化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (7) : 204-208.

科学研究

磁性碳纳米管负载铑催化剂在丁腈橡胶氢化方面的应用研究

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Study on MWCNTs@Fe₃O₄@Rh for NBR hydrogenation

Yao Hanbo, Qian Jiangsheng, Xia Ru, Miao Jinbin, Yang Bin, Cao Ming

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Received		Published
2018-02-25		2019-07-20
Issue Date	Revised Date
2019-08-05	2018-02-25

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摘要

采用水热合成法,在多壁碳纳米管(MWCNTs)表面原位生成四氧化三铁(Fe₃O₄)纳米粒子,制备碳纳米管磁性载体(MWCNTs@Fe₃O₄),再将铑(Rh)纳米粒子负载在该磁性载体上,形成新型磁性碳纳米管催化剂(MWCNTs@Fe₃O₄@Rh)。采用透射电子显微镜(TEM),X-射线粉末衍射(XRD),X射线光电子能谱(XPS)等手段表征催化剂的结构和形貌,从TEM可以看出碳纳米管缠绕在直径300nm～400nm的四氧化三铁(Fe₃O₄)纳米粒子上,并且表面负载有直径小于10nm的Rh纳米粒子。采用XRD和XPS等手段也证明Fe₃O₄以及Rh粒子的存在。同时对该催化剂在丁腈橡胶(NBR)选择性加氢方面进行探索。在120℃,4.0MPa,8h条件下,得到了氢化率达到98.17%的氢化丁腈橡胶(HNBR),该催化剂对CC双键具有良好的选择性。将制备的MWCNTs@Fe₃O₄@Rh催化剂与传统的MWCNTs负载Rh的催化剂(MWCNTs@Rh)进行循环使用,发现在重复3次之后,新型催化剂仍能达到91.53%以上的氢化度,而传统的催化剂不到40%。

Abstract

Fe₃O₄ particles were combined with multi-walled carbon nanotubes(MWCNTs) to form MWCNTs@Fe₃O₄ magnetic carrier by in-situ method.Rhodium nanoparticles were loaded onto surface of magnetic carbon nanotubes to form MWCNTs@Fe₃O₄@Rh magnetic carbon nanotube catalysts.The structure and morphology of the catalyst were characterized by TEM,XRD and XPS.It can be seen from TEM that the carbon nanotubes were entangled in Fe₃O₄ nanoparticles with diameter of 300～400nm,and the surface loaded Rh nanoparticles with diameter less than 10nm.The Rh nanoparticles and Fe₃O₄ nanoparticles had a better load on the surface of the carbon nanotube.The existence of Fe₃O₄ and Rh particles can be demonstrated by powder X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS).The hydrogenation of nitrile butadiene rubber (NBR) was used to evaluate the catalytic properties of MWCNTs@Fe₃O₄@Rh.The conversion of 98.17% and good selectivity tor CC were obtained under optimum condition (120℃,4.0MPa,8h).In addition,the traditional catalyst loaded on carbon nanotubes directly(MWCNT@Rh) and prepared MWCNTs@Fe₃O₄@Rh catalyst were both recycled.After repeating 3 times,the hydrogenation degree of catalysts prepared still remain was 91.53%,while the hydrogenation degree of original catalyst was less than 40%.

关键词

丁腈橡胶 / 氢化 / 磁性碳纳米管

Key words

NBR / hydrogenation / magnetic carbon nanotube

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磁性碳纳米管负载铑催化剂在丁腈橡胶氢化方面的应用研究[J]. 化工新型材料, 2019, 47(7): 204-208 DOI:

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