As one of the most significant chemicals in the industry, 1,3-butadiene has been widely used in various fields. Recently, butane dehydrogenation (BDH) has emerged as a new frontier for the production of 1,3-butadiene. However, this process is limited by the low selectivity to the desired product since BDH experiences a complicated dehydrogenation process and the products consist of various C1–C4 hydrocarbons. Here, we demonstrate that an In2O3-modified Pt-based catalyst can serve as an effective catalyst for the dehydrogenation of n-butane to 1,3-butadiene. The optimum catalyst exhibits n-butane conversion and 1,3-butadiene selectivity of 45.2 and 21.9%, respectively, at 575 °C. Further experimental results indicate that In2O3 can improve the dispersion of Pt, regulate acidity, and suppress n-butane dehydroisomerization (BDI).
Zhan-Yuan Huang,Lang-Xi Ou,Zhi-Wei Zheng,Yi-Wei Wang,Xiao-Fei Zhang,Shi-Ying He,Hong-Xiu Yu,Hong-Liang Lu
The In2O3-modified ZnO@SnO2 core–shell nanosheets (NSs) were synthesized via an innovative and facile route that combines the modified hydrothermal method with an atomic layer deposition (ALD) process. The self-limiting reactions inherent to ALD facilitate precise control over the film thickness, enabling the design of well-defined core–shell nanostructures for gas-sensing applications. Evaluation of gas-sensing properties revealed that the construction of the ZnO@SnO2 core–shell heterostructure combined with In2O3 surface modification markedly improved the sensing performance. The optimized ZnO@SnO2/In2O3 sensor with a 20 nm SnO2 shell (denoted as Z@S/I-20) exhibited a high response (Ra/Rg = 148.6) toward 100 ppm ethanol at 350 °C, which was approximately 3.6 and 1.6 times higher than that of ZnO/In2O3 NSs (40.3) and unmodified ZnO@SnO2 core–shell NSs with 20 nm SnO2 (91.6), respectively. Furthermore, the Z@S/I-20 gas sensor demonstrated a response/recovery time of 140.2:36.6 s, remarkable selectivity toward ethanol, and an ultralow detection limit of 64 ppb. The significantly enhanced sensing performance is attributed to the synergistic effect of heterojunction formation, the porous mesh morphology of In2O3 nanowires, and the optimized SnO2 shell thickness, as systematically discussed in this work. These findings highlight the potential of the proposed synthesis route and sensor design for the development of high-performance microelectromechanical system (MEMS)-based gas sensors that can be applied to ethanol detection.
危险品化学品经营许可证（带存储）