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ZrO2–ZnO–CeO2 integrated with nano-sized SAPO-34 zeolite for CO2 hydrogenation to light olefins
Granule oxides of ZrO 2 –ZnO–CeO 2 are integrated with nano - sized SAPO-34 zeolites to form tandem catalyst, which is effectively utilized in catalysis of CO 2 hydrogenation to produce light olefins. Then, Nano-sized SAPO-34 zeolite of particle diameter about 100 nm is synthesized by using morpholi...
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Published in: | Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2022-12, Vol.135 (6), p.2959-2972 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Granule oxides of ZrO
2
–ZnO–CeO
2
are integrated with nano
-
sized SAPO-34 zeolites to form tandem catalyst, which is effectively utilized in catalysis of CO
2
hydrogenation to produce light olefins. Then, Nano-sized SAPO-34 zeolite of particle diameter about 100 nm is synthesized by using morpholine-treated SAPO-34 as seed of crystal and taking morpholine as the sole template. Ternary ZrO
2
–ZnO–CeO
2
oxides with various CeO
2
contents are prepared by traditional co-precipitation method. The catalysts were characterized by XRD, SEM, TEM, N
2
adsorption–desorption, H
2
-TPR, NH
3
-TPD, CO
2
-TPD, XPS and in situ DRIFT measurements. The introduction of CeO
2
into Zr-Zn oxides efficiently increases the oxygen vacancies to possess the stronger adsorption capacity of CO
2
and H
2
. Nano-sized SAPO-34 has a larger specific surface area and suitable amount of medium to strong acidic sites. CO
2
conversion and products distribution are strongly dependent on the oxide composition and morphology of SAPO-34 zeolite. When the atomic ratio of Zr:Zn:Ce is 4:2:1, the mass ratio of metal oxide to zeolite is 1:1, under the reaction temperature of 350 °C, pressure of 2.6 MPa, CO
2
:H
2
= 1:3 (molar ratio), GHSV = 6000 mL/(g
cat
h) and the tandem catalyst dosage of 0.5 g, the CO
2
conversion is 24.1%, the selectivity and yield of light olefins are 86.3% and 20.8%, respectively, and the catalytic lifetime is about 425 min. |
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ISSN: | 1878-5190 1878-5204 |
DOI: | 10.1007/s11144-022-02319-2 |