CuO@HHSS催化剂制备及催化还原对硝基苯酚性能

doi:10.11962/1006-4990.2020-0424

摘要/Abstract

摘要：

在水热合成复合二氧化硅空心球（HHSS）基础上,以硝酸铜为原料,采用超声辅助浸渍法制备出高分散CuO@HHSS复合催化剂。采用X射线衍射（XRD）、氮气吸附-脱附、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）等表征手段对合成催化剂的形貌和结构进行了表征。结果表明：CuO@HHSS催化剂依然保持HHSS的层次纳米中空结构;CuO颗粒高度分散在HHSS表面,而且复合催化剂具有较高的比表面积（488.9 m²/g）。以对硝基苯酚（4-NP）的催化还原反应作为反应模型,考察了CuO和CuO@HHSS催化剂对4-NP还原的催化性能。结果表明：在不同对硝基苯酚浓度下CuO@HHSS展现出优异的催化性能,在200 s内催化硼氢化钠（NaBH₄）将4-NP转化为对氨基苯酚（4-AP）。

关键词: CuO@HHSS, 高分散, 比表面积, 对硝基苯酚, 催化还原

Abstract:

On the basis of preparing hollow silica sphere（HHSS） by hydrothermal method,CuO@HHSS composite catalysts were prepared with copper nitrate as raw material by ultrasonic assisted-impregnation method.The morphology and structure of the prepared catalyst were characterized by means of X-ray diffraction（XRD）,nitrogen adsorption and desorption,X-ray photoelectron spectroscopy（XPS）,scanning electron microscopy（SEM） and transmission electron microscopy（TEM） etc..Results showed that the CuO@HHSS catalyst still maintained the hierarchical nano hollow structure of HHSS.CuO particles were highly dispersed on the HHSS surface,which showed a high specific surface area（488.9 m²/g）.The catalytic reduction reaction of p-nitrophenol（4-NP） was used as a model reaction to investigate the catalytic performance of CuO and CuO@HHSS catalysts for reduction of 4-NP.The results revealed that CuO@HHSS had excellent catalytic performance at different 4-NP concentrations and catalyze NaBH₄ to convert 4-NP to p-aminophenol（4-AP） within 200 s.

Key words: CuO@HHSS, highly dispersed, high specific surface area, p-nitrophenol, catalytic reduction

中图分类号:

TQ131.21

陈猛,杨万亮,段英男,田蒙奎. CuO@HHSS催化剂制备及催化还原对硝基苯酚性能[J]. 无机盐工业, 2020, 52(12): 92-97.

Chen Meng,Yang Wanliang,Duan Yingnan,Tian Mengkui. Preparation of CuO@HHSS catalyst and its catalytic properties for reduction of p-nitrophenol[J]. Inorganic Chemicals Industry, 2020, 52(12): 92-97.

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催化剂	比表面积/（m²·g^-1）	孔容/（cm³·g^-1）	平均孔径/nm
CuO	2.1	0.011	—
HHSS	752.6	1.750	9.95
CuO@HHSS	488.9	1.058	7.81
SiO₂	237.2	0.842	14.21
CuO@SiO₂	189.4	0.653	11.26

催化剂	速率常数k₁	t_1/2/s	R²
CuO	0.001 8	385.1	0.983
CuO@HHSS	0.016 0	43.3	0.946
CuO@SiO₂	0.006 0	115.5	0.962

c（4-NP）/（mmol·L^-1）	t/s	c（4-NP）/（mmol·L^-1）	t/s
0.10	200	0.05	80
0.08	140	0.01	20

催化剂	完全反应时间/s	催化剂	完全反应时间/s
CuO@HHSS^本文	200	Cu₂O@h-BV^[19]	720
Co-graphene^[18]	480	RGO/Pt-Ni^[20]	1 080

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