当前位置: X-MOL 学术Catal. Today › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of Manganese and zeolite composition on zeolite-supported Ni-catalysts for dry reforming of methane
Catalysis Today ( IF 5.3 ) Pub Date : 2020-07-31 , DOI: 10.1016/j.cattod.2020.07.058
Aaron J. Najfach , Catherine B. Almquist , Richard E. Edelmann

This study examines the effects of manganese (Mn) on zeolite-supported Ni catalysts for dry reforming of methane (DRM). Three commercially-available zeolites (NH4-ZSM5, NH4-Y, Na-Y) were used as catalyst supports for the Ni (10 wt%) catalysts, and 4 different loadings of Mn (0-15 wt%) were used. The activities of the catalysts were screened, and selected catalysts were investigated for 24 hours in the DRM reaction. It was found that the effects of Mn on catalyst activity depends upon the type of zeolite support. Generally, however, Mn decreased the activity of the zeolite-supported Ni-based catalyst, but reactivity was more stable over a 24 -h reaction period. The beneficial effects of Mn as a promoter on NH4-ZSM5 and NH4-Y zeolites are to reduce carbon deposition, to decrease the crystal size of Ni, and to increase Ni dispersion on the zeolite. However, as Mn loading increases, the crystallinity of the zeolite structure and its micropore surface area generally decrease. Mn loading at 10 wt% and 15 wt% on Na-Y is detrimental to catalyst activity and to crystal structure, as it facilitates the destruction of the crystal structure of the Na-Y zeolite and significantly enhances sintering in a high temperature reducing atmosphere.



中文翻译:

锰和沸石组成对沸石负载的甲烷干法重整镍催化剂的影响

这项研究研究了锰(Mn)对沸石负载的镍催化剂的干式重整甲烷(DRM)的影响。使用三种市售沸石(NH 4 -ZSM5,NH 4 -Y,Na-Y)作为Ni(10 wt%)催化剂的催化剂载体,并使用4种不同的Mn(0-15 wt%)负载量。筛选催化剂的活性,并在DRM反应中研究选择的催化剂24小时。发现Mn对催化剂活性的影响取决于沸石载体的类型。然而,通常,Mn降低了沸石负载的Ni基催化剂的活性,但是在24小时的反应期间反应性更稳定。Mn作为促进剂对NH 4 -ZSM5和NH 4的有益作用-Y沸石将减少碳沉积,减小Ni的晶体尺寸,并增加Ni在沸石上的分散。然而,随着Mn负载量的增加,沸石结构的结晶度及其微孔表面积通常降低。Mn在Na-Y上的负载量为10wt%和15wt%时,这不利于催化剂活性和晶体结构,因为其促进了Na-Y沸石的晶体结构的破坏并显着增强了在高温还原气氛中的烧结。

更新日期:2020-07-31
down
wechat
bug