Platinum Group Metal Catalyst (RuOx, PtOx, and IrOx)-Decorated Ceria-Zirconia Solid Solution as High Active Oxygen Carriers for Solar Thermochemical CO2 Splitting,ACS Catalysis

当前位置： X-MOL 学术 › ACS Catal. › 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.)

Platinum Group Metal Catalyst (RuOx, PtOx, and IrOx)-Decorated Ceria-Zirconia Solid Solution as High Active Oxygen Carriers for Solar Thermochemical CO2 Splitting
ACS Catalysis ( IF 11.3 ) Pub Date : 2022-06-14 , DOI: 10.1021/acscatal.2c02044
Zhenpan Chen _{1,

2,

3} , Qingqing Jiang _{2,

4} , Hongyu An ₂ , Juan Zhang ₂ , Shuoqi Hao ₁ , Xinju Li ₁ , Lili Cai ₂ , Wenguang Yu ₂ , Kuiyi You _{1,

3} , Xuefeng Zhu ₂ , Can Li ₂

Affiliation

Ceria substituted with zirconium (Ce_1–xZr_xO₂) is a promising material in two-step thermochemical CO₂/H₂O splitting cycles due to its great oxygen storage capacity and potential fuel production. However, the Ce_1–xZr_xO₂ solid solution exhibits a relatively slower fuel release rate than cerium oxide alone. Herein, in order to improve the solar-to-fuel energy conversion efficiency, noble metal catalysts (RuO_x, PtO_x, and IrO_x) are used to boost the CO release rate of Ce_0.85Zr_0.15O₂ (CZ15)-based two-step thermochemical CO₂ splitting. Compared with intrinsic Ce_0.85Zr_0.15O₂, the maximal CO release rate can be increased by 35% after loading 0.4 atom % IrO_x as a catalyst on the surface of Ce_0.85Zr_0.15O₂. Interestingly, the initial CO release rate can be increased by three times when a small amount of IrO_x (1.0 atom %) is doped into the crystal structure of Ce_0.85Zr_0.15O₂ through a solution combustion method. This catalytic effect is ascribed to the increased mixed ionic and electric conductivity within the ceramic bulk and the enhanced chemical reaction rate at the gas–solid interface for iridium-decorated ceria-zirconia solid solution. Our work demonstrates that interface engineering and bulk modification through adding the selected catalyst can effectively enhance the CO₂ splitting rate of Ce_1–xZr_xO₂ oxygen carriers, which provides a promising strategy to promote the fuel release rates of other kinetics-restricted thermochemical CO₂/H₂O splitting cycles.

中文翻译：

铂族金属催化剂（RuOx、PtOx 和 IrOx）-修饰的氧化铈-氧化锆固溶体作为太阳能热化学 CO2 分解的高活性氧载体

锆取代的二氧化铈（Ce _{1– x} Zr _x O ₂ ）由于其巨大的储氧能力和潜在的燃料生产潜力，在两步热化学CO ₂ /H _{2 O 分解循环中是一种很有前途的材料。}然而，Ce _{1- x} Zr _x O ₂固溶体表现出比单独的氧化铈相对较慢的燃料释放速率。在此，为了提高太阳能到燃料的能量转换效率，使用贵金属催化剂（RuO _x、PtO _x和 IrO _x）来提高 Ce _0.85 Zr _0.15 O的 CO 释放率_基于2 (CZ15) 的两步热化学 CO ₂分解。与本征Ce _0.85 Zr _0.15 O _{2相比，在Ce}_0.85 Zr _0.15 O _{2表面负载0.4 atom % IrO}_x作为催化剂后，最大CO释放率可提高35% 。_{有趣的是，当在 Ce 0.85} Zr _0.15 O ₂的晶体结构中掺杂少量 IrO _{x (1.0 atom %) 时，初始 CO 释放速率可提高 3 倍。}通过溶液燃烧法。这种催化作用归因于陶瓷块内混合离子和电导率的增加以及铱修饰的二氧化锆-氧化锆固溶体气固界面处化学反应速率的提高。我们的工作表明，通过添加选定的催化剂进行界面工程和本体改性可以有效提高Ce _1-_x Zr _x O _{2氧载体的CO}₂分解速率，这为提高其他动力学限制的燃料释放速率提供了一种有前景的策略。热化学 CO ₂ /H ₂ O 分裂循环。

更新日期：2022-06-14

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11