Free-Mercury Catalytic Acetylene Hydrochlorination Over Bimetallic Au–Bi/γ-$ Al_{2} $$ O_{3} $:A Low Gold Content Catalyst

Abstract Gold and gold-based bimetallic catalysts for acetylene hydrochlorination were prepared with $ HAuCl_{4} $•$ 4H_{2} $O and $ BiCl_{3} $ as precursors and γ-$ Al_{2} $$ O_{3} $ as the support. Their catalytic performances for acetylene hydrochlorination were tested in a fixed-bed reactor under the fixed reaction conditions of temperature 150 °C, $ C_{2} $$ H_{2} $ hourly space velocity 120 $ h^{−1} $, feed volume ratio V (HCl)/V ($ C_{2} $$ H_{2} $) = 1.05. Then they were analyzed by the characterization methods of BET, XRD, SEM, TG, TPR and XPS. The results showed that the Au/γ-$ Al_{2} $$ O_{3} $ catalyst exhibited a high activity with only 0.1 wt% Au loading but it deactivated easily for both coke deposition and valance change. With the addition of Bi, it inhibited the reduction of $ Au^{3+} $ to $ Au^{0} $ in both the preparation and the reaction process. Besides, the coke deposition was apparently weakened. The best catalytic performance was obtained over 0.1Au5Bi/γ-$ Al_{2} $$ O_{3} $ catalyst with an acetylene conversion of 96 % and a selectivity to VCM of more than 99 % (Au loading, only 0.1 wt%) for running more than 10 h. Graphical Abstract The Au–Bi/γ-$ Al_{2} $$ O_{3} $ catalyst can decrease significantly the Au loading from more than 1 to 0.1 wt% with the satisfied acetylene conversion compared with the activity carbon support. The addition of Bi can inhibited the reduction of $ Au^{3+} $ and coke deposition..

Medienart:

E-Artikel

Erscheinungsjahr:

2014

Erschienen:

2014

Enthalten in:

Zur Gesamtaufnahme - volume:144

Enthalten in:

Catalysis letters - 144(2014), 12 vom: 10. Okt., Seite 2191-2197

Sprache:

Englisch

Beteiligte Personen:

Zhao, Jigang [VerfasserIn]
Cheng, Xiaoguang [VerfasserIn]
Wang, Lei [VerfasserIn]
Ren, Ruofan [VerfasserIn]
Zeng, Junjian [VerfasserIn]
Yang, Henghua [VerfasserIn]
Shen, Benxian [VerfasserIn]

Links:

Volltext [lizenzpflichtig]

BKL:

35.17$jKatalyse

Themen:

γ-Al
Acetylene hydrochlorination
Deactivition
Low gold
O
Support

Anmerkungen:

© Springer Science+Business Media New York 2014

doi:

10.1007/s10562-014-1371-9

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

OLC211216581X

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