Shanxi University Wang Changzhen/Zhao Yongxiang team ACS AMI: Nickel-based nanocapsule reactor in the gas phase catalytic reaction...

Currently, Yolk- shell nanostructure materials can be widely used in the fields of catalysis, sensors, energy storage and conversion due to their unique "
nanoreactor " characteristics .

In order to improve the structural stability of the nanoreactor , it is usually necessary to increase the thickness of the shell layer of the

In view of this , Shanxi University, Wang really long / Zhao Yongxiang research group jointly Oxford Tiancun Xiao researcher in " ACS Applied Materials and Interfaces on" journal published a report entitled "Yolk-shell Nanocapsule Catalysts AS Nanoreactor with Various Shell Structures and Their Diffusion Effect ON CO ₂ Reforming of Methane" article
.

The article proposes a new way catalyst having a nano-capsule structure extending space to C H _.
4
-CO ₂ dry reforming reaction as an inspection object, by nano-reactor ( NSNC-the Tx ) different shell structure (shell the thickness and porosity) of the regulation and the deep structure-activity relationship study system , on the shell and diffusion effects Yolk-shell inherent link between the catalytic performance of nano-reactor to establish a new understanding

Highlights of this article

Key point 1.

In- depth analysis of the structural characteristics of the nanocapsule catalyst.
The shell structure that affects the diffusion of the substrate in the nanoreactor includes the thickness of the shell and the porosity of the shell.

Figure 1.

Structure analysis of nanocapsule catalyst

Point 2 : After eliminating the internal and external diffusion between traditional particles (pell et s), dry methane weight is carried out by NSNC-Tx (x = 5, 10, 15, 20 ) catalysts of the same metal site at different temperatures and different space velocities.

The results of the whole catalytic reaction test show that when the reaction temperature is lower , the reaction space velocity is higher, the difference in catalytic activity of nanoreactors with different shell structures is more obvious, which confirms the inherent influence of the shell diffusion effect on the catalytic performance of the material : For the core/yolk-shell nanoreactor , the reactant gas molecules must enter the nanoreactor through the shell to contact and react with the metal sites, while the product gas molecules leave the nanoreactor through the shell , so the diffusion effect of the nanoreactor Its essential activity has a significant impact

FIG.

2.

Points 3 , utilizing different forms of the model proposed Yolk-shell structure nano-reactor diffusion effect works
.

Among them, the " gas wall " effect leads to the temporary deactivation of the nanoreactor, and the " har d blocker " effect leads to the permanent deactivation of the nanoreactor.

FIG.

3.

Point 4.

Use probe molecules (H ₂ , CH ₄ , CO ) that

Figure 4.
a) H ₂ -TPR, b) CH ₄ -TPD, c) and d) N SNC-T10 and N SNC-T20 in - situ infrared transmission

Changzhen Wang*, Hao Wu, Xiangyu Jie, Xiaoming Zhang, Yongxiang Zhao, Benzhen Yao, and Tiancun Xiao* , Yolk ? Shell Nanocapsule Catalysts as Nanoreactors with Various Shell Structures and Their Diffusion Effect on the CO ₂ Reforming of Methane.
ACS Appl.
Mater.
Interfaces

Related Links

https://doi.
org/10.
1021/acsami.
1c06847