A series of Cu/ZnO/ZrO₂ catalysts were prepared by precipitation-reduction method and tested for the synthesis of methanol by CO₂ hydrogenation. The advantages of precipitation-reduction method over conventional co-precipitation method, the effect of NaBH₄ content were investigated by XRD, N₂ physisorption, SEM, TEM, N₂O chemisorption, XPS, TPR, CO₂-TPD techniques. The influence of precipitation-reduction process on the average Cu particle size, aggregation state and interaction among different elements were discussed in detail. The content of NaBH₄ had an effect on the exposed Cu surface area as well as the ratio of Cu⁰/Cu⁺ and thus influenced the catalytic performance. The catalysts prepared by precipitation-reduction method increased the number of basic sites and had a significant advantage in methanol selectivity in contrast with conventional precipitation method. A suitable NaBH₄ content was beneficial to the catalytic performance in Cu/ZnO/ZrO₂ catalysts and a maximum space time yield of CH₃OH was obtained with B/Cu=5 at 543K.

中文翻译：

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沉淀还原法制备的Cu / ZnO / ZrO2催化剂上CO2加氢制甲醇

采用沉淀还原法制备了一系列Cu / ZnO / ZrO ₂催化剂，并进行了CO ₂加氢合成甲醇的测试。通过XRD，N ₂物理吸附，SEM，TEM，N ₂ O化学吸附，XPS，TPR，CO ₂ -TPD等方法研究了减少沉淀法优于常规共沉淀法，NaBH ₄含量的影响。详细讨论了析出过程对平均Cu粒径，聚集态及不同元素间相互作用的影响。NaBH ₄的含量对暴露的Cu表面积以及Cu ⁰ / Cu的比例都有影响。⁺并因此影响了催化性能。与常规沉淀法相比，通过沉淀还原法制备的催化剂增加了碱性位点的数量，并且在甲醇选择性方面具有显着优势。合适的NaBH ₄含量有利于Cu / ZnO / ZrO ₂催化剂的催化性能，并且在543K下B / Cu = 5时可获得CH ₃ OH的最大时空产率。