Catalysis Science & Technology最新文献_第2页

Adsorption or photocatalysis? Engineering BiOI with metalorganic framework CAU-17 and microporous organic polymer MOP-CH2EDA to enhance ciprofloxacin removal from water 吸附还是光催化？利用金属有机骨架cac -17和微孔有机聚合物mopp - ch2eda来提高水中环丙沙星的去除效果

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-05-14 DOI: 10.1039/d6cy00135a

Sepideh G. Khasevani, Saulius Kaciulis, Alessio Mezzi, Shokat Sarmad, Jyri-Pekka Mikkola, Dariush Nikjoo, Isabella Concina

{"title":"Adsorption or photocatalysis? Engineering BiOI with metalorganic framework CAU-17 and microporous organic polymer MOP-CH2EDA to enhance ciprofloxacin removal from water","authors":"Sepideh G. Khasevani, Saulius Kaciulis, Alessio Mezzi, Shokat Sarmad, Jyri-Pekka Mikkola, Dariush Nikjoo, Isabella Concina","doi":"10.1039/d6cy00135a","DOIUrl":"10.1039/d6cy00135a","url":null,"abstract":"<div><div>This work reports the design of binary and ternary BiOI-based composites incorporating the metal–organic framework CAU-17 and the amine-functionalized microporous organic polymer MOP-CH2EDA for the removal of ciprofloxacin (CIP) from water. The materials were synthesized via an in situ solvothermal approach and systematically characterized to establish structure–property relationships. The results reveal that adsorption and photocatalysis act as coupled and sequential processes, rather than independent pathways, with the polymer component enhancing CIP pre-concentration and the BiOI/MOF interface governing photodegradation. The ternary composite BCM-10% exhibited the best performance, achieving up to 80% CIP removal under simulated solar irradiation. Scavenger experiments indicate that ·O2− is the dominant reactive species, while photogenerated holes also contribute significantly. The degradation process is strongly influenced by pH, reflecting the interplay between catalyst surface properties, reactive oxygen species generation, and CIP speciation. HPLC-MS analysis confirms the formation of multiple intermediates and highlights the complexity of the degradation pathways. Despite the improved performance of the ternary composites, the overall activity remains moderate compared to state-of-the-art photocatalysts, underscoring the limitations of current BiOI-based systems. The results emphasize that apparent kinetic behavior is strongly affected by adsorption contributions, complicating direct comparison with literature data. This study provides new insight into the design of multifunctional materials for water treatment, highlighting the importance of adsorption–photocatalysis synergy and the need for more rigorous and standardized evaluation of photocatalytic systems.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"16 12","pages":"Pages 4028-4044"},"PeriodicalIF":4.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148285328","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}

引用次数: 0

Ru/CeO2 catalysts for supercritical water gasification of glycerol: stability, activity, and coke hydrothermal oxidation Ru/CeO2超临界水气化甘油催化剂：稳定性、活性及焦炭水热氧化

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-05-29 DOI: 10.1039/d5cy01486g

Tomasz Kondratowicz, Aurélien Quenet, Xujun Li, Andrea Testino, Oliver Kröcher, Frédéric Vogel, David Baudouin

