1
|
Wang Y, Yang X, Xiao L, Qi Y, Yang J, Zhu YA, Holmen A, Xiao W, Chen D. Descriptor-Based Microkinetic Modeling and Catalyst Screening for CO Hydrogenation. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04347] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Yalan Wang
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Xiaoli Yang
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
- State Key Laboratory of Bio-Fibers and Eco-textiles, Qingdao University, Qingdao 266071, P. R. China
| | - Ling Xiao
- UNILAB, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yanying Qi
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Jia Yang
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Yi-An Zhu
- UNILAB, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Anders Holmen
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Wende Xiao
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dong-Chuan Road, Shanghai 200240, China
| | - De Chen
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| |
Collapse
|
2
|
The Effect of CO Partial Pressure on Important Kinetic Parameters of Methanation Reaction on Co-Based FTS Catalyst Studied by SSITKA-MS and Operando DRIFTS-MS Techniques. Catalysts 2020. [DOI: 10.3390/catal10050583] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
A 20 wt% Co-0.05 wt% Pt/γ-Al2O3 catalyst was investigated to obtain a fundamental understanding of the effect of CO partial pressure (constant H2 partial pressure) on important kinetic parameters of the methanation reaction (x vol% CO/25 vol% H2, x = 3, 5 and 7) by performing advanced transient isotopic and operando diffuse reflectance infrared Fourier transform spectroscopy–mass spectrometry (DRIFTS-MS) experiments. Steady State Isotopic Transient Kinetic Analysis (SSITKA) experiments conducted at 1.2 bar, 230 °C after 5 h in CO/H2 revealed that the surface coverages, θCO and θCHx and the mean residence times, τCO, and τCHx (s) of the reversibly adsorbed CO-s and active CHx-s (Cα) intermediates leading to CH4, respectively, increased with increasing CO partial pressure. On the contrary, the apparent activity (keff, s−1) of CHx-s intermediates, turnover frequency (TOF, s−1) of methanation reaction, and the CH4-selectivity (SCH4, %) were found to decrease. Transient isothermal hydrogenation (TIH) following the SSITKA step-gas switch provided important information regarding the reactivity and concentration of active (Cα) and inactive -CxHy (Cβ) carbonaceous species formed after 5 h in the CO/H2 reaction. The latter Cβ species were readily hydrogenated at 230 °C in 50%H2/Ar. The surface coverage of Cβ was found to vary only slightly with increasing CO partial pressure. Temperature-programmed hydrogenation (TPH) following SSITKA and TIH revealed that other types of inactive carbonaceous species (Cγ) were formed during Fischer-Tropsch Synthesis (FTS) and hydrogenated at elevated temperatures (250–550 °C). The amount of Cγ was found to significantly increase with increasing CO partial pressure. All carbonaceous species hydrogenated during TIH and TPH revealed large differences in their kinetics of hydrogenation with respect to the CO partial pressure in the CO/H2 reaction mixture. Operando DRIFTS-MS transient isothermal hydrogenation of adsorbed CO-s formed after 2 h in 5 vol% CO/25 vol% H2/Ar at 200 °C coupled with kinetic modeling (H-assisted CO hydrogenation) provided information regarding the relative reactivity (keff) for CH4 formation of the two kinds of linear-type adsorbed CO-s on the cobalt surface.
