نتایج جستجو برای: brønsted acidic

تعداد نتایج: 35712  

Journal: :Journal of the American Chemical Society 2017
Kairat Sabyrov Juncong Jiang Omar M Yaghi Gabor A Somorjai

Exceptionally high surface area and ordered nanopores of a metal-organic framework (MOF) are exploited to encapsulate and homogeneously disperse a considerable amount of phosphotungstic acid (PTA). When combined with platinum nanoparticles positioned on the external surface of the MOF, the construct shows a high catalytic activity for hydroisomerization of n-hexane, a reaction requiring hydroge...

Journal: :organic chemistry research 0
habib ollah foroughi department of scince, islamic azad university, fasa branch ali khalafi-nezhad department of chemistry, shiraz university, shiraz,71454, i.r.iran

the silica boron sulfuric acid nanoparticles (sbsans) as an efficient heterogeneous solid acid catalyst with both brønsted and lewis acidic sites catalyzed the preparation of bis-4-hydroxycoumarin derivatives using reaction of aldehydes and 4-hydroxycoumarin under mild and solvent-free condition at room temperature. this new and efficient methodology has advantages in comparison with currently ...

Journal: :Catalysis Today 2021

The characterization and catalytic performance of Zn/ZSM-5 Zn-B/ZSM-5 catalysts in the n-hexane aromatization was reported. Catalysts were prepared by post-synthesis ion exchange thoroughly characterized means XRD, Py-FTIR, N2 adsorption, 27Al 11B MAS NMR spectroscopy electron microscopy techniques. incorporation zinc reduces Brønsted acid site density increases Lewis acidic sites final ZSM-5 b...

Journal: :Applied Catalysis B-environmental 2023

The huge scale of plastic waste generation and its environmental consequences drive the demands for catalytic upcycling processes. Here, we report efficient polypropylene (PP) hydro-conversion over Ru Ni supported on a sol-gel anatase TiO2 (TiO2-A-SG). A small number Brønsted acid sites TiO2-A-SG enables hydrocracking, improving efficiency, steering selectivity towards high-valued C4-20, allowi...

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