Article
Chemistry, Applied
Uriel Caudillo-Flores, Sergio Fuentes-Moyado, Marcos Fernandez-Garcia, Anna Kubacka
Summary: A series of catalysts with increasing amounts of Niobium were prepared using Pd as a co-catalyst and a high surface area titania support. The samples exhibited a consistent Pd particle size of approximately 4.6 nm, and Niobium was found to be present in the pores of anatase without affecting the primary particle size of the main oxide. The activity of the samples in hydrogen production under UV and visible illumination was tested and measured, showing that the optimal catalyst contained 1 mol. % of Niobium and demonstrated a quantum efficiency value of 2.8%.
Article
Materials Science, Multidisciplinary
Xinze Li, Qiong Liu, Jiliang Ma, Kangning Liu, Zhendong Liu, Runcang Sun
Summary: The RuP2/Ti4P6O23@TiO2-7 photocatalyst was successfully constructed for efficient photocatalytic hydrogen evolution and high selectivity biomass conversion. It exhibited a fast photo-generated carrier rate and wide visible light absorption range due to the in situ incorporated RuP2 and Ti4P6O23. The hydrogen evolution achieved 16.3 mmol g(-1) h(-1) accompanied by lactic acid production.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Energy & Fuels
Ling-Wei Wei, Kuen-Song Lin, H. Paul Wang
Summary: This study demonstrates the effective conversion of H2O(l)-to-H2O2(aq) and -H-2(g) using the novel Pd-TiO2-delta/TiO2 photocatalysts through photocatalytic reactions. The results show that this photocatalyst can efficiently generate green energy under solar energy.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Jianjun Chen, Sikai Wang, Laurent Peres, Vincent Colliere, Karine Philippot, Pierre Lecante, Yaoqiang Chen, Ning Yan
Summary: The study reports efficient catalysis of direct oxidation of methane to methanol using Pd@Pt core-shell nanoparticles in water, showing high productivity and selectivity. Electron-enriched Pt species were identified in the nanoparticles, with Pd donating electrons to Pt for enhanced methane activation, proposing a consecutive oxidation pathway through a radical mechanism.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Cheng-An Hu, Jian-Peng Qin, Chun-Yang Pan
Summary: In this study, three hybrid bismuth-based halide perovskites were successfully synthesized and demonstrated to possess excellent photocatalytic performance and cycling stability. Additionally, the photocatalytic degradation performance of four previously reported bismuth-based halide perovskites was also characterized and summarized.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Multidisciplinary
Chi Ma, Quan Cheng, Ze-Xin Huang, Fu-Guang Zhang, Qing-Yu Liu, Yong-Jun Yuan
Summary: TiO2 nanoparticles grown on MoS2/N-doped graphitic carbon have been shown to be efficient noble-metal-free photocatalysts for H-2 production from lignocellulosic biomass. The H-2 generation rate from wheat straw, corncob, polar wood chip, bamboo, rice hull, corn straw, and rice straw aqueous solution respectively reaches 4.9, 6.7, 11.7, 14.5, 8.4, 7.3, and 6.2 mu mol g(-1) h(-1).
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
M. R. Kosinski, A. J. Vizcaino, L. M. Gomez-Sainero, A. Carrero, R. T. Baker
Summary: Catalysts of 2 wt% Pd/Sm-doped Ceria were prepared and evaluated for hydrogen production by methanol reforming. Among the three preparation methods, Method B resulted in the best activity and CO2 selectivity due to the superior nanostructure of the catalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Huiqin Wang, Haopeng Jiang, Pengwei Huo, Miroslava Filip Edelmannova, Libor Capek, Kamila Koci
Summary: Efficient NiO nanoparticles/TiO2 nanorods p-n heterojunction structure photocatalyst was constructed through reasonable design, showing enhanced photoactivity and hydrogen production. The detailed characterization of the photocatalyst's photoelectrochemical properties was conducted, followed by