1.沈阳化工大学 化学工程学院,辽宁 沈阳110142
2.中国科学院 大连化学物理研究所,辽宁 大连 116000
苗昱露(1999—),硕士研究生,研究方向为工业催化,E-mail:miaoyulu@dicp.ac.cn。
张军营(1985—),博士,副研究员,研究方向为工业催化,E-mail:zhangjunying@dicp.ac.cn;
贾松岩(1983—),博士,副教授,研究方向为工业催化,E-mail:jiasongyan@126.com。
收稿:2024-11-19,
修回:2024-12-25,
纸质出版:2025-11-25
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苗昱露,杨培达,商雪航等.钯铋双组分催化剂的乙二醇氧化酯化制乙醇酸甲酯催化性能研究[J].低碳化学与化工,2025,50(11):29-35.
MIAO Yulu,YANG Peida,SHANG Xuehang,et al.Study on catalytic performance of palladium bismuth two-component catalyst for oxidative esterification of ethylene glycol to methyl glycolate[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(11):29-35.
苗昱露,杨培达,商雪航等.钯铋双组分催化剂的乙二醇氧化酯化制乙醇酸甲酯催化性能研究[J].低碳化学与化工,2025,50(11):29-35. DOI: 10.12434/j.issn.2097-2547.20240464.
MIAO Yulu,YANG Peida,SHANG Xuehang,et al.Study on catalytic performance of palladium bismuth two-component catalyst for oxidative esterification of ethylene glycol to methyl glycolate[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(11):29-35. DOI: 10.12434/j.issn.2097-2547.20240464.
以乙二醇为原料,通过氧化酯化制备乙醇酸甲酯是实现乙二醇高值化、低碳化和多样化利用的有效途径。纳米金催化剂是一种常用的氧化酯化催化剂,但在乙二醇氧化酯化反应中存在活性差、贵金属使用量大和成本高等缺点,限制了其应用。因此,需要发展一种高效且价格相对低廉的催化剂。通过等体积浸渍法制备了一系列钯基催化剂,并详细考察了其在乙二醇氧化酯化制乙醇酸甲酯反应中的催化性能。结果表明,在钯基催化剂中引入第二组分,可以显著改善催化剂活性和产物选择性。通过XRD、TEM、XPS和H
2
-TPR等手段对催化剂进行了表征,发现引入的第二组分会与钯形成金属间化合物,导致主要活性组分钯的电子性质发生明显变化,进而提高了催化剂活性和产物选择性。对第二组分的种类及含量、催化剂还原温度、原料比和反应温度等进行了考察,发现引入铋的催化剂具有最佳的催化效果。在钯和铋质量分数分别为1.00%和还原温度为300 ℃的Pd-Bi/Al
2
O
3
催化剂催化下,当
n
(乙二醇)/
n
(Na
2
CO
3
) = 200、
n
(甲醇)/
n
(乙二醇) = 20时,乙二醇转化率可达88.0%,乙醇酸甲酯选择性可达90.1%(120 ℃,4 h)。
The preparation of methyl glycolate from ethylene glycol as raw material by oxidative esterification is an effective way to realize high value
low carbonization and diversified utilization of ethylene glycol. Nano-gold catalyst is a kind of commonly used catalysts for oxidative esterification
but its application in the reaction is limited due to its poor activity
large amount of precious metals used and high cost. Therefore
it is necessary to develop an efficient and relatively inexpensive catalyst. A series of palladium-based catalysts were prepared by equal volume impregnation method
and their catalytic performance for oxidative esterification of ethylene glycol to methyl glycolate was investigated. It is found that the catalyst activity and product selectivity can be significantly improved by introducing the second component into the palladium-based catalyst. The catalysts were characterized by XRD
TEM
XPS and H
2
-TPR. The results show that the second component forms intermetallic compounds with palladium
resulting in significant changes in the electronic properties of palladium
thereby improving catalyst activity and product selectivity. The types and contents of the second component
the reduction temperature of catalyst
the rati
o of raw materials and the reaction temperature were investigated. It is found that the catalyst introducing bismuth has the best catalytic performance. Under the catalysis of Pd-Bi/Al
2
O
3
catalyst with palladium and bismuth mass fractions of 1.00%
respectively and reduction temperature of 300 ℃
when
n
(ethylene glycol)/
n
(Na
2
CO
3
) = 200 and
n
(methanol)/
n
(ethylene glycol) = 20
the ethylene glycol conversion rate reaches 88.0% and methyl glycolate selectivity reaches 90.1% (120 ℃
4 h).
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