CAJ | 학술논문

采用浸渍法制备了Ni/SiC和Ni-Ybx/SiC( x=2%、4%、6%、10%,质量分数)催化剂,在固定床反应装置中考察了催化剂在甲烷二氧化碳重整反应中的性能。利用BET、ICP-AES、XRD、H2-TPR、TG-DTA、XPS和TEM等技术对催化剂进行了表征。实验结果表明,Yb的适宜添加量为4%~6%。在800℃条件下Ni-Yb4/SiC和Ni-Yb6/SiC催化剂具有优异的催化活性和稳定性,在100 h的重整反应中,甲烷和二氧化碳的转化率始终保持在90%以上。 Yb2 O3助剂能够抑制镍颗粒的生长和减少碳沉积量,因此,Ni-Yb/SiC催化剂在连续反应中表现出稳定的活性。
채용침지법제비료Ni/SiC화Ni-Ybx/SiC( x=2%、4%、6%、10%,질량분수)최화제,재고정상반응장치중고찰료최화제재갑완이양화탄중정반응중적성능。이용BET、ICP-AES、XRD、H2-TPR、TG-DTA、XPS화TEM등기술대최화제진행료표정。실험결과표명,Yb적괄의첨가량위4%~6%。재800℃조건하Ni-Yb4/SiC화Ni-Yb6/SiC최화제구유우이적최화활성화은정성,재100 h적중정반응중,갑완화이양화탄적전화솔시종보지재90%이상。 Yb2 O3조제능구억제얼과립적생장화감소탄침적량,인차,Ni-Yb/SiC최화제재련속반응중표현출은정적활성。
Ni/SiC and Ni-Ybx/SiC ( x=2%, 4%, 6%,10%) catalysts were prepared by the impregnation method, and the performances of catalysts in the carbon dioxide reforming of methane were studied in a fixed-bed reactor. The catalysts were characterized by BET, ICP-AES, XRD, H2-TPR, TG-DTA, XPS and TEM techniques. The experimental results indicate that the appropriate addition amount of Yb is 4% to 6%. Ni-Yb4/SiC and Ni-Yb6/SiC catalysts exhibit excellent catalytic activity and stability at 800 ℃, and the conversion of CH4 and CO2 can be maintained over 90% during the 100 h testing. Yb2 O3 promotor can inhibit the growth of nickel nanoparticles and reduce the amount of carbon deposition, therefore Ni-Yb/SiC catalysts show stable activity in the continuous reforming reaction.