甲醇供氢体系铜锌双金属催化糠醛加氢转化

doi:10.16085/j.issn.1000-6613.2022-0952

化工进展 ›› 2023, Vol. 42 ›› Issue (3): 1341-1352.DOI: 10.16085/j.issn.1000-6613.2022-0952

甲醇供氢体系铜锌双金属催化糠醛加氢转化

萧垚鑫¹^,²(), 张军²^,³^,⁴(), 胡升⁵, 单锐²^,³^,⁴, 袁浩然²^,³^,⁴(), 陈勇¹^,²^,³^,⁴

^1.华南农业大学生物质工程研究院，广东广州 510642
^2.中国科学院广州能源研究所，广东广州 510640
^3.中国科学院可再生能源重点实验室，广东广州 510640
^4.广东省新能源和可再生能源研究开发与应用重点实验室，广东广州 510640
^5.中国科学技术大学工程科学学院，安徽合肥 230026

收稿日期:2022-05-23 修回日期:2022-11-22 出版日期:2023-03-15 发布日期:2023-04-10
通讯作者: 袁浩然
作者简介:萧垚鑫（1998—），男，硕士研究生，研究方向为生物质高值资源化利用。E-mail：2252164032@qq.com
张军（1987—），男，博士，副研究员，研究方向为有机固废/农林废弃生物质高值资源化利用。E-mail：zhagnjun@ms.giec.ac.cn。
基金资助:
国家自然科学基金面上项目(51976222);能源清洁利用国家重点实验室开放基金课题(ZJU-CEU2020023)

Cu-Zn catalyzed hydrogenation of furfural with methanol as hydrogen donor

XIAO Yaoxin¹^,²(), ZHANG Jun²^,³^,⁴(), HU Sheng⁵, SHAN Rui²^,³^,⁴, YUAN Haoran²^,³^,⁴(), CHEN Yong¹^,²^,³^,⁴

^1.Institute of Biomass Engineering, South China Agricultural University, Guangzhou 510642, Guangdong, China
^2.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), Guangzhou 510640, Guangdong, China
^3.CAS Key Laboratory of Renewable Energy, Guangzhou 510640, Guangdong, China
^4.Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, Guangdong, China
^5.School of Engineering Science, University of Science and Technology of China, Hefei 230026, Anhui, China

Received:2022-05-23 Revised:2022-11-22 Online:2023-03-15 Published:2023-04-10
Contact: YUAN Haoran

摘要/Abstract

摘要：

以Cu(NO₃)₂·3H₂O、Zn(NO₃)₂·6H₂O为原料，采用共沉淀法合成了一系列铜锌双金属催化材料。通过电感耦合等离子体发射光谱（ICP-OES）、X射线衍射（XRD）、氮气等温吸附-脱附、扫描电子显微镜（SEM）、氨气程序升温脱附（NH₃-TPD）、氢气程序升温还原（H₂-TPR）、X射线光电子能谱（XPS）、热重/差热分析（TG/DTA）等手段分析表征了催化剂物理化学特性。催化材料表征结果表明，载体Zn组分的引入显著改善了催化剂结构，形成了丰富的介孔结构和部分酸性位点。甲醇供氢体系糠醛加氢转化实验结果显示，合成的Cu-Zn双金属催化剂在甲醇重整产氢和糠醛加氢反应中表现出优异的活性，其中Cu/Zn摩尔比为0.6的CZ-0.60催化活性最高。当CZ-0.60用量为20mg，在160℃反应4h，糠醛完全转化，糠醇产率达89.7%；而在240℃反应8h，糠醛完全转化，2-甲基呋喃产率达26.3%。CZ-0.60在循环使用过程中仍表现出较好的催化活性，热重分析表明回用的CZ-0.60在750℃下具有良好的热稳定性能。基于上述研究结果，本文提出了甲醇供氢体系铜锌双金属催化糠醛加氢转化可能反应路径。

关键词: 糠醛, 甲醇, 催化加氢, 糠醇, 2-甲基呋喃

Abstract:

Using Cu(NO₃)₂·3H₂O and Zn(NO₃)₂·6H₂O as the precursors, we prepared a series of Cu-Zn catalysts by co-precipitation method. The physicochemical properties of the as-prepared Cu-Zn catalysts were characterized through inductively coupled plasma optical emission spectrometers (ICP-OES), X-ray diffraction (XRD), N₂-adsorption/desorption, scanning electron microscopy (SEM), NH₃-temperature programmed desorption (NH₃-TPD), H₂-temperature programmed reduction (H₂-TPR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric/differential thermal analysis (TG/DTA), etc. The introduction of Zn prompted the formation of mesoporous structure and certain amounts of acid sites. The experimental results showed that the synthesized Cu-Zn catalysts exhibited excellent catalytic performance for methanol reforming and furfural hydrogenation, among which CZ-0.60 with Cu/Zn molar ratio of 0.6 gave the highest catalytic performance. The yield of furfuryl alcohol reached 89.7% with 100% furfural conversion at 160℃ for 4h, while that of 2-methylfuran reached 26.3% with complete furfural conversion at 240℃ for 8h. Moreover, CZ-0.60 still maintained good activity in recycling experiments, and showed good thermal stability below 750℃. Furthermore, the possible pathway for furfural hydrogenation using methanol as hydrogen donor over Cu-Zn was proposed.

