Unravelling acidity–selectivity relationship in the bifunctional process of Fischer-Tropsch synthesis and catalytic cracking

Deviana, Deviana; Rhim, Geun Bae; Kim, Young Eun; Lee, Hyeon Song; Lee, Gyoung Woo; Youn, Myung-Joong; Kim, Kwang Young; Koo, Kee Young; Park, Jin-Won; Chun, Dong Hyun

doi:10.1016/j.cej.2022.140646

Cited by 8 publications

(4 citation statements)

References 57 publications

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“…With an increasing magnitude of acidity, the cracking activity increases until it reaches a threshold of −140 kJ/mol ammonia desorption heat, where other relationships must be considered (Niwa et al, 2010). It is reported that the overall conversion is proportional to the number of Brønsted acid sites (Deviana et al, 2023). Longer Chains are more likely to be cracked (Abbot and Dunstan, 1997).…”

Section: Reaction Mechanismsmentioning

confidence: 99%

“…They further enhanced the selectivity toward 72 wt% kerosene by substituting Na for La and obtained excellent stability of CO conversion and selectivity. Another study used a P-Fe catalyst mixed with H-ZSM-5 and yielded CO conversion of 73%-78% with a C5-C20 selectivity of 72 wt% vs. 36 wt% without H-ZSM-5 (Deviana et al, 2023). Papeta et al (2023) investigated Co with H-Beta zeolite and reached 73.4 wt% toward C5+.…”

Section: Influence On Product Selectivitymentioning

confidence: 99%

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Insights into Fischer–Tropsch catalysis: current perspectives, mechanisms, and emerging trends in energy research

Keunecke,

Dossow,

Dieterich

et al. 2024

Front. Energy Res.

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Fischer–Tropsch (FT) synthesis is an important module for the production of clean and sustainable fuels and chemicals, making it a topic of considerable interest in energy research. This mini-review covers the current literature on FT catalysis and offers insights into the primary products, the nuances of the FT reaction, and the product distribution, with particular attention to the Anderson–Schulz–Flory distribution (ASFD) and known deviations from this fundamental concept. Conventional FT catalysts, particularly Fe- and Co-based catalysis systems, are reviewed, highlighting their central role and the influence of water and water–gas shift (WGS) activity on their catalytic behavior. Various mechanisms of catalyst deactivation are also investigated, and the high methanation activity of Co-based catalysts is illustrated. To make this complex field accessible to a broader audience, we explain conjectured reaction mechanisms, namely, the carbide mechanism and CO insertion. We discuss the complex formation of a wide range of products, including olefins, kerosenes, branched hydrocarbons, and by-products such as alcohols and oxygenates. The article goes beyond the traditional scope of FT catalysis by addressing topics of current interest, including the direct hydrogenation of CO2 for power-to-X applications and the use of bifunctional catalysts to produce tailored FT products, most notably for the production of sustainable aviation fuel (SAF). This mini-review provides a holistic overview of the evolving landscape of FT catalysts and is aimed at both experienced researchers and those new to the field while covering current and emerging trends in this important area of energy research.

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Section: Reaction Mechanismsmentioning

confidence: 99%

Section: Influence On Product Selectivitymentioning

confidence: 99%

Insights into Fischer–Tropsch catalysis: current perspectives, mechanisms, and emerging trends in energy research

Keunecke,

Dossow,

Dieterich

et al. 2024

Front. Energy Res.

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show abstract

“…Catalytic cracking unit (CCU) is one of the processing units in the petroleum refining industry, used to convert heavy petroleum fractions into high-value-added products such as gasoline, diesel, and light hydrocarbons [1][2][3]. In response to increasingly severe environmental challenges and market demands, optimization and control of catalytic cracking technology have become particularly important over the past few decades, with continuous advancement of computer technology and control theory.…”

Section: Introductionmentioning

confidence: 99%

“…We can conclude that ∑ ∞ k=1 η(k) < ∞, and χ(k) converges to a finite random variable χ(c), denoted as lim k→∞ χ(k) = χ(c). For any sequence of bounded measurement vectors {ϕ(k)}, the algorithm exhibits the following characteristics: (1) || θ(k)|| remains bounded and non-increasing (2). The noise bound γ to be estimated remains bounded.…”

mentioning

confidence: 99%

An Adaptive-Noise-Bound-Based Set-Membership Method for Process Identification of Industrial Control Loops

Wang,

Zhang

2023

Processes

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Modeling of key variable data needs to consider the complex characteristics of systems in the catalytic cracking unit (CCU) of petroleum refining process, such as slow time-varying behavior, complex dynamic properties, distributed traits, and unknown stochastic noise. To fully capture the dynamics of a linear ordinary dynamic process without introducing incremental components, an adaptive-noise-bound-based set-membership method (RSMI) is proposed in this paper. Under the set-membership framework, the output set is typically represented as an ellipsoid based on the assumed conditions. Firstly, a CARMA model is considered; longer-duration historical data are selected to capture the intricate dynamic characteristics of industrial control loops. Secondly, RSMI introduces am approach to determine allowance factor, optimizing the noise bound for better suitability in real-world noise environments. The adaptive noise bound is achieved by designing an optimization algorithm that seeks the optimal parameters within the optimization framework. The stability of the RSMI algorithm is demonstrated through the application of the Lyapunov method. Next, the RSMI algorithm has been applied in engineering practice and designed for offline and online training stages of control processes. Finally, simulation experiments are performed to model and predict real-time data of flow, pressure, and liquid-level control loops within a catalytic cracking unit. Furthermore, the effectiveness of the RSMI algorithm is validated through two general examples, and frequency domain analysis is performed.

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Selective peroxidation of isobutane with molecular oxygen over molybdenum oxide catalyst for direct synthesis of di-tert-butyl peroxide

Li,

Yuan,

Cui

et al. 2023

Chemical Engineering Journal

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Unravelling acidity–selectivity relationship in the bifunctional process of Fischer-Tropsch synthesis and catalytic cracking

Cited by 8 publications

References 57 publications

Insights into Fischer–Tropsch catalysis: current perspectives, mechanisms, and emerging trends in energy research

Insights into Fischer–Tropsch catalysis: current perspectives, mechanisms, and emerging trends in energy research

An Adaptive-Noise-Bound-Based Set-Membership Method for Process Identification of Industrial Control Loops

Selective peroxidation of isobutane with molecular oxygen over molybdenum oxide catalyst for direct synthesis of di-tert-butyl peroxide

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