Crotonaldehyde hydrogenation by gold supported on TiO2: structure sensitivity and mechanism

Zanella, Rodolfo; Louis, Catherine; Giorgio, S.; Touroude, R.

doi:10.1016/j.jcat.2004.01.033

Cited by 255 publications

(91 citation statements)

References 46 publications

(76 reference statements)

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“…Gold has now been employed to hydrogenate reactants ranging from CO, [5] CO 2 , [5] NO x , [6,7] N 2 O, [8] simple alkenes, [9] alkynes [2,10,11] and alkadienes [2,12] to more complex systems, that is, a,b-unsaturated aldehydes, ketones and polyaromatics. [4,[12][13][14][15][16][17] Moreover, recent publications [18][19][20] have established selectivity in the batch liquid-phase hydrogenation of nitroarenes. Here, we compare for the first time the action of Au/TiO 2 with that of Au/Al 2 O 3 in the selective gas-phase hydrogenation of p-chloronitrobenzene (p-CNB) and consider also the reactivity of the ortho and meta isomers.…”

Section: Introductionmentioning

confidence: 99%

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

2008

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The gas-phase continuous hydrogenation of p-chloronitrobenzene (p-CNB) over 1 mol% Au/TiO2 and Au/Al2O3 was compared for the first time. Both catalysts exhibit 100% selectivity in terms of -NO2 group reduction, resulting in the sole formation of p-chloroaniline (p-CAN). Au/TiO2 exhibited a narrower particle size (1-10 nm) distribution than Au/Al2O3 (1-20 nm) and a smaller surface-area-weighted mean Au size (6 nm versus 9 nm). Au/TiO2 delivered a higher specific hydrogenation rate (by a factor of up to four), a response that is discussed in terms of Au particle size and a possible contribution of the support to p-CNB activation. A CNB isomer reactivity sequence was established, that is, o> p> m, which is attributed to resonance stabilisation effects. The results presented establish a basis for the development of a sustainable alternative route for the production of haloamines.

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Section: Introductionmentioning

confidence: 99%

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

2008

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“…This is shown in Figure 1 representing the growing trend in term of publications per year involving gold-based catalytic materials and the use of environmental microscopies. Regarding the evolution of the number of studies using gold-based catalysts, the major part of the scientific publications concern the methods used for the deposition of gold nanoparticles with very narrow and well-defined sizes [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. Besides conflicting papers on the influence of the support materials, the effect of the size on the reactivity of gold catalysts for environmental reactions is well established.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

et al. 2017

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Abstract:Since the early discovery of the catalytic activity of gold at low temperature, there has been a growing interest in Au and Au-based catalysis for a new class of applications. The complexity of the catalysts currently used ranges from single crystal to 3D structured materials. To improve the efficiency of such catalysts, a better understanding of the catalytic process is required, from both the kinetic and material viewpoints. The understanding of such processes can be achieved using environmental imaging techniques allowing the observation of catalytic processes under reaction conditions, so as to study the systems in conditions as close as possible to industrial conditions. This review focuses on the description of catalytic processes occurring on Au-based catalysts with selected in situ imaging techniques, i.e., PEEM/LEEM, FIM/FEM and E-TEM, allowing a wide range of pressure and material complexity to be covered. These techniques, among others, are applied to unravel the presence of spatiotemporal behaviours, study mass transport and phase separation, determine activation energies of elementary steps, observe the morphological changes of supported nanoparticles, and finally correlate the surface composition with the catalytic reactivity.

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“…Consequently, great efforts have been made to maximize the surface area of the catalysts by distributing them over their supports. Numerous researchers have attempted to develop a method of building highly dispersed and stably supported catalysts (Kikuchi et al, 1997;Zanella et al, 2004;Basagiannis et al, 2008;Sunagawa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Preparation of Porous Titania by Sol–Gel Method Using Alkylketene Dimers as a Template

Takahashi

Matsumoto

Horie

et al. 2017

J. Chem. Eng. Japan / JCEJ

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Porous titania (TiO 2 ) particles were prepared using a sol-gel technique employing Alkylketene Dimers (AKD) as a template. The e ects of incremental additions of AKD as a template material on crystal structure, surface and internal morphology, and pore properties were investigated using X-ray di raction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption/desorption. The prepared titania had more than one pore size on its surface and internally. Incremental addition of AKD caused an increase in speci c surface area. The prepared porous titania with the addition of AKD at 5 wt% exhibited a high speci c surface area of 124 m 2 /g, which is markedly higher than in titania without AKD (53.5 m 2 /g). To quantitatively evaluate the porous structure, we performed fractal analysis over a wide scale using box-counting, small X-ray scattering (SAXS) and the FHH (Frenkel-Halsey-Hill) method. Porous titania showed fractal properties, both on its surface and internally.

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Crotonaldehyde hydrogenation by gold supported on TiO2: structure sensitivity and mechanism

Cited by 255 publications

References 46 publications

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

Preparation of Porous Titania by Sol–Gel Method Using Alkylketene Dimers as a Template

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Crotonaldehyde hydrogenation by gold supported on TiO2: structure sensitivity and mechanism

Cited by 255 publications

References 46 publications

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO2 and Au/Al2O3

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO2 and Au/Al2O3

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

Preparation of Porous Titania by Sol–Gel Method Using Alkylketene Dimers as a Template

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Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃

Exclusive Production of Chloroaniline from Chloronitrobenzene over Au/TiO₂ and Au/Al₂O₃