Unravelling the Metal-Support Interactions in χ-Fe5C2/MgO Catalysts for Olefins Synthesis Directly from Syngas

2022 ◽  
Author(s):  
Yitao Liu ◽  
Xianglin Liu ◽  
Zixu Yang ◽  
Hu Li ◽  
Xiaoxu Ding ◽  
...  
Keyword(s):  
Electronic Structures ◽  
High Selectivity ◽  
Metal Support ◽  
Catalytic Stability ◽  
Metal Support Interactions ◽  
Adsorption Desorption

We reported the χ-Fe5C2/MgO catalyst for olefins synthesis directly from syngas (STO), showing high selectivity to C2-C4 olefins and catalytic stability. With characterization of morphology, electronic structures, and adsorption/desorption properties...

scholarly journals Synthesis and characterization of Mo2 C based materials over activated carbon derived from sewage sludge pyrolysis for catalytic applications

Cerâmica ◽  
2018 ◽  
Vol 64 (370) ◽  
pp. 148-155
Author(s):  
A. C. Alexandrino ◽  
J. F. de Sousa ◽  
C. P. de Souza ◽  
C. P. B. de Araújo ◽  
M. V. M. Souto
Keyword(s):  
Sewage Sludge ◽  
Surface Area ◽  
Synthesis Method ◽  
Metal Catalyst ◽  
Catalytic Material ◽  
Metal Support ◽  
Size Evaluation ◽  
Adsorption Desorption ◽  
Substitute Materials

Abstract Transition metal carbides have been successfully used as substitute materials for conventional noble metal catalyst in several important industrial reactions due to their interesting physicochemical properties. Surface structure, chemical composition and metal-support interactions, as well as processing conditions, are of utmost importance in the use of such materials in catalysis. The present study aimed to synthesize and evaluate pure molybdenum carbide with and without support, and bimetallic Mo-Ni carbide over a carbon active support derived from sewage sludge pyrolysis. The support was chemically (KOH) and physically (thermal treatment) activated before use. TG/DTG, XRD, XRF, SEM, BET and particle size evaluation were performed, together with adsorption/desorption isotherms. Results indicated that the applied synthesis method was adequate for the obtainment of pure materials. The increase in surface area of the support was significant, from 13 to 141 m².g-1 after the thermal and chemical treatment; also, supporting Mo2C over carbon provided an increase from 45 to 73 m².g-1 in surface area, which indicated its potential as a catalytic material as well as the effectiveness of the applied methodology.

scholarly journals Extraction and Mass Spectrometric Characterization of Terpenes Recovered from Olive Leaves Using a New Adsorbent-Assisted Supercritical CO2 Process

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1301
Author(s):  
Zully J. Suárez Montenegro ◽  
Gerardo Álvarez-Rivera ◽  
Jose A. Mendiola ◽  
Elena Ibáñez ◽  
Alejandro Cifuentes
Keyword(s):  
Aluminum Oxide ◽  
Silica Gel ◽  
Supercritical Co2 ◽  
Olive Leaves ◽  
Fractionation Process ◽  
Selective Enrichment ◽  
Adsorption Desorption ◽  
First Time ◽  
By Products

This work reports the use of GC-QTOF-MS to obtain a deep characterization of terpenoid compounds recovered from olive leaves, which is one of the largest by-products generated by the olive oil industry. This work includes an innovative supercritical CO2 fractionation process based on the online coupling of supercritical fluid extraction (SFE) and dynamic adsorption/desorption for the selective enrichment of terpenoids in the different olive leaves extracts. The selectivity of different commercial adsorbents such as silica gel, zeolite, and aluminum oxide was evaluated toward the different terpene families present in olive leaves. Operating at 30 MPa and 60 °C, an adsorbent-assisted fractionation was carried out every 20 min for a total time of 120 min. For the first time, GC-QTOF-MS allowed the identification of 40 terpenoids in olive leaves. The GC-QTOF-MS results indicate that silica gel is a suitable adsorbent to partially retain polyunsaturated C10 and C15 terpenes. In addition, aluminum oxide increases C20 recoveries, whereas crystalline zeolites favor C30 terpenes recoveries. The different healthy properties that have been described for terpenoids makes the current SFE-GC-QTOF-MS process especially interesting and suitable for their revalorization.

Growth kinetic control over MgFe2O4 to tune Fe occupancy and metal–support interactions for optimum catalytic performance

CrystEngComm ◽  
2021 ◽  
Vol 23 (13) ◽  
pp. 2538-2546
Author(s):  
Min Yang ◽  
Guangshe Li ◽  
Huixia Li ◽  
Junfang Ding ◽  
Yan Wang ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Growth Kinetic ◽  
Catalytic Performance ◽  
Growth Behavior ◽  
Kinetic Control ◽  
Size Dependent ◽  
Metal Support ◽  
Support Size ◽  
Metal Support Interactions ◽  
First Time

For the first time, the growth behavior with size-dependent Fe occupancies at different sites of MgFe2O4 was examined. Hybrid catalysts of Pt/MgFe2O4 with a support size of 20.6 nm exhibited an optimal performance of CO oxidation.

Metal–Support Interactions in Fe/ZrO2Catalysts for Hydrogenation of CO

1997 ◽  
Vol 167 (2) ◽  
pp. 573-575 ◽  
Author(s):  
Kaidong Chen ◽  
Yining Fan ◽  
Qijie Yan
Keyword(s):  
Metal Support ◽  
Metal Support Interactions ◽  
Hydrogenation Of Co
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