MOF-Templated Preparation of Highly Dispersed Co/Al2O3 Composite as the Photothermal Catalyst with High Solar-to-Fuel Efficiency for CO2 Methanation.,ACS Applied Materials & Interfaces

当前位置： X-MOL 学术 › ACS Appl. Mater. Interfaces › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

MOF-Templated Preparation of Highly Dispersed Co/Al2O3 Composite as the Photothermal Catalyst with High Solar-to-Fuel Efficiency for CO2 Methanation.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-08-07 , DOI: 10.1021/acsami.0c11576
Xi Chen _{1,

2} , Qiang Li _{1,

2} , Meng Zhang _{1,

2} , Juanjuan Li _{1,

2} , Songcai Cai _{1,

2} , Jing Chen _{2,

3} , Hongpeng Jia _{1,

2}

Affiliation

CH₄ production from CO₂ hydrogenation provides a clean approach to convert greenhouse gas CO₂ into chemical energy, but high energy consumption in this reaction still restrains its further application. Herein, we use a light-driven CO₂ methanation process instead of traditional thermocatalysis by an electrical heating mode, with the aim of greatly decreasing the energy consumption. Under UV–vis–IR light irradiation, the photothermal CO₂ methanation over highly dispersed Co nanoparticles supported on Al₂O₃ (Co/Al₂O₃) achieves impressive CH₄ production rates (as high as 6036 μmol g^–1 h^–1), good CH₄ selectivity (97.7%), and catalytic durability. The high light-harvesting property of the catalyst across the entire solar spectrum coupled with its strong adsorption capacity toward H₂, CO₂, CO, and abundant active sites are proposed to be responsible for the better photothermocatalytic performance of Co/Al₂O₃. Furthermore, a novel light-promotion effect is also revealed in CO₂ methanation, where UV–vis light irradiation induces oxygen vacancies and improves the proclivity toward adsorption of H₂, CO₂, and CO, finally resulting in a significant enhancement of the photothermocatalytic activity for CH₄ production. By concentrating the low-intensity light (120 mW/cm²) via a Fresnel lens, a photothermal CO₂ conversion efficiency of more than 50% with a good CH₄ selectivity (76%) is achieved on the optimal catalyst under a dynamic reaction system, which indicates the bright prospect of photothermal CO₂ methanation.

中文翻译：

MOF模板制备高分散度Co / Al2O3复合材料作为光热催化剂，具有高的燃料转化率，可用于CO2甲烷化。

由CO ₂氢化产生的CH ₄提供了一种将温室气体CO ₂转化为化学能的清洁方法，但是该反应中的高能耗仍然限制了其进一步的应用。在本文中，我们使用光驱动的CO ₂甲烷化工艺代替通过电加热模式进行的传统热催化，目的是大大降低能耗。在紫外可见光照射下，在Al ₂ O ₃（Co / Al ₂ O ₃）上负载的高度分散的Co纳米颗粒上进行光热CO ₂甲烷化可实现令人印象深刻的CH ₄生产率（高达6036μmolg）。^–1小时^–1），良好的CH ₄选择性（97.7％）和催化耐久性。提出了催化剂在整个太阳光谱中的高集光性能，以及对H ₂，CO ₂，CO的强大吸附能力以及丰富的活性位点，这有助于提高Co / Al ₂ O _3的光热催化性能。。此外，在CO ₂甲烷化中还揭示了一种新颖的光促进作用，其中紫外线可见光照射可引起氧空位并提高对H ₂，CO _2的吸附倾向。，以及CO，最终导致CH ₄生产的光热催化活性显着提高。通过菲涅耳透镜将低强度光（120 mW / cm ²）集中，在动态反应的最佳催化剂上，可实现超过50％的光热CO ₂转化效率和良好的CH ₄选择性（76％）。系统，表明光热CO ₂甲烷化的光明前景。

更新日期：2020-09-02

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南