Heterogeneous Gold Catalysis: From Discovery to Applications

Alshammari, Ahmad S.

doi:10.3390/catal9050402

Cited by 37 publications

(22 citation statements)

References 167 publications

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“…Globally, more than 3.5 million metric tons of adipic acid is produced with an annual growth rate of ca . 5 % [43] . For instance, ∼4.0 million tonnes of caprolactam is produced in 2012 and the annual growth rate is 8 % [44] .…”

Section: Motivation For the Preparation Of Cycloalkanes From Ligninmentioning

confidence: 99%

Recent Catalytic Approaches for the Production of Cycloalkane Intermediates from Lignin‐Based Aromatic Compounds: A Review

Gundekari

Karmee

2021

ChemistrySelect

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Lignin is one of the primary components of lignocellulosic biomass. It is an alternative and sustainable source for aromatic and cyclic hydrocarbons. Lignin is obtained in large quantities as a co‐product in sugar, paper‐pulp, and bioethanol industries. Hydrodeoxygenation/‐hydrogenation of lignin‐based phenolic compounds is an important route to synthesize new generation products. This review focuses on recent catalytic methods for selective conversion of phenolics into cyclohexa(nol/none/ne); which are precursors for emerging polymers and fuels. Furthermore, effect of metal catalysts, supports, and parameters on different reactions were discussed along with possible industrial applications of obtained cycloalkanes. In addition, limitations, advantages, and future scope of hydrodeoxygenation/‐hydrogenation of monolignols are also described.

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Section: Motivation For the Preparation Of Cycloalkanes From Ligninmentioning

confidence: 99%

Recent Catalytic Approaches for the Production of Cycloalkane Intermediates from Lignin‐Based Aromatic Compounds: A Review

Gundekari

Karmee

2021

ChemistrySelect

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“…SPR allows gold NPs to be used as hyperthermia agents due to their capability to absorb light at a given frequency and transforming the energy into heat (Plan Sangnier et al, 2019 ; Balfourier et al, 2020 ). Gold NPs have also been largely used in sensing systems (Zhou et al, 2015 ; De Crozals et al, 2016 ; Szekeres and Kneipp, 2019 ), as contrast agents for computed tomography (CT), as antibacterial agents (Cui et al, 2012 ), and as catalyst (Alshammari, 2019 ; Begum et al, 2019 ).…”

Section: Nano-objectsmentioning

confidence: 99%

Silk Polymers and Nanoparticles: A Powerful Combination for the Design of Versatile Biomaterials

et al. 2020

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Silk fibroin (SF) is a natural protein largely used in the textile industry but also in biomedicine, catalysis, and other materials applications. SF is biocompatible, biodegradable, and possesses high tensile strength. Moreover, it is a versatile compound that can be formed into different materials at the macro, micro- and nano-scales, such as nanofibers, nanoparticles, hydrogels, microspheres, and other formats. Silk can be further integrated into emerging and promising additive manufacturing techniques like bioprinting, stereolithography or digital light processing 3D printing. As such, the development of methodologies for the functionalization of silk materials provide added value. Inorganic nanoparticles (INPs) have interesting and unexpected properties differing from bulk materials. These properties include better catalysis efficiency (better surface/volume ratio and consequently decreased quantify of catalyst), antibacterial activity, fluorescence properties, and UV-radiation protection or superparamagnetic behavior depending on the metal used. Given the promising results and performance of INPs, their use in many different procedures has been growing. Therefore, combining the useful properties of silk fibroin materials with those from INPs is increasingly relevant in many applications. Two main methodologies have been used in the literature to form silk-based bionanocomposites: in situ synthesis of INPs in silk materials, or the addition of preformed INPs to silk materials. This work presents an overview of current silk nanocomposites developed by these two main methodologies. An evaluation of overall INP characteristics and their distribution within the material is presented for each approach. Finally, an outlook is provided about the potential applications of these resultant nanocomposite materials.

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“…3 It should be noted that, for specific applications, AuNPs are normally supported on or surrounded by an oxide, for example, silica. [5][6][7][8] Nanostructured silica presents interesting properties for nanotechnological applications. Silica offers good thermal and chemical stability and biocompatibility, but its surface chemistry is versatile, allowing the functionalization and modulation of its hydrophilicity.…”

Section: Introductionmentioning

confidence: 99%

Atomic Absorption Spectrometry as an Alternative to Determine the Presence of Gold Nanoparticles on or in Silica Matrix

Giertyas¹,

Silva²,

Oliveira³

et al. 2022

J. Braz. Chem. Soc.

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Two different gold-silica-based nanomaterials were prepared: (i) silica-supported gold nanoparticles (AuNP/SiO2); and (ii) gold-silica core-shell nanoparticles (AuNP@SiO2). Three strategies for sample treatment (S), consisting in acid treatments, were employed: (S1) HNO3; (S2) HNO3 + HCl; and (S3) HF + HNO3 + HCl, applying microwave oven digestion for S2 and S3. From three calibration curves, slope, intercept, and linear correlation coefficient were obtained. The accuracy of the methods was evaluated by comparing the gold contents in a sample determined by flame atomic absorption spectrometry (FAAS) and by inductively coupled plasma atomic emission spectrometry (ICP-OES). Finally, the amount of gold for all samples was determined by FAAS. UV-Vis spectroscopy and transmission electron microscopy (TEM) were used to compare the material before and after sample treatment. By comparison, the application of S2 and S3 allowed the presence of gold on or in the silica matrix to be determined and the amount quantified.

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Heterogeneous Gold Catalysis: From Discovery to Applications

Cited by 37 publications

References 167 publications

Recent Catalytic Approaches for the Production of Cycloalkane Intermediates from Lignin‐Based Aromatic Compounds: A Review

Recent Catalytic Approaches for the Production of Cycloalkane Intermediates from Lignin‐Based Aromatic Compounds: A Review

Silk Polymers and Nanoparticles: A Powerful Combination for the Design of Versatile Biomaterials

Atomic Absorption Spectrometry as an Alternative to Determine the Presence of Gold Nanoparticles on or in Silica Matrix

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