Reaction Chemistry & Engineering最新文献

{"title":"Correction: Intensification of silver nanoparticle synthesis through continuous flow split and recombine microreactors","authors":"Amritendu Bhuson Ghosh, Rakesh Kumar and Arnab Atta","doi":"10.1039/D5RE90004B","DOIUrl":"https://doi.org/10.1039/D5RE90004B","url":null,"abstract":"<p >Correction for ‘Intensification of silver nanoparticle synthesis through continuous flow split and recombine microreactors’ by Amritendu Bhuson Ghosh <em>et al.</em>, <em>React. Chem. Eng.</em>, 2024, <strong>9</strong>, 1707–1720, https://doi.org/10.1039/D4RE00025K.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 3","pages":" 721-721"},"PeriodicalIF":3.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/re/d5re90004b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143489302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction: Rare-earth doped hexagonal NaYbF4 nanoprobes with size-controlled and NIR-II emission for multifunctional applications","authors":"Yu Min, Xin Ding, Bing Yu, Hailin Cong and Youqing Shen","doi":"10.1039/D5RE90005K","DOIUrl":"https://doi.org/10.1039/D5RE90005K","url":null,"abstract":"<p >Correction for ‘Rare-earth doped hexagonal NaYbF<small>₄</small> nanoprobes with size-controlled and NIR-II emission for multifunctional applications’ by Yu Min <em>et al.</em>, <em>React. Chem. Eng.</em>, 2023, <strong>8</strong>, 2258–2269, https://doi.org/10.1039/D3RE00168G.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 3","pages":" 719-720"},"PeriodicalIF":3.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/re/d5re90005k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143489301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modification of acidic groups over zeolites via calcination for the selective catalytic transformation of 2,3-butanediol in ethylene glycol","authors":"Shuo Ai, Kaili Gao, Zhenhua Huang, Linghui Liu and Wanguo Yu","doi":"10.1039/D4RE00278D","DOIUrl":"https://doi.org/10.1039/D4RE00278D","url":null,"abstract":"<p >Biomass and bio-derived chemicals can be transformed into ethylene glycol (EG) <em>via</em> catalytic hydrogenation, but a small amount of 2,3-butanediol (23BDO) is generated. 23BDO in EG was removed <em>via</em> the dehydration reaction over H-beta zeolite calcined at 800 °C, with a 23BDO conversion of 80.4% and corresponding SF value of 17.1, which was almost thrice that over the original zeolite due to the suppression of ketalization and oligomerization reactions of EG, especially the latter. The conversions of C<small>_3–6</small> diols depended on the numbers of carbon atoms due to a positive effect of the alkyl group on their reactivity, with five-fold SF values compared to the pristine zeolite. The pore and crystal structures of the zeolite were disturbed to a small extent after calcination, resulting in its weakened catalytic activity. The NH<small>₃</small>-TPD result proved that the number of acid sites was significantly reduced after calcination, and the ratios of medium and strong acid sites were slightly decreased. The thermal decomposition of Si(OH)Al (Brønsted acid) and EFAL groups (Lewis acid) was confirmed by FTIR. The order of the EG oligomerization reaction with respect to catalyst dosage (third order) was higher than that of the ketalization reaction (first order), so the decrease of the number of acid sites was most unfavorable to EG oligomerization. Compared to the ketalization reaction, the dehydration reaction of 23BDO was less affected after the elimination of EFAL groups, which could not catalyze the dehydration reaction. The used catalyst was regenerated by calcination at 600 °C. The conversions of 23BDO and EG declined to a small and similar degree in the reuse experiment, indicative of the high stability of this modified catalyst.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 5","pages":" 1067-1076"},"PeriodicalIF":3.