{"title":"Ru/CeO2 catalysts for supercritical water gasification of glycerol: stability, activity, and coke hydrothermal oxidation","authors":"Tomasz Kondratowicz, Aurélien Quenet, Xujun Li, Andrea Testino, Oliver Kröcher, Frédéric Vogel, David Baudouin","doi":"10.1039/d5cy01486g","DOIUrl":"10.1039/d5cy01486g","url":null,"abstract":"<div><div>Cerium oxide (CeO2) was investigated as a support for Ru nanoparticles in the continuous supercritical water gasification (SCWG) of glycerol as a model biomass compound. The stability of pure CeO2 under reductive SCW conditions was first assessed in both batch and continuous modes. In batch, CeO2 readily underwent phase transformation to CeCO3OH, implying reduction of Ce4+ to Ce3+, leading to severe loss of surface area. The formation of CeCO3OH was completely prevented in continuous flow due to the flushing of CO2 and reductive compounds before cooling down to a temperature thermodynamically favouring CeCO3OH. Although pristine CeO2 showed low activity in SCWG, thermal treatment strongly influenced product distribution, with CO disappearing in favour of C3H8 after a reductive pretreatment. When Ru nanoparticles were supported on thermally stabilized CeO2 (calcined at 700–900 °C, 0.11–1.00 wt% Ru), the catalysts displayed high efficiency in SCWG of glycerol, yielding CO2, CH4, and H2 as the main products. These Ru/CeO2 catalysts achieved apparent conversion rates up to three times higher than a commercial 5 wt% Ru/AC benchmark, while maintaining similar selectivity trends. Both Ru/CeO2 and carbon-based catalysts exhibited similar decreasing activity trends under operation. Post-reaction analysis revealed some carbon deposition on Ru/CeO2, likely the main cause of the observed loss of activity, which could be effectively removed either by thermal oxidation in air at 300 °C or by in situ hydrothermal oxidation with H2O2 at 110 °C. Overall, Ru/CeO2 emerges as a durable and regenerable alternative to Ru/carbon for SCWG applications.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"16 12","pages":"Pages 4200-4212"},"PeriodicalIF":4.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148285348","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}

引用次数: 0

Tailored synthesis of hollow tubular In2O3/In2S3 Z-scheme heterojunctions for highly selective CO production in CO2 hydrogenation 在CO2加氢过程中高选择性产CO的中空管状In2O3/In2S3 z -方案异质结的定制合成

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-05-19 DOI: 10.1039/d6cy00306k

Fenghao Xing, Qiutong Han, Lei Wang, Buyun Shi, Chuqiu Wang, Yichang Pan

{"title":"Tailored synthesis of hollow tubular In2O3/In2S3 Z-scheme heterojunctions for highly selective CO production in CO2 hydrogenation","authors":"Fenghao Xing, Qiutong Han, Lei Wang, Buyun Shi, Chuqiu Wang, Yichang Pan","doi":"10.1039/d6cy00306k","DOIUrl":"10.1039/d6cy00306k","url":null,"abstract":"<div><div>Efficient CO2 hydrogenation to value-added CO under mild conditions is critical for carbon neutrality. Herein, we report a hollow tubular In2O3/In2S3 Z-scheme heterojunction catalyst, synthesized via sulfidation of a MOF-derived In2O3 nanotube precursor. Under atmospheric pressure and low temperature (180 °C), the catalyst achieves highly selective CO production (96.35% selectivity) with a CO production rate of 122.80 μmol g−1 h−1 in photothermal catalytic CO2 reduction-exceeding those of pure In2O3 and bulk In2O3 by 5.85- and 27.91-fold, respectively. The hollow tubular architecture enhances mass transfer and exposes abundant active sites, while the In2O3/In2S3 interface enables efficient charge separation via a Z-scheme mechanism. The photothermal synergistic effect further accelerates reaction kinetics and lowers the reaction energy barrier, collectively improving both the yield and selectivity of the products.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"16 12","pages":"Pages 4114-4121"},"PeriodicalIF":4.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148285336","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}

引用次数: 0

Engineering and optimising barium cerate-supported cobalt catalyst for ammonia synthesis 工程和优化铈酸钡负载的合成氨钴催化剂

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-05-26 DOI: 10.1039/d5cy01610j

Hubert Ronduda, Małgorzata Lemańska, Urszula Ulkowska, Wojciech Patkowski, Weronika Bulejak, Andrzej Ostrowski, Jacek Sikorski, Kamil Sobczak, Milena Ojrzyńska, Dariusz Moszyński, Wioletta Raróg-Pilecka

