Cu/ZnO/Al2O3/ZrO2 (CZAZr) catalysts were prepared by a coprecipitation method. CO2 was introduced into aging solution to get CZAZr precusors with malachite phase. The x value inCZAZr(x) is the metallic ratio of the Zr component at a fixed metallic ratio of Cu:Zn:Al of 6:3:1. TOFMeOH of CZAZr(0) was 0.56 μmol/m2Cu/s at 250 °C, 50 atm and a gas hourly space velocity (GHSV) of 12 000 mL/gcat/h. TOFMeOHs of CZAZr(1), CZAZr (2), CZAZr(3), and CZAZr(4) were 0.64, 0.90, 0.99, and 1.08 μmol/m2Cu/s at the same reaction condition, respectively. TOFMeOHs of CZAZr catalysts increased with increasing ZrO2 content, indicating that high TOFMeOH of CZAZr catalysts came from ZrO2 as compared with CZAZr(0) catalysts. These kinetic data on CZAZr catalysts in the practical reaction condition proved the suggestion from previous infrared (IR) study on Cu/Zr catalysts. ZrO2 afforded the adsorption sites for CO and CO2 insertion into Zr-OH and Cu supplied active hydrogen to ZrO2 for hydrogenating formate and hydroxycarbonate to methanol on ZrO2 in addition to methanol synthesis on Cu/ZnO/Al2O3.
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© 2015 Korean Chemical Society, Seoul & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim .
- Cu/ZnO/AlO/ZrO catalyst
- Hydrogen spillover
- Methanol synthesis
- Structure sensitivity
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