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Heat Capacity Characteristics of the Solvation of Ammonium Ions in Mixed Solvent N-Methylpyrrolidone–Water at 298.15 K
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702480
A. N. Novikov, E. I. Kostyleva, S. N. Solovyov
{"title":"Heat Capacity Characteristics of the Solvation of Ammonium Ions in Mixed Solvent N-Methylpyrrolidone–Water at 298.15 K","authors":"A. N. Novikov,&nbsp;E. I. Kostyleva,&nbsp;S. N. Solovyov","doi":"10.1134/S0036024424702480","DOIUrl":"10.1134/S0036024424702480","url":null,"abstract":"<p>Values of standard partial molar heat capacity <span>({{overline {C_{p}^{0}} }_{i}})</span> are determined along with changes <span>(Delta mathop {text{.}}nolimits_{{text{solv}}} C_{{p{text{,}}i}}^{0})</span> in heat capacity during the solvation of ammonium ions in a mixed MP–water solvent at 298.15 K. The value of <span>(Delta mathop {text{.}}nolimits_{{text{solv}}} C_{{p{text{,}}i}}^{0})</span> of ammonium ions is presented as the sum of four contributions: electrostatic, cavity formation, structural changes in the solvent, and specific ion-solvent interactions. Values of the contributions are calculated on the basis of experimental data and model representations. The dependences of the obtained values on the composition of the mixture are discussed in connection with the structure of the mixed solvent.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"24 - 28"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Physicochemical Properties and Activity of Mn/γ-Al2O3 Catalysts in Propane Conversion to Olefin Hydrocarbons
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702571
A. A. Vosmerikov, A. A. Stepanov, L. N. Vosmerikova, E. Yu. Gerasimov, A. V. Vosmerikov
{"title":"The Physicochemical Properties and Activity of Mn/γ-Al2O3 Catalysts in Propane Conversion to Olefin Hydrocarbons","authors":"A. A. Vosmerikov,&nbsp;A. A. Stepanov,&nbsp;L. N. Vosmerikova,&nbsp;E. Yu. Gerasimov,&nbsp;A. V. Vosmerikov","doi":"10.1134/S0036024424702571","DOIUrl":"10.1134/S0036024424702571","url":null,"abstract":"<p>The physicochemical and catalytic properties of manganese-modified γ-Al<sub>2</sub>O<sub>3</sub> are described. Data on the acidic characteristics of the Mn-containing catalysts were obtained by the temperature-programmed desorption of ammonia; it has been found that the catalysts differ from each other in the distribution and ratio of acid sites of different types. The morphology and structure of Mn/γ-Al<sub>2</sub>O<sub>3</sub> catalyst particles were studied by high-resolution transmission electron microscopy; it has been shown that modification of γ-Al<sub>2</sub>O<sub>3</sub> with manganese does not lead to significant changes in these parameters. It has been found that in the propane conversion process at 650°C, the largest amount of olefin hydrocarbons of 37.8% is formed in the presence of γ-Al<sub>2</sub>O<sub>3</sub> containing 4.0% of manganese at a conversion of 58%, while the lower olefin selectivity achieves 64.2%. The amount and nature of coke deposits formed on the surface of the Mn-containing catalysts during the propane dehydrogenation reaction are determined by differential thermal analysis. It has been shown that the formation of carbon nanofibers near the catalyst surface and the formation of graphite-like carbon layers on the surface of the Al<sub>2</sub>O<sub>3</sub> particles occur during the reaction.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"44 - 52"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Critical Wetting Point in a Liquid Lead–Molten Alkali Metal Halogenide System
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702662
V. P. Stepanov
{"title":"Critical Wetting Point in a Liquid Lead–Molten Alkali Metal Halogenide System","authors":"V. P. Stepanov","doi":"10.1134/S0036024424702662","DOIUrl":"10.1134/S0036024424702662","url":null,"abstract":"<p>The phase transition of surface wetting in two-phase high-temperature systems is analyzed using experimental data on the surface tension of liquid lead and molten sodium, potassium, and cesium halides at the boundary with a gas phase, along with values of the interfacial tension between them. The dependence of the adhesion of the salt melt to the metal on the temperature and nature of the contacting phases was established. Conditions are found for the transition from partial wetting of the metal surface with molten salt to the film regime.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"94 - 97"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Features of Crystallization of Aluminum Phosphate Gels with Various Ratios of Di-n-propylamine/Al2O3 in the Micro-Mesoporous AlPO4-11 Molecular Sieve