Collapse
|
3
|
Qi Y, Aaserud C, Holmen A, Yang J, Chen D. Promotional effect of in situ generated hydroxyl on olefin selectivity of Co-catalyzed Fischer-Tropsch synthesis. Phys Chem Chem Phys 2019; 21:24441-24448. [PMID: 31674631 DOI: 10.1039/c9cp04677a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The understanding of the water effect on olefin selectivity in Fischer-Tropsch synthesis (FTS) is limited by the complexity of the reaction network. Herein, we employ propene hydrogenation as a model reaction to isolate the water effect on olefin adsorption and hydrogenation from the complex reaction of FTS. It is clearly observed that the added water inhibits the activity of propene hydrogenation on two cobalt catalysts supported on high-surface-area alumina (HAS Al2O3) and low-surface-area alumina (LSA Al2O3), respectively. The inhibiting effect is much stronger for Co/HSA Al2O3. DFT investigation demonstrates that the in situ generated OH, rather than H2O and O, impedes the adsorption of propene and thus decreases the activity of propene hydrogenation. The suppressive effect of OH on propene adsorption is attributed to the downshift of the d-band center and the Bader charge of the catalyst surface. The DFT-based kinetic analysis finds that the higher site coverage of OH results in the more pronounced negative effect on propene hydrogenation. Furthermore, the theory of OH-induced weak olefin adsorption and low olefin hydrogenation activity could rationalize the enhancement effect of water on the olefin selectivity and the particle size dependence of the water effect in FTS. The insights obtained here may inspire researchers to optimize olefin selectivity by manipulating the electronic properties of catalysts with hydroxyl species.
Collapse
Affiliation(s)
- Yanying Qi
- Department of Chemical Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
| | | | | | | | | |
Collapse
|
4
|
Vasiliades M, Kalamaras C, Govender N, Govender A, Efstathiou A. The effect of preparation route of commercial Co/γ-Al2O3 catalyst on important Fischer-Tropsch kinetic parameters studied by SSITKA and CO-DRIFTS transient hydrogenation techniques. J Catal 2019. [DOI: 10.1016/j.jcat.2019.09.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
5
|
Liu B, Li W, Xu Y, Lin Q, Jiang F, Liu X. Insight into the Intrinsic Active Site for Selective Production of Light Olefins in Cobalt-Catalyzed Fischer–Tropsch Synthesis. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00352] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Bing Liu
- Department of Chemical Engineering, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, People’s Republic of China
| | - Wenping Li
- Department of Chemical Engineering, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, People’s Republic of China
| | - Yuebing Xu
- Department of Chemical Engineering, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, People’s Republic of China
| | - Qiang Lin
- Department of Chemical Engineering, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, People’s Republic of China
| | - Feng Jiang
- Department of Chemical Engineering, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, People’s Republic of China
| | - Xiaohao Liu
- Department of Chemical Engineering, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, People’s Republic of China
| |
Collapse
|
6
|
Investigation of C1 + C1 Coupling Reactions in Cobalt-Catalyzed Fischer-Tropsch Synthesis by a Combined DFT and Kinetic Isotope Study. Catalysts 2019. [DOI: 10.3390/catal9060551] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Understanding the chain growth mechanism is of vital importance for the development of catalysts with enhanced selectivity towards long-chain products in cobalt-catalyzed Fischer-Tropsch synthesis. Herein, we discriminate various C1 + C1 coupling reactions by theoretical calculations and kinetic isotope experiments. CHx(x=0−3), CO, HCO, COH, and HCOH are considered as the chain growth monomer respectively, and 24 possible coupling reactions are first investigated by theoretical calculations. Eight possible C1 + C1 coupling reactions are suggested to be energetically favorable because of the relative low reaction barriers. Moreover, five pathways are excluded where the C1 monomers show low thermodynamic stability. Effective chain propagation rates are calculated by deconvoluting from reaction rates of products, and an inverse kinetic isotope effect of the C1 + C1 coupling reaction is observed. The theoretical kinetic isotope effect of CO + CH2 is inverse, which is consistent with the experimental observation. Thus, the CO + CH2 pathway, owing to the relatively lower barrier, the high thermodynamic stability, and the inverse kinetic isotope effect, is suggested to be a favorable pathway.
