Abstract

The decomposition of methane on molybdenum nanoparticles was studied experimentally at room temperature. The molybdenum nanoparticles were synthesized in the gas phase using UV laser photolysis of Mo(CO)₆ vapor in a flow reactor. The working part of the flow reactor was equipped with quartz windows for introducing the radiation from a pulsed Nd:YaG laser operating at the fourth harmonic (266 nm) at a frequency of 10 Hz. Methane was used as a carrier gas. As a result of irradiation of a mixture of methane with Mo(CO)₆ vapors in the gas phase at room temperature, nanoparticles with sizes of 2–50 nm were synthesized. The phase composition of the nanoparticles included pure molybdenum, molybdenum carbide Mo₂C, and molybdenum oxide MoO₃. During the reaction, the hydrogen yield was measured with a VG-7 highly sensitive hydrogen analyzer based on a semiconductor metal–dielectric sensor. The measured H₂ concentration varied from 5 to 25 ppm depending on the concentration of Mo(CO)₆. The possibility of methane decomposition on molybdenum nanoparticles at room temperature was discussed based on the obtained data.

中文翻译：

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室温下钼纳米颗粒表面的甲烷分解

摘要

在室温下，实验研究了甲烷在钼纳米颗粒上的分解。在流动反应器中使用Mo（CO）₆蒸气的UV激光光解在气相中合成钼纳米颗粒。流动反应器的工作部分装有石英窗，用于引入来自以10 Hz频率工作于四次谐波（266 nm）的脉冲Nd：YaG激光器的辐射。甲烷用作载气。在室温下以甲烷与Mo（CO）₆蒸气的混合物进行辐照的结果，合成了2–50 nm的纳米粒子。纳米颗粒的相组成包括纯钼，碳化钼Mo ₂ C和氧化钼MoO _3。。在反应过程中，使用基于半导体金属介电传感器的VG-7高灵敏度氢分析仪测量了氢的产率。取决于Mo（CO）₆的浓度，所测量的H ₂浓度在5ppm至25ppm之间变化。基于获得的数据，讨论了室温下甲烷纳米颗粒上甲烷分解的可能性。