开发用于从原油合成轻质烯烃的分层 ZSM-11

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2024-11-16 DOI:10.1016/j.jaap.2024.106870

Muhammad Waqas , Ziyauddin S. Qureshi , M. Abdullbari Siddiqui , Abdullah Aitani , Aaron C. Akah

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引用次数: 0

摘要

ZSM-11 被认为是各种工业过程中的形状选择性催化剂；然而，分层 ZSM-11 在原油直接转化为轻质烯烃过程中的重要性仍有待探索。在此，我们报告了一种模板指导的水热法，用于合成具有不同次生中孔尺寸、酸度和形态的分层 ZSM-11 沸石。合成策略控制了 SiO2/Al2O3 摩尔比为 30、35 和 70 的均匀纳米棒或堆积纳米沸石的发展。所开发的二维 10 元环直通道 ZSM-11 催化剂首先用于轻质原油的蒸汽催化裂化，以生产轻质烯烃（C2-C4）。在开发的各种催化剂中，SiO2/Al2O3 摩尔比为 35 的分层沸石 ZSM-11(35)在原油裂解转化率（66.5%）和 C2-C4 轻质烯烃选择性（44.1%）方面表现优异。与 ZSM-5 的正弦通道扩散相比，ZSM-11 沸石具有曲折的直通道，有利于在焦炭沉积较少的情况下实现快速的质量传输。

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Development of hierarchical ZSM-11 for synthesis of light olefins from crude oil

ZSM-11 is recognized as a shape-selective catalyst in various industrial processes; however, the significance of hierarchical ZSM-11 in the direct conversion of crude oil to light olefins remains unexplored. Herein, we report a template-directed hydrothermal method to synthesize hierarchical ZSM-11 zeolite with varying secondary mesopore sizes, acidities, and morphologies. The synthesis strategy controlled the development of uniform nanorods or accumulating nanosized zeolites with SiO₂/Al₂O₃ molar ratios of 30, 35, and 70. The developed two-dimensional 10-membered ring straight channels ZSM-11 catalyst were employed firstly for the steam catalytic cracking of light crude oil to produce light olefins (C₂-C₄). Amongst the various developed catalysts, ZSM-11(35), a hierarchical zeolite with SiO₂/Al₂O₃ molar ratio of 35, outperformed in terms of crude oil cracking conversion (∼66.5 %) and selectivity to C₂-C₄ light olefins (44.1 %). In comparison to diffusion over sinusoidal channels in ZSM-5, ZSM-11 zeolite with tortuous and straight channels facilitated rapid mass transport at low coke deposition.

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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.