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vapor phase coupling of n-butanol over the mixed catalyst system PdZn/SiO2 + TiO2†","authors":"Evan C. Wegener","doi":"10.1039/D4RE00474D","DOIUrl":"https://doi.org/10.1039/D4RE00474D","url":null,"abstract":"<p >Coupling fermentation derived oxygenates <em>via</em> Guerbet-type reactions offers a potential route for producing fuels and chemicals from agricultural feedstocks. In this work the vapor phase reactions of <em>n</em>-butanol over a bimetallic PdZn/SiO<small>₂</small> catalyst and physical mixtures of PdZn/SiO<small>₂</small> and TiO<small>₂</small> were studied. The bimetallic catalyst was highly selective for n-butanol dehydrogenation without the subsequent decarbonylation of butanal which is characteristic of monometallic Pd nanoparticles. When combined with TiO<small>₂</small>, a known aldol condensation catalyst, the bifunctional system performs Guerbet-type coupling reactions and produces mixtures of C<small>₈</small> oxygenates and higher-order products including C<small>₇</small>, C<small>₈</small>, and C<small>₁₂</small> hydrocarbons. Results show that within the reaction network PdZn/SiO<small>₂</small> performs dehydrogenation/hydrogenation reactions and decarbonylates C<small>₈</small> aldehydes to form C<small>₇</small> hydrocarbons. TiO<small>₂</small> catalyzes aldol condensation and alcohol dehydration reactions responsible for producing C<small>₈</small> and C<small>₁₂</small> hydrocarbons. Based on the developed understanding of the function of each catalyst, it was shown that increasing the Brønsted acidity of the TiO<small>₂</small> catalyst resulted in an increase in the production of C<small>₈</small> hydrocarbons relative to C<small>₁₂</small> hydrocarbons. This work demonstrates the ability of bimetallic Pd-based catalysts that are selective for alcohol dehydrogenation to participate in Guerbet-type coupling reactions and that their combination with an appropriate aldol condensation/dehydration catalyst is an effective strategy to produce higher molecular weight oxygenates and hydrocarbons from renewable resources.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 906-916"},"PeriodicalIF":3.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Superior photocatalytic activity of Mn vanadate/reduced graphene oxide magnetic nanocomposite for the oxidation of methylene blue dye under sunlight irradiation†","authors":"Fatemeh Rahmatpour and Niaz Monadi","doi":"10.1039/D4RE00314D","DOIUrl":"https://doi.org/10.1039/D4RE00314D","url":null,"abstract":"<p >A magnetic photocatalyst based on reduced graphene oxide and semiconducting MnV<small>₂</small>O<small>₆</small> (rGO/Fe<small>₃</small>O<small>₄</small>/MnV<small>₂</small>O<small>₆</small>) was synthesized by magnetizing the rGO/MnV<small>₂</small>O<small>₆</small> composite for the efficient degradation of methylene blue (MB), a biodegradation-resistant dye. The prepared magnetic photocatalyst was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy, Brunauer–Emmett–Teller surface area analysis, Barrett–Joyner–Halenda (BET-BJH) pore analysis and vibrating sample magnetometry (VSM). Its photocatalytic properties and activity were investigated using UV–Vis diffuse reflectance spectroscopy (DRS), fluorescence spectroscopy and inductively-coupled plasma analysis. The synthesized rGO/Fe<small>₃</small>O<small>₄</small>/MnV<small>₂</small>O<small>₆</small> nanocomposite exhibited a bandgap of 2.59 eV and a specific surface area of 201.5 m<small>²</small> g<small>⁻¹</small>. The optimum photocatalytic conditions for efficient MB photodegradation were determined, and the photocatalytic efficiency was investigated under different light irradiations, including blue and yellow light as well as sunlight. The rGO/Fe<small>₃</small>O<small>₄</small>/MnV<small>₂</small>O<small>₆</small> photocatalyst demonstrated excellent MB degradation efficiency, achieving up to 94% under sunlight irradiation. Additionally, the catalyst exhibited remarkable reusability, maintaining 88% degradation efficiency after the 6th cycle, with negligible structural changes. The magnetic properties of the employed photocatalyst played a key role in facilitating their separation and recycling. The kinetics and mechanism of the photodegradation process were evaluated, revealing a pseudo-first-order rate constant of 0.0882 min<small>⁻¹</small> for a hydroxyl radical-based mechanism. The MB degradation was driven by the generation of superoxide (O<small>₂</small>˙<small>⁻</small>) and hydroxyl (˙OH) free radicals during the reaction.