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In Situ Real-Time Diffuse Reflection Infrared Fourier Transform Spectroscopy (DRIFTS) Study of Hydrogen Adsorption and Desorption on Ir/SiO2 Catalyst

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The adsorption and desorption of hydrogen on Ir/SiO2 catalyst were studied by using in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) combined with curve-fitting analysis. The results indicate that there are three different surface species formed on the catalyst that correspond to the peaks at 1950, 2010, and 2035 cm−1, respectively, when exposed in H2 flow at 130 °C. These surface species display different adsorption and desorption trends. Surface hydride forms after the catalyst is cooled to 80 °C and it disappears after the catalyst is heated to 130 °C again. This study may help us understand the interaction between hydrogen and noble metals and thus give more insights to heterogeneous catalytic mechanism involving hydrogen and hydrogen storage using metal materials.

Keywords: DRIFTS; Desorption; Diffuse reflection infrared Fourier transform spectroscopy; Hydride; Hydrogen adsorption; In situ measurements

Document Type: Research Article


Affiliations: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004 P.R. China

Publication date: May 1, 2012

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