Pentacoordinated Aluminum Species: New Frontier for Tailoring Acidity-Enhanced Silica–Alumina Catalysts,Accounts of Chemical Research

当前位置： X-MOL 学术 › Acc. Chem. Res. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Pentacoordinated Aluminum Species: New Frontier for Tailoring Acidity-Enhanced Silica–Alumina Catalysts
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2020-10-22 , DOI: 10.1021/acs.accounts.0c00459
Zichun Wang ₁ , Yijiao Jiang ₁ , Alfons Baiker ₂ , Jun Huang ₃

Affiliation

Silica–alumina catalysts, including zeolites and amorphous silica–aluminas (ASAs), are among the most widely used solid acid catalysts and supports to produce petrochemicals, fine chemicals, and renewable energy. The coordination, distribution, and interactions of aluminum in ASAs have an enormous impact on their acidic properties and catalytic performance. Unsaturated tetracoordinated aluminum (Al^IV) species are commonly accepted as the key sites in generating catalytically active Brønsted acid sites (BASs) in silica–alumina catalysts. Extensive efforts focus on increasing the concentration of Al^IV as the main route to enhance their Brønsted acidity for efficient catalysis. However, increasing the Al^IV concentration either weakens the acid strength in zeolites or lowers Brønsted acidity in ASAs at high Al/Si ratios, impeding acidity enhancement of these popular catalysts.

中文翻译：

五元配位的铝物种：定制增强酸性的二氧化硅-氧化铝催化剂的新领域

二氧化硅-氧化铝催化剂，包括沸石和无定形二氧化硅-氧化铝（ASAs），是使用最广泛的固体酸催化剂和载体，可生产石油化工，精细化工和可再生能源。铝在ASA中的配位，分布和相互作用对其酸性和催化性能产生巨大影响。不饱和四配位铝（Al ^IV）物种通常被认为是在二氧化硅-氧化铝催化剂中产生催化活性布朗斯台德酸中心（BASs）的关键位置。广泛的努力集中在增加Al ^IV的浓度上，Al ^IV是提高其Brønsted酸度以进行有效催化的主要途径。但是，增加铝^IV Al / Si比高时，浓度过高会削弱沸石中的酸强度，或降低ASA中的布朗斯台德酸度，从而阻碍了这些常用催化剂的酸度提高。

更新日期：2020-11-17

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11