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 876-893"},"PeriodicalIF":3.4,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pr-doped oxygen-vacancy-induced porous NiMoO4 cathode and MoS2-modified CNT anode for constructing ultra-high-performance supercapacitors","authors":"Haoran Li, Tenghao Ma, Tingting Hao, Jian Hao, Jing Wang, Yabin Wang, Zheng Zhao and Chenyu Lei","doi":"10.1039/D4RE00577E","DOIUrl":"https://doi.org/10.1039/D4RE00577E","url":null,"abstract":"<p >In this study, the sol–gel method was used to prepare NiMoO<small>₄</small> electrode materials doped with different concentrations of the rare earth element Pr. The microstructure and phase structure of the samples were thoroughly studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The results showed that the prepared materials were porous nanospheres. Due to their porous spherical shape, these structures showed a large specific surface area, providing more surface area for charge storage and release, which helped in increasing the reaction rate of the electrode, thereby improving the energy storage performance of the capacitor. Since the ionic radius of Pr differed from that of the original metal in NiMoO<small>₄</small>, the size mismatch could result in the removal of oxygen atoms from the crystal lattice, forming oxygen vacancies. The electronic structure of the material was changed, and the number of active sites increased, which affected the electrochemical properties of the material. The electrochemical performance of the rare earth Pr-doped NiMoO<small>₄</small> electrode material (Pr–NiMoO<small>₄</small>) was further tested. The experimental results showed that the Pr–NiMoO<small>₄</small> electrode exhibited excellent electrochemical performance with 0.7% Pr doping, achieving a specific capacity of 2078 F g<small>⁻¹</small> at a current density of 1 Å g<small>⁻¹</small>. Even at a current density of 5 Å g<small>⁻¹</small> and 10 000 charge and discharge cycles, the material retained 98.8% of its capacitance, showing better electrochemical stability than undoped NiMoO<small>₄</small>. An asymmetric supercapacitor was constructed using 0.7% Pr–NiMoO<small>₄</small> material (Pr–NiMoO<small>₄</small>) as the positive electrode material and MoS<small>₂</small>@C as the negative electrode material, showing a high energy density of 73.5 W h kg<small>⁻¹</small>. After 10 000 charge and discharge cycles, the capacitance retention rate of the capacitor could still be maintained at 91.9%. This study successfully proposes an effective strategy for the preparation of rare earth-doped bimetallic oxide electrode materials.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 5","pages":" 1007-1020"},"PeriodicalIF":3.4,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly efficient cobalt-modified hopcalite catalysts prepared through crednerite–spinel transformation†","authors":"D. A. Svintsitskiy, E. S. Kvasova, T. Yu. Kardash, N. A. Sokovikov, O. A. Stonkus and A. I. Boronin","doi":"10.1039/D4RE00552J","DOIUrl":"https://doi.org/10.1039/D4RE00552J","url":null,"abstract":"<p >The work presents a study and comparison of the catalytic properties of hopcalite catalysts composed of copper–manganese and copper–cobalt–manganese spinel particles in the low-temperature CO oxidation reaction. The cubic spinel structure was formed immediately under reaction conditions through the transformation of hydrothermally prepared crednerite CuMn(Co)O<small>₂</small> particles. Both the initial crednerite-type and the resultant spinel-type particles (Cu, Mn, Co)<small>₃</small>O<small>₄</small> exhibited a lamellar morphology and a uniform distribution of elements throughout their bulk and surface. It was found that the modification of the copper–manganese oxide with cobalt resulted in increased particle dispersion and a significant distortion of the crednerite crystal lattice. As a result, this modification reduced the temperature required for the crednerite-to-spinel transformation to 250 °C, whereas the unmodified catalyst is transformed after heating to 350–400 °C only. Furthermore, it was demonstrated that during the CO oxidation at room temperature, the modified spinel particles (Cu, Mn, Co)<small>₃</small>O<small>₄</small> exhibited a specific catalytic activity ∼3.5 times greater than that of the copper–manganese system. This enhancement is associated with the stabilization of a more oxidized surface state for the modified spinel particles, which may involve an increased contribution of Co<small>³⁺</small> and Mn<small>⁴⁺</small> surface species, as well as an enhancement in the overall lattice oxygen mobility.