Ni-Sm_x/SiC催化剂甲烷二氧化碳重整性能研究

Performance of Ni-Sm_x /SiC catalysts for CO_2 reforming of CH_4

用浸渍法制备了不同钐含量的Ni-Sm_x/SiC催化剂,其中,镍的质量分数为9%,氧化钐的质量分数分别为0、2%、3%、4%、5%、7%。采用常压微型固定床反应器考察了不同催化剂在甲烷二氧化碳重整反应中的催化性能,并用BET、ICP、XRD、H2-TPR、TG-DTA、XPS和TEM等技术对反应前后催化剂进行表征。结果表明,加入钐后,重整反应中甲烷和二氧化碳转化率明显提高。当钐含量为5%时,Ni-Sm5/SiC表现出最好的活性和稳定性,而且反应后催化剂表面积炭量最少。其原因是钐的加入提高了活性组分与载体的相互作用,有效减少了表面积炭、提高了催化剂的稳定性。

Ni-Smx/SiC （x=0, 2%, 3%, 4%, 5%, 7%） catalysts were prepared by impregnation method, and the performance of catalysts for carbon dioxide reforming of methane were tested in a fixed bed reactor. The catalysts were characterized by BET, ICP, XRD, H2-TPR, TG-DTA, XPS and TEM. The results showed that Ni-Sm5/SiC had excellent catalytic activity and stability, and the least amount of coke deposition. The addition of samarium effectively enhanced the interaction of metal active component and support, and reduced the formation of coke and therefore improved the catalyst stability.