Enhancement of stability and activity of Cu/ZnO/Al₂O₃ catalysts by colloidal silica and metal oxides additives for methanol synthesis from a CO₂-rich feed

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• 作者：Elnaz Samei^a ; Majid Taghizadeh^a ; ^{m_taghizadehfr@yahoo.com} ; Mohsen Bahmani^b
• 关键词：Accelerated deactivation test ; Cu/ZnO/Al2O3 catalyst ; Methanol synthesis ; Stability ; Activity
• 刊名：Fuel Processing Technology
• 出版年：2012
• 期刊代码：36_03783820
• 类别：ce
• 出版时间：April, 2012
• 卷：96
• 期：Complete
• 页码：128-133
• 文件大小：764 K

摘要

A series of Cu/ZnO-based catalysts were prepared through co-precipitation and alternative pH precipitation methods by adding small amount of colloidal silica (0.6 wt.%) and Mn, Ga and Zr oxides for methanol synthesis from a CO₂-rich feed. The prepared catalysts were characterized by a variety of techniques, including X-ray diffraction, N₂O chemisorption, temperature programmed reduction, BET and TEM. Catalytic tests were carried out in a fixed bed reactor at 4.5 MPa and 513 K with a mixture of CO/CO₂/H₂ = 1/1.38/16.5 and GHSV of 15,000 h^-1. An accelerated thermally induced deactivation test was performed in the middle of the catalytic performances. During accelerated thermal test and after rising the temperature, an upward trend was observed for space time yield (STY) over the catalysts. The experimental results indicated that a small amount of SiO₂ and the oxide additives could significantly improve the catalyst activity and stability.