文献类型：期刊文献

中文题名：乙烯直接催化氧化合成醋酸I.负载型Pd-杂多酸催化剂的组成

英文题名：Direct Catalytic Oxidation of Ethylene to Acetic Acid I. The Composition of Loaded Pd-Heteropoly Acid Catalyst

作者：姚军品[1];徐佩若[1];徐争勇[1];朱志华[1]

机构：[1]华东理工大学化工学院,上海200237

年份：2001

卷号：27

期号：1

起止页码：46

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：乙烯;醋酸;催化氧化;负载型Pd-杂多酸催化剂;转化率;合成;催化剂组成;催化活性

外文关键词：ethylene; oxidation; acetic acid; Pd heteropoly acid catalyst

摘要：研究了负载型 Pd-杂多酸催化剂对乙烯直接氧化合成醋酸的催化作用 ,由固定床反应器考评其催化性能 ,借助 XRD对催化剂进行表征。结果表明 :以 Si O2 为载体 ,经引入助催化剂 Te和Cr,当催化剂组成为 w Pd=0 .0 3、w HSi W=0 .60 (以载体质量为基准 )及 Te∶ Pd=1∶ 2 0、Cr∶ Pd=1∶ 30 (原子比 )时 ,催化剂具有较理想的活性与选择性 ,乙烯的转化率与醋酸的选择性分别达 3.5%和 84.1 % ,醋酸单程时空收率 1 57.8g/(L·h)。
The effect of Pd HSiW Cr Te/SiO 2 on direct oxidation of ethylene to acetic acid was researched in a fixed bed reactor, and the catalyst was investigated by XRD. The results showed that Pd HSiW Cr Te/SiO 2 was an ideal catalyst for direct oxidation of C 2H 4 to acetic acid. Pd and HSiW were the necessary active components and had excellent effect, the suitable contents of them were w Pd =0.03 and w HSiW =0.60(both based on carrier weight). In order to improve the catalytic performance of Pd HSiW/SiO 2, a series of promotors were studied. As a consequence, Te and Cr had excellent effect. By adding trace Te and Cr, the by products CO 2 and CH 3CHO could be decreased greatly. The suitable contents of Te and Cr were Te∶Pd=1∶20 and Cr∶Pd=1∶30(atom ratio). It was discovered by XRD that on the catalyst there was an active structure between Pd and HSiW, and the form of Te and Cr was in oxidative state: Te 2O 5 and CrO 2. When the reaction conditions were as follows: T =190°C, p =0.80MPa, SV = 4 000h -1 , and the composition of reaction mixture gas was C 2H 4∶O 2∶N 2∶H 2O=50∶6∶14∶30(mol ratio). The catalyst had ideal catalytic performance: the conversion of C 2H 4 and the selectivity of acetic acid could reach 3.5% and 84.1% respectively, and the by products CO 2 and CH 3CHO were 12.4% and 1.1%. The once through space time yield of acetic acid could reach 157.8g/(L·h).