MIL-53 (Al) derived single-atom Rh catalyst for the selective hydrogenation of m-chloronitrobenzene into m-chloroaniline
نویسندگان
چکیده
The catalytic hydrogenation of halonitroarenes to haloanilines is a green and sustainable process for the production key nitrogen-containing intermediates in fine chemical industry. Chemoselective poses significant challenge, which requires rational design catalysts with proper ability nitro group simultaneously preventing dehalogenation halogen group. Herein, highly effective Rh@Al 2 O 3 @C single-atom catalyst (SAC) was developed m -chloronitrobenzene ( -CNB) -chloroaniline -CAN), through an in-situ grafting metal during assembly MIL-53 (Al), followed by confined pyrolysis. Extensive characterizations reveal exquisite structure @C, containing atomically dispersed Rh sites onto Al amorphous carbon. five-coordinated aluminum (Al V ) species are essential achieving atomic dispersion atoms, providing unsaturated coordinative metal. Compared benchmark Rh/γ-Al Rh/C nanocatalysts, SAC affords excellent turnover frequency 2317 mol -CNB ·mol –1 ·h , highest value date heterogeneous systems at 313 K 20 bar H together sustained selectivity -CAN (~98%) five consecutive runs. superior performance attributed modulation electronic forming SAC, enhanced accessibility acid function sites. Rh@Al2O3@C fabricated utilizing metal-organic framework shows excellent, chemoselectivity m-chloronitrobenzene.
منابع مشابه
Solvent-free selective hydrogenation of chloronitrobenzene to chloroaniline over a robust Pt/Fe3O4 catalyst.
In the absence of solvent, highly selective hydrogenation of o-chloronitrobenzene and m-chloronitrobenzene, with selectivity to the corresponding chloroanilines of ≥99.4% and complete conversion of the substrates, was realized over a robust Pt/Fe(3)O(4) catalyst which was prepared by adsorbing Pt nanoclusters on a Fe(3)O(4) support.
متن کاملThermally stable single atom Pt/m-Al2O3 for selective hydrogenation and CO oxidation
Single-atom metal catalysts offer a promising way to utilize precious noble metal elements more effectively, provided that they are catalytically active and sufficiently stable. Herein, we report a synthetic strategy for Pt single-atom catalysts with outstanding stability in several reactions under demanding conditions. The Pt atoms are firmly anchored in the internal surface of mesoporous Al2O...
متن کاملSelective Hydrogenation of m-Dinitrobenzene to m-Nitroaniline over Ru-SnOx/Al2O3 Catalyst
Series catalysts of Ru-SnOx/Al2O3 with varying SnOx loading of 0–3 wt% were prepared, and their catalytic activity and selectivity have been discussed and compared for the selective hydrogenation of m-dinitrobenzene (m-DNB) to m-nitroaniline (m-NAN). The Ru-SnOx/Al2O3 catalysts were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron mi...
متن کاملIn-Situ Liquid Hydrogenation of m-Chloronitrobenzene over Fe-Modified Pt/Carbon Nanotubes Catalysts
In-situ liquid-phase hydrogenation of m-chloronitrobenzene (m-CNB) based on aqueous-phase reforming (APR) of ethanol and catalytic hydrogenation was carried out over Fe-modified Pt/carbon nanotubes (CNTs) catalysts. The effects of Pt loading over CNTs and Fe modification on the catalytic performance of Pt/CNTs catalysts were studied. In-tube loading of Pt particles, compared with out-tube loadi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Chinese Journal of Catalysis
سال: 2021
ISSN: ['0253-9837', '1872-2067']
DOI: https://doi.org/10.1016/s1872-2067(20)63697-x