Partial hydrogenation of acetylene using highly stable dispersed bimetallic Pd-Ga/MgO-Al₂O₃ catalyst

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• 作者：Yufei He ; Linlin Liang ; Yanan Liu ; Junting Feng ; Chao Ma ; Dianqing Li
• 关键词：Pd&ndash ; Ga nanoalloys ; In situ LDH precursor route ; Stable dispersion ; Partial hydrogenation of acetylene
• 刊名：Journal of Catalysis
• 出版年：January, 2014
• 年：2014
• 卷：309
• 期：Complete
• 页码：166-173
• 全文大小：2757 K

文摘

An effective and versatile synthetic approach is presented to produce highly dispersed bimetallic Pd-Ga catalysts that can be used as hydrogenation catalysts. Mg-Ga-Al-layered double hydroxide (LDH) was synthesized in situ on the surface of spherical alumina to obtain MgGaAl-LDH@Al₂O₃ precursor, followed by the introduction of . The positive charge of MgGaAl-LDH layer offers an opportunity to realize uniform dispersion of , which facilitates the formation of bimetallic Pd-Ga nanoalloys. Upon thermal reduction of /MgGaAl-LDH@Al₂O₃ precursor, highly stable dispersed bimetallic Pd-Ga/MgO-Al₂O₃ catalysts were obtained. Owing to high dispersion and synergistic effect of bimetallic nanoalloys, Pd-Ga/MgO-Al₂O₃ catalysts exhibited comparable activity and much higher selectivity compared with the monometallic Pd/MgO-Al₂O₃ in partial hydrogenation of acetylene. More significantly, this good catalytic performance can be totally retained after three times recycling due to the net trap confinement effect, which suppressed the migration and aggregation of bimetallic Pd-Ga nanoalloys.