Preparation of palladium-based catalysts and use for depolymerization of larch bark tannins

IF 1.4 4区 工程技术 Q3 ENGINEERING, CHEMICAL Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-06-17 DOI:10.1002/apj.3088
Nianci Liu, Te Li, Zhuorui Zhang, Ling Su, Guiquan Jiang
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Abstract

In this study, we synthesized eight palladium-based catalysts using two carriers, ZrO2 and MCM-41. These catalysts were used for the degradation of condensed tannins extracted from larch bark. The average polymerization degree and degradation rate of the products were used as indicators to evaluate the efficiency of degradation. The effects of different Pd:Cu loading ratios under the same carrier conditions and the effects of different carriers under the same Pd:Cu loading ratio were investigated. The results revealed that when the carrier was kept constant, the Pd:Cu ratio of 1:1 exhibited the highest efficiency in degrading condensed tannins. Moreover, when the Pd:Cu loading ratio was the same, the degradation efficiency was higher when ZrO2 was used as the carrier. Based on these findings, the catalyst (Pd1-Cu1)5/ZrO2 (where “1” are the molar ratios of Pd to Cu added during the preparation of the catalyst and where ‘5’ is the mass percentage of Pd/Cu metal to total catalyst, i.e., 5 wt%), with ZrO2 as the carrier and a Pd:Cu ratio of 1:1, demonstrated the highest degradation efficiency, with a degradation rate of 73.89%. This catalyst successfully reduced the average polymerization degree of condensed tannins from 9.5 to 2.48.

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钯基催化剂的制备及其在落叶松树皮单宁解聚中的应用
在这项研究中,我们使用 ZrO2 和 MCM-41 两种载体合成了八种钯基催化剂。这些催化剂用于降解从落叶松树皮中提取的缩合单宁。产物的平均聚合度和降解率被用作评估降解效率的指标。研究了相同载体条件下不同 Pd:Cu 负载比的影响,以及相同 Pd:Cu 负载比下不同载体的影响。结果表明,当载体保持不变时,Pd:Cu 的比例为 1:1 时,降解缩合单宁的效率最高。此外,当 Pd:Cu 负载比相同时,以 ZrO2 为载体的降解效率更高。基于这些发现,以 ZrO2 为载体、Pd:Cu 比为 1:1 的催化剂 (Pd1-Cu1)5/ZrO2 (其中 "1 "为制备催化剂时添加的 Pd 与 Cu 的摩尔比,"5 "为 Pd/Cu 金属占催化剂总量的质量百分比,即 5 wt%)的降解效率最高,降解率达 73.89%。该催化剂成功地将缩合单宁的平均聚合度从 9.5 降至 2.48。
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自引率
11.10%
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111
期刊介绍: Asia-Pacific Journal of Chemical Engineering is aimed at capturing current developments and initiatives in chemical engineering related and specialised areas. Publishing six issues each year, the journal showcases innovative technological developments, providing an opportunity for technology transfer and collaboration. Asia-Pacific Journal of Chemical Engineering will focus particular attention on the key areas of: Process Application (separation, polymer, catalysis, nanotechnology, electrochemistry, nuclear technology); Energy and Environmental Technology (materials for energy storage and conversion, coal gasification, gas liquefaction, air pollution control, water treatment, waste utilization and management, nuclear waste remediation); and Biochemical Engineering (including targeted drug delivery applications).
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