Sr-Zn混合氧化物作为酸碱双功能催化剂在甘油选择性羰基化制碳酸甘油†中的研究

IF 2.5 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Piyusa Priyadarsan Pattanaik, Nagesh Yasam, Shiva Kumar Potharaju, Gunasekar Gunniya Hariyanandam and Lingaiah Nakka
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引用次数: 0

摘要

将甘油(GLY)转化为高价值化学品对于提高生物柴油工业的经济可行性和可持续性至关重要。本研究探索了在无溶剂条件下,以碳酸二甲酯(DMC)为羰基化剂,在Sr-Zn混合氧化物催化剂上将GLY转化为碳酸甘油(GLC)。采用共沉淀法制备了一系列不同Sr/Zn摩尔比的Sr - Zn (SZ)混合氧化物双功能催化剂。ZnO在SrO晶格中的存在稳定了晶格内的锶,产生了具有最佳酸碱强度和表面积的协同酸碱双功能位点。制备的Sr - Zn混合金属氧化物在活性和稳定性方面优于单独的Sr和Zn氧化物。与两种金属氧化物的物理混合物相比,SrO和ZnO在混合氧化物催化剂中的协同作用导致了优异的甘油羰化反应。当Sr-Zn摩尔比为2:1 (sz21)时,该催化剂的GLC收率为95%,选择性接近100%。sz21催化剂对粗甘油中的杂质也表现出了一致的活性,并且在研究的六次循环中表现出了优异的稳定性。GLY羰基化反应动力学研究显示为准一级反应动力学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Studies on Sr–Zn mixed oxides as acid–base bifunctional catalysts for the selective carbonylation of glycerol to glycerol carbonate†

Studies on Sr–Zn mixed oxides as acid–base bifunctional catalysts for the selective carbonylation of glycerol to glycerol carbonate†

Transforming glycerol (GLY) into high-value chemicals is essential for enhancing the economic viability and sustainability of the biodiesel industry. This study explores the conversion of GLY into glycerol carbonate (GLC) using dimethyl carbonate (DMC) as a carbonylating agent under solvent-free conditions over Sr–Zn mixed oxide catalysts. A series of Sr–Zn (SZ) mixed oxide bifunctional catalysts with different Sr/Zn molar ratios were prepared via a co-precipitation method. The presence of ZnO in the SrO lattice stabilised strontium within the lattice, generating synergistic acid–base bifunctional sites with optimum amount of acdic/basic strength and surface area. The as-prepared Sr–Zn mixed metal oxides outperformed individual Sr and Zn oxides in terms of activity and stability. In contrast to the physical mixture of both metal oxides, the synergistic interaction of SrO and ZnO in the mixed oxide catalyst resulted in excellent glycerol carbonylation. The catalyst with a Sr–Zn molar ratio of 2 : 1 (SZ 21) exhibited excellent performance with 95% GLC yield and almost 100% selectivity. The SZ 21 catalyst also demonstrated consistent activity with remarkable resilience to impurities in crude glycerol and demonstrated exceptional stability during the studied six recycles. The kinetic study of GLY carbonylation showed a pseudo-first-order reaction kinetics.

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来源期刊
New Journal of Chemistry
New Journal of Chemistry 化学-化学综合
CiteScore
5.30
自引率
6.10%
发文量
1832
审稿时长
2 months
期刊介绍: A journal for new directions in chemistry
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