Portillo A, Ateka A, Ereña J, Aguayo AT, Bilbao J. Conditions for the Joint Conversion of CO
2 and Syngas in the Direct Synthesis of Light Olefins Using In
2O
3–ZrO
2/SAPO-34 Catalyst.
Ind Eng Chem Res 2021;
61:10365-10376. [PMID:
35915619 PMCID:
PMC9335533 DOI:
10.1021/acs.iecr.1c03556]
[Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
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The conditions for
promoting the joint conversion of CO2 and syngas in the
direct synthesis of light olefins have been studied.
In addition, given the relevance for the viability of the process,
the stability of the In2O3–ZrO2/SAPO-34 (InZr/S34) catalyst has also been pursued. The CO+CO2 (COx) hydrogenation experimental
runs were conducted in a packed bed isothermal reactor under the following
conditions: 375–425 °C; 20–40 bar; space time,
1.25–20 gcatalyst h molC–1; H2/(COx) ratio in the feed,
1–3; CO2/(COx) ratio
in the feed, 0.5; time on stream (TOS), up to 24 h. Analyzing the
reaction indices (CO2 and COx conversions, yield and selectivity of olefins and paraffins, and
stability), the following have been established as suitable conditions:
400 °C, 30 bar, 5–10 gcat h molC–1, CO2/COx = 0.5, and H2/COx = 3. Under
these conditions, the catalyst is stable (after an initial period
of deactivation by coke), and olefin yield and selectivity surpass
4 and 70%, respectively, with light paraffins as byproducts. Produced
olefin yields follow propylene > ethylene > butenes. The conditions
of the process (low pressure and low H2/COx ratio) may facilitate the integration of sustainable
H2 production with PEM electrolyzers and the covalorization
of CO2 and syngas obtained from biomass.
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