Study the implication of different SiO2/Al2O3 ratios on the pore size and acidity of Beta zeolite and its catalytic pyrolysis mechanism of Kraft lignin

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL Journal of Analytical and Applied Pyrolysis Pub Date : 2024-09-10 DOI:10.1016/j.jaap.2024.106730

Shibo Han , Xilai Yan , Han Han , Weijie Lin , Hongshen He , Jie Xie , Ajoy Kanti Mondal , Qiuxia Zou , Fang Huang

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Abstract

This study employed a one-step synthesis method to prepare Beta zeolites (BZs) with various SiO₂/Al₂O₃ ratios and applied them as catalysts in the process of producing bio-oil from Kraft lignin (KL). The research investigated the changes in acidity and pore size of BZs under different SiO₂/Al₂O₃ ratios and their impact on the catalytic pyrolysis products of KL. Characterization and a series of physicochemical analyses of BZ with different SiO₂/Al₂O₃ ratios as well as catalytic pyrolysis products were carried out. The Pearson correlation coefficient was also used to correlate BZ SiO₂/Al₂O₃ ratios and the acidity/pore size of BZ as well as the distribution of the products and the deoxygenation effect. The results indicate that BZs with different SiO₂/Al₂O₃ ratios can effectively catalyze the upgrading of KL during pyrolysis. BZ with SiO₂/Al₂O₃ ratios of 45 exhibited stronger acidity, a more prominent layered porous structure, and a more orderly distribution of mesopores. It showed the best catalytic upgrading effect on KL, achieving a product yield of 58.4 %. More prominently, the oxygen content is reduced to 14.19 % and the deoxygenation extent of the heavy oil reached 37.1 %.

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研究不同 SiO2/Al2O3 比率对 Beta 沸石孔径和酸度的影响及其催化热解牛皮纸木质素的机理

本研究采用一步合成法制备了不同 SiO2/Al2O3 比例的 Beta 沸石 (BZs)，并将其作为催化剂应用于利用牛皮纸木质素 (KL) 生产生物油的过程中。研究调查了不同 SiO2/Al2O3 比例下 BZs 酸度和孔径的变化及其对 KL 催化热解产物的影响。对不同 SiO2/Al2O3 比的 BZ 以及催化热解产物进行了表征和一系列理化分析。还利用皮尔逊相关系数对 BZ 的 SiO2/Al2O3 比率和 BZ 的酸度/孔径以及产物的分布和脱氧效果进行了相关分析。结果表明，不同 SiO2/Al2O3 比率的 BZ 可在热解过程中有效催化 KL 的升级。SiO2/Al2O3比为45的BZ具有更强的酸性、更突出的层状多孔结构和更有序的中孔分布。它对 KL 的催化升级效果最好，产品收率达到 58.4%。更突出的是，氧含量降低到 14.19%，重油脱氧程度达到 37.1%。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.