机械混合法制备酸碱双功能催化剂催化合成异佛尔酮.pdf

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化工进展
3060
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2015年第34卷第8期
foencreeoeroenoc
研究开发
机槭混合法制备酸碱双功能催化剂催化合成异佛尔酮
苑丽质
(唐山学院环境与化学工程系,河北唐山063000
摘要:以氧化镁和氧化铝粉体为主要原料,采用机混合法制备了不同镁铝比的酸碱双功能催化剂,选择丙酮
气相合成异佛尔酮为探针反应,在固定床反应器中对其活性进行了评价,并通过XRD、XPS和TPD等表征手段
对催化剂的性质和结构进行了分析。结果表明,机械混合法催化剂活性較高,镁铝比对催化剂的晶体结构、表
面酸碱强度影响不大,而对催化剂的表面酸碱量有显著影响。当1:18Mg:Al1:1时,催化剂的酸量及碱
量较大,催化剂的活性较高。当镁铝比为1:1时,丙酮的转化率和异氟尔酮的选择性分别为115%和62.8%
通过调节催化荆的装填量,有效地延长了反应物的停留时间,丙酮的转化率大幅提高。当反应条件为常压、反
应温度300℃、空速0.67h1时,丙酮的转化率和异佛尔酮的选择性分别为21.0%和73.0
关键词:氧化镁;氧化铝;催化;机械混合法;合成
中图分类号:O622.4文献标志码:A文章编号:1000-6613(2015)08-3060-05
DOl:10.16085/.issn.1000-6613.2015.08.025
Synthesis of isophoroneon acid-base bifunctional catalysts by machine
mixing method
YUAN Lizhi
(Department of Environmental &Chemical Engineering Tangshan College, Tangshan 063000, Hebei, China)
Abstract The catalysts with different ratio of Mg and Al were prepared by machine mixing method
with Mgo and Al2 O3 as raw materials, the activity of catalysts was evaluated in a fixed bed reactor
with the synthesis of isophorone by gas acetone as probe reaction, and the catalysts were characterized
by XRD, XPS and TPD. The results showed that the activity of catalysts prepared by machine mixing
method was high, the ratio of Mg and Al had little effect on the crystalline structure and surface
acid-base strength, but had significant effect on the surface acid-base amount of catalysts. When the
ratio of Mg and Al was 1 1.8 to 11, the surface acid-base amount of catalysts was higher, so the
activity of catalysts was higher. When the ratio of Mg and Al was 1. 1, the conversion of acetone and
selectivity of isophorone were 11. 5% and 62.8% respectively. By adjusting catalyst loading amount, the
residence time of reactants was effectively prolong, the conversion of acetone was increased. Under the
reaction conditions of atmospheric pressure, reaction temperature 300C, liquid space velocity 0.67h
the conversion of acetone and the selectivity of isophorone were 21.0%and 73.0% respectively
Key words: magnesia(M O); oxidation aluminium(A1203 ); catalysis; machine mixing method; synthesis
异佛尔酮( isophorone,ISO)是丙酮化学中的化生产异佛尔酮的规模却较小,技术也相对落后
第一代衍生物,因具有较高的沸点、很低的吸湿性、
微小的蒸发速度和突出的溶解性能而成为重要的酮收稿日期:201501-21:修改稿日期:20504+13
基金项目:唐山市科技局计划项目(13130251z)及河北省教育斤项目
类溶剂,广泛应用于涂料、胶黏剂、塑料、医药、
(Z2015007)。
香料等行业中。其需求量与日俱增,但国内工业作者简介:苑丽质(190-),女,讲师。 E-mail yuanlizhiv26m