Influence of crystallinity of zeolite NaX as a support for potassium catalyst in transesterification of palm oil

IF 4.3 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physics and Chemistry of Solids Pub Date : 2024-10-18 DOI:10.1016/j.jpcs.2024.112389

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Abstract

Zeolite NaX samples synthesized from varying hydrothermal times (HTx, x = 0, 4, 8, 12, and 24 h) were impregnated with potassium (K) to produce K/HTx as catalysts in the transesterification of palm oil with methanol. The goal of this work is to explore the influence of the crystallinity of zeolite NaX on biodiesel production. The findings from XRD, N₂ sorption, SEM-EDS, FTIR, and CO₂-TPD demonstrate that the longer hydrothermal treatment times enhance the zeolite NaX crystallinity. A pure phase of zeolite NaX was achieved from hydrothermal times of 8 h or longer. The HT0 and HT4 exhibited poor crystallinity, and consequently, the supported catalysts, K/HT0 and K/HT4, provided low biodiesel yields (29.7 % and 43.9 %, respectively) despite having similar surface area, functional groups, and morphology. The catalysts supported on fully crystallized zeolite NaX gave biodiesel yields of about 80 %. The enhanced crystallinity of zeolite increased the basicity of the K/NaX, resulting in an improved catalytic performance for the transesterification of palm oil.

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作为棕榈油酯交换反应钾催化剂载体的沸石 NaX 结晶度的影响

将不同水热时间（HTx，x = 0、4、8、12 和 24 小时）合成的沸石 NaX 样品与钾（K）浸渍，制成 K/HTx 催化剂，用于棕榈油与甲醇的酯交换反应。这项工作的目的是探索沸石 NaX 的结晶度对生物柴油生产的影响。XRD、N2 吸附、SEM-EDS、FTIR 和 CO2-TPD 的研究结果表明，水热处理时间越长，沸石 NaX 的结晶度越高。8 小时或更长的水热处理时间可获得纯相的沸石 NaX。HT0 和 HT4 的结晶度较低，因此，尽管具有相似的表面积、官能团和形态，但 K/HT0 和 K/HT4 所支撑的催化剂生物柴油产量较低（分别为 29.7% 和 43.9%）。以完全结晶的沸石 NaX 为载体的催化剂的生物柴油产量约为 80%。沸石结晶度的提高增加了 K/NaX 的碱性，从而改善了棕榈油酯交换反应的催化性能。

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来源期刊

Journal of Physics and Chemistry of Solids 工程技术-化学综合

CiteScore

7.80

自引率

2.50%

发文量

605

审稿时长

40 days

期刊介绍： The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.