{"title":"Engineering and optimising barium cerate-supported cobalt catalyst for ammonia synthesis","authors":"Hubert Ronduda, Małgorzata Lemańska, Urszula Ulkowska, Wojciech Patkowski, Weronika Bulejak, Andrzej Ostrowski, Jacek Sikorski, Kamil Sobczak, Milena Ojrzyńska, Dariusz Moszyński, Wioletta Raróg-Pilecka","doi":"10.1039/d5cy01610j","DOIUrl":"10.1039/d5cy01610j","url":null,"abstract":"<div><div>Ammonia synthesis under mild reaction conditions remains a key challenge to realising a carbon-free society. The development of efficient catalysts for ammonia synthesis is therefore of great interest nowadays. Here, the effects of the cobalt deposition method and loading on the physicochemical properties and catalytic performance of Sm-doped BaCeO3-supported Co catalysts were systematically investigated. Catalysts were prepared by deposition–precipitation, wet impregnation, and physical mixing methods. Depending on the method used, the catalyst properties varied in terms of chemisorptive properties and catalytic activity. The favourable activity observed for catalysts prepared by deposition–precipitation and wet impregnation methods was attributed to a more diverse surface landscape that facilitates hydrogen and nitrogen adsorption and activation. Then, by using the deposition–precipitation method, a series of catalysts with Co loadings from 10 to 50 wt% was synthesised. Catalytic testing revealed a clear dependence of activity on Co loading, with the highest reaction rate and intrinsic turnover frequency observed for the catalyst loaded with 40 wt% Co. This behaviour was explained not only by the greater number of adsorption sites but also by the structural sensitivity of cobalt in ammonia synthesis, where a diverse surface landscape with various adsorption sites improved the catalytic performance.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"16 12","pages":"Pages 4149-4166"},"PeriodicalIF":4.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148285302","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}

引用次数: 0

Trace palladium and copper as hidden catalysts in cross-coupling reactions: roles and analytical detection 痕量钯和铜作为交叉偶联反应的隐藏催化剂：作用和分析检测

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-05-13 DOI: 10.1039/d6cy00003g

Papita Behera, Santosh Kumar Sahu, Pradyota Kumar Behera, Laxmidhar Rout, Debendra Kumar Mohapatra

{"title":"Trace palladium and copper as hidden catalysts in cross-coupling reactions: roles and analytical detection","authors":"Papita Behera, Santosh Kumar Sahu, Pradyota Kumar Behera, Laxmidhar Rout, Debendra Kumar Mohapatra","doi":"10.1039/d6cy00003g","DOIUrl":"10.1039/d6cy00003g","url":null,"abstract":"<div><div>Palladium- and copper-catalyzed reactions are among the most widely employed methodologies in cross-coupling chemistry for the formation of key C–X (X = C, N, O, S) bonds, underpinning the synthesis of pharmaceuticals, agrochemicals, and complex natural products. Considerable efforts have been directed toward developing alternative catalytic systems based on inexpensive metals or organocatalysis; however, many such systems, including those reported as metal-free, are often not truly devoid of ultra-trace amounts of palladium and copper at ppm, ppb, or even ppt levels. This Review highlights systematic approaches for the detection and removal of hidden Pd/Cu impurities that can lead to misinterpretation of metal-free reactivity. It further examines how ultra-low loadings of these metals can still deliver high turnover numbers (TON), thereby influencing mechanistic understanding. This review article also provides a comprehensive framework for identifying trace Pd/Cu metal impurities and elucidating their unnoticed roles in cross-coupling chemistry.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"16 12","pages":"Pages 3990-4018"},"PeriodicalIF":4.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148285327","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}

引用次数: 0

Synthesis of ethanol via methanol homologation with CO2 and H2 using an industrially relevant Ru–Co catalyst 使用工业上相关的Ru-Co催化剂，通过甲醇与CO2和H2的同源性合成乙醇

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-05-18 DOI: 10.1039/d6cy00285d

Longbo Zhang, Jia Guo, Yanyan Wang, Ying Wang, Jie Li, Hongxing Wang, Chenglong Yu, Yanru Zhang, Jun He, Xianyu Meng, Zhuo Zhang, Tianbin Wu, Qingli Qian, Li Tan, Buxing Han

