TY - JOUR
T1 - The preparation of hierarchical Pt/ZSM-5 catalysts and their performance for toluene catalytic combustion
AU - Yang, Dengyao
AU - Fu, Shiyu
AU - Huang, Shushu
AU - Deng, Wei
AU - Wang, Yu
AU - Guo, Limin
AU - Ishihara, Tatsumi
N1 - Funding Information:
The work was financially supported by National Key R&D program of China ( 2017YFE0127400 ), Natural Science Foundation of Hubei Province ( 2019CFA070 ), the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure ( SKL201707SIC ), the Opening Project of Hubei Key Laboratory of Processing and Application of Catalytic Materials ( 201829103 ) and Program for Huazhong University of Science and Technology (HUST) Academic Frontier Youth Team ( 2018QYTD03 ). The authors thank the Analysis and Testing Center of HUST for analytical support. Appendix A
Funding Information:
The SEM observation was used to check the overall microstructure of the Pt/mZSM-5 catalysts and the images were in Fig. 3. Compared with the ZSM-5 (Fig. S3), the Pt/mZSM-5 showed the irregular morphology and porous structure resulting from the aggregated nanostructure (Fig. 3). The supported Pt cannot be observed due to the low loading amount and ultra-small particle size of Pt. The TEM observation was used to confirm the size of the supported Pt and the TEM images and Pt particle size statistical results (insets) were shown in Fig. 4. According to the overview of the TEM images of as-prepared Pt catalysts, the Pt particles highly dispersed on the hierarchical ZSM-5 samples (Fig. 4A, B and 4C) compared with those on the conventional ZSM-5 (Fig. 4D), KIT-6 (Fig. 4E) and mAl2O3 (Fig. 4F). On the basis of Pt particle size statistical results of TEM observation, the Pt particle size for Pt/mZSM-5-A8, Pt/mZSM-5-A10, Pt/mZSM-5-A12, Pt/ZSM-5, Pt/KIT-6 and Pt/mAl2O3 centered 2, 3, 4, 6, 9 and 5?nm, respectively. Generally, the dispersity of active component directly influenced the performance of the catalysts [9,31] and mesopores in zeolite can improve the dispersity of noble metals [26,28]. For further understanding the relationship between the microstructure of supports and Pt dispersity, H2-TPD of as-prepared catalysts was measured [32] and the results were shown in Fig. S4. The H2 desorption peak, which was attributed to chemisorbed hydrogen desorbing from the platinum particles [33], centered around 100??C can be observed in all samples except Pt/KIT-6. The H2 adsorption capacity and calculated metallic Pt surface areas for as-prepared catalysts were calculated and summarized in Table 2. Especially, the desorbed H2 amount for Pt/mZSM-5-A8 catalyst was 0.56??mol/g and metallic Pt surface area was 81.3?m2/g, which demonstrated the highest Pt dispersion for Pt/mZSM-5-A8 in all as-prepared catalysts.The work was financially supported by National Key R&D program of China (2017YFE0127400), Natural Science Foundation of Hubei Province (2019CFA070), the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure (SKL201707SIC), the Opening Project of Hubei Key Laboratory of Processing and Application of Catalytic Materials (201829103) and Program for Huazhong University of Science and Technology (HUST) Academic Frontier Youth Team (2018QYTD03). The authors thank the Analysis and Testing Center of HUST for analytical support.
PY - 2020/4
Y1 - 2020/4
N2 - The hierarchical ZSM-5 zeolite with tunable mesopore volume was successfully prepared by adjusting the synthesis condition and used as the support for dispersing Pt. The mesopore volume of as-prepared hierarchical ZSM-5 zeolite showed the monotonous and positive effect for the Pt dispersion. The toluene catalytic combustion was used to evaluate the performance of as-prepared Pt supported catalysts. The results demonstrated the high performance for catalytic toluene combustion over hierarchical Pt/mZSM-5 catalysts compared with Pt/ZSM-5. In addition, the hierarchical Pt/mZSM-5 catalysts showed better reactant molecular diffusion according to the results of toluene dynamic adsorption experiments. Among all the as-prepared catalysts, Pt/mZSM-5-A8 exhibited best activity that T90 was 159 °C and Ea was 40.0 kJ/mol at 500 ppm toluene and 80,000 mL/(g · h), and the catalyst showed high stability and catalytic activity after catalytic testing for 20 h at 155 °C, which implied a promising catalyst for practical application.
AB - The hierarchical ZSM-5 zeolite with tunable mesopore volume was successfully prepared by adjusting the synthesis condition and used as the support for dispersing Pt. The mesopore volume of as-prepared hierarchical ZSM-5 zeolite showed the monotonous and positive effect for the Pt dispersion. The toluene catalytic combustion was used to evaluate the performance of as-prepared Pt supported catalysts. The results demonstrated the high performance for catalytic toluene combustion over hierarchical Pt/mZSM-5 catalysts compared with Pt/ZSM-5. In addition, the hierarchical Pt/mZSM-5 catalysts showed better reactant molecular diffusion according to the results of toluene dynamic adsorption experiments. Among all the as-prepared catalysts, Pt/mZSM-5-A8 exhibited best activity that T90 was 159 °C and Ea was 40.0 kJ/mol at 500 ppm toluene and 80,000 mL/(g · h), and the catalyst showed high stability and catalytic activity after catalytic testing for 20 h at 155 °C, which implied a promising catalyst for practical application.
UR - http://www.scopus.com/inward/record.url?scp=85077327253&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85077327253&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2019.109802
DO - 10.1016/j.micromeso.2019.109802
M3 - Article
AN - SCOPUS:85077327253
VL - 296
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
M1 - 109802
ER -