Fe2O3含量对Cu-Fe铝土矿水煤气变换催化剂结构和性能的影响.pdf

第29卷第11期
无机化学学报
Vol 29 No.1 1
2013年11月
CHINESE JOURNAL OF INORGANIC CHEMISTRY
2297-2304
Fe_O3含量对Cu-Fe铝土矿水煤气变换催化剂结构和性能的影响
江莉龙*刘弦曹彦宁曾杰凯林施圆魏可镁
(福州大学化肥化剂国家工程研究中心,福州35000)
摘要:利用具有高比表面积和介孔结构的改性铝土矿为载体,采用并流共沉淀法制备不同Fe_02含量的Cu-Fe/铝土矿催化剂。
以水煤气变换反应为探针反应,考察了催化剂性能。利用X射线荧光元素分析(XR)、X射线粉末行射XRD)、H2程序升温还原
(H2TPR)、CO程序升温脱附(CO-TPD)和X射线光电子能谱(XPS)等对催化剂进行了表征。结果表明:负载的FeAO2能显著提高
CuO/改性铝土矿催化剂的水煤气变换活性特别是热稳定性能,且随负载的Fe2O3含量增加而提高,当负载量为20%时达到最
佳。其原因是负载的Fe203和CuO之间发生了相互作用,形成了类似于 Curexo4复合氧化物,且随负载的Fe-O3含量的增加而增
强,这种相互作用同时促进了Cu0和Fe2O的还原,抑制了CuO的烧结,进而提高了催化剂的性能。
关键词:氧化铁含量;铝土矿;铜一铁/铝土矿催化剂;水煤气变换
中图分类号:0643文献标识码:A文章编号:1001-4861(2013)112297-08
DOI:10.39695is9.1001-4861.2013.00.338
Effect of Fe 0; Content on Structure and Catalytic Performance of Cu-fe/Bauxite for
Water Gas Shift Reaction
JIANG Li-long LIU Xian CAO Yan-ning ZENG Jie-kai LIN Shi-tuan WEI Ke-mei
(Nationad Engineering Research Center for Chemical Fertilizer Catalyst at Fushou University, Fiushou 350002, China)
Abstract: Using modified bauxite with large surface area and mesoporous structure as the supporl, a series of Cu
Fe/Bauxite catalysts were synthesized with co-precipitation method. The catalysts were characterized by means of
X-ray fluorescence spectrometry(XR, X-ray difraction(XRD), Sa H temperature-programmed reduction(H
TPR)and CO temperature-programmed desorption(co-tpd )and X-ray photoelectron spectroscopy (XPS). The
eir
catalytic activity in water gas shift (WGS)reaction has also been studied. The results indicate that the WGS
reaction activity increases markedly with increasing the content of supported Fe20, and when the content of Fe203
is to 20%, the catalyst exhibits the highest activity. Because there exists obvious interaction between supporte
Fe, 0 and CO to form composite oxide like Cule,O and it enhances with increase in Fex0; content. The
interaction promotes the reduction of Fe2; and Cuo and restrains the clotting of Cuo, and then the catalytic
activity increases
Key words: iron oxide content:; bauxite; copper-iron/bauxite catalyst:; water gas shift
0引
△Hx=-41.2kJ?mol1,AG2=-28.6kJ?mol-)是利用
C0的还原性从水获取氢气的经典途径,但反应过
水煤气变换(WCS)反应(CO+H1O=C(O2+H2,程涉及的高效催化剂是关键。在众多的水煤气变换
收稿日期:2013-03-09。收修改稿日期:2013-06-06
福建省科技厅产学重大项目(No.2012H6010);福建省自然科学基金CNo.201101036);福州大学育苜基企(No.2012-XY5)资助项目。
*通讯联系人。E-mail:sjli@fzu.edu.cn,Phone:(0591)83731234-8201