共沸蒸馏法制备CuO-ZnO/Al2O3催化剂及其对催化性能的影响

doi:10.11944/j.issn.1000-0518.2015.05.140295

摘要/Abstract

摘要：

以异丁醇为共沸溶剂,采用共沸蒸馏-共沉淀方法制备了Cu基CuO-ZnO/Al₂O₃负载型催化剂。利用X射线衍射(XRD)、热重差热(TG/DSC)、扫描电子显微镜(SEM)等技术手段对产物形貌和结构进行了表征。结果表明,共沸蒸馏能有效脱除前驱体溶胶中的游离水,抑制粒子之间的团聚;同时异丁醇与聚乙二醇共同作用影响颗粒的Ostwald熟化,使粒度分布均匀、分散性能优异、增强了催化剂中CuO组分分散性。在固定床反应器中对CO₂加氢直接合成甲醇的催化性能进行了评价。考察了不同催化剂的催化性能,结果表明,与直接干燥法制备的催化剂相比,共沸蒸馏法制备的催化剂具有更好的催化性能和催化稳定性,甲醇的收率最大可达到9.6%,甲醇收率提高29.7%。

关键词: 共沸蒸馏法, CuO-ZnO/Al2O3催化剂, CO2加氢, 甲醇合成

Abstract:

The CuO-ZnO/Al₂O₃ catalysts were successfully prepared using the coprecipitation-azeotropic distillation method using isobutyl alcohol as the azeotropic solvent. The catalysts were characterized by X-ray diffraction and thermogravimetry/differential thermal analysis and scanning electron microscopy. The results show that azeotropic distillation can effectively remove free water in the precursor sol to inhibit particle agglomeration and partial sintering caused by the heating process. At the same time combination of isobutanol and polyethylene glycol inhibits the Ostwald ripening of particles to obtain uniform particle size distribution and excellent dispersion of CuO components in catalyst particles. Direct hydrogenation of CO₂ to methanol was carried out in a fixed bed flow reactor. The experiments show that the catalysts prepared by the azeotropic distillation have better catalytic performance and stability than those the direct drying method.

Key words: azeotropic distillation method, CuO-ZnO/Al2O3 catalysts, CO2 hydrogenation, methanol synthesis

中图分类号:

贾若琨, 赵光宇, 林松竹, 靳军灿. 共沸蒸馏法制备CuO-ZnO/Al₂O₃催化剂及其对催化性能的影响[J]. 应用化学, 2015, 32(5): 570-575.

JIA Ruokun, ZHAO Guangyu, LIN Songzhu, JIN Juncan. Preparation of CuO-ZnO/Al₂O₃ Catalysts by Azeotropic Distillation Method and Its Influence on the Catalytic Performance[J]. Chinese Journal of Applied Chemistry, 2015, 32(5): 570-575.

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共沸蒸馏法制备CuO-ZnO/Al₂O₃催化剂及其对催化性能的影响

Preparation of CuO-ZnO/Al₂O₃ Catalysts by Azeotropic Distillation Method and Its Influence on the Catalytic Performance

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