نتایج جستجو برای: hierarchical zeolites

تعداد نتایج: 96710  

Journal: :Journal of the American Chemical Society 2015

2015
Yuanyuan Yue Haiyan Liu Pei Yuan Chengzhong Yu Xiaojun Bao

Iron-modified ZSM-5 zeolites (FeZSM-5s) have been considered to be a promising catalyst system to reduce nitrogen oxide emissions, one of the most important global environmental issues, but their synthesis faces enormous economic and environmental challenges. Herein we report a cheap and green strategy to fabricate hierarchical FeZSM-5 zeolites from natural aluminosilicate minerals via a nanosc...

Journal: :Chemical Society reviews 2016
D Verboekend N Nuttens R Locus J Van Aelst P Verolme J C Groen J Pérez-Ramírez B F Sels

Faujasite (X, Y, and USY) zeolites represent one of the most widely-applied and abundant catalysts and sorbents in the chemical industry. In the last 5 years substantial progress was made in the synthesis, characterisation, and catalytic exploitation of hierarchically-structured variants of these zeolites. Hererin, we provide an overview of these contributions, highlighting the main advancement...

2016
Andreas Martin Keith Hohn

The Special Issue “Zeolite Catalysis” published in the online journal Catalysts was recently successfully completed. A good number of peer-reviewed publications were published reflecting the broadness of the zeolite syntheses, characterizations and various application fields. This issue brought together recent research of well-known research teams from all over the world. The term “zeolite” is ...

Journal: :Physical chemistry chemical physics : PCCP 2013
M M Faruque Hasan Eric L First Christodoulos A Floudas

A hierarchical computational approach is introduced that combines materials screening with process optimization. This approach leads to novel materials for cost-effective CO2 capture. Zeolites are screened using shape, size, and adsorption selectivities. Next, process optimization is introduced to generate a rank-ordered list based on total cost of capture and compression. We not only select th...

2016
Guannan Li Haibo Huang Bowen Yu Yun Wang Jiawei Tao Yingxu Wei Shougui Li Zhongmin Liu Yan Xu Ruren Xu

Hierarchical zeolite monoliths with multimodal porosity are of paramount importance as they open up new horizons for advanced applications. So far, hierarchical zeolites based on nanotube scaffolds have never been reported. Inspired by the organization of biominerals, we have developed a novel precursor scaffolding-solid phase crystallization strategy for hierarchical zeolites with a unique nan...

Journal: :Catalysts 2022

To reveal the influence of acid sites with different spatial locations USY zeolite micro-/mesoporous structures and Si/Al ratio, catalytic cracking methylcyclohexane on zeolites is employed to study synergism effects porous (“active region”) in hierarchical zeolites. The results showed that have increased numbers accessibly strong Brønsted greatly enhanced diffusion ability due pore-structure, ...

Journal: :ChemSusChem 2013
Pierre Y Dapsens Cecilia Mondelli Javier Pérez-Ramírez

Desilication of commercial MFI-type (ZSM-5) zeolites in solutions of alkali metal hydroxides is demonstrated to generate highly selective heterogeneous catalysts for the aqueous-phase isomerization of biobased dihydroxyacetone (DHA) to lactic acid (LA). The best hierarchical ZSM-5 sample attains a LA selectivity exceeding 90 %, which is comparable to that of the state-of-the-art catalyst (i.e.,...

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