Time evolution of the CO2 hydrogenation to fuels over Cu-Zr-SBA-15 catalysts
| Autor: | Lars Ojamäe, Magnus Odén, Aylin Atakan, Peter Mäkie, Edvin Erdtman |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nanoteknik
CO2 hydrogenation 02 engineering and technology 010402 general chemistry 01 natural sciences Cu-Zr-SBA-15 Physical Chemistry Catalysis chemistry.chemical_compound Organic chemistry Dimethyl ether Physical and Theoretical Chemistry Reaction chamber Fysikalisk kemi Time evolution Methanol 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Thermodynamics Nano Technology 0210 nano-technology |
| Popis: | Time evolution of catalytic CO2 hydrogenation to methanol and dimethyl ether (DME) has been investigated in a high-temperature high-pressure reaction chamber where products accumulate over time. The employed catalysts are based on a nano-assembly composed of Cu nanoparticles infiltrated into a Zr doped SiOx mesoporous framework (SBA-15): Cu-Zr-SBA-15. The CO2 conversion was recorded as a function of time by gas chromatography-mass spectrometry (GC-MS) and the molecular activity on the catalyst’s surface was examined by diffuse reflectance in-situ Fourier transform infrared spectroscopy (DRIFTS). The experimental results showed that after 14 days a CO2 conversion of 25% to methanol and DME was reached when a DME selective catalyst was used which was also illustrated by thermodynamic equilibrium calculations. With higher Zr content in the catalyst, greater selectivity for methanol and a total 9.5% conversion to methanol and DME was observed, yielding also CO as an additional product. The time evolution profiles indicated that DME is formed directly from methoxy groups in this reaction system. Both DME and methanol selective systems show the thermodynamically highest possible conversion. Funding agencies: EUs Erasmus-Mundus program (The European School of Materials Doctoral Programme - DocMASE); Knut och Alice Wallenbergs Foundation [KAW 2012.0083]; Swedish Government Strategic Research Area (SFO Mat LiU) [2009 00971]; Swedish Energy Agency [42022-1] |
| Databáze: | OpenAIRE |
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