Assessing the Role of Site Isolation and Compartmentalization in Packed-Bed Flow Reactors for Processes Involving Wolf-and-Lamb Scenarios

ACS Catalysis ◽  
2021 ◽  
pp. 6234-6242
Author(s):  
Parijat Borah ◽  
Mauro Fianchini ◽  
Miquel A. Pericàs
Keyword(s):  
Packed Bed ◽  
Site Isolation ◽  
Flow Reactors

scholarly journals Towards a Novel Computer-Aided Optimization of Microreactors: Techno-Economic Evaluation of an Immobilized Enzyme System

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 524
Author(s):  
Philip Pietrek ◽  
Manfred Kraut ◽  
Roland Dittmeyer
Keyword(s):  
Magnetic Beads ◽  
Glucose Dehydrogenase ◽  
Packed Bed ◽  
Detailed Knowledge ◽  
Reaction Conditions ◽  
Flow Reactors ◽  
Continuous Flow Reactors ◽  
Enzyme Cascades ◽  
And Control ◽  
Physical And Chemical

Immobilized multi-enzyme cascades are increasingly used in microfluidic devices. In particular, their application in continuous flow reactors shows great potential, utilizing the benefits of reusability and control of the reaction conditions. However, capitalizing on this potential is challenging and requires detailed knowledge of the investigated system. Here, we show the application of computational methods for optimization with multi-level reactor design (MLRD) methodology based on the underlying physical and chemical processes. We optimize a stereoselective reduction of a diketone catalyzed by ketoreductase (Gre2) and Nicotinamidadenindinukleotidphosphat (NADPH) cofactor regeneration with glucose dehydrogenase (GDH). Both enzymes are separately immobilized on magnetic beads forming a packed bed within the microreactor. We derive optimal reactor feed concentrations and enzyme ratios for enhanced performance and a basic economic model in order to maximize the techno-economic performance (TEP) for the first reduction of 5-nitrononane-2,8-dione.

Role of Water on the Precipitation and Deposition of Asphaltenes in Packed-Bed Microreactors

2015 ◽  
Vol 54 (16) ◽  
pp. 4103-4112 ◽  
Author(s):  
Chuntian Hu ◽  
Jasmine C. Sabio ◽  
Andrew Yen ◽  
Nikhil Joshi ◽  
Ryan L. Hartman
Keyword(s):  
Packed Bed

Atomistic Insights into Cl–-Triggered Highly Selective Ethylene Electrochemical Oxidation to Epoxide on RuO2: Unexpected Role of the In Situ Generated Intermediate to Achieve Active Site Isolation

ACS Catalysis ◽  
2021 ◽  
pp. 13660-13669
Author(s):  
Jia-Cheng Hong ◽  
Tung-Chun Kuo ◽  
Guo-Lin Yang ◽  
Chi-Tien Hsieh ◽  
Min-Hsiu Shen ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Active Site ◽  
Site Isolation

scholarly journals Plasma Catalytic Conversion of CH4 to Alkanes, Olefins and H2 in a Packed Bed DBD Reactor

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 774
Author(s):  
Mohammadreza Taheraslani ◽  
Han Gardeniers
Keyword(s):  
Barrier Discharge ◽  
Plasma Reactor ◽  
Packed Bed ◽  
Reaction Pathways ◽  
Ambient Conditions ◽  
Alumina Catalyst ◽  
Dbd Plasma ◽  
Hydrogenation Reactions ◽  
Notable Increase

Methane is activated at ambient conditions in a dielectric barrier discharge (DBD) plasma reactor packed with Pd/γ-alumina catalyst containing different loadings of Pd (0.5, 1, 5 wt%). Results indicate that the presence of Pd on γ-alumina substantially abates the formation of deposits, leads to a notable increase in the production of alkanes and olefins and additionally improves the energy efficiency compared to those obtained for the non-packed reactor and the bare γ-alumina packed reactor. A low amount of Pd (0.5 and 1 wt%) favors achieving a higher production of olefins (mainly C2H4 and C3H6) and a higher yield of H2. Increasing Pd loading to 5 wt% promotes the interaction of H2 and olefins, which consequently intensifies the successive hydrogenation of unsaturated compounds, thus incurring a higher production of alkanes (mainly C2H6 and C3H8). The substantial abatement of the deposits is ascribed to the role of Palladium in moderating the strength of the electric and shifting the reaction pathways, in the way that hydrogenation reactions of deposits’ precursors become faster than their deposition on the catalyst.