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702595
M. R. Agliullin, V. Yu. Guskov, R. Z. Kuvatova, V. V. Lazarev, B. I. Kutepov
{"title":"The Features of Crystallization of Aluminum Phosphate Gels with Various Ratios of Di-n-propylamine/Al2O3 in the Micro-Mesoporous AlPO4-11 Molecular Sieve","authors":"M. R. Agliullin,&nbsp;V. Yu. Guskov,&nbsp;R. Z. Kuvatova,&nbsp;V. V. Lazarev,&nbsp;B. I. Kutepov","doi":"10.1134/S0036024424702595","DOIUrl":"10.1134/S0036024424702595","url":null,"abstract":"<p><b>Abstract</b>—The crystallization of aluminophosphate gels prepared using aluminum isopropoxide with di‑<i>n</i>-propylamine/Al<sub>2</sub>O<sub>3</sub> was equal to 1.0, 1.4, and 1.8. It has been shown that changing the template/Al<sub>2</sub>O<sub>3</sub> ratio in reaction gels leads to the formation of various intermediate phases during crystallization into the AlPO<sub>4</sub>-11 molecular sieve. A method for controlling its secondary porous structure based on regulating the template/Al<sub>2</sub>O<sub>3</sub> ratio is proposed in reaction gels.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"58 - 66"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photocatalytic Oxidation of Oxalic Acid with Oxygen and Ozone in an Aqueous Solution
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702716
A. V. Levanov, A. V. Lapina, O. Ya. Isaikina
{"title":"Photocatalytic Oxidation of Oxalic Acid with Oxygen and Ozone in an Aqueous Solution","authors":"A. V. Levanov,&nbsp;A. V. Lapina,&nbsp;O. Ya. Isaikina","doi":"10.1134/S0036024424702716","DOIUrl":"10.1134/S0036024424702716","url":null,"abstract":"<p><b>Abstract</b>—An experimental study has been carried out on the mineralization of oxalic acid H<sub>2</sub>C<sub>2</sub>O<sub>4</sub> and other oxidation-resistant organic compounds in aqueous solutions under the influence of oxygen, ozone, and ultraviolet radiation. It was found that in acidic solutions H<sub>2</sub>C<sub>2</sub>O<sub>4</sub> does not oxidize under the influence of ozone or UV irradiation in the presence of oxygen; when exposed simultaneously to O<sub>3</sub> + UV it has a low rate of oxidation. The possibility of photocatalysis of the mineralization process by Mn<sup>2+</sup>, MnO<span>(_{4}^{ - })</span>, Fe<sup>3+</sup>, Co<sup>2+</sup>, BrO<span>(_{3}^{ - })</span>, or IO<span>(_{3}^{ - })</span> ions was studied The most effective photocatalysts are Fe<sup>3+</sup> ions: in their presence and under UV irradiation, a fairly rapid oxidation of oxalic acid to CO<sub>2</sub> occurs, as under the influence of O<sub>3</sub> and O<sub>2</sub>. The conditions for maximum ozone conversion during photomineralization of oxalic acid have been found. The possibility of oxidative destruction of a more oxidation-resistant substrate, acetic acid, is shown during ozonation and UV irradiation of solutions with Fe(III) and H<sub>2</sub>C<sub>2</sub>O<sub>4</sub> additives.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"111 - 119"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Introducing Catonization Agents in the Soft Ionization of Short-Chain Peptides: Laser Desorption and Electrospraying
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702686
E. S. Kuznetsova, I. S. Pytsky, A. K. Buryak
{"title":"Introducing Catonization Agents in the Soft Ionization of Short-Chain Peptides: Laser Desorption and Electrospraying","authors":"E. S. Kuznetsova,&nbsp;I. S. Pytsky,&nbsp;A. K. Buryak","doi":"10.1134/S0036024424702686","DOIUrl":"10.1134/S0036024424702686","url":null,"abstract":"<p>A mass spectrometric study is performed of the ionization of short peptides triglycine, alanyl glutamine and prolyl leucine via electrospray ionization (ESI) and surface-activated laser desorption/ionization (SALDI) using copper sulfate crystal hydrate. It is shown that having copper ions in a solution during ERI ionization initiates the aggregation of peptide molecules with the formation of large associates of up to 7–8 peptide molecules. The effect the nature of peptides has on that of ionization is studied. During SALDI ionization, there is competitive cationization of peptide molecules by copper ions, accompanied by the formation of ions M + Cu<sup>+</sup>. The fragmentation of peptides and the copper cationization of decarboxylation products are also characteristic.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"98 - 104"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Erratum to: Solid-Phase Equilibrium Diagram of the Bi2Te3-Rich Corner of MnTe–Bi2Te3–Te System and Thermodynamic Properties of the Intermediate Phases
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024425010017
