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第 36 卷第 1 期 精 细 化 工 Vol.36, No.1
201 9 年 1 月 FINE CHEMICALS Jan. 2019
催化与分离提纯技术
Mn 含量对 Cu-Mn-Al 催化丙二醇单甲醚
脱氢的影响
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谭 旭 ,陈晓蓉 1,2 ,朱 明 1,2 ,於德伟 ,许 岩 ,梅 华 1,2*
(1. 南京工业大学 化工学院,江苏 南京 210009;2. 南京(诺盟化工)催化氢化工程技术研究中心,江
苏 南京 210009)
摘要:以硝酸铜、硝酸锰、硝酸铝和碳酸钠为原料,通过共沉淀法制备了不同 Mn 含量的 Cu-Mn-Al 催化剂。采
用 BET,XRD,SEM,TEM,H 2 -TPR 和 NH 3 -TPD 等对催化剂进行了表征,在固定床反应器上考察了催化剂对
丙二醇单甲醚直接脱氢制备甲氧基丙酮反应活性的影响。结果表明:Mn 含量对 Cu-Mn-Al 催化剂理化性质有较
大影响。适 量添加 Mn 能够促进 Cu 的分散, 改变催化剂 还原性能, 降低催化剂 表面酸性。 当
n(Cu) : n(Mn) : n(Al)=2.0 : 3.5 : 1.0 时,Cu-Mn-Al 催化剂表面酸量低,具有较低还原温度。在反应温度 260 ¥、
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常压、进料组成为含 5%(质量分数)水的丙二醇单甲醚溶液、液时空速为 2.5 h 的条件下,该催化剂上丙二
醇单甲醚转化率可达 61.57%,甲氧基丙酮选择性可达 96.83%,且副产物丙酮选择性低,为 1.20%。
关键词:丙二醇单甲醚;脱氢;甲氧基丙酮;Cu-Mn-Al;酸性;催化技术
中图分类号:TQ426.8; O643.38 文献标识码:A 文章编号:1003-5214 (2019) 01-0082-06
Effect of Mn Content on the Catalytic Properties of Cu-Mn-Al
Catalysts for Dehydrogenation of 1-Methoxy-2-propanol
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TAN Xu , CHEN Xiao-rong , ZHU Ming , YU De-wei , XU Yan , MEI Hua 1,2*
(1. College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China; 2. Catalytic Hydrogenation
Engineering Technology Research Center, Nuomeng Chem., Nanjing 210009, Jiangsu, China)
Abstract: A series of Cu-Mn-Al catalysts with different Mn content were synthesized by co-precipitation
method using cupric nitrate, manganous nitrate, aluminium nitrate and sodium carbonate as raw materials.
The samples were characterized by BET, XRD, SEM, TEM, H 2-TPR and NH 3-TPD. The dehydrogenation
of 1-methoxy-2-propanol to methoxyacetone over Cu-Mn-Al catalysts were investigated in a fixed bed
reactor. The results show that Mn content have great effect on the pyhsico-chemical properties of Cu-Mn-Al
catalysts. Appropriate Mn addition can promoted the dispersion of Cu, change the reducibility of Cu-Mn-Al
and reduce its surface acidity. Especially, when the Cu/Mn/Al molar ratio was 2.0 : 3.5 : 1.0, the Cu-Mn-Al
catalyst had the lowest surface acidity and lower reduction temperature. Under the conditions of reaction
temperature 260 ¥, reaction pressure 1 atm, 1-methoxy-2-propanol containing 5% water (mass fraction),
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liquid hourly space velocity 2.5 h , the conversion of 1-methoxy-2-propanol was 61.57%, the selectivity of
methoxyacetone was 96.83%, and the selectivity of main byproduct acetone was 1.20%.
Key words: 1-methoxy-2-propanol; dehydrogenation; methoxyacetone; Cu-Mn-Al; acidity; catalysis
technology
甲氧基丙酮(MOA)是一种重要的化工原料, 效低毒除草剂 [1-2] 。合成甲氧基丙酮的方法有很多 [3-6] ,
可用于多种化学品的生产,其最重要的用途是用来 其中,丙二醇单甲醚(MOP)脱氢法是最经济、简
[7]
合成异丙甲草胺。异丙甲草胺是一种广泛应用的高 单、环保的方法 ,反应式如下:
收稿日期:2018-03-07; 定用日期:2018-05-29; DOI: 10.13550/j.jxhg.20180155
作者简介:谭 旭(1993—),女,硕士生。联系人:梅 华(1970—),男,教授,E-mail:meihua@njtech.edu.cn。