采用完全液相法,分别以无机和有机Al源和Zr源制备了3个Cu-Zn-Al-Zr浆状催化剂,并采用X射线衍射、X射线光电子能谱和程序升温还原等手段对催化剂进行了表征,考察了催化剂在合成气一步法合成二甲醚反应中的催化性能.结果表明,不同Al源对催化剂的性能有显著影响,而不同Zr源对催化剂性能的影响不大.以异丙醇铝为原料制备的催化剂的活性明显高于以拟薄水铝石为原料制备的催化剂.以异丙醇铝为Al源制备的催化剂,其Cu组分粒度小、分散性好,Cu-Zr之间的相互作用较强.Al源中微量杂质Na的存在和Cu-Zr之间相互作用的强弱是导致催化剂性能差异的主要原因.
Cu-Zn-Al-Zr slurry catalyst samples were prepared from different raw materials of Al and Zr by a complete liquid-phase technol- ogy and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and H_2 temperatare-programmed reduction. The catalytic performance of the samples for the direct synthesis of dimethyl ether from syngas was evaluated in a slurry reactor. The results indicated that different A1 raw materials influenced obviously the catalyst performance, while different Zr raw matecials had little effect on the catalyst performance. The activity of the catalyst samples with aluminum isopropoxide as the raw material was significantly higher than that with pseudo-boehmite. The catalyst samples with aluminum isopropoxide as the raw material had good Cu dispersion and strong interaction be-tween Cu and Zr. It was concluded that the existence of trace Na in AI raw materials and the strong interaction between Cu and Zr were the main reasons for good catalytic performance.
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