米颗粒以增强催化氧化脱硫性能
金属氧化物纳米粒子（NPs）已被视为许多催化过程中的高活性物种，但由于其团聚特性而受到严重阻碍。在这项工作中，采用石墨碳（GC）作为载体来分散和稳定TiO 2 NP，以克服上述缺点。一系列负载型催化剂的二氧化钛2 / GC有TiO的不同载量2的制备和表征的细节。发现当负载量为10％时，TiO 2 NPs在GC上分散良好，这已通过元素图谱和透射电子显微镜图像得到证实。如预期的那样，负载的10％-TiO 2/ GC催化剂在氧化去除二苯并噻吩（DBT）中显示出杰出的催化活性。在温和的反应参数下可获得100％的脱硫效率。同时，动力学参数研究表明DBT的氧化遵循伪一级动力学模型。此外，通过自由基清除实验，电子自旋共振，拉曼光谱和气相色谱-质谱分析，仔细研究了氧化脱硫系统的机理。此外，负载型催化剂具有优异的稳定性和再循环性能，并且经过五次再循环后，DBT的去除率保持在> 99％。
更新日期：2020-10-15
中文翻译：
在石墨碳上分散TiO 2纳米颗粒以增强催化氧化脱硫性能
金属氧化物纳米粒子（NPs）已被视为许多催化过程中的高活性物种，但由于其团聚特性而受到严重阻碍。在这项工作中，采用石墨碳（GC）作为载体来分散和稳定TiO 2 NP，以克服上述缺点。一系列负载型催化剂的二氧化钛2 / GC有TiO的不同载量2的制备和表征的细节。发现当负载量为10％时，TiO 2 NPs在GC上分散良好，这已通过元素图谱和透射电子显微镜图像得到证实。如预期的那样，负载的10％-TiO 2/ GC催化剂在氧化去除二苯并噻吩（DBT）中显示出杰出的催化活性。在温和的反应参数下可获得100％的脱硫效率。同时，动力学参数研究表明DBT的氧化遵循伪一级动力学模型。此外，通过自由基清除实验，电子自旋共振，拉曼光谱和气相色谱-质谱分析，仔细研究了氧化脱硫系统的机理。此外，负载型催化剂具有优异的稳定性和再循环性能，并且经过五次再循环后，DBT的去除率保持在> 99％。
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