Catalysis Letters最新文献

{"title":"Liquid Phase Nitration of Benzene to Nitrobenzene Using a Mesoporous MoO3/Nb2O5 Nanocatalyst","authors":"Pavan Narayan Kalbande,&nbsp;Bhattu Swapna,&nbsp;Putla Sudarsanam,&nbsp;Shubhangi B. Umbarkar","doi":"10.1007/s10562-025-04981-2","DOIUrl":"10.1007/s10562-025-04981-2","url":null,"abstract":"<p>This work reports the synthesis of a mesoporous MoO₃/Nb₂O₅ catalyst by a facile co-precipitation method for the liquid phase nitration of benzene to nitrobenzene, which is a vital industrial reaction. Pristine Nb₂O₅ and MoO₃/Nb₂O₅ nanocatalysts were characterized using various techniques, including powder XRD, N₂ adsorption-desorption, Raman, SEM/TEM, pyridine FT-IR, and XPS. The MoO₃/Nb₂O₅ catalyst (10 wt% MoO₃ with respect to Nb₂O₅) showed uniform dispersion of Mo and Nb species, higher amount of oxygen vacancies, and more Brønsted acid sites, resulting in a 90% yield of nitrobenzene. In contrast, only 35 and 58% yields were obtained in the case of commercial Nb₂O₅ and nanosized Nb₂O₅, respectively. The liquid phase nitration of benzene was carried out using commercial 65% HNO₃ as a nitrating agent without sulfuric acid. The mesoporous MoO₃/Nb₂O₅ catalyst is structurally stable, as confirmed by the characterization of the spent catalyst. However, a gradual decrease in the yield of nitrobenzene was observed, which could be due to the leaching of MoO₃ species from the catalyst surface.</p>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571099","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}

{"title":"Single-Atom Catalysis for CO Combustion in Automotive Exhaust: A DFT Study","authors":"Li Cai,&nbsp;Chunlan Qin,&nbsp;Lidong Zhang","doi":"10.1007/s10562-025-04983-0","DOIUrl":"10.1007/s10562-025-04983-0","url":null,"abstract":"<div><p>Automotive emissions, particularly carbon monoxide (CO), are a significant environmental concern, and effective catalytic solutions for their treatment are critical for reducing air pollution. Regulating different coordination environments to enhance the catalytic combustion activity of CO on cobalt graphene single-atom catalysts (CoNx-Gr) is an effective method. The possible reaction mechanism pathways of CO on CoNx-Gr were systematically studied through theoretical calculations. By comparing the energy distribution of three mechanisms, the best coordination environment catalyst was screened out, which is the tri-nitrogen coordination with an energy barrier of only 0.40 eV. Compared to the Eley–Rideal (ER) mechanism, CoNx-Gr dominated by the Termolecular Eley–Rideal (TER) mechanism still exhibits high catalytic combustion performance for CO at room temperature. The stability of the CoNx-Gr catalyst was verified through cohesive energy and ab initio molecular dynamics (AIMD) simulations. Microkinetic analysis indicates that increasing the temperature can accelerate the reaction. This work provides valuable theoretical guidance for the design of transition metal single-atom catalysts and contributes to establishing a preliminary catalytic combustion reaction kinetic model.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571100","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}

{"title":"Enhanced Catalytic Performance of Egyptian Red Clay Modified with Zirconia Nanoparticles for Methanol Dehydration to Dimethyl Ether","authors":"Abd El-Aziz A. Said,&nbsp;Mohamed Abd El-Aal,&nbsp;Asmaa Mohamed,&nbsp;Mohamed N. Goda","doi":"10.1007/s10562-025-04959-0","DOIUrl":"10.1007/s10562-025-04959-0","url":null,"abstract":"<div><p>In this study, Egyptian red clay (ERC) was modified with various percentages of ZrO₂ nanoparticles using a chemical precipitation method to test its effectiveness for methanol dehydration into dimethyl ether (DME). The most active catalyst was treated with 5–10 wt. % SO₄²⁻ via impregnation. The physicochemical characteristics of the catalysts were examined using XRD, XRF, FTIR, N₂-sorption, and TEM analysis. Catalyst acidity was assessed through isopropyl alcohol dehydration and interactions with pyridine and 2,6-dimethyl pyridine. Results demonstrated that, the catalytic performance of the ERC was greatly influenced with % ZrO₂, catalyst weight and sulfation process. The 7% SO₄²⁻/20% ZrO₂/ERC catalyst offered a maximum DME yield of ~ 94% at 250 °C with 100% selectivity to DME. This catalyst offered a long-term stability over seven days with almost the same activity and selectivity. Brønsted acidic sites with weak and intermediate strengths were responsible for such enhancement. Our findings highlight the critical roles of specific surface area and acidity in enhancing catalytic performance, positioning ERC-supported zirconia modified with SO₄²⁻ as a cost-effective, environmentally friendly, and recyclable catalyst for DME production.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564486","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}

{"title":"g-C3N4 Enhanced Fe3+/ Fe2+ Cycling to Activate PMS for Pharmaceuticals Degradation Under Solar Irradiation","authors":"Liu Cheng,&nbsp;Zhexin Zhu,&nbsp;Gangqiang Wang,&nbsp;Shiting Du","doi":"10.1007/s10562-025-04979-w","DOIUrl":"10.1007/s10562-025-04979-w","url":null,"abstract":"<div><p>Since Peroxymonosulfate (PMS) is readily available and can produce sulfate radicals with a stronger oxidation capacity, the Fenton-like system Fe²⁺/PMS has gradually replaced Fe²⁺/H₂O₂ system in organic pollutants degradation. However, the Fe³⁺/PMS system has almost no degradation effects, with the conversion of Fe²⁺ to Fe³⁺ being the rate-limiting step in the Fe³⁺/PMS system. In this paper, graphite-like phase carbon nitride (g-C₃N₄) was employed to activate PMS using trace amounts of Fe³⁺ for the treatment of water pollution under sunlight, and the Fe³⁺/g-C₃N₄/PMS system demonstrated the ability to rapidly degrade a wide range of difficult-to-degrade organic pollutants. The Fe³⁺/g-C₃N₄/PMS system was able to completely degrade carbamazepine (CBZ) within 30 min under sunlight. The fundings indicated that this system effectively improved the stringent limitations typically associated with Fenton process regarding the feed ratio of metal ions to oxidants, and could efficiently degrade CBZ across a broad pH range. In addition, the Fe³⁺ concentration of 6.17 × 10⁻⁶ M was used in the experiments to avoid the generation of large amounts of “iron sludge”. The trap burst experiments, DMSO oxidation experiments and electron paramagnetic resonance spectroscopy experiments indicated that O₂<b>·</b>⁻ and ¹O₂ exerted the major effectiveness in the photocatalytic degradation reaction of CBZ, and SO₄<b>·</b>⁻ and <b>·</b>OH jointly promoted the CBZ degradation.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564487","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}

{"title":"Ru Distribution and Activity of Ru/C Catalyst for Continuous Hydrogenation of 3,5-dimethylpyridine","authors":"Kerou Wan,&nbsp;Jie Cheng,&nbsp;Li Zhang,&nbsp;Tao Lin,&nbsp;Mingming Gao,&nbsp;Yuecun Wang,&nbsp;Tong Mou,&nbsp;Yuefeng Li","doi":"10.1007/s10562-025-04969-y","DOIUrl":"10.1007/s10562-025-04969-y","url":null,"abstract":"<div><p>3,5-Dimethylpiperidine (DPI) is a crucial fine chemical used in the pesticide industry. The selective catalytic hydrogenation of DPI is of significant importance for efficient and sustainable production. In this study, we developed a novel, clean continuous process using a trickle bed reactor (TBR) for the hydrogenation of 3,5-dimethylpyridine (DPY) to DPI. This process offers enhanced efficiency, stability, and high-quality DPI production. Via detailed investigation of the impregnation solution pH, along with the distribution and electronic state of Ru species on the Ru/C catalyst, we have revealed the key factors for influencing catalytic performance. The findings provide valuable insights for optimizing catalyst properties, leading to the successful application of Ru/C catalysts in the continuous hydrogenation of pyridine derivatives, including DPY. This work holds significant potential for efficient large-scale continuous production of DPI and related compounds.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553813","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}

{"title":"Studies on Cobalt Nano Particles Supported on Nitrogen-Doped Carbon Catalysts for Selective Hydrogenation of Biomass Derived Furfural","authors":"Yogita,&nbsp;P. N. Anjana,&nbsp;P. Mahesh Kumar,&nbsp;K. T. Venkateshwara Rao,&nbsp;Ch. Subrahmanyam,&nbsp;N. Lingaiah","doi":"10.1007/s10562-025-04962-5","DOIUrl":"10.1007/s10562-025-04962-5","url":null,"abstract":"<p>Inexpensive Co metal-based catalysts are explored for catalytic hydrogenation reactions but their leaching, selectivity and stability issues have realistically debarred their usage. To combat this issue, this work presents stable and selective cobalt supported nitrogen-doped carbon catalysts prepared by using cellulose and melamine as sources for carbon and nitrogen, respectively and pyrolyzed at temperatures ranging from 500 to 800 °C under N₂ atmosphere. The synthesized series of catalysts was examined for hydrogenation of furfural to furfuryl alcohol at 120 °C under 2 MPa of H₂ pressure. All catalysts were characterized through different spectroscopic techniques to build their structural-activity relationship. Here, pyrolysis temperature has shown its supremacy in directing catalyst performance. The catalyst Co/NC-700 exhibited 83% furfural conversion with near 100% selectivity to furfuryl alcohol. The catalytic activity found depended on Co particle size and its crystallinity which was tuned by varying pyrolysis temperature. Pyrolysis temperatures influenced the interaction between N-doped carbon and Co metal, mesoporous structure N-doped carbon support, availability of Co nanoparticles and hydrogen spillover that contributed to the remarkable catalyst efficiency. The catalysts are easy to separate and reusable with consistent activity upon several cycles. Additionally, the extent of the Co/NC-700 catalyst was expanded to hydrogenation of various substituted aldehydes where it yielded decent to excellent yields of alcohols.</p>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553906","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}

{"title":"Enhanced Catalytic Efficiency of CuMn2O4 in Soot Oxidation: An Investigation into Its Synthesis and Characterization","authors":"R. Nithya,&nbsp;A. L. Vikram,&nbsp;Harshini Dasari,&nbsp;S. Nethaji","doi":"10.1007/s10562-025-04955-4","DOIUrl":"10.1007/s10562-025-04955-4","url":null,"abstract":"<p>Diesel particulate filters (DPFs) are essential in mitigating soot emissions. In this study, we synthesized a CuMn₂O₄ catalyst using three distinct methods: sol–gel, hydrothermal, and reflux. The catalysts' structural and morphological characteristics were verified through X-ray diffraction (XRD) and scanning electron microscopy (SEM), while their reducibility properties were assessed via soot-temperature-programmed reduction (TPR). Thermogravimetric analysis (TGA) was employed to evaluate the catalytic performance of each sample in soot oxidation. XRD analysis confirmed the formation of the cubic phase of CuMn₂O₄ across all synthesis methods. SEM analysis revealed varied morphologies, including coral-shaped, non-uniform-shaped, and aggregated spherical structures. Notably, the hydrothermally prepared CuMn₂O₄ exhibited a higher concentration of surface-adsorbed oxygen species, a key factor in catalytic activity. The hydrothermally prepared CuMn₂O₄ exhibited a superior soot oxidation performance due to a higher concentration of surface-adsorbed oxygen species, achieving a T_50% of 417 °C. This study highlights the potential of CuMn₂O₄ catalysts in enhancing the efficiency of DPFs, offering insights into the role of synthesis methods in optimizing catalyst properties for improved environmental applications.</p>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10562-025-04955-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of 1,2,4-Oxadiazole Derivatives via XPhos Pd G3 Catalyzed Buchwald Coupling","authors":"Deepak Kumar,&nbsp;Suryakanta Dalai,&nbsp;Mukesh Jangir","doi":"10.1007/s10562-025-04946-5","DOIUrl":"10.1007/s10562-025-04946-5","url":null,"abstract":"<div><p>The synthesis of oxadiazole compounds is of significant interest due to their diverse applications in pharmaceuticals and materials science. This study investigates the use of XPhos Pd G3 as a catalyst in the Buchwald coupling reaction for the efficient synthesis of 1,2,4-oxadiazole derivatives. The primary objective was to develop a reliable and scalable method to produce these compounds with high yield and purity. Our results demonstrate that the XPhos Pd G3 catalyst significantly enhances the Buchwald coupling process, achieving yields of up to 81% under optimized conditions. The synthesized 1,2,4-oxadiazoles exhibited excellent structural integrity and were characterized using NMR and mass spectrometry. These findings underscore the potential of XPhos Pd G3 as a powerful catalyst in organic synthesis, paving the way for further development of oxadiazole-based compounds with potential applications in drug development and materials science. Future research will focus on exploring the scope of this method across a broader range of substrates and applications.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521719","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}

{"title":"A High-Nickel Nanoflake Catalyst Based on NiFe-LDH and its Application in Efficient Monolithic Water Decomposition","authors":"Jing Wang,&nbsp;Xuan Wang,&nbsp;Shengwei Sun,&nbsp;Yubin Yuan,&nbsp;Tianshuo Wang,&nbsp;Zikang Zhao,&nbsp;Junshuang Zhou,&nbsp;Faming Gao","doi":"10.1007/s10562-025-04935-8","DOIUrl":"10.1007/s10562-025-04935-8","url":null,"abstract":"<div><p>As the potential of hydrogen as a clean energy source continues to be explored, water electrolysis has emerged as a crucial method for producing high-purity hydrogen. In this study, nickel-iron layered double hydroxide (NiFe-LDH) catalysts were successfully synthesized on nickel foam substrates using an “etching + electrodeposition” strategy, with performance significantly enhanced through optimization of the electrodeposition process. The Ni₉@NiFe-LDH/NF catalyst demonstrated outstanding catalytic activity, exhibiting hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) overpotentials of 172.53 mV and 239.31 mV, respectively, at a current density of 100 mA cm^− 2 in 6 M KOH solution. Tafel slope and electrochemical impedance spectroscopy (EIS) analyses revealed rapid electron transfer kinetics and low charge transfer resistance. Long-term stability tests confirmed that the catalyst displayed minimal voltage decay over 10 h, indicating excellent durability. Furthermore, in a two-electrode electrolyzer test conducted at 80 °C, the catalyst required only 1.53 V to achieve a current density of 100 mA cm^− 2. This study presents a low-cost, highly efficient, bifunctional catalyst for water electrolysis, offering promising potential for both optimization and commercial application.</p></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521718","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}

{"title":"Synthesis of (Fe0.2Co0.2Ni0.2Cu0.2Mn0.2)Fe2O4 High Entropy Spinel Oxide for Photo-Fenton Degradation of Oxytetracycline Hydrochloride Over a Wide pH Range","authors":"Yuxin Gan,&nbsp;Dan Liu,&nbsp;Zhipu Wang,&nbsp;Ge Huang,&nbsp;Rumei Ze,&nbsp;Xiaohong Wang,&nbsp;Jiabin Zhou","doi":"10.1007/s10562-025-04973-2","DOIUrl":"10.1007/s10562-025-04973-2","url":null,"abstract":"<div><p>Iron-based spinel oxides, with excellent catalytic activity and stability, hold promising potential in the photo-Fenton degradation of organic pollutants. In this study, (Fe_0.2Co_0.2Ni_0.2Cu_0.2Mn_0.2)Fe₂O₄ was prepared via the solution combustion method. Multiple characterization techniques confirmed the good stability and morphology of (Fe_0.2Co_0.2Ni_0.2Cu_0.2Mn_0.2)Fe₂O₄. It exhibited high-entropy oxide properties, making it suitable as a photo-Fenton catalyst for the efficient degradation of oxytetracycline hydrochloride (OTC-HCl). Under visible light (Vis) with 10 mM H₂O₂, 0.06 g/L OTC-HCl, and pH 4.0, the catalyst achieved a degradation efficiency of 92.9%. In the photo-Fenton system, the utilization rate of H₂O₂ (calculated as the ratio of the degradation amount of OTC-HCl to the consumption amount of H₂O₂) was 34.5, which is 8.3 times higher than that of pure H₂O₂ (4.2). The catalyst showed good acid–base adaptability, achieving OTC-HCl removal rates exceeding 92.0% across a pH range of 3–11, with a reaction rate constant of 0.08 min⁻¹ at pH 11. Free-radical capture experiments showed that (Fe_0.2Co_0.2Ni_0.2Cu_0.2Mn_0.2)Fe₂O₄ catalyzed H₂O₂ to generate <b>·</b>OH, <b>·</b>O₂⁻, and e⁻, which are the main free radicals involved in the degradation of OTC-HCl. In summary, (Fe_0.2Co_0.2Ni_0.2Cu_0.2Mn_0.2)Fe₂O₄ not only addresses the issue of low H₂O₂ utilization in traditional photo-Fenton systems but also catalyzes the generation of H₂O₂ under light conditions. Thus, it can serve as an excellent photo-Fenton catalyst for OTC-HCl degradation.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521721","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}