Key words: furfural, methanol, catalytic hydrogenation, furfuryl alcohol, 2-methylfuran

中图分类号:

TQ251.1

萧垚鑫, 张军, 胡升, 单锐, 袁浩然, 陈勇. 甲醇供氢体系铜锌双金属催化糠醛加氢转化[J]. 化工进展, 2023, 42(3): 1341-1352.

XIAO Yaoxin, ZHANG Jun, HU Sheng, SHAN Rui, YUAN Haoran, CHEN Yong. Cu-Zn catalyzed hydrogenation of furfural with methanol as hydrogen donor[J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1341-1352.

图/表 16

表1 样品中实际金属含量及摩尔比

组别	前体溶液的Cu/Zn比	Cu浓度 /mol·L^-1	Zn浓度 /mol·L^-1	Cu/Zn	简记
1	0.25	0.90	4.04	0.22	CZ-0.22
2	0.43	1.28	3.39	0.38	CZ-0.38
3	0.67	1.78	2.96	0.60	CZ-0.60
4	1.00	2.19	2.44	0.90	CZ-0.90
5	1.50	2.79	2.04	1.30	CZ-1.30

图1 CuO和Cu-Zn双金属催化剂XRD图谱

图2 不同Cu/Zn摩尔比催化剂N2吸附-脱附等温线

表2 铜锌双金属催化剂比表面积、孔容及孔径信息

样品	比表面积/m²·g^-1	孔容/m³·g^-1	孔径/nm
CZ-0.22	113.59	6.97 $×$ 10^-1	3.42
CZ-0.38	46.67	2.66 $×$ 10^-1	17.07
CZ-0.60	51.96	2.62 $×$ 10^-1	15.35
CZ-0.90	38.07	1.83 $×$ 10^-1	15.31
CZ-1.30	48.25	2.36 $×$ 10^-1	16.57

表2 铜锌双金属催化剂比表面积、孔容及孔径信息

样品	比表面积/m²·g^-1	孔容/m³·g^-1	孔径/nm
CZ-0.22	113.59	6.97 $×$ 10^-1	3.42
CZ-0.38	46.67	2.66 $×$ 10^-1	17.07
CZ-0.60	51.96	2.62 $×$ 10^-1	15.35
CZ-0.90	38.07	1.83 $×$ 10^-1	15.31
CZ-1.30	48.25	2.36 $×$ 10^-1	16.57

图3 Cu-Zn双金属催化剂SEM图

图4 Cu-Zn双金属催化剂NH3-TPD谱图

图5 CuO和Cu-Zn双金属催化剂H2-TPR曲线

图6 催化剂CZ-0.60 XPS图谱

表3 Cu-Zn摩尔比对糠醛加氢性能的影响

序号	样品	糠醛转化率 /%	产物收率/%		副产物收率 /%
序号	样品	糠醛转化率 /%	糠醇	2-甲基呋喃	副产物收率 /%
1	CZ-0.22	100.0	70.3	6.5	23.2
2	CZ-0.38	100.0	71.4	6.6	22.0
3	CZ-0.60	100.0	69.0	12.3	18.7
4	CZ-0.90	100.0	72.8	4.4	22.8
5	CZ-1.30	100.0	70.3	8.2	21.5

图7 反应温度对糠醛加氢转化影响（反应条件：糠醛0.6mmol，甲醇12mL，CZ-0.60 30mg，N2 1MPa，600r/min，2h）

图8 糠醛加氢反应产物气相色谱图（反应条件：糠醛0.6mmol，甲醇12mL，CZ-0.60 30mg，240℃，N2 1MPa，600r/min，2h）

图9 催化剂用量对糠醛加氢转化影响（反应条件：糠醛0.6mmol，甲醇12mL，CZ-0.60 30mg，N2 1MPa，600r/min，2h）

图10 反应时间对糠醛加氢转化的影响（反应条件：糠醛0.6mmol，甲醇12mL，CZ-0.60 20mg，N2 1MPa，600r/min，2h）

图11 催化剂循环使用催化性能（反应条件：糠醛0.6mmol，甲醇12mL，催化剂20mg，220℃，N2 1MPa，600r/min，2h）

图12 催化剂CZ-0.60反应前后热重特性

图13 甲醇供氢体系Cu-Zn双金属催化糠醛加氢转化反应路径

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甲醇供氢体系铜锌双金属催化糠醛加氢转化

Cu-Zn catalyzed hydrogenation of furfural with methanol as hydrogen donor

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