Reusability of Mg/Al catalysts for the aldol condensation of furfural and acetone in a continuous flow reactor

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-02-06 DOI:10.1016/j.apcata.2025.120151

Saleem Munir, Daniel Montané, Magdalena Constantí, Francesc Medina

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Abstract

Hydrotalcite catalysts with a Mg: Al ratio of 3:1 were assessed for the aldol condensation of furfural with acetone on a continuous packed bed reactor. The as-prepared (FHT), calcined (CHT), and rehydrated (RHT) hydrotalcites were characterized and their activity was tested at 100 °C and 12 bar(a) with an acetone:furfural ratio of 10:1 at a furfural WHSV of 5.77 h⁻¹. FHT showed low conversion and deactivated fast. CHT and RHT exhibited complete conversion during 2 and 4 h, respectively, and deactivated to a 20 % conversion after 8–11 h. The main products were (E)-4-(furan-2-yl)but-3-en-2-on (C8) and (1E,4E)-1,5-di(furan-2-yl)penta-1,4-dien-3-one (C13). Small amounts of higher molar mass products formed by ketonization were observed, and they were linked to the deposition of insoluble oligomers. Reuse of the spent catalysts by recalcination to remove the organic deposits was evaluated for a total of four reaction tests. A gradual loss of performance was seen after each reactivation treatment.

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连续流反应器中糠醛和丙酮缩醛反应中Mg/Al催化剂的可重复使用性

在连续填充床反应器上，研究了镁铝比为3:1的水滑石催化剂对糠醛与丙酮缩合反应的影响。对制备（FHT）、煅烧（CHT）和再水合（RHT）水滑石进行了表征，并在100°C、12 bar(a)、丙酮：糠醛比为10:1、糠醛WHSV为5.77 h−1的条件下测试了它们的活性。FHT表现为低转化率和快速失活。CHT和RHT分别在2和4 h内完全转化，在8-11 h后失活到20% %的转化率。主要产物为(E)-4-（呋喃-2-基）- 3-烯-2-on （C8）和(1E,4E)-1,5-二（呋喃-2-基）- 1,4-二烯-3-one （C13）。少量高摩尔质量的产物由酮化形成，它们与不溶性低聚物的沉积有关。通过共四次反应试验，评估了通过再煅烧去除有机沉积物的废催化剂的再利用。每次再激活治疗后，表现逐渐下降。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.