Unique Catalytic Performance of Supported Gold Nanoparticles in Oxidation

Yu, Yunbo; Huang, Jiahui; Ishida, Tamao; Haruta, Masatake

doi:10.1002/9783527627547.ch3

Cited by 5 publications

(3 citation statements)

References 194 publications

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“…[45][46][47][48][49] The reader is referred to monographs and reviews for a deep coverage in this field. 50,51 In heterogeneous catalysis by gold, one issue of large importance but still poorly understood is the interaction between the gold nanoparticle and the support. Thus, it is very well established that the catalytic activity of gold depends on a very large extent on the nature of the support.…”

Section: Doping Versus Gold Nanoparticle Depositionmentioning

confidence: 99%

Titania supported gold nanoparticles as photocatalyst

Primo

Corma

Garcı́a

2011

Phys. Chem. Chem. Phys.

666

487

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This Perspective is focused on the photocatalytic activity of gold nanoparticles supported on titania (Au/TiO(2)). Titania is the most widely used photocatalyst, but its limited activity under visible light irradiation has motivated the quest for modified titania materials absorbing visible light. The review starts by justifying how doping with metallic elements is a related strategy, but different, to that leading to the use of Au/TiO(2) in photocatalysis. Data supporting and confirming the photoactivity of gold nanoparticles in colloidal solutions are briefly presented to justify the possibility of gold photosensitization of titania by electron injection into the conduction band. After describing the most common procedures used to prepare Au/TiO(2), the central part of this article is focused on the photocatalytic activity reported for Au/TiO(2) for hydrogen generation, dye decoloration, phenol decomposition and carboxylic acid degradation, among other processes. Emphasis is given to the role that parameters like Au loading, particle size, surface area, spatial structuring and others play on the photocatalytic activity. One important issue has been to distinguish those reports using visible light from those other in which direct titania excitation by UV light has been used. These Au/TiO(2) photocatalysts can find real applications in the near future for environmental remediation and for hydrogen generation.

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Section: Doping Versus Gold Nanoparticle Depositionmentioning

confidence: 99%

Titania supported gold nanoparticles as photocatalyst

Primo

Corma

Garcı́a

2011

Phys. Chem. Chem. Phys.

666

487

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“…The application of unconventional oxidants instead of molecular oxygen opens new opportunities in this field. In particular, industrial processes of propylene epoxidation with tert -butyl hydroperoxide, cumene hydroperoxide or hydrogen peroxide have been implemented in recent decades. ,− However, all these processes require the use of special catalysts. This involves a number of problems related to their chemical stability, deactivation, regeneration, separation from the reaction mixture, periodic replacement, etc.…”

Section: Introductionmentioning

confidence: 99%

Gas-Phase Oxidation of a Propane–Propylene Mixture by Nitrous Oxide

Дубков

Parfenov

Харитонов

2020

Ind. Eng. Chem. Res.

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The present study focuses on a new method for obtaining C2−C3 carbonyl compounds (ketones and aldehydes) by the gas-phase selective oxidation of a propane−propylene mixture using nitrous oxide (N 2 O). The oxidation is carried out without catalyst in the temperature range of 623−773 K at elevated pressure. The obtained results reveal that only propylene in the propane− propylene mixture reacts with nitrous oxide. The reaction proceeds by the nonradical mechanism involving the 1,3-dipolar cycloaddition of N 2 O to the CC double bond of olefin. The main reaction products are acetone, propanal, and acetaldehyde. At 723 K and a pressure of 0.7 MPa, the total selectivity to these products amounts to 74.6%, the N 2 O conversion attains 74.5%, and the propylene conversion is 12.5%. An important feature of the reaction is the additional formation of methylcyclopropane with a selectivity of ca. 6%.

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“…55 The key feature of this catalyst is the ability to activate the carbonyl bond by means of the Sn Lewistype properties, thus allowing the formation of the Criegee intermediate by using non-activated HP, that is, with no need for the formation of the Me-OOH active specie: 56 an event that usually occurs with Ti(IV), W(VI) or Nb(V) based systems. (b) Supported Au catalysts, which are active not only in lowtemperature CO oxidation (PROX reaction) or in combustion of volatile organic compounds, but also in selective oxidation reactions, 57,58 such as (i) the gas-phase oxidation of aliphatic alkanes with a O 2 +H 2 mixture, e.g. isobutane to t-butanol, on bifunctional Au/Ti-MCM-41; 59 (ii) the gas-phase oxidation of primary and secondary aliphatic alcohols to the corresponding aldehydes and ketones with oxygen, on Au-SiO 2 ; 60 (iii) the gas-phase epoxidation of propene with O 2 +H 2 on Au-TiO 2 (or Au-TS1); 61 (iv) the liquid-phase oxidation of alcohols with oxygen, e.g.…”

Section: Objectives Reached: Some Examplesmentioning

confidence: 99%

Catalytic selective oxidation faces the sustainability challenge: turning points, objectives reached, old approaches revisited and solutions still requiring further investigation

Cavani

2010

J of Chemical Tech & Biotech

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This review documents some examples of recently developed technologies and new approaches currently being investigated in the field of catalytic selective oxidation, that may contribute to improving the sustainability of the chemical industry. Tools to reach this ambitious target include process integration, the development of new reactions for the valorization of renewables and new catalysts able to perform complex transformations in a single step.

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Unique Catalytic Performance of Supported Gold Nanoparticles in Oxidation

Cited by 5 publications

References 194 publications

Titania supported gold nanoparticles as photocatalyst

Titania supported gold nanoparticles as photocatalyst

Gas-Phase Oxidation of a Propane–Propylene Mixture by Nitrous Oxide

Catalytic selective oxidation faces the sustainability challenge: turning points, objectives reached, old approaches revisited and solutions still requiring further investigation

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