Continuous CO2 Capture and Selective Hydrogenation to CO over Na-Promoted Pt Nanoparticles on Al2O3
Continuous CO2 Capture and Selective Hydrogenation to CO over Na-Promoted Pt Nanoparticles on Al2O3
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DOI：
10.1021/acscatal.1c05339
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发表时间：
2022-02-18
期刊：
影响因子：
12.9
通讯作者：
Shimizu, Ken-ichi
中科院分区：
文献类型：
--
作者：
Li, Lingcong;Miyazaki, Shinta;Shimizu, Ken-ichi
CO2的捕获及其用H-2还原以形成C1化合物（即，二氧化碳捕获和减少;利用双功能材料（DFM）的二氧化碳减排（CCR）（如CO和CH 4）作为一种有前途的CO2减排和利用方法最近引起了人们的关注。虽然从化学合成的角度来看，CO比CH 4更有用，但开发有效的DFM系统来产生CO的探索远少于CH 4产生。本研究成功地开发了Na促进的Pt纳米颗粒（NPs）负载在Al 2 O3上（Pt-Na/Al 2 O3）作为一种有效的DFM，通过从与O-2的混合物中捕获稀释的CO2并通过H-2连续还原来选择性地产生CO。开发的Pt-Na/Al 2 O3适用于使用两个反应器并联和切换进料气体的连续CCR操作。CO2捕集能力和CO产率可维持至少100 h。我们还通过显微镜和光谱表征阐明了碱性启动子的作用。Na修饰的Pt纳米颗粒（NPs）在Al 2 O3上形成，其中Na物种在有效的CO2捕获和选择性CO形成中起两个重要作用：（i）从与O-2的混合物中捕获CO2和（ii）抑制所产生的CO在Pt NPs上的吸附。
The capture of CO2 and its reduction with H-2 to form C1 compounds (i.e., CO2 capture and reduction; CCR), such as CO and CH4, using dual-functional materials (DFMs) has recently attracted attention as a promising process for CO2 emission reduction and utilization. Although CO is more useful than CH4 from a chemical synthesis perspective, the development of an effective DFM system to generate CO has been explored much less than that for CH4 generation. This study successfully developed Na-promoted Pt nanoparticles (NPs) supported on Al2O3 (Pt-Na/Al2O3) as an effective DFM for selective CO production by capturing diluted CO2 from a mixture with O-2 and successive reduction by H-2. The developed Pt-Na/Al2O3 was applicable for continuous CCR operation using two reactors in parallel and switching feed gases. The CO2 capture ability and productivity of CO were maintained for at least 100 h. We also elucidated the effect of basic promoters through microscopic and spectroscopic characterizations. The Na-modified Pt nanoparticles (NPs) were formed on Al2O3, where Na species play two important roles in efficient CO2 capture and selective CO formation: (i) capturing CO2 from a mixture with O-2 and (ii) inhibiting the adsorption of generated CO on Pt NPs.