Effect of redox atmosphere treatment on bifunctional Ga/ZSM-5 for efficient catalytic cracking of n-butane

Ga species with high dehydrogenation capability were prepared by H-2-O-2 atmosphere treatment, and efficient balance of bifunctionality (dehydrogenation/cracking) was realized between Ga species and ZSM-5 over Ga/ZSM-5 based catalysts. Compared with parent Ga/ZSM-5, the conversion rate of n-butane was increased from 0.53 to 2.59 mmol.g(-1).min(-1) on Ga/ZSM-5 with H-2-O-2 treatment. Kinetic analysis revealed that the apparent activation energy of n-butane catalytic cracking decreased largely from 141 to 47 kJ.mol(-1), which is attributed to the formation of new interaction between Ga species and ZSM-5 upon such an atmosphere treatment. It was also found Butane-O-2 treatment acted as a similar role with H-2-O-2 treatment in enhancing the catalytic performance. On this basis, different Ga species were correlated with activity and kinetic data, and the effect of practical reaction atmosphere on Ga spe-cies was also investigated. (c) 2021 Elsevier Ltd. All rights reserved.

Automated summary

By treating with H-2-O-2 atmosphere, Ga species were prepared with high dehydrogenation capability, achieving an efficient balance of bifunctionality with ZSM-5 over Ga/ZSM-5 catalysts. The conversion rate of n-butane was increased, and the apparent activation energy of n-butane catalytic cracking was largely decreased. It was also found that O-2 treatment played a similar role in enhancing the catalytic performance, and the influence of different atmospheres on Ga species was investigated.