Collapse
|
7
|
Athariboroujeny M, Raub A, Iablokov V, Chenakin S, Kovarik L, Kruse N. Competing Mechanisms in CO Hydrogenation over Co-MnOx Catalysts. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00967] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Motahare Athariboroujeny
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Wegner Hall 155, PO Box 646515, Pullman, Washington 99164-6515, United States
| | - Andrew Raub
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Wegner Hall 155, PO Box 646515, Pullman, Washington 99164-6515, United States
| | - Viacheslav Iablokov
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Wegner Hall 155, PO Box 646515, Pullman, Washington 99164-6515, United States
| | - Sergey Chenakin
- G.V. Kurdyumov Institute for Metal Physics NASU, Akad. Vernadsky Blvd. 36, 03142 Kyiv, Ukraine
| | - Libor Kovarik
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99332, United States
| | - Norbert Kruse
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Wegner Hall 155, PO Box 646515, Pullman, Washington 99164-6515, United States
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99332, United States
| |
Collapse
|
8
|
Liu L, Yu M, Wang Q, Hou B, Liu Y, Wu Y, Yang Y, Li D. Insight into the structure and morphology of Run clusters on Co(111) and Co(311) surfaces. Catal Sci Technol 2018. [DOI: 10.1039/c8cy00463c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The adsorption configurations, growth modes and morphology of a Ru promoter under the approximate conditions of cobalt catalyzed Fischer–Tropsch synthesis (FTS) were investigated by density functional theory (DFT) calculations.
Collapse
Affiliation(s)
- Lili Liu
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry, Chinese Academy of Sciences
- Taiyuan
- People's Republic of China
- University of Chinese Academy of Sciences
| | - Mengting Yu
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry, Chinese Academy of Sciences
- Taiyuan
- People's Republic of China
- University of Chinese Academy of Sciences
| | - Qiang Wang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry, Chinese Academy of Sciences
- Taiyuan
- People's Republic of China
| | - Bo Hou
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry, Chinese Academy of Sciences
- Taiyuan
- People's Republic of China
| | - Yan Liu
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry, Chinese Academy of Sciences
- Taiyuan
- People's Republic of China
| | - Yanbo Wu
- The Key Lab of Materials for Energy Conversion and Storage of Shanxi Province
- Institute of Molecular Science, Shanxi University
- Taiyuan
- People's Republic of China
| | - Yongpeng Yang
- Research Center of Heterogeneous Catalysis and Engineering Sciences
- School of Chemical Engineering and Energy
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Debao Li
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry, Chinese Academy of Sciences
- Taiyuan
- People's Republic of China
| |
Collapse
|
9
|
Chen W, Pestman R, Zijlstra B, Filot IAW, Hensen EJM. Mechanism of Cobalt-Catalyzed CO Hydrogenation: 1. Methanation. ACS Catal 2017; 7:8050-8060. [PMID: 29226009 PMCID: PMC5716442 DOI: 10.1021/acscatal.7b02757] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 09/24/2017] [Indexed: 11/28/2022]
Abstract
![]()
The
mechanism of CO hydrogenation to CH4 at 260 °C
on a cobalt catalyst is investigated using steady-state isotopic transient
kinetic analysis (SSITKA) and backward and forward chemical transient
kinetic analysis (CTKA). The dependence of CHx residence time is determined by 12CO/H2 → 13CO/H2 SSITKA as a function of the
CO and H2 partial pressure and shows that the CH4 formation rate is mainly controlled by CHx hydrogenation rather than CO dissociation. Backward CO/H2 → H2 CTKA emphasizes the importance of
H coverage on the slow CHx hydrogenation
step. The H coverage strongly depends on the CO coverage, which is
directly related to CO partial pressure. Combining SSITKA and backward
CTKA allows determining that the amount of additional CH4 obtained during CTKA is nearly equal to the amount of CO adsorbed
to the cobalt surface. Thus, under the given conditions overall barrier
for CO hydrogenation to CH4 under methanation condition
is lower than the CO adsorption energy. Forward CTKA measurements
reveal that O hydrogenation to H2O is also a relatively
slow step compared to CO dissociation. The combined transient kinetic
data are used to fit an explicit microkinetic model for the methanation
reaction. The mechanism involving direct CO dissociation represents
the data better than a mechanism in which H-assisted CO dissociation
is assumed. Microkinetics simulations based on the fitted parameters
confirms that under methanation conditions the overall CO consumption
rate is mainly controlled by C hydrogenation and to a smaller degree
by O hydrogenation and CO dissociation. These simulations are also
used to explore the influence of CO and H2 partial pressure
on possible rate-controlling steps.
