Influence of different precipitants on the properties of Cu-ZnO-ZrO2 catalyst for methanol synthesis through CO2 hydrogenation

doi:10.16085/j.issn.1000-6613.2016-2217

Abstract

Abstract: Cu-ZnO-ZrO₂(molar ratio CuO:ZnO:ZrO₂=5:4:1) catalysts were prepared using different precipitants(NH₃·H₂O、NaHCO₃、Na₂CO₃)by concurrent-flow co-precipitation method. XRD,XPS,H₂-TPR and CO₂-TPD were used to characterize the physico-chemical properties of the catalysts,and the catalysts activity were evaluated in a high temperature and high pressure micro-reactor. The influences of different precipitants on the catalyst precursors and catalysts component structure,CuO-ZnO interaction for methanol synthesis through carbon dioxide hydrogenation were studied. Results show that the influence of different precipitants on the physico-chemical properties and activity of catalysts was very great. When the precipitants of NaHCO₃ and Na₂CO₃ were used,they was helpful to produce aurichalcites in catalyst precursors,which,after calcination,were effective to prevent the growth of CuO particles,and to improve the dispersion of the metal copper oxide,increase the metal surface basic sites,enhance CuO-ZnO interaction,and raise the catalysts activity. More aurichalcites were produced in the catalyst precursors by using NaHCO₃ as the precipitant,and the particle size of the CuO was 8.6nm,the copper specific surface area was 15.38m²/g,the dispersion degree of copper was 11.9%,the selectivity of methanol was 42.29%,the yield of methanol was 0.094g/(g_cat·h),and the catalyst activity was the highest.

Key words: precipitants, carbon dioxide, catalysts, hydrogenation, methanol

摘要： 分别以NH₃·H₂O、NaHCO₃、Na₂CO₃为沉淀剂，采用并流沉淀法制备Cu-ZnO-ZrO₂（摩尔比为5：4：1）催化剂，通过XRD、XPS、H₂-TPR、CO₂-TPD表征技术对催化剂进行理化性能测试，并在高温高压微反应器上对催化剂活性进行评价。研究了CO₂加氢制甲醇反应中不同沉淀剂对催化剂前体、催化剂母体组分结构以及CuO-ZnO间相互作用的影响。结果表明，不同沉淀剂对催化剂理化性能及催化活性有较大影响。以NaHCO₃、Na₂CO₃为沉淀剂，有利于催化剂前体中形成绿铜锌矿相，经焙烧后，抑制CuO颗粒长大，提高铜的分散度，使表面碱性位浓度增大，CuO-ZnO间相互作用增强，最终提高催化剂活性。其中，以NaHCO₃为沉淀剂，有利于催化剂前体形成更多的绿铜锌矿相，焙烧过程产生更多的铜锌固溶体，促使形成强的CuO-ZnO相互作用，形成的CuO颗粒粒径为8.6nm，铜的比表面积为15.38m²/g，铜分散度为11.9%，甲醇的选择性和收率分别为42.29%和0.094g/（g_cat·h），催化剂活性最好。

关键词: 沉淀剂, 二氧化碳, 催化剂, 加氢, 甲醇

CLC Number:

O643

CHENG Pengze, GAO Wengui, NA Wei, WANG Yuhao, LI Yanyan, XU Maomao. Influence of different precipitants on the properties of Cu-ZnO-ZrO₂ catalyst for methanol synthesis through CO₂ hydrogenation[J]. Chemical Industry and Engineering Progress, 2017, 36(08): 2955-2961.

程鹏泽, 高文桂, 纳薇, 王禹皓, 李艳艳, 徐毛毛. 不同沉淀剂对CO₂加氢合成甲醇Cu-ZnO-ZrO₂催化剂性能的影响[J]. 化工进展, 2017, 36(08): 2955-2961.

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Influence of different precipitants on the properties of Cu-ZnO-ZrO₂ catalyst for methanol synthesis through CO₂ hydrogenation

不同沉淀剂对CO₂加氢合成甲醇Cu-ZnO-ZrO₂催化剂性能的影响

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