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首页> 外文期刊>Catalysis science & technology >Creation of CuOx/ZSM-5 zeolite complex: healing defect sites and boosting acidic stability and catalytic activity
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Creation of CuOx/ZSM-5 zeolite complex: healing defect sites and boosting acidic stability and catalytic activity

机译：创建CuOx / ZSM-5沸石复杂:愈合缺陷,提高酸性稳定和网站催化活性

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摘要

Modifying zeolite with metal by conventional methods (i.e.impregnation) could produce extra Lewis acidic species (LAS) but at the expense of intrinsic Bronsted acidity (BAS), which affects acid catalytic capability; meanwhile, other inherent problems such as metal leaching, sintering and framework Al removal are sticky issues. In this work, a simple and effective method was carried out to synthesize CuOx/ZSM-5 complex (designed as Z-CuO) by directly transforming CuO nanoparticles into ZSM-5 zeolite in cluster form. The benefits of CuO(x)clusters in zeolite to the acidic structure and stability of ZSM-5 zeolite are demonstrated, showing excellent performance in the hexane cracking reaction. Specifically, nano CuO can be hydrothermally disintegrated into CuO(x)clusters, connecting with the defective silanols inside zeolite. The doped CuO(x)clusters in ZSM-5 zeolite can generate extra LAS without lessening its intrinsic strong BAS, improve acidic and structural stability due to healing of the defective sites, and also protect framework Al from removal. In turn, the Z-CuO complex enhances the stability of CuO(x)clusters with no Cu leaching and sintering under a high-temperature reaction and catalyst regeneration. Finally, Z-CuO performs superhigh hexane conversion and exhibits high selectivity to light olefins and a long catalytic lifetime due to the stable BAS and the defect healing in Z-CuO coupled with extra LAS, leading to suppression of coke deposition.
机译：修改用金属通过传统的沸石(i.e.impregnation)可以产生额外的方法路易斯酸性物种(LAS),但为代价的内在布仑斯惕酸度(BAS)影响酸催化能力;固有的问题,如金属浸出,烧结和框架Al去除粘问题。方法进行了合成CuOx / ZSM-5复杂的(设计成Z-CuO)通过直接改造措ZSM-5沸石纳米粒子在集群的形式。在酸性沸石的结构和稳定性ZSM-5沸石的演示,展示在己烷裂解性能优良的反应。热水地瓦解成措(x)集群、结合缺陷硅醇在里面沸石。沸石可以产生额外的拉斯维加斯没有减少其内在强大的BAS,提高酸性和由于治疗的结构稳定性有缺陷的网站,也保护框架从去除。措(x)集群的稳定性没有铜浸出和高温下烧结反应和催化剂再生。Z-CuO执行超高的转换和正己烷展品轻烯烃和高选择性由于稳定的BAS和催化寿命长Z-CuO加上额外的缺陷愈合拉斯维加斯,导致抑制焦炭沉积。

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