Collapse
Affiliation(s)
- Wei Chen
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Robert Pestman
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Bart Zijlstra
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Ivo A. W. Filot
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Emiel J. M. Hensen
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| |
Collapse
|
10
|
Chen W, Filot IAW, Pestman R, Hensen EJM. Mechanism of Cobalt-Catalyzed CO Hydrogenation: 2. Fischer-Tropsch Synthesis. ACS Catal 2017; 7:8061-8071. [PMID: 29226010 PMCID: PMC5716444 DOI: 10.1021/acscatal.7b02758] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 09/24/2017] [Indexed: 11/28/2022]
Abstract
![]()
Fischer–Tropsch
(FT) synthesis is one of the most complex
catalyzed chemical reactions in which the chain-growth mechanism that
leads to formation of long-chain hydrocarbons is not well understood
yet. The present work provides deeper insight into the relation between
the kinetics of the FT reaction on a silica-supported cobalt catalyst
and the composition of the surface adsorbed layer. Cofeeding experiments
of 12C3H6 with 13CO/H2 evidence that CHx surface intermediates
are involved in chain growth and that chain growth is highly reversible.
We present a model-based approach of steady-state isotopic transient
kinetic analysis measurements at FT conditions involving hydrocarbon
products containing up to five carbon atoms. Our data show that the
rates of chain growth and chain decoupling are much higher than the
rates of monomer formation and chain termination. An important corollary
of the microkinetic model is that the fraction of free sites, which
is mainly determined by CO pressure, has opposing effects on CO consumption
rate and chain-growth probability. Lower CO pressure and more free
sites leads to increased CO consumption rate but decreased chain-growth
probability because of an increasing ratio of chain decoupling over
chain growth. The preferred FT condition involves high CO pressure
in which chain-growth probability is increased at the expense of the
CO consumption rate.
Collapse
Affiliation(s)
- Wei Chen
- Laboratory of Inorganic Materials
Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Ivo A. W. Filot
- Laboratory of Inorganic Materials
Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Robert Pestman
- Laboratory of Inorganic Materials
Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Emiel J. M. Hensen
- Laboratory of Inorganic Materials
Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| |
Collapse
|
11
|
Adsorption energy-driven carbon number-dependent olefin to paraffin ratio in cobalt-catalyzed Fischer-Tropsch synthesis. J Catal 2017. [DOI: 10.1016/j.jcat.2017.03.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
12
|
Brush A, McDonald S, Dupré R, Kota S, Mullen GM, Buddie Mullins C. Apparatus for efficient utilization of isotopically-labeled gases in pulse transient studies of heterogeneously catalyzed gas phase reactions. REACT CHEM ENG 2017. [DOI: 10.1039/c7re00038c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transient techniques, such as steady state isotopic transient kinetic analysis (SSITKA), are powerful methods for determining various mechanistic and kinetic insights into heterogeneously catalyzed gas-phase reactions.
Collapse
Affiliation(s)
- Adrianna Brush
- McKetta Department of Chemical Engineering
- University of Texas at Austin
- C0400 Austin
- USA
| | - Shallaco McDonald
- McKetta Department of Chemical Engineering
- University of Texas at Austin
- C0400 Austin
- USA
| | - Robin Dupré
- McKetta Department of Chemical Engineering
- University of Texas at Austin
- C0400 Austin
- USA
| | - Shruti Kota
- McKetta Department of Chemical Engineering
- University of Texas at Austin
- C0400 Austin
- USA
| | - Gregory M. Mullen
- McKetta Department of Chemical Engineering
- University of Texas at Austin
- C0400 Austin
- USA
| | - C. Buddie Mullins
- McKetta Department of Chemical Engineering
- University of Texas at Austin
- C0400 Austin
- USA
- Department of Chemistry
| |
Collapse
|