Citation: WANG Zhan-Qi, ZHOU Zhi-Ming, ZHANG Rui, LI Li, CHENG Zhen-Min. Selective Hydrogenation of Phenylacetylene over Pd-Cu/γ-Al₂O₃ Catalysts[J]. Acta Physico-Chimica Sinica, ;2014, 30(12): 2315-2322. doi: 10.3866/PKU.WHXB201410152 shu

Selective Hydrogenation of Phenylacetylene over Pd-Cu/γ-Al₂O₃ Catalysts

1.
1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China;
2. Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, East China University of Science and Technology, Shanghai 200237, P. R. China;
3. Institute of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

Received Date: 20 August 2014
Available Online: 15 October 2014
Fund Project: 教育部新世纪优秀人才支持计划(NCET-13-0801) (NCET-13-0801)中央高校基本科研业务费(222201313011)资助 (222201313011)

A two-step method combining colloid synthesis and incipient wetness impregnation was developed for the preparation of bimetallic Pd-Cu/γ-Al₂O₃ catalysts, with the aim of increasing the selectivity to styrene in the selective hydrogenation of phenylacetylene. The structural properties of the catalysts were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), CO-pulse chemisorption, N₂ physisorption, and inductively coupled plasma atomic emission spectrometry (ICPAES). The effects of changing the Cu/Pd molar ratio, the Pd loading, and the order in which the Pd and Cu were introduced into the catalysts on the catalytic activity and selectivity were investigated. The results showed that Pd-Cu/γ-Al₂O₃ exhibited much higher selectivity toward styrene than Pd/γ-Al₂O₃. In particular, Pd-Cu/γ-Al₂O₃ with a Pd loading of 0.3%(w) and a Cu/Pd molar ratio of 0.6 displayed excellent performance at 40℃under 0.1 MPa H₂, with a high selectivity of 95% at a conversion of 90%, and a selectivity of approximately 82%, even at conversions of higher than 99%. The increased selectivity of Pd-Cu/γ- Al₂O₃ was ascribed mainly to the geometrical effects of the Pd-Cu bimetallic alloys, rather than the electronic effects, since no electron transfer occurred between Pd and Cu.
- Pd-Cu/γ-Al₂O₃,
- Selective hydrogenation,
- Phenylacetylene,
- Styrene,
- Structureperformance relationship
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沈阳化工大学材料科学与工程学院沈阳 110142

Selective Hydrogenation of Phenylacetylene over Pd-Cu/γ-Al2O3 Catalysts

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Selective Hydrogenation of Phenylacetylene over Pd-Cu/γ-Al₂O₃ Catalysts