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 5","pages":" 1021-1037"},"PeriodicalIF":3.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depolymerization of polydimethylsiloxanes in ammonia – a new approach to silicone recycling†","authors":"E. O. Minyaylo, A. I. Kudryavtseva, M. N. Temnikov, A. S. Peregudov, A. A. Anisimov and A. M. Muzafarov","doi":"10.1039/D4RE00566J","DOIUrl":"https://doi.org/10.1039/D4RE00566J","url":null,"abstract":"<p >This work presents a new approach to recycling silicone waste: depolymerization in ammonia. The optimal depolymerization conditions (150 °C, 0.25 mL H<small>₂</small>O, 24 h) to achieve complete polymer conversion were developed using a model siloxane fluid PMS-200. The method performance was demonstrated on model unfilled silicone rubbers obtained by classical methods of curing silicone elastomers such as hydrosilylation, condensation of functional groups and radical polymerization in the presence of benzoyl peroxide. The versatility of this approach for recycling both linear silicones (fluids and gums) and filled rubbers (fillers of different nature) was demonstrated. The completeness of the depolymerization and the analysis of the low molecular weight products were tested by SEC, GC and <small>²⁹</small>Si NMR spectroscopy. The scalability of the process has been demonstrated.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 922-930"},"PeriodicalIF":3.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Revelation of the photoexcitation mechanism of COF-DFB materials based on first principles","authors":"Huanjun Su, Yumeng Zhang, Weili Shi, Haoyang Shi, Yani Liu and Ying Lin","doi":"10.1039/D4RE00492B","DOIUrl":"https://doi.org/10.1039/D4RE00492B","url":null,"abstract":"<p >A two-dimensional covalent organic framework (COF) material successfully prepared in the experiment exhibits good light absorption performance, but its internal mechanism is still unclear. A deep understanding of the excitation mechanism of COF materials is of great significance for the preparation and modification of two-dimensional materials. First, the geometric structure of COF-DFB was determined using first-principles and quantum chemical methods, revealing a pore size of 11.62 Å. Secondly, the electron–hole distribution of each excited state of COF-DFB with an oscillator strength greater than 0.1 was further analyzed. It was found that in most excited states of COF-DFB, the electrons are mainly distributed on the TMBP monomer, while the holes are concentrated between TMBP (2,2′,6,6′-tetramethyl-4,4′-bipyridine) and DFB (1,4-diformylbenzene). Finally, the UV-visible spectrum of COF-DFB shows that its maximum absorption wavelength is 413.8 nm. These results indicate that COF-DFB possesses excellent photoelectric properties and demonstrates significant application potential in the field of photocatalysis.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 5","pages":" 999-1006"},"PeriodicalIF":3.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energetical analysis of a method for the scale-up of a microwave flow P-esterification by recirculation†","authors":"József Schindler, István Greiner and György Keglevich","doi":"10.1039/D4RE00622D","DOIUrl":"https://doi.org/10.1039/D4RE00622D","url":null,"abstract":"<p >In a previous communication, we described a flow chemical microwave implementation, where the reaction mixture is circulated. In this way, the given reactor capacity can be increased by up to ten times without any special modifications. It was investigated how the flow rate affects the required number of cycles, and hence the time required to achieve the maximum conversion. The role of the ionic liquid catalyst, and the effect of the increase in the volume on the outcomes were also studied. In this paper, we analyse further the data obtained from an energetic point of view. It was observed that the power of the magnetron of the microwave reactor is consumed by the sets marked by higher flow rates and by increased volumes. The direct esterification of phenyl-<em>H</em>-phosphinic acid with butyl alcohol, which has been previously reported under microwave conditions, was chosen as a model reaction.</p>","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 856-863"},"PeriodicalIF":3.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}