Methanol Synthesis from CO2 Hydrogenation over CuO–ZnO–TiO2 Catalysts: The Influence of TiO2 Content. Issue 1 (15th October 2014)

• Record Type: Journal Article
• Authors: Xiao, Jie; Mao, Dongsen; Guo, Xiaoming; Yu, Jun
• Is Part Of: Energy technology. Volume 3:Issue 1(2015:Jan.)
• Page Start: 32
• Page End: 39
• Publication Date: 2014-10-15
• Subjects: Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201402091
• Languages: English
• ISSNs: 2194-4288

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>A series of CuO–ZnO–TiO<sub>2</sub> catalysts with various TiO<sub>2</sub> loadings were prepared by using a co‐precipitation method. The prepared catalysts were characterized by using X‐ray diffraction (XRD), N<sub>2</sub> adsorption, reactive N<sub>2</sub>O adsorption, X‐ray photoelectron spectroscopy (XPS), temperature‐programmed reduction (TPR), hydrogen temperature programmed desorption (H<sub>2</sub>‐TPD), and CO<sub>2</sub>‐TPD techniques, and tested the extent of methanol synthesis from carbon dioxide (CO<sub>2</sub>) hydrogenation. The results indicate that the addition of TiO<sub>2</sub> to the CuO–ZnO catalyst makes the copper species exist in an amorphous‐like structure or in much smaller crystallites, which promotes the reduction of CuO. Upon increasing the TiO<sub>2</sub> loading, the metallic Cu surface area (<italic>S</italic><sub>Cu</sub>) of the catalyst rises first and then decreases, exhibiting a maximum at a TiO<sub>2</sub> loading of 10 %. The results of the catalytic experiments reveal that the addition of TiO<sub>2</sub> favors the production of methanol, and an optimum catalytic activity is obtained at a TiO<sub>2</sub> loading of 10 %. Moreover, the methanol yield increases linearly with the <italic>S</italic><sub>Cu</sub> of the catalysts, thereby indicating that the addition of TiO<sub>2</sub> enhances the <italic>S</italic><sub>Cu</sub> but not the intrinsic activity.</p> </abstract>