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《山东大学学报(理学版)》 ›› 2018, Vol. 53 ›› Issue (11): 9-17.doi: 10.6040/j.issn.1671-9352.0.2018.345

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分级多孔金-铜薄膜对苯甲醇的催化氧化

何淑仁(),唐斌,邢新峰,石春颖,张秀梅,张晓梅,许效红*()   

  1. 山东大学化学与化工学院，山东 济南 250100
  • 收稿日期:2018-06-14 出版日期:2018-11-01 发布日期:2018-11-14
  • 通讯作者: 许效红 E-mail:15154125052@163.com;xhxu@sdu.edu.cn
  • 作者简介:何淑仁(1990—)，男，硕士研究生，研究方向为纳米催化. E-mail:15154125052@163.com
  • 基金资助:
    国家自然科学基金资助项目(21176144);国家自然科学基金资助项目(21472117)

Hierarchically porous Au-Cu thin films as catalysts for aerobic oxidation of benzyl alcohol

Shu-ren HE(),Bin TANG,Xin-feng XING,Chun-ying SHI,Xiu-mei ZHANG,Xiao-mei ZHANG,Xiao-hong XU*()   

  1. School of Chemical and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China
  • Received:2018-06-14 Online:2018-11-01 Published:2018-11-14
  • Contact: Xiao-hong XU E-mail:15154125052@163.com;xhxu@sdu.edu.cn
  • Supported by:
    国家自然科学基金资助项目(21176144);国家自然科学基金资助项目(21472117)

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摘要：

采用合金/去合金法，在金-铜合金线表面制备了分级多孔金-铜薄膜结构(Hierarchically porous Au-Cu thin films，HPAFs)。该分级多孔结构是由微米级的大尺寸孔道-系带和纳米级小尺寸系带-孔道构成。通过对电沉积、退火处理及腐蚀条件的控制可以调控表面多孔薄膜层的厚度、结构以及组成。研究结果表明，脱合金处理残留的铜在富金的系带上形成了金主导的AuCu合金-CuOx异质结构，其可以有效地促进分子氧的活化，而分级多孔结构有利于反应物分子在孔内的扩散传质，从而赋予HPAFs催化剂对苯甲醇分子氧氧化反应高催化活性。

关键词: 表面分级多孔结构, 合金/去合金, Au-Cu, 苯甲醇, 催化氧化

Abstract:

Hierarchically porous Au-Cu thin films (HPAFs) fabricated on Au-Cu alloy wire surface by an alloying/dealloying process are reported, which exhibit superior catalytic performance for benzyl alcohol aerobic oxidation. The porous structure is composed of large-sized ligament channels (several micrometers) coupled with small-sized ligament pores (tens of nanometers), which interpenetrate in the big architecture. The morphology and composition of HPAFs can be easily tailored by altering electrodeposition, pretreatment and corrosion conditions. The characterization reveals that Cu residue in Au-rich ligament created an Au dominated AuCu(alloy)-CuOx heterostruture, which is highly active for molecular oxygen activation and favorable for benzyl alcohol aerobic oxidation. Furthermore, the surface thin-layer hierarchically porous structure of HPAFs enables the decrease in the internal diffusion resistance, and therefore further improves their catalytic performance where the pore diffusion is the rate-limiting step.

Key words: surface hierarchical porous structure, alloying/dealloying, Au-Cu, synergistic catalytic effect, benzyl alcohol aerobic oxidation

中图分类号: 

  • O643.3

图1

HPAFs制备流程图"

图2

HPAFs样品的扫描电镜(SEM)图 a，低放大倍数的HPAFs-9 h的SEM图；b, HPAFs-9 h的SEM截面图；c, HPAFs-1/6 h；d, HPAFs-1 h；e, HPAFs-9 h；f, HPAFs-24 h。"

图3

不同处理阶段样品的X射线粉末衍射(XRD)图 a，原始AuCu合金线；b，电沉积Cu并退火后的AuCu合金线；c，HPAFs-9 h。"

表1

XPS测试分析得到的HPAFs表面的Au/Cu原子比"

HPAFs催化剂 HPAFs-1/6 h HPAFs-1 h HPAFs-9 h HPAFs-24 h
Au/Cu原子比 92：8 94：6 95：5 —

图4

Au 4f在HPAFs- 1/6 h、1 h、9 h和24 h中的XPS图谱"

图5

Cu 2p在HPAFs-1/6 h(a)、HPAFs-1 h(b)、HPAFs-9 h(c)和HPAFs-24 h(d)中的XPS图谱"

图6

HPAFs样品的电化学性能表征 a，原始合金线; b, c，HPAFs-9 h样品开始扫描及达到稳态后; d, e，HPAFs-24 h样品开始扫描及稳定后的在N2吹扫的0.5 mol/L H2SO4溶液中的C-V扫描曲线。扫描速率为20 mV/s。"

图7

HPAFs对苯甲醇氧化的催化性能曲线(反应条件：反应温度280 ℃，氧醇比1.05，总气体流量44 mL/min，苯甲醇进样浓度0.36 mmol/min，催化剂用量20 mg。实心符号为苯甲醇的转化率，空心符号为苯甲醛的选择性)"

图8

HPAFs-9 h样品在280 ℃下反应7 h后的SEM图"

图9

氧气浓度对HPAFs-9 h催化氧化苯甲醇活性的影响(反应温度240 ℃，催化剂用量20 mg，总气体流量44 mL/min，苯甲醇进样浓度0.36 mmol/min)"

图10

苯甲醇进样浓度对HPAFs-9 h催化苯甲醇氧化反应活性的影响(反应条件：氧气体积分数10%，反应温度240 ℃，催化剂用量10 mg)"

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