☆ 4.6 Article

Metal-doped carbon aerogels as catalysts for the aromatization of n-hexane

APPLIED CATALYSIS A-GENERAL (2011)

期刊

APPLIED CATALYSIS A-GENERAL

卷 408, 期 1-2, 页码 156-162

出版社

ELSEVIER SCIENCE BV

DOI: 10.1016/j.apcata.2011.09.021

关键词

n-Hexane aromatization; Carbon aerogels; Active phase; Acidity; Pre-treatments

类别

Chemistry, Physical Environmental Sciences

资金

Spanish MCIN [CTM2010-18889]

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Protocol

Reagent

摘要

Metal (Cr, Mo, W) - doped carbon aerogels were synthesized from resorcinol-formaldehyde polymerization, characterized textural and chemically and used as aromatization catalysts. Catalytic performance depended on the thermal treatments applied to the samples and on the nature of the metal phases formed (pure carbon is inactive). Only cracking and aromatization reactions were detected and benzene was produced by dehydrogenation and direct 1-6 ring closure. The partial reduction of the metal oxides led to less acidic surfaces enhancing the aromatization versus cracking. Benzene selectivity of 60% without deactivation was obtained. However, when Ni and Co were reduced to the zero valence, strong interactions with the hexane led to a 100% selectivity to methane. (C) 2011 Elsevier B.V. All rights reserved.

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Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar

Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.

APPLIED CATALYSIS A-GENERAL (2024)

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Article Chemistry, Physical

Harnessing reactive hydrogen species via H2O2 photolysis for reduction of CO2 to CH3OH using CaIn2S4@ZnMOF photocatalyst

Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu

Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.

APPLIED CATALYSIS A-GENERAL (2024)

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Article Chemistry, Physical

Numerous active sites in self-supporting Co3O4 nanobelt array for boosted and stabilized 5-hydroxymethylfurfural electro-oxidation

Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang

Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.

APPLIED CATALYSIS A-GENERAL (2024)

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Article Chemistry, Physical

Amorphous silica-alumina modified with silver as an efficient catalyst for vapor-phase dehydration of 1,3-butanediol to 1,3-butadiene

Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato

Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.

APPLIED CATALYSIS A-GENERAL (2024)

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