Unravelling the role of active-site isolation in reactivity and reaction pathway control for acetylene hydrogenation

2020 ◽  
Vol 56 (47) ◽  
pp. 6372-6375
Author(s):  
Siyang Liu ◽  
Yiming Niu ◽  
Yongzhao Wang ◽  
Junnan Chen ◽  
Xueping Quan ◽  
...  
Keyword(s):  
Active Site ◽  
Bimetallic Catalysts ◽  
Reaction Pathway ◽  
Isolation Effect ◽  
Site Isolation ◽  
Acetylene Hydrogenation ◽  
Supported Pd

Supported PdxCuy bimetallic catalysts were prepared and characterized to illustrate the active-site isolation effect on controlling the reactivity and reaction pathway of acetylene hydrogenation.

Mathematical Modeling of the Paired Electro‐organic Syntheses in Packed Bed Flow Reactors: II . Gluconate and Sorbitol from Glucose

1988 ◽  
Vol 135 (6) ◽  
pp. 1400-1406 ◽  
Author(s):  
Jimmy C. Yu ◽  
M. M. Baizer ◽  
Ken Nobe
Keyword(s):  
Mathematical Modeling ◽  
Packed Bed ◽  
Flow Reactors ◽  
Organic Syntheses

scholarly journals Catalysis-in-a-Box: Robotic Screening of Catalytic Materials in the Time of COVID-19

2020 ◽  
Author(s):  
Gaurav Kumar ◽  
Hannah Bossert ◽  
Daniel McDonald ◽  
Anargyros Chatzidmitriou ◽  
M. Alexander Ardagh ◽  
...  
Keyword(s):  
Flow Reactor ◽  
Low Cost ◽  
Packed Bed ◽  
Reaction Rates ◽  
Laboratory Scale ◽  
Materials Testing ◽  
Kinetic Measurements ◽  
Flow Reactors ◽  
Activation Barriers ◽  
Micro Flow

<p></p><p>The emergence of a viral pandemic has motivated the transition away from traditional, labor-intensive materials testing techniques to new automated approaches without compromising on data quality and at costs viable for academic laboratories. Reported here is the design and implementation of an autonomous micro-flow reactor for catalyst evaluation condensing conventional laboratory-scale analogues within a single gas chromatograph (GC), enabling the control of relevant parameters including reactor temperature and reactant partial pressures directly from the GC. Inquiries into the hydrodynamic behavior, temperature control, and heat/mass transfer were sought to evaluate the efficacy of the micro-flow reactor for kinetic measurements. As a catalyst material screening example, a combination of four Brønsted acid catalyzed probe reactions, namely the dehydration of ethanol, 2-propanol, 1-butanol, and the dehydra-decyclization of 2-methyltetrahydrofuran on a solid acid HZSM-5 (Si/Al 140), were carried out in the temperature range 403-543 K for the measurement of apparent reaction kinetics. Product selectivities, proton-normalized reaction rates, and apparent activation barriers were in agreement with measurements performed on conventional packed bed flow reactors. Furthermore, the developed micro-flow reactor was demonstrated to be about ten-fold cheaper to fabricate than commercial automated laboratory-scale reactor setups and is intended to be used for kinetic investigations in vapor-phase catalytic chemistries, with the key benefits including automation, low cost, and limited experimental equipment instrumentation.</p><p></p>

Cost analysis of oil cake-to-biodiesel production in packed-bed micro-flow reactors with immobilized lipases

2019 ◽  
Vol 128 (1) ◽  
pp. 98-102 ◽  
Author(s):  
Sandra Budžaki ◽  
Smitha Sundaram ◽  
Marina Tišma ◽  
Volker Hessel
Keyword(s):  
Cost Analysis ◽  
Packed Bed ◽  
Biodiesel Production ◽  
Flow Reactors ◽  
Immobilized Lipases ◽  
Micro Flow

CO2 hydration by immobilized carbonic anhydrase in Robinson–Mahoney and packed-bed scrubbers—Role of mass transfer and inhibitor removal

2012 ◽  
Vol 73 ◽  
pp. 99-115 ◽  
Author(s):  
Faïçal Larachi ◽  
Olivier Lacroix ◽  
Bernard P.A. Grandjean
Keyword(s):  
Mass Transfer ◽  
Carbonic Anhydrase ◽  
Packed Bed
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