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Acidic Hydrogen Enhanced Photocatalytic Reduction of CO2 on Planetary Surfaces
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-06-17 , DOI: 10.1021/acsearthspacechem.0c00039
Antonín Knížek 1, 2 , Petr Kubelík 1, 3 , Milan Bouša 1 , Martin Ferus 1 , Svatopluk Civiš 1
Affiliation  

The photocatalytic reduction of CO2 to CH4 is a chemical process that to some extent occurs on the surface of rocky planets. The effect of an acidic proton on the rate of the photocatalytic reduction of CO2 on mineral surfaces was explored through the addition of HCl to our reaction system. HCl serves a dual role: it is a H-donor (reactant) and creates a band gap in the case of siderite and kaolinite (modifies the chemical environment of the reaction). Of the tested minerals, Al2O3, ilmenite (FeTiO3), and one sample of soil containing fossilized remains of diatoms from the Soos Nature Reserve (Czech Republic) have shown significant activity in the methanogenesis process. Kaolinite, natural rutile, MgO, basalt, acidic and ferrous synthetic clays, the Nakhla meteorite, and two diatomaceous earth samples from the Soos Nature Reserve showed weak photocatalytic properties; the reaction was slower than that on, e.g., Al2O3. The newly recognized photocatalytic activity of some of these natural minerals and the effect of the acidic proton should be included in the atmospheric models of both our planet and exoplanets alike, as it may play a role in the estimation of methane production from CO2 in the presence of minerals on the planetary surface upon UV radiation.

中文翻译:

酸性氢增强行星表面CO 2的光催化还原

CO 2到CH 4的光催化还原是化学过程,在一定程度上发生在岩石行星的表面。通过向我们的反应系统中添加HCl,探索了酸性质子对矿物表面上CO 2的光催化还原速率的影响。HCl具有双重作用:它是一种H供体(反应物),在菱铁矿和高岭石的情况下会产生能带隙(改变反应的化学环境)。在测试的矿物中,Al 2 O 3,钛铁矿(FeTiO 3),其中一个含有Soos自然保护区(捷克共和国)硅藻化石残留物的土壤样本在甲烷生成过程中显示出显着活性。来自Soos自然保护区的高岭石,天然金红石,MgO,玄武岩,酸性和亚铁合成粘土,Nakhla陨石和两个硅藻土样品均显示出较弱的光催化性能。该反应比在例如Al 2 O 3上的反应慢。这些天然矿物质中的一些新近公认的光催化活性和酸性质子的作用应包括在我们星球和系外行星的大气模型中,因为它可能在估算CO 2产生的甲烷中起作用 在紫外线辐射下行星表面上存在矿物。
更新日期:2020-07-16
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