Elnur N. Orujlu, Eldar I. Ahmadov, Najaf I. Orujov, Mahammad B. Babanly
{"title":"Erratum to: Solid-Phase Equilibrium Diagram of the Bi2Te3-Rich Corner of MnTe–Bi2Te3–Te System and Thermodynamic Properties of the Intermediate Phases","authors":"Elnur N. Orujlu,&nbsp;Eldar I. Ahmadov,&nbsp;Najaf I. Orujov,&nbsp;Mahammad B. Babanly","doi":"10.1134/S0036024425010017","DOIUrl":"10.1134/S0036024425010017","url":null,"abstract":"","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"130 - 130"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermochemistry of the Dissolution of Tetra-4-carboxyphthalocyanine Hydroxyaluminum in Aqueous Solutions of KOH at 298.15 K
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702479
P. D. Krutov, V. E. Maizlish, O. N. Krutova, T. R. Usacheva, M. I. Bazanov, M. V. Chislov, E. E. Kiptikova
{"title":"Thermochemistry of the Dissolution of Tetra-4-carboxyphthalocyanine Hydroxyaluminum in Aqueous Solutions of KOH at 298.15 K","authors":"P. D. Krutov,&nbsp;V. E. Maizlish,&nbsp;O. N. Krutova,&nbsp;T. R. Usacheva,&nbsp;M. I. Bazanov,&nbsp;M. V. Chislov,&nbsp;E. E. Kiptikova","doi":"10.1134/S0036024424702479","DOIUrl":"10.1134/S0036024424702479","url":null,"abstract":"<p>A study is performed of tetra-4-carboxyphthalocyanine hydroxyaluminum. The thermal effects of the dissolution of crystalline phthalocyanine in aqueous solutions with different concentrations of KOH are determined via direct calorimetry at a temperature of 298.15 K. The thermal effects of stepwise dissociation AlOHРс(4-COOH)<sub>4</sub> are calculated using the HEAT computer program. The enthalpies of combustion of the studied compound are determined with an IKA C6000 isoperibol calorimeter (bomb calorimetry) and used to calculate the standard enthalpies of formation of AlOHРс(4-COOH)<sub>4</sub> along with products of its dissociation in aqueous solutions.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"19 - 23"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Towards Semiempirical Analysis of Exchange Interactions in Metalorganic Frameworks with Open d-Shell Ions
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702601
A. L. Tchougreéff
{"title":"Towards Semiempirical Analysis of Exchange Interactions in Metalorganic Frameworks with Open d-Shell Ions","authors":"A. L. Tchougreéff","doi":"10.1134/S0036024424702601","DOIUrl":"10.1134/S0036024424702601","url":null,"abstract":"<p>The MagAîxTic program package, which is based on the theory of effective Hamiltonian for crystal field and is used to estimate the parameters of effective exchange between magnetic moments in the <i>d</i>‑shells, is augmented by the smaller ferromagnetic contributions to those parameters. The updated package is tested based on the example of the three-nuclear basic acetates of iron(III) and chromium(III) of the composition <span>(mu )</span><sup>3</sup>-O<i>M</i><sub>3</sub>(RCOO)<sub>6</sub>, as well as of their mixed analogs. It is shown that the developed/upgraded package is able to reproduce either orders of magnitude of the exchange parameters in the range of dozens cm<sup>–1</sup> or their trends upon transition from one metal to another.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"67 - 74"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synchrotron Radiation in Solving Problems of Optimizing Properties of Aluminum Powders As Metallic Fuels and Raw Materials for Additive Technologies
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI: 10.1134/S0036024424702455
D. A. Eselevich, V. G. Shevchenko, Z. S. Vinokurov, B. P. Tolochko
{"title":"Synchrotron Radiation in Solving Problems of Optimizing Properties of Aluminum Powders As Metallic Fuels and Raw Materials for Additive Technologies","authors":"D. A. Eselevich,&nbsp;V. G. Shevchenko,&nbsp;Z. S. Vinokurov,&nbsp;B. P. Tolochko","doi":"10.1134/S0036024424702455","DOIUrl":"10.1134/S0036024424702455","url":null,"abstract":"<p>Thermogravimetry (TG), differential scanning calorimetry (DSC), and the X-ray diffraction of synchrotron radiation are used to study the reactivity and formation of phases during the oxidation of aluminum-based powders in the course of programmed heating. It is shown that the combination of thermal and phase analysis using synchrotron radiation gives an idea of the mechanism of rapid oxidation in order to accelerate the selecting of modifiers to optimize the properties of dispersed systems based on aluminum, and the technological parameters of synthesizing materials with controlled properties.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"1 - 18"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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