文章摘要
李贵贤,李发达.低负载量Ru-W-B/NaY催化剂的制备及其加氢性能[J].精细化工,2019,36(6):
低负载量Ru-W-B/NaY催化剂的制备及其加氢性能
Preparation of Low-load Ru-W-B/NaY Catalyst and Catalytic Performance for Hydrogenation of Hydroquinone
投稿时间:2018-10-20  修订日期:2018-12-18
DOI:
中文关键词: 非晶态合金  低负载量  对苯二酚  催化加氢  1,4-环己二醇
英文关键词: Amorphous alloy  Low-load  Hydroquinone  Catalytic hydrogenation  1, 4-cyclohexanediol
基金项目:
作者单位E-mail
李贵贤 兰州理工大学石油化工学院 lgxwyf@163.com 
李发达 兰州理工大学石油化工学院 765603025 
摘要点击次数: 89
全文下载次数: 0
中文摘要:
      通过浸渍-化学还原法制备出了一系列低负载量的钌基催化剂,在Ru-B二元催化体系中加入少量W,催化剂催化性能显著提高,且采用反加法、超声波辅助法及添加分散剂PEG对载体NaY进行涂覆,进一步改良了Ru催化剂的加氢性能。采用XPS、H2-TPD、XRD、SEM、ICP-OES等一系列表征手段对催化剂物相结构、组成、形貌等进行详细表征,发现采用反加法、添加W、超声波辅助、使用PEG对载体NaY进行涂覆制备的催化剂活性金属粒子分散更均匀,活性位数量更多。以对苯二酚加氢制1,4-环己二醇为探针反应对所制备的催化剂进行活性测试,发现Ru-W-B/NaY-IUP(1500)0.6加氢性能最为优越,对苯二酚转化率为99.7 %,1,4-环己二醇选择性为92.3 %,而钌负载量仅为0.45 %。此外,研究了反应液pH值对加氢反应的影响,发现反应液pH值对反应结果的影响巨大,当反应液呈碱性时,其反应速率得到极大提高,说明碱性环境更有利于对苯二酚加氢制1,4-环己二醇。
英文摘要:
      A series of low-load ruthenium-based catalysts were prepared by impregnation-chemical reduction method. A small amount of W was added to the Ru-B binary catalyst system, and the catalytic performance of the catalysts was improved. Furthermore, when the inverse addition, ultrasonic assisted, and PEG-coated carrier NaY were used, the performance of the ruthenium-based catalysts is superior. The structure, composition and surface morphology of the catalyst were characterized by XPS, H2-TPD, XRD, SEM and ICP-OES. It was found that the reverse addition, W addition, ultrasonic assisted, and PEG-coated carrier NaY are beneficial to more uniformly dispersed for the active particles and have more active sites. The activity of the prepared catalysts was tested via hydrogenation of hydroquinone to 1,4-cyclohexanediol. It was found that Ru-W-B/NaY-IUP(1500)0.6 has the most excellent hydrogenation performance. The conversion of hydroquinone was 99.7 %, the selectivity to 1,4-cyclohexanediol was 92.3 %, while the ruthenium loading was only 0.45 %. In addition, the effect of pH value on the hydrogenation of hydroquinone was studied, the results showed that the pH value of the reaction solution had a great influence on the reaction. When the reaction solution was alkaline, the reaction rate was greatly accelerated, indicating that the alkaline environment is more favorable to the hydrogenation of hydroquinone to 1,4-cyclohexanediol.
查看全文   查看/发表评论  下载PDF阅读器
关闭