Insights into Au Nanoparticle Size and Chemical State of Au/ZSM-5 Catalyst for Catalytic Cracking of n-Octane to Increase Propylene Production
Insights into Au Nanoparticle Size and Chemical State of Au/ZSM-5 Catalyst for Catalytic Cracking of n-Octane to Increase Propylene Production
复制标题
深入了解 Au 纳米颗粒尺寸和 Au/ZSM-5 催化剂的化学状态，用于催化裂解正辛烷以提高丙烯产量
DOI：
10.1021/acs.jpcc.1c04608
复制
发表时间：
2021
影响因子：
3.7
通讯作者：
Qi Caixia
中科院分区：
文献类型：
--
作者：
Zhang Miao;Liu Qi;Long Houang;Sun Libo;Murayama Toru;Qi Caixia
以正辛烷裂解制丙烯为模型反应，考察了金/ZSM-5催化剂的催化活性。采用沉积-沉淀法制备了Au/ZSM-5催化剂，Au颗粒大小均匀，可区分，具有一系列Au颗粒尺寸（6.9-10.6 nm）。通过改变还原温度，制备了不同Au物种的Au/ZSM-5催化剂。与纯ZSM-5相比，这种方法制备的Au/ZSM-5的结晶度、织构参数和酸性没有受到破坏。Au颗粒尺寸和Au物种的影响与催化裂化反应中的催化活性和选择性有关，以增加丙烯产量。发现金属金在裂解反应中占主导地位，而Au颗粒尺寸在脱氢反应中起重要作用。真实的轻柴油的反应结果与辛烷裂解一致，其中较小的金颗粒尺寸提供较好的催化活性。研究了Au的化学状态对催化剂活性和选择性的影响，发现Au 0是催化裂化反应的主要Au活性位。在轻柴油裂解反应中也得到了类似的结论。
The cracking ofn-octane to propylene was chosen as a model reaction over gold catalysts supported on ZSM-5. Au/ZSM-5 catalysts with a series of Au particle sizes (6.9–10.6 nm) were prepared through deposition–precipitation in which the catalysts were distinguishable and had uniform-sized Au particles. Au/ZSM-5 catalysts with different Au species were obtained by changing the reduction temperature. The crystallinity, textural parameters, and acidity of Au/ZSM-5 were not destroyed compared with those of virgin ZSM-5 through this preparation approach. The influences of Au particle size and Au species are linked to the catalytic activity and selectivity in catalytic cracking reactions to increase propylene production. Metallic gold was found to be dominant for the cracking reaction, and the Au particle size played an important role in the dehydrogenation reaction to produce propylene. The reaction results of real light diesel oil are consistent with octane cracking where a smaller gold particle size provides a better catalytic activity. The effects of the Au chemical state on the catalytic activity and selectivity were also researched, and the Au0species was the dominant Au active site for the cracking reaction. A similar conclusion was also verified in the light diesel oil cracking reaction.