Preparation of Au/C catalysts using microwave-assisted and ultrasonic-assisted methods for acetylene hydrochlorination

Wittanadecha, W.; Laosiripojana, Navadol; Ketcong, Anawat; Ningnuek, Niwat; Praserthdam, Piyasan; Monnier, John R.; Assabumrungrat, Suttichai

doi:10.1016/j.apcata.2014.01.043

Cited by 30 publications

(19 citation statements)

References 21 publications

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“…Our previous work [23] demonstrated by TEM measurements that the CI sample has poor metallic dispersion on catalyst whereas the UL sample has excellent metallic. Typically, the properties of catalysts and their activities are in close relationship to the degree of metal dispersion.…”

Section: Resultsmentioning

confidence: 99%

“…The change in catalytic activity with time is likely to be due to the change in size of gold catalyst by sintering. It was reported earlier that there is an optimum size of gold to catalyze the reaction [23,30]. Fig.…”

Section: Fig 2 H2 -Tpr Profiles Of Gold Catalysts Synthesized By Ulmentioning

confidence: 99%

“…Au/C catalyst was firstly prepared by conventional incipient wetness impregnation technique using aqua regia as a solvent [23]. The activated carbon support (coconut shell based and supplied by Carbokarn) was initially washed with dilute aqueous HCl (1M) (Qrec HCl 37%) to eliminate impurities of acetylene hydrochlorination such as Na or Fe.…”

Section: Catalyst Preparationmentioning

confidence: 99%

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Synthesis of Au/C Catalysts by Ultrasonic-Assisted Technique for Vinyl Chloride Monomer Production

Wittanadecha

Laosiripojana

Ketcong³

et al. 2014

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Abstract. In the present work, the ultrasonic-assisted technique is applied to synthesize Au/C catalysts for vinyl chloride monomer (VCM) production via acetylene hydrochlorination. The catalytic performance of the obtained catalysts is compared with that of the catalyst prepared by a conventional incipient wetness impregnation technique. It was found that all the prepared catalysts show high VCM selectivity (>99.5%). The use of the ultrasonic-assisted technique can significantly improve the catalytic activity and stability of the synthesized Au/C catalysts. An ultrasonic driven time of 6 hours is found to be a promising catalyst for commercial application regarding the catalyst stability. In addition, the effect of operating parameters is investigated. Suitable operating temperature and HCl/C2H2 feed ratio are 180 o C and 1.1, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Fig 2 H2 -Tpr Profiles Of Gold Catalysts Synthesized By Ulmentioning

confidence: 99%

Section: Catalyst Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Au/C Catalysts by Ultrasonic-Assisted Technique for Vinyl Chloride Monomer Production

Wittanadecha

Laosiripojana

Ketcong³

et al. 2014

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“…The catalysts were prepared using the incipient wetness impregnation method, which is known to be the most effective preparation method and guarantees that all of the gold precursor can be loaded onto the supports [3][4][5]10,11,18,24]. However, the XRD patterns show that Cat original and Cat 300 have a stronger gold signal, which indicates larger gold particles.…”

Section: Existence Of Gold In the Aucl 3 /C Catalystsmentioning

confidence: 99%

“…The gold precursor, HAuCl 4 Á4H 2 O, was dissolved in dilute aqua regia (1:9 aqua regia:H 2 O by volume, 16.4 mL), and then the solution was added dropwise with stirring to the pretreated support in order to obtain the catalyst with a final AuCl 3 loading of 1 wt.%. Stirring was continued at ambient temperature for half an hour and then the product was dried for 24 h at 130°C [11,18]. The obtained catalysts are referred to as Cat original , Cat 300 , Cat 600 , Cat 900 , Cat HCl , Cat HF , Cat H2O2 , Cat H2 , and Cat C2H2 according to the supports used in the preparation process.…”

Section: Preparation Of Catalystsmentioning

confidence: 99%

Study of the active site for acetylene hydrochlorination in AuCl3/C catalysts

Chao

Guan

2015

Journal of Catalysis

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Hydrochlorination of Acetylene Over the Activated‐Carbon‐Supported Au Catalysts Modified by N−P−O‐Containing Ligand

Zhang

et al. 2019

ChemCatChem

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Etidronic acid (HEDP) and Nitrilotri(methylphosphonic acid) (ATMP) were selected as heteroatoms-containing ligands to modify Au catalysts for acetylene hydrochlorination. Results from several analytical methods reveal an optimal mole ratio of Au/ligand (L) of 1 : 1, with obvious increments over the Au 1 -L 1 / AC catalyst. The coordination between the Au and the heteroatoms, especially the collocative presence of N, P, and O promoted electron transfer from the heteroatoms to the Au n + and increased the density of the electron cloud around active centers. This stabilized the Au n + and increased the difficulty in the reduction of Au species, and re-oxidized the Au 0 to active Au n + species. Moreover, the coordination inhibited the migration of active components. The increased density of the electron cloud around active centers also weakens the adsorption capacity for C 2 H 2 and strengthens the adsorption ability for HCl of the catalysts, which is conductive for constructing the micro-environment favorable to the reaction. DFT calculations proved the stabilization effect of the heteroatoms-containing ligands, and the energy sequence of the transition states supported the experimental results.

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Preparation of Au/C catalysts using microwave-assisted and ultrasonic-assisted methods for acetylene hydrochlorination

Cited by 30 publications

References 21 publications

Synthesis of Au/C Catalysts by Ultrasonic-Assisted Technique for Vinyl Chloride Monomer Production

Synthesis of Au/C Catalysts by Ultrasonic-Assisted Technique for Vinyl Chloride Monomer Production

Study of the active site for acetylene hydrochlorination in AuCl3/C catalysts

Hydrochlorination of Acetylene Over the Activated‐Carbon‐Supported Au Catalysts Modified by N−P−O‐Containing Ligand

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