花状微球NiO/CeO_2催化剂上乙醇水蒸气重整制氢研究

用水热法制备微米尺寸CeO2花状微球粉体,并通过浸渍/热分解法在该粉体上担载纳米尺寸的NiO颗粒,制得催化剂NiO/CeO2。对催化剂进行了XRD、SEM、XES和BET物性表征。经固定床反应器对催化剂的催化性能进行测试。装载1.0 g催化剂,液体处理量0.05 mL/min。结果表明,该方法合成的催化剂NiO/CeO2对低温乙醇水蒸气重整反应表现出较高的活性和稳定性。同时通过微量Cr、Zn、Cu的加入在低温区抑制了CO、CH4的生成,提高了H2的产率和催化剂的抗积炭能力。该催化剂连续稳定性测试达到2 000 h;进行反复起动稳定性测试12次后,未表现出失活特征。

Hydrogen production by steam reforming of ethanol over flowerlike micro spheres NiO/CeO 2 catalyst

CeO₂ samples were prepared by the hydrothermal method. The NiO/CeO₂ catalyst was prepared by impregnation. The catalyst was characterized by means of X-ray diffraction(XRD),Scanning Electronic Microscope(SEM) combined by the X-ray energy spectrometer (XES) and BET area. The catalysis properties of the catalysts were tested using a fix bed micro-reactor fitted in a programmable oven. 1.0g catalyst was loaded and the in flow liquid was 0.05mL/min. Results showed that NiO/CeO₂ had high activity and stability on low temperature ethanol steam reforming reaction. And, trace amount of Cr, Zn, Cu were added to inhibit CO, CH₄ formation and to improve the yield of H₂ as well the resistance to carbon deposition greatly. Catalyst stability was achieved in more than 2000h reaction. Cycle test repeated 12 times and showed high stability and good catalytic activity.