Modelling of a microreactor for the partial oxidation of 1-butanol on a titania supported gold catalyst

Khan, Yaseen; Kilpiö, Teuvo; Marin, Minna; Russo, Vincenzo; Lehtonen, Juha; Karinen, Reetta; Salmi, Tapio

doi:10.1016/j.ces.2020.115695

Cited by 12 publications

(8 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, the choice of support was also crucial and has been linked to the high catalytic activity of many Aubased catalysts. [30][31][32][33][34] However, in this study, the unsaturated Au sites were the active species. At an 8 h reaction time, attempts to use the support for the oxidative coupling of 1 a to azobenzene resulted in a reduced 2 a yield and selectivity (Table 1, entry 17); however, when the reaction time was increased to 16 h, the conversion and yield improved somewhat (Table 1, entry 18).…”

Section: Catalyst Screeningmentioning

confidence: 56%

“…Likewise, increasing the time up to 24 h did not significantly improve the reaction, but instead, it gave a trace amount of the product (Table 1, entry 11–16). Besides, the choice of support was also crucial and has been linked to the high catalytic activity of many Au‐based catalysts [30–34] . However, in this study, the unsaturated Au sites were the active species.…”

Section: Resultsmentioning

confidence: 84%

See 1 more Smart Citation

Bifunctional Cs−Au/Co₃O₄ (Basic and Redox)‐Catalyzed Oxidative Synthesis of Aromatic Azo Compounds from Anilines

et al. 2021

View full text Add to dashboard Cite

An eco-friendly alkali-promoted (CsÀ Au/Co 3 O 4 ) catalyst, with redox and basic properties for the oxidative dehydrogenative coupling of anilines to symmetrical and unsymmetrical aromatic azo compounds, was developed. We realized a base additiveand molecular O 2 oxidant-free process (using air), with reasonable reusability of the catalyst achieved under milder reaction conditions. Notably, the enhanced catalytic activity was also linked to the increased basic site concentration, low reduction temperatures, and the effect of lattice oxygen on the nanomaterials. The increased basic strength of the cation-promoted catalyst improved the electron density of the active Au species, resulting in higher yields of the desired aromatic azo compounds.

show abstract

Section: Catalyst Screeningmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 84%

Bifunctional Cs−Au/Co₃O₄ (Basic and Redox)‐Catalyzed Oxidative Synthesis of Aromatic Azo Compounds from Anilines

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The usual method of generating droplets (emulsion) consists of uneven droplet size and irregular mixing and dispersion. Moreover, the process needs additional energy input for stabilizing emulsion [ 13 , 14 ]. The slug flow microreactor provides an effective solution with minimal energy input for the dispersion of droplets.…”

Section: Microstructure Reactors Design Principlesmentioning

confidence: 99%

“…In many cases, a centrally mounted orifice is used to create the discrete segmented flow, where the droplet of the immiscible phase will be smaller than that of the orifice opening and the phases are well mixed due to a pressure difference. The orifice opening or any obstacle to the flow will disturb the central fluid stream and this destabilization will be helpful for the formation of segments in the channel [ 14 , 17 , 18 ]. Surfactants present in the continuous phase can be used for the stabilization of droplets in the channel.…”

Section: Microstructure Reactors Design Principlesmentioning

confidence: 99%

Process Intensification Approach Using Microreactors for Synthesizing Nanomaterials—A Critical Review

et al. 2021

View full text Add to dashboard Cite

Nanomaterials have found many applications due to their unique properties such as high surface-to-volume ratio, density, strength, and many more. This review focuses on the recent developments on the synthesis of nanomaterials using process intensification. The review covers the designing of microreactors, design principles, and fundamental mechanisms involved in process intensification using microreactors for synthesizing nanomaterials. The microfluidics technology operates in continuous mode as well as the segmented flow of gas–liquid combinations. Various examples from the literature are discussed in detail highlighting the advantages and disadvantages of microfluidics technology for nanomaterial synthesis.

show abstract

“…[ 11,16 ] Nowadays, vanadium‐based catalysts are extensively used in the catalytic oxidation of alcohols with a stoichiometric amount of H 2 O 2 , TBHP, or dioxygen. [ 14a,17,c–d ] Due to the immense importance of alcohol oxidation reactions, a variety of catalytic systems, like homogeneous, [ 17i,18 ] heterogeneous, [ 19 ] biphasic, [ 20 ] or gas phase, [ 21 ] have been developed. A range of catalytic systems based on metals [ 21b,22 ] (especially transition metals) and nonmetals [ 23 ] are also found in the literature for the catalytic conversion of alcohols.…”

Section: Introductionmentioning

confidence: 99%

Solvent‐free oxidation of straight‐chain aliphatic primary alcohols by polymer‐grafted vanadium complexes

Kachhap

Chaudhary

Haldar

2021

Applied Organom Chemis

View full text Add to dashboard Cite

Oxidovanadium(IV) complexes [VO(tertacac)2] (1), [VO(dipd)2] (2), and [VO(phbd)2] (3) were synthesized by reacting [VO(acac)2] with 2,2,6,6‐tetramethyl‐3,5‐hepatanedione, 1,3‐diphenyl‐1,3‐propanedione, and 1‐phenyl‐1,3‐butanedione, respectively. Imidazole‐modified Merrifield resin was used for the heterogenization of complexes 1–3. During the process of heterogenization, the V4+ center in complex 2 converts into V5+, whereas the other two complexes 1 and 3 remain in the oxidovanadium(IV) state in the polymer matrix. Theoretically, calculated IPA values of 1–3 suggest that 2 is prone to oxidation compared with 1 and 3, which was also supported by the absence of EPR lines in 5. Polymer‐supported complexes Ps‐Im‐[VIVO(tertacac)2] (4), Ps‐Im‐[VVO2(dipd)2] (5), and Ps‐Im‐[VIVO(phbd)2] (6) were applied for the solvent‐free heterogenous oxidation of a series of straight‐chain aliphatic alcohols in the presence of H2O2 at 60°C and showed excellent substrate conversion specially for the alcohols with fewer carbon atoms. Higher reaction temperature improves the substrate conversion significantly for the alcohols containing more carbon atoms such as 1‐pentanol, 1‐hexanol, and 1‐heptanol while using optimized reaction conditions. However, alcohols with fewer carbon atoms seem less affected by reaction temperatures higher than the optimized temperature. A decreasing trend in the selectivity(%) of carboxylic acid was observed with increasing carbon atoms among the examined alcohols, whereas the selectivity towards aldehydes increased. The order of efficiency of the supported catalysts is 4 > 6 > 5 in terms of turnover frequency (TOF) values and substrate conversion, further supported by theoretical calculations.

show abstract

Modelling of a microreactor for the partial oxidation of 1-butanol on a titania supported gold catalyst

Cited by 12 publications

References 93 publications

Bifunctional Cs−Au/Co₃O₄ (Basic and Redox)‐Catalyzed Oxidative Synthesis of Aromatic Azo Compounds from Anilines

Bifunctional Cs−Au/Co₃O₄ (Basic and Redox)‐Catalyzed Oxidative Synthesis of Aromatic Azo Compounds from Anilines

Process Intensification Approach Using Microreactors for Synthesizing Nanomaterials—A Critical Review

Solvent‐free oxidation of straight‐chain aliphatic primary alcohols by polymer‐grafted vanadium complexes

Contact Info

Product

Resources

About

Modelling of a microreactor for the partial oxidation of 1-butanol on a titania supported gold catalyst

Cited by 12 publications

References 93 publications

Bifunctional Cs−Au/Co3O4 (Basic and Redox)‐Catalyzed Oxidative Synthesis of Aromatic Azo Compounds from Anilines

Bifunctional Cs−Au/Co3O4 (Basic and Redox)‐Catalyzed Oxidative Synthesis of Aromatic Azo Compounds from Anilines

Process Intensification Approach Using Microreactors for Synthesizing Nanomaterials—A Critical Review

Solvent‐free oxidation of straight‐chain aliphatic primary alcohols by polymer‐grafted vanadium complexes

Contact Info

Product

Resources

About

Bifunctional Cs−Au/Co₃O₄ (Basic and Redox)‐Catalyzed Oxidative Synthesis of Aromatic Azo Compounds from Anilines

Bifunctional Cs−Au/Co₃O₄ (Basic and Redox)‐Catalyzed Oxidative Synthesis of Aromatic Azo Compounds from Anilines