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Enhanced photocatalytic CO2 reduction to fuels through bireforming of methane over structured 3D MAX Ti3AlC2/TiO2 heterojunction in a monolith photoreactor
Journal of CO2 Utilization ( IF 7.7 ) Pub Date : 2020-01-22 , DOI: 10.1016/j.jcou.2020.01.009
Muhammad Tahir

Design and fabrication of three dimensional Ti3AlC2 MAX/TiO2 composite immobilized over monolithic support was obtained through sol-gel approach. With partial oxidation and incorporation of Ti3AlC2 essentially promotes light absorption, charge transfer and extends photo-induced charge carrier lifetime. The highest CO yield of 1566 μmol g-cat−1 was obtained over Ti3AlC2 MAX/TiO2, being 6.8 folds higher than pure TiO2 NPs. Performance of structured composite tested in methane steam reforming (MSR), methane dry reforming (MDR) and methane bi-reforming (MBR) reveals 1.2 and 1.6 folds higher activity in MBR than using MDR and MSR, respectively. Similarly, quantum yield in a monolith photoreactor was 3.5 folds higher than using a fixed-bed system. This divulges that MBR gave proficient oxidation and reduction reactions in electron-rich 3D MAX structure, whereas, monolith photoreactor provides larger photon-energy consumption with improved sorption process to boost production of CO and H2 with enhanced stability. Thus, this work demonstrated 3D Ti3AlC2 MAX/TiO2 a promising catalyst and monolith photoreactor an efficient photon flux harvesting system for boosting hydrogen rich syngas production.



中文翻译:

在整体式光反应器中,通过在结构化3D MAX Ti 3 AlC 2 / TiO 2异质结上对甲烷进行双重整,增强了将光催化CO 2还原为燃料的能力

通过溶胶-凝胶法获得了固定在整体载体上的三维Ti 3 AlC 2 MAX / TiO 2复合材料的设计与制造。通过部分氧化和Ti 3 AlC 2的掺入,基本上可以促进光吸收,电荷转移并延长光诱导的载流子寿命。在Ti 3 AlC 2 MAX / TiO 2上获得最高的CO产量1566μmolg-cat -1,比纯TiO 2高6.8倍NP。在甲烷蒸汽重整(MSR),甲烷干重整(MDR)和甲烷双重整(MBR)中测试的结构化复合材料的性能表明,MBR的活性分别比使用MDR和MSR高1.2倍和1.6倍。同样,整体式光反应器的量子产率比固定床系统高3.5倍。这揭示了MBR在富电子的3D MAX结构中给出了充分的氧化和还原反应,而整体式光反应器则提供了更大的光子能量消耗,同时具有改进的吸附过程,从而提高了CO和H 2的产生,并提高了稳定性。因此,这项工作证明了3D Ti 3 AlC 2 MAX / TiO 2 一种有前途的催化剂和整体式光反应器,一种有效的光子通量收集系统,可用于提高富氢合成气的产量。

更新日期:2020-01-23
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