Development of Au/C catalysts by the microwave-assisted method for the selective hydrochlorination of acetylene

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

doi:10.1007/s11144-014-0693-3

Cited by 12 publications

(14 citation statements)

References 24 publications

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“…The acetylene gas then flowed into the catalyst. 10 All the other gases (HCl and N 2 ) were of ultra high purity (>99.9%) and were used without further purification.…”

Section: Methodsmentioning

confidence: 99%

“…Previous literature studies ascribed the activity of the Au-base catalyst to the presence of Au 3+ species, postulating them to be 10 active sites. In order to obtain a correlation on the activity of VCM production with the amount of Au 3+ species clusters made on the catalyst surface, samples were tested for acetylene hydrochlorination at different compositions and were carefully analyzed by H 2 -TPR.…”

Section: Characterization Of In III -Added 1au4cs I /Ac Catalystmentioning

confidence: 99%

“…It is reasonable to conclude that the 5 addition of Cs I and In III can stabilize the catalytic active Au 3+ species and inhibit the reduction of Au 3+ into Au 0 during the preparation process. 10 To check for distinct amounts of Au, In and Cs in the surface and bulk region, XPS and ICP analysis were conducted and the results are summarized in Table 2. Due to the limited escape depth of the photoelectrons, the XPS technique is suitable to study the composition of the material close to the surface.…”

Section: Characterization Of In III -Added 1au4cs I /Ac Catalystmentioning

confidence: 99%

“…HCl-TPD is also used to characterize the active sites for 5 hydrogen chloride adsorption and clarity, the interactions between Au 3+ and the additives such as CsCl and InCl 3 , and further determine the contributions of these interactions to the ability of the catalysts to adsorb hydrogen chloride. It is reported in the literature that the capacity of a catalyst to adsorb hydrogen 10 chloride is associated with its activity and stability. 41 As seen in Fig.…”

Section: Characterization Of In III -Added 1au4cs I /Ac Catalystmentioning

confidence: 99%

“…30 Over 1Au4Cs I /AC catalysts, the maximum conversion of acetylene was 94% and there was only 5% C 2 H 2 conversion loss after 50 h running under the reaction conditions of C 2 H 2 with an hourly space velocity of 740 h -1 . In a more recent report, Dai et al 31 proposed novel Au- 10 Co(III)-Cu(II) trimetallic structured catalysts, and they assessed them for their ability to promote acetylene hydrochlorination. The long-term stability observed in this work indicates that the ternary Au1Co(III)3Cu(II)1/SAC catalyst can maintain high catalytic activity for at least 6513 h at a low GHSV(C 2 H 2 ) of 30 h -1 .…”

Section: Introductionmentioning

confidence: 99%

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Activated carbon supported ternary gold–cesium(i)–indium(iii) catalyst for the hydrochlorination of acetylene

Zhao

Zhang

et al. 2015

Catal. Sci. Technol.

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Commercialization of acetylene hydrochlorination using AuCl 3 catalysts has been impeded by its poor stability. We have been studying CsCl as a promoter, which can improve acetylene hydrochlorination activity as well as have resistance to catalytic deactivation. In III -added to the Au-Cs I /AC catalysts worked as efficient catalysts for the hydrochlorination of acetylene to vinyl chloride. A 10 series of trimetallic catalysts (1AuxIn III 4Cs I /AC with x = 0.5, 1, 2, 3) were prepared and assessed for their ability to promote hydrochlorination of acetylene. The enhancement of stability observed for Au/In III /Cs I weight ratio of 1:1:4 was particularly remarkable. It delivered a stable performance within the conversion of acetylene, reaching more than 92.8% and there was only 3.7% C 2 H 2 conversion loss after 50 h running under the reaction conditions of temperature 180 °C and C 2 H 2 hourly space velocity of 1480 h -1 . 15 Moreover, the 1Au1In III 4Cs I /AC catalyst delivered a stable performance with an estimated lifetime exceeding 6520 h at C 2 H 2 hourly space velocity of 50 h -1 . H 2 -TPR, TEM, HCl-TPD, C 2 H 2 -TPD, XPS and TGA techniques were further applied to reveal the structural information on the Au-In III -Cs I /AC catalysts. The results reveal that the addition of InCl 3 increased the electron density of Au 3+ species via electron transfer from In atoms to Au 3+ center can increase the adsorption of hydrogen chloride and therefore 20 improve the catalytic stability. These results demonstrate that the addition of metal additives CsCl and InCl 3 results in a synergistic effect to enhance the activity and the stability of Au-based catalysts. The excellent catalytic performance of the 1Au1In III 4Cs I /AC catalyst demonstrated its potential as an alternative to mercury chloride catalysts for acetylene hydrochlorination.

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“…The acetylene gas then flowed into the catalyst. 10 All the other gases (HCl and N 2 ) were of ultra high purity (>99.9%) and were used without further purification.…”

Section: Methodsmentioning

confidence: 99%

Section: Characterization Of In III -Added 1au4cs I /Ac Catalystmentioning

confidence: 99%

Section: Characterization Of In III -Added 1au4cs I /Ac Catalystmentioning

confidence: 99%

Section: Characterization Of In III -Added 1au4cs I /Ac Catalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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