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Boosting 2,5-furancarboxylic acid formation by improving support surface oxygen activity in AuPd/Ce1-xZrxO2 catalysts 通过提高AuPd/Ce1-xZrxO2催化剂的表面氧活性促进2,5-呋喃羧酸的生成
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-07-06 DOI: 10.1016/j.cattod.2025.115442
Tamara S. Kharlamova , Konstantin L. Timofeev , Vera M. Metalnikova , Leonarda F. Liotta , Olga V. Vodyankina
{"title":"Boosting 2,5-furancarboxylic acid formation by improving support surface oxygen activity in AuPd/Ce1-xZrxO2 catalysts","authors":"Tamara S. Kharlamova ,&nbsp;Konstantin L. Timofeev ,&nbsp;Vera M. Metalnikova ,&nbsp;Leonarda F. Liotta ,&nbsp;Olga V. Vodyankina","doi":"10.1016/j.cattod.2025.115442","DOIUrl":"10.1016/j.cattod.2025.115442","url":null,"abstract":"<div><div>To study the influence of the redox properties of oxide supports on the catalytic properties of AuPd catalysts in the 5-hydroxymethylfurfural (5-HMF) oxidation under weak alkaline conditions, a series of Ce<sub>1-x</sub>Zr<sub>x</sub>O<sub>2</sub> supports (x = 0, 0.5 and 1) and the corresponding bimetallic AuPd/Ce<sub>1-x</sub>Zr<sub>x</sub>O<sub>2</sub> catalysts have been prepared. The samples are studied by X-ray fluorescence spectrometry, X-ray diffraction, Raman spectroscopy, temperature-programmed reduction with hydrogen, and temperature-programmed desorption of ammonia and carbon dioxide. The comparative studies of the AuPd/Ce<sub>1-x</sub>Zr<sub>x</sub>O<sub>2</sub> catalysts show that the active surface oxygen of the Ce-based supports plays a significant role in the aerobic HMF oxidation to 2,5-furancarboxylic acid (FDCA) under weak alkaline conditions (NaHCO<sub>3</sub>, pH ≈ 8) boosting the 2,5-formylfurancarboxylic acid (FFCA) oxidation stage. PdAu/CeO<sub>2</sub> and PdAu/CeZrO<sub>2</sub> provide the FDCC yields of 86 and 71.5 %, respectively, at 80 °C, while the main reaction product for the PdAu/ZrO<sub>2</sub> catalyst is the FFCA intermediate.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"460 ","pages":"Article 115442"},"PeriodicalIF":5.2,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Investigation of NiO/Pd/Al2O3, CuO/Pd/Al2O3 and CoO/Pd/Al2O3 as catalysts for ozone decomposition and as photocatalysts NiO/Pd/Al2O3、CuO/Pd/Al2O3和CoO/Pd/Al2O3作为臭氧分解催化剂和光催化剂的研究
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-07-03 DOI: 10.1016/j.cattod.2025.115439
Katya Milenova , Ivalina Avramova , Katerina Aleksieva
{"title":"Investigation of NiO/Pd/Al2O3, CuO/Pd/Al2O3 and CoO/Pd/Al2O3 as catalysts for ozone decomposition and as photocatalysts","authors":"Katya Milenova ,&nbsp;Ivalina Avramova ,&nbsp;Katerina Aleksieva","doi":"10.1016/j.cattod.2025.115439","DOIUrl":"10.1016/j.cattod.2025.115439","url":null,"abstract":"<div><div>Ozone decomposition over nanosized catalysts Pd/α-Al<sub>2</sub>O<sub>3,</sub> NiO/Pd/α-Al<sub>2</sub>O<sub>3</sub>, CuO/Pd/α-Al<sub>2</sub>O<sub>3</sub> and CoO/Pd/α-Al<sub>2</sub>O<sub>3</sub> was investigated, the catalytic systems were characterized using XRD, SEM, XPS, EPR, IR, (DR) UV–Vis and BET methods. The active NiO, CuO and CoO (10 wt%) phases of the supported catalysts were synthesized using deposition method on precursor Pd/α-Al<sub>2</sub>O<sub>3</sub> (Pd content – 0.15 wt%). Activity of NiO/Pd/α-Al<sub>2</sub>O<sub>3</sub> towards ozone decomposition is highest reaching almost 100 % within 20 min under working conditions. The precursor, containing only Pd shows lowest catalytic activity. The contact surface between catalyst and ozone increase in correlation with the reached activity due to deposition of transition metal oxides over Pd/α-Al<sub>2</sub>O<sub>3</sub>. Photocatalitic decoloration of three model wastewater textile dyes under UV light was also tested. The initial concentration of Reactive Orange 16 (Yellow), Reactive Blue 19 (Blue) and Reactive Red 180 (Red) dyes in water solutions was 20 ppm. The rate constants of NiO/Pd/Al<sub>2</sub>O<sub>3</sub> photocatalysts decreased in the row: 30.4 (Blue) &gt; 19.0 (Yellow) &gt; 7.6 (Red). For CuO containing samples the rate constants are: 22.6 (Blue) &gt; 17.4 (Yellow) &gt; 6.7 (Red). For CoO/Pd/Al<sub>2</sub>O<sub>3</sub> catalysts the values of rate constant are: 13.1 (Blue) &gt; 9.1 (Yellow) &gt; 2.5 (Red). We can conclude that NiO/Pd/Al<sub>2</sub>O<sub>3</sub> has superior performance for all of the three used model contaminates, folowed by CuO/Pd/Al<sub>2</sub>O<sub>3</sub> and CoO/Pd/Al<sub>2</sub>O<sub>3</sub>.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"460 ","pages":"Article 115439"},"PeriodicalIF":5.2,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
3D printed nickel-copper modified CaNaX and NaX zeolites obtained from coal fly ash for sustainable levulinic acid hydrogenation 3D打印镍铜改性煤飞灰CaNaX和NaX沸石可持续乙酰丙酸加氢
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-07-02 DOI: 10.1016/j.cattod.2025.115441
Ivan Dimitrov , Silviya Boycheva , Momtchil Dimitrov , Boian Mladenov , Daniela Kovacheva , Daniela Karashanova , Yavor Mitrev , Margarita Popova
{"title":"3D printed nickel-copper modified CaNaX and NaX zeolites obtained from coal fly ash for sustainable levulinic acid hydrogenation","authors":"Ivan Dimitrov ,&nbsp;Silviya Boycheva ,&nbsp;Momtchil Dimitrov ,&nbsp;Boian Mladenov ,&nbsp;Daniela Kovacheva ,&nbsp;Daniela Karashanova ,&nbsp;Yavor Mitrev ,&nbsp;Margarita Popova","doi":"10.1016/j.cattod.2025.115441","DOIUrl":"10.1016/j.cattod.2025.115441","url":null,"abstract":"<div><div>Coal fly ash zeolites with Na(Ca)X structure with different Ca and Fe content were synthesized by ultrasound-assisted double stage fusion-hydrothermal synthesis. Bimetallic Ni-Cu supported catalysts with different nickel (5–10 wt%) and copper (2.5–5 wt%) content were prepared by post-synthesis incipient wetness impregnation. 3D printing technique was applied for the catalysts preparation after modification with metal precursors. The catalysts were characterized by X-ray powder diffraction (XRD), Temperature programmed reduction with derivative thermogravimetry (TPR-DTG), N<sub>2</sub> physisorption and Transmission electron microscopy (TEM). It was found that crystalline Ni<sub>x</sub>Cu<sub>y</sub> intermetallic nanoparticles with different x/y ratio were formed in the reduced catalysts and they affected the reducibility and catalytic performance of the active nickel phases. The 3D printed catalysts were studied in the lignocellulosic biomass-derived levulinic acid (LA) to γ-valerolactone (GVL). It was found that the presence of NiCu alloy rich of nickel on the 3D printed catalysts favors their catalytic performance in the studied reaction. The preservation of the zeolite structure was detected for all 3D printed samples, which has a positive influence on the metal dispersion registered in the 3D spent catalysts. The 3D printed 10Ni5Cu/NaCaX catalyst showed the highest LA conversion and high GVL yield at 200 °C reaction temperature but more stable catalytic performance was registered for the 10Ni5Cu/NaX catalyst in 4 reaction cycles. The preservation of zeolite structure and metal dispersion in 3D printed 10Ni5Cu/NaX catalyst resulted in stable catalytic activity in the studied reaction indicating its potential for practical application.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"459 ","pages":"Article 115441"},"PeriodicalIF":5.2,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Photoelectrochemical and photocatalytic activity of photodeposition-functionalized Ag/TiO2 and MnOx/TiO2 thin films 光沉积功能化Ag/TiO2和MnOx/TiO2薄膜的光电化学和光催化活性
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-07-02 DOI: 10.1016/j.cattod.2025.115447
Bozhidar I. Stefanov
{"title":"Photoelectrochemical and photocatalytic activity of photodeposition-functionalized Ag/TiO2 and MnOx/TiO2 thin films","authors":"Bozhidar I. Stefanov","doi":"10.1016/j.cattod.2025.115447","DOIUrl":"10.1016/j.cattod.2025.115447","url":null,"abstract":"<div><div>This study investigates the impact of UV-assisted photodeposition functionalization on the photoelectrochemical (PEC) and photocatalytic oxidation (PCO) performance of sol–gel derived TiO<sub>2</sub> thin films deposited onto ITO-coated glass substrates. Ag and MnO<sub>x</sub> species were photodeposited at varying UV irradiation doses (<span><math><msup><mrow><mi>D</mi></mrow><mi>UV</mi></msup></math></span>) in the 0 – 10 J cm<sup>−2</sup> range, and their effects on film properties were evaluated through photoelectrochemical (PEC) measurements, and Methylene blue photocatalytic oxidation (PCO) screening. Results revealed that both Ag and MnO<sub>x</sub> functionalization exhibit an optimal <span><math><msup><mrow><mi>D</mi></mrow><mi>UV</mi></msup></math></span> that maximizes PEC performance, with the Ag/TiO<sub>2</sub> photoanode at <span><math><msup><mrow><mi>D</mi></mrow><mi>UV</mi></msup></math></span> = 5 J cm<sup>−2</sup> achieving a ∼20 % increase in photocurrent density compared to pristine TiO<sub>2</sub>. Conversely, MnO<sub>x</sub> functionalization consistently inhibited PEC and PCO activity, particularly at higher <span><math><msup><mrow><mi>D</mi></mrow><mi>UV</mi></msup></math></span>. Mott–Schottky and EIS analyses confirmed improved charge separation and reduced charge-transfer resistance in optimally functionalized samples. Photodeposition-functionalized photoanodes outperformed dark-functionalized (0 J cm<sup>−2</sup>) ones, underscoring UV-assisted photodeposition as a flexible and effective surface modification strategy.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"459 ","pages":"Article 115447"},"PeriodicalIF":5.2,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Reduced graphene oxide facilitates charge transfer over a dibenzothiophene-S,S-dioxide-based linear conjugated polymer for efficient photosynthesis of hydrogen peroxide 还原氧化石墨烯促进电荷在二苯并噻吩- s, s -二氧化二氮基线性共轭聚合物上的转移,实现过氧化氢的高效光合作用
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-07-02 DOI: 10.1016/j.cattod.2025.115446
Jun Wu , Qi Li , Keke Zhang , Shuailing Wang , Xianjun Lang , Feng Wang
{"title":"Reduced graphene oxide facilitates charge transfer over a dibenzothiophene-S,S-dioxide-based linear conjugated polymer for efficient photosynthesis of hydrogen peroxide","authors":"Jun Wu ,&nbsp;Qi Li ,&nbsp;Keke Zhang ,&nbsp;Shuailing Wang ,&nbsp;Xianjun Lang ,&nbsp;Feng Wang","doi":"10.1016/j.cattod.2025.115446","DOIUrl":"10.1016/j.cattod.2025.115446","url":null,"abstract":"<div><div>Linear conjugated polymers have emerged as a versatile class of visible light photocatalysts, attracting increasing interest due to their tunable optoelectronic properties. However, their linear backbones often result in insufficient electron transfer, a limitation that can be mitigated by coupling them with a conductive π-conjugated system such as reduced graphene oxide (rGO). Here, we report the electrostatic self-assembly of a dibenzothiophene-<em>S</em>,<em>S</em>-dioxide-based conjugated polymer (PSOBN2) with rGO, forming a PSOBN2-rGO heterostructure. The two-dimensional conjugated structure of rGO facilitates π-electron transfers over PSOBN2 through interfacial coupling, thereby overcoming the inherent charge carrier transport limitation of linear conjugated polymers for enhanced charge separation and accelerated interfacial electron transfer. An optimized heterostructure, PSOBN2-rGO1, exhibits a better H<sub>2</sub>O<sub>2</sub> production rate of 9972 μmol h<sup>–1</sup> g<sup>–1</sup> in an air atmosphere under visible light irradiation, which is 1.42 times that of pristine PSOBN2. Notably, under natural sunlight irradiation, PSOBN2-rGO1 demonstrates an exceptional H<sub>2</sub>O<sub>2</sub> production rate of 9267 μmol h<sup>–1</sup> g<sup>–1</sup> within the initial hour. Mechanistic studies confirm the crucial role of rGO-facilitated electron transfer in promoting the reduction of O<sub>2</sub> and oxidation of H<sub>2</sub>O dual pathways for the photosynthesis of H<sub>2</sub>O<sub>2</sub>. This work offers a strategy for overcoming the inherent limitations of linear conjugated polymers toward efficient artificial photosynthesis of H<sub>2</sub>O<sub>2</sub>.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"459 ","pages":"Article 115446"},"PeriodicalIF":5.2,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Activity and selectivity for CO2 methanation of clusters and nanoplates of ruthenium dispersed on ceria: In-situ studies with XAFS and DRIFTS 分散在铈上的钌簇和纳米板的CO2甲烷化活性和选择性:XAFS和DRIFTS的原位研究
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-07-01 DOI: 10.1016/j.cattod.2025.115443
Irene Barba-Nieto , Marcos Fernández-García , Jorge Moncada , Guilherme Felipe Lenz , Juan D. Jimenez , Sooyeon Hwang , Akhil Tayal , Sanjaya D. Senanayake , Anna Kubacka , José A. Rodriguez
{"title":"Activity and selectivity for CO2 methanation of clusters and nanoplates of ruthenium dispersed on ceria: In-situ studies with XAFS and DRIFTS","authors":"Irene Barba-Nieto ,&nbsp;Marcos Fernández-García ,&nbsp;Jorge Moncada ,&nbsp;Guilherme Felipe Lenz ,&nbsp;Juan D. Jimenez ,&nbsp;Sooyeon Hwang ,&nbsp;Akhil Tayal ,&nbsp;Sanjaya D. Senanayake ,&nbsp;Anna Kubacka ,&nbsp;José A. Rodriguez","doi":"10.1016/j.cattod.2025.115443","DOIUrl":"10.1016/j.cattod.2025.115443","url":null,"abstract":"<div><div>The performance of Ru/CeO<sub>2</sub> catalysts under CO<sub>2</sub> hydrogenation conditions was studied using in situ X-ray absorption fine structure (XAFS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) to understand the structural evolution and chemical nature of each component under reaction conditions. The catalysts were prepared using a reverse microemulsion method that maximized the dispersion of RuO<sub>x</sub> particles on ceria. A RuO<sub>x</sub> → Ru transformation was observed upon exposure of the RuO<sub>x</sub>/CeO<sub>2</sub> systems to H<sub>2</sub> at 250 °C. For a sample with 5 % molar Ru, two-dimensional clusters (2–4 atoms) of Ru formed on top of the ceria support. An increase in the loading of ruthenium to 20 % molar led to the formation of nanoplates of the metal 2–3 at. layers thick. Both Ru structures were highly dispersed on ceria. They were oxidized after exposure to CO<sub>2</sub> at 250 °C. However, under CO<sub>2</sub>/H<sub>2</sub> mixture, they remained in a metallic state as two-dimensional clusters and nanoplates. In situ DRIFTS studies, the 5 % and 20 % Ru/CeO<sub>2</sub> catalysts showed distinct reaction intermediates when exposed to CO<sub>2</sub> or CO<sub>2</sub>/H<sub>2</sub> (1/4) reaction mixtures. Normalized to the Ru molar percentage, the 5 % Ru/CeO<sub>2</sub> system was the most active catalyst exhibiting a selectivity of ∼ 60 % CH<sub>4</sub> and 40 % CO at 250 °C. On the other hand, under the same reaction conditions, the 20 % Ru/CeO<sub>2</sub> system was less active but had a CH<sub>4</sub> selectivity close to 80 %. These results highlight the importance of the structure of the metallic Ru particles as a factor that determines the catalytic performance.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"459 ","pages":"Article 115443"},"PeriodicalIF":5.2,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Continuous photothermal gas-phase CO2 hydrogenation over highly dispersed Ru-Ni on TiO2 TiO2上高度分散的Ru-Ni的连续光热气相CO2加氢
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-06-26 DOI: 10.1016/j.cattod.2025.115440
Arturo Sanz-Marco , Jose L. Hueso , Víctor Sebastian , Francisco Balas , Jesus Santamaria
{"title":"Continuous photothermal gas-phase CO2 hydrogenation over highly dispersed Ru-Ni on TiO2","authors":"Arturo Sanz-Marco ,&nbsp;Jose L. Hueso ,&nbsp;Víctor Sebastian ,&nbsp;Francisco Balas ,&nbsp;Jesus Santamaria","doi":"10.1016/j.cattod.2025.115440","DOIUrl":"10.1016/j.cattod.2025.115440","url":null,"abstract":"<div><div>Photocatalytic and photothermal carbon dioxide (CO<sub>2</sub>) hydrogenation are investigated as key strategies for CO<sub>2</sub> depletion by transformation into valuable products. Ni and Ru are well known Sabatier's reaction catalysts. In the present work we study their activity as Ni, Ru and bimetallic nanoparticles over the surface of titanium dioxide (TiO<sub>2</sub>) in the photocatalytic reduction of CO<sub>2</sub>, following a process of photo-assisted deposition that yield highly dispersed nanoparticles with sizes under 2 nm. Outstanding production of solar fuels was observed from Ni and Ru 2-nm nanoparticles deposited onto P25 TiO<sub>2</sub>. The photocatalytic activity tests under light irradiation from low-energy LEDs at different wavelengths, from UV-A at 365 nm to infrared at 940 nm at 523 K, rendered up to 6 % CO<sub>2</sub> conversion under continuous feed, with CO and CH<sub>4</sub> productivities above 5 mmol/g<sub>cat</sub>·h.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"459 ","pages":"Article 115440"},"PeriodicalIF":5.2,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
C-C coupling of 1-butanol over Mg- and Li-doped L-zeolite 1-丁醇在Mg和li掺杂l型沸石上的C-C偶联
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-06-26 DOI: 10.1016/j.cattod.2025.115436
R. Palcheva , L. Kaluza , P. Shestakova , J. Moravcik , A. Lyutskanova , K. Soukup , Y. Kalvachev , G. Tyuliev , K. Jiratova
{"title":"C-C coupling of 1-butanol over Mg- and Li-doped L-zeolite","authors":"R. Palcheva ,&nbsp;L. Kaluza ,&nbsp;P. Shestakova ,&nbsp;J. Moravcik ,&nbsp;A. Lyutskanova ,&nbsp;K. Soukup ,&nbsp;Y. Kalvachev ,&nbsp;G. Tyuliev ,&nbsp;K. Jiratova","doi":"10.1016/j.cattod.2025.115436","DOIUrl":"10.1016/j.cattod.2025.115436","url":null,"abstract":"<div><div>In chemical technologies, the formation of carbon-carbon bonds has gained an increasing importance in recent years. In this work, we studied L-zeolite as a catalyst support for the gas-phase Guerbet coupling of 1-butanol at atmospheric pressure and 400 °C. Low-loaded monometallic (Mg and Li) catalysts were synthesized by incipient wetness impregnation and their physicochemical properties were characterized by N<sub>2</sub> and Ar adsorption-desorption isotherms, XRD, FT-IR, temperature-programmed desorption of NH<sub>3</sub> and CO<sub>2</sub>, <sup>29</sup>Si and <sup>27</sup>Al MAS NMR, and XPS. XRD and FTIR results showed no major change in the crystal structure of the doped zeolite. Impregnation of the zeolite by Mg and Li decreased the surface area and significantly reduced the micropore volume, but crystallinity was preserved. <sup>29</sup>Si MAS NMR indicated that desilication had occurred to some extent during catalyst impregnation, which led to the formation of mesopores. The Li/L catalyst showed more basic sites of intermediate strength due to surface Li-O pairs on the surface, which, together with mesoporosity, contribute to enhancing 1-butanol conversion by C-C coupling. The Li/L catalyst was more selective to C<sub>8</sub> oxygenate products than the reference aldol condensation catalyst.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"459 ","pages":"Article 115436"},"PeriodicalIF":5.2,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144501968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Application of clinoptilolite as carrier for VOCs removal by cobalt and manganese oxides 斜沸石载体在钴、锰氧化物去除VOCs中的应用
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-06-25 DOI: 10.1016/j.cattod.2025.115437
I. Yordanova , S. Todorova , K. Tenchev , E. Encheva , H. Kolev , A. Naydenov
{"title":"Application of clinoptilolite as carrier for VOCs removal by cobalt and manganese oxides","authors":"I. Yordanova ,&nbsp;S. Todorova ,&nbsp;K. Tenchev ,&nbsp;E. Encheva ,&nbsp;H. Kolev ,&nbsp;A. Naydenov","doi":"10.1016/j.cattod.2025.115437","DOIUrl":"10.1016/j.cattod.2025.115437","url":null,"abstract":"<div><div>Bulgarian natural zeolite Clinoptilolite was used for catalyst carrier. To improve carrier properties modification by nitric acid and ion exchange through ammonium nitrate was performed. Catalytic active phase of cobalt and manganese was applied by wet impregnation method. Synthesised Co or Mn catalysts were characterized by means of AES-ICP, XRD, low-temperature N<sub>2</sub> adsorption, TPR, XPS, and HRTEM. The zeolite catalysts were tested in the reaction of total oxidation of n-hexane. All samples demonstrated good catalytic activity. Samples with low amount of the active phase (10 %) manifested a higher catalytic activity. This is due to uniform distribution of the active phase on the carrier surface, diminished crystallite size, and readily reducible Co oxide and Mn oxide phases.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"459 ","pages":"Article 115437"},"PeriodicalIF":5.2,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144501969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Synergistic charge transfer engineering in Mo368POM@Nb2CTx@MoS2 heterostructure for accelerated visible light-driven hydrogen evolution Mo368POM@Nb2CTx@MoS2异质结构中加速可见光析氢的协同电荷转移工程
IF 5.2 2区 化学
Catalysis Today Pub Date : 2025-06-25 DOI: 10.1016/j.cattod.2025.115438
Khalid Umer , Khuram Hasnain , Bonan Li , Hira Shahid , Xiao Fang , Xi Zhang , Baochun Ma , Yong Ding
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