Synergistic construction of bifunctional and stable Pt/HZSM-5-based catalysts for efficient catalytic cracking of n-butane
- 7 March 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Nanoscale
- Vol. 13 (9), 5103-5114
- https://doi.org/10.1039/d1nr00302j
Abstract
Efficient conversion of light alkanes is of essential significance for enhancing the utilization efficiency of resources and exploring the activation and evolution regulation of C-C and C-H bonds in stable molecules. The processes are often executed with catalysts under harsh conditions. The olefin yield and metal stability have been the long-standing concerns. Herein, we report a facile strategy of constructing a bifunctional Pt/HZSM-5-based catalyst by two-step atomic layer deposition (ALD) to achieve a high light olefin formation rate of 0.48 mmol g(cat)(-1)center dot min(-1) in the catalytic cracking of n-butane at 600 degrees C, which is similar to 2.2 times higher than that of the conventional Pt/HZSM-5 catalyst (0.22 mmol g(cat)(-1)center dot min(-1)). Moreover, the bifunctional Pt/HZSM-5-based catalyst exhibited outstanding recyclability and excellent metal stability against sintering in comparison with conventional Pt/HZSM-5. Detailed microscopic and spectroscopic characterization studies demonstrate that the metal oxide (TiO2 or Al2O3) coating not only prevents the metal from high-temperature sintering, but also regulates the proportion of coordinately unsaturated platinum surface atoms. Theoretical calculations further confirm the preference of nucleation of TiO2 or Al2O3 on coordinately unsaturated platinum sites, which in turn modulates the bifunctional dehydrogenation-cracking pathway to improve the olefin formation rate.Funding Information
- National Natural Science Foundation of China (91645108, 21878331, 21961132026, 92034302)
- National Key Research and Development Program of China (2020YFA0210900)
- Science Foundation of China University of Petroleum, Beijing (C201604)
This publication has 49 references indexed in Scilit:
- Isomerization of hydrocarbons over Pt supported on micro-mesoporous ZSM-5Polyhedron, 2018
- Integrated tuneable synthesis of liquid fuels via Fischer–Tropsch technologyNature Catalysis, 2018
- Highly Selective Conversion of Carbon Dioxide to Lower OlefinsACS Catalysis, 2017
- Bifunctional Catalysts for One-Step Conversion of Syngas into Aromatics with Excellent Selectivity and StabilityChem, 2017
- Direct conversion of CO2 into liquid fuels with high selectivity over a bifunctional catalystNature Chemistry, 2017
- The controlled synthesis of metal-acid bifunctional catalysts: The effect of metal:acid ratio and metal-acid proximity in Pt silica-alumina catalysts for n-heptane isomerizationJournal of Catalysis, 2016
- Direct and Highly Selective Conversion of Synthesis Gas into Lower Olefins: Design of a Bifunctional Catalyst Combining Methanol Synthesis and Carbon–Carbon CouplingAngewandte Chemie, 2016
- Selective conversion of syngas to light olefinsScience, 2016
- Nanoscale intimacy in bifunctional catalysts for selective conversion of hydrocarbonsNature, 2015
- Direct, Nonoxidative Conversion of Methane to Ethylene, Aromatics, and HydrogenScience, 2014