{"title":"Synthesis of ethanol via methanol homologation with CO2 and H2 using an industrially relevant Ru–Co catalyst","authors":"Longbo Zhang, Jia Guo, Yanyan Wang, Ying Wang, Jie Li, Hongxing Wang, Chenglong Yu, Yanru Zhang, Jun He, Xianyu Meng, Zhuo Zhang, Tianbin Wu, Qingli Qian, Li Tan, Buxing Han","doi":"10.1039/d6cy00285d","DOIUrl":"10.1039/d6cy00285d","url":null,"abstract":"<div><div>Homogeneously catalyzed ethanol synthesis from CO2 and H2 usually uses expensive, unstable and complex catalyst precursors, hindering their industrial viability. In this work, a homogeneous catalytic system consisting of economic and stable catalyst precursors (RuCl3·3H2O and CoCl2·6H2O), cocatalyst (LiI) and N-ethyl-2-pyrrolidone (NEP) solvent was designed to accelerate ethanol production via methanol homologation with CO2 and H2. After activation of the catalyst precursors at 200 °C with CO, the target reaction could proceed efficiently under mild conditions (170 °C), with top level reaction selectivity (64.9%) and much higher space time yield (STY) of ethanol (3.9 g L−1 h−1) compared to previous reports with Ru/Co catalysts. The impact of activation conditions, reaction conditions, and the catalytic mechanism of the reaction were studied by a series of control experiments. This method of ethanol production has the advantages of a stable and easily available catalyst, excellent performance, and easy separation and recycling of the catalyst, showing great potential for industrialization.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"16 12","pages":"Pages 4068-4077"},"PeriodicalIF":4.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148285331","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}

引用次数: 0

Dual Pd2+ and Pd0 sites on CeO2 for selective oxidative cleavage of C–C bonds in lignin β-O-4 ketones 木质素β-O-4酮的C-C键选择性氧化裂解在CeO2上的双Pd2+和Pd0位点

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-05-12 DOI: 10.1039/d6cy00428h

Yuzhen Hu, Ruiying Xiong, Xin Qu, Taras Nagornyy, Zhenlong Song, Xingye Zeng, Ning Li, Qi Zhang, Longlong Ma

{"title":"Dual Pd2+ and Pd0 sites on CeO2 for selective oxidative cleavage of C–C bonds in lignin β-O-4 ketones","authors":"Yuzhen Hu, Ruiying Xiong, Xin Qu, Taras Nagornyy, Zhenlong Song, Xingye Zeng, Ning Li, Qi Zhang, Longlong Ma","doi":"10.1039/d6cy00428h","DOIUrl":"10.1039/d6cy00428h","url":null,"abstract":"<div><div>Selective C–C bond cleavage in lignin is a pivotal step toward its efficient utilization, enabling the production of diverse and valuable chemicals from this abundant and renewable resource. Among the catalysts reported for the oxidative cleavage of C–C bonds in lignin β-O-4 ketones, CeO2-supported Pd catalysts have demonstrated outstanding activity. However, the exact nature of the active Pd sites responsible for the C–C bond cleavage remains poorly understood, limiting mechanistic insights into this transformation. In this study, CeO2 supports with four distinct morphologies including rods (R), spheres (S), cubes (C), and polyhedrons (P) were synthesized to investigate their influence on the catalytic activity of Pd/CeO2 catalysts in the oxidative cleavage of β-O-4 ketones. The catalytic performance was found to depend strongly on the morphology of CeO2, with Pd/CeO2-P exhibiting the highest activity for the C–C bond cleavage. This catalyst possessed the lowest Pd4+ content and the highest Pd0/Pd2+ ratio among the series. By systematically tuning this ratio, a volcano-type relationship between the Pd0/Pd2+ ratio and catalytic activity was established, indicating a dual-site mechanism in which Pd0 facilitates the formation of reactive oxygen species, while Pd2+ serves as the active center for the C–C bond cleavage.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"16 12","pages":"Pages 4190-4199"},"PeriodicalIF":4.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148285347","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}

引用次数: 0

Ambient pressure ammonia decomposition using Ga–Co supported catalytically active liquid metal solutions 使用Ga-Co负载的催化活性液态金属溶液进行常压氨分解。

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-06-06 DOI: 10.1039/d6cy00362a

Philipp Rothgängel, Nicola Taccardi, Aaron Luke Folkard, Jakob Söllner, Alexander Søgaard, Andreas Körner, Andreas Hutzler, Matthias Thommes, Marco Haumann, Peter Wasserscheid

{"title":"Ambient pressure ammonia decomposition using Ga–Co supported catalytically active liquid metal solutions","authors":"Philipp Rothgängel, Nicola Taccardi, Aaron Luke Folkard, Jakob Söllner, Alexander Søgaard, Andreas Körner, Andreas Hutzler, Matthias Thommes, Marco Haumann, Peter Wasserscheid","doi":"10.1039/d6cy00362a","DOIUrl":"10.1039/d6cy00362a","url":null,"abstract":"<div><div>Ga–Co supported catalytically active metal solutions (SCALMS) on silicon carbide (SiC) were successfully tested for ambient pressure ammonia decomposition in the temperature range between 480 and 580 °C. Comparison studies of a Ga59Co SCALMS system with their monometallic equivalents Co/SiC and Ga/SiC revealed a massively enhanced ammonia decomposition activity of the supported alloy catalyst. The Ga59Co/SiC outperformed a monometallic benchmark Co/SiC catalyst in terms of the Co specific H2 productivity by up to one order of magnitude. Monometallic Ga/SiC, in contrast, showed no activity for ammonia decomposition up to 580 °C. We report productivities of 487 gH2 gCo−1 h−1 at 5% conversion and 550 °C at a weight hourly space velocity (WHSV) of 29 000 mLN gcat−1 h−1 for our SCALMS system. Apparent activation energies (EA,app) determined from temperature variation experiments give no indication for diffusion limitations under the applied reaction conditions. Therefore, we present a new catalyst material concept for ammonia decomposition with high potential for practical and technical application.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"16 12","pages":"Pages 4019-4027"},"PeriodicalIF":4.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148222332","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}

引用次数: 0

On the reactions of (hetero)aryl and vinyl triflates with [Ni(COD)(dppf)] （杂）芳基和三氟乙烯酯与[Ni(COD)(dppf)]的反应

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-05-19 DOI: 10.1039/d6cy00261g

Nicholas C. C. McVeigh, Megan E. Greaves, Rachel H. Munday, Thomas O. Ronson, Scott Rice, Stephen Sproules, David J. Nelson

引用次数: 0

Steering C–C bond cleavage and hydrogenation in polystyrene hydrocracking through external Brønsted acid sites over Ni/zeolites 在Ni/沸石上通过外部Brønsted酸位控制聚苯乙烯加氢裂化过程中C-C键的解理和加氢

IF 4 3区化学

Catalysis Science & Technology Pub Date : 2026-06-22 Epub Date: 2026-04-13 DOI: 10.1039/d6cy00204h

Jonghyun Park, Taeeun Kwon, Ki Hyuk Kang, Wangyun Won, Insoo Ro

{"title":"Steering C–C bond cleavage and hydrogenation in polystyrene hydrocracking through external Brønsted acid sites over Ni/zeolites","authors":"Jonghyun Park, Taeeun Kwon, Ki Hyuk Kang, Wangyun Won, Insoo Ro","doi":"10.1039/d6cy00204h","DOIUrl":"10.1039/d6cy00204h","url":null,"abstract":"<div><div>Unlike polyolefin hydrocracking, aromatic substituents in polystyrene (PS) stabilize benzylic species and redirect degradation pathways, making selective catalytic upcycling more difficult. Consistent with this challenge, recycling rates for polyolefins reach only 5.3–10.3%, whereas PS remains below 1%. Here, PS hydrocracking over bifunctional Ni/zeolite catalysts was examined to determine how hydrogen utilization and C–C bond cleavage depend on Brønsted acid sites (BASs) and the accessibility of active sites to polymer-derived intermediates. Non-acidic Ni catalysts mainly consumed hydrogen via aromatic-ring hydrogenation with minimal PS conversion, whereas incorporating BASs enabled depolymerization under mild conditions (300 °C). Across HY zeolites and additional frameworks with similar SiO2/Al2O3 ratios, conversion exhibited non-monotonic behavior: excessive acidity and/or restricted polymer accessibility reduced activity, yielding volcano-like trends and framework-dependent deviations. Poisoning tests indicated that external BASs are required to initiate backbone cleavage. Product distributions further reflected the interplay between acid-site accessibility and hydrogenation capacity, and hydrogen consumption correlated linearly with PS conversion within the Ni/zeolite series. Overall, these results highlight externally accessible Brønsted acidity as a practical handle for tuning Ni/zeolite catalysts toward LOHC-relevant products.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"16 12","pages":"Pages 4057-4067"},"PeriodicalIF":4.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148285330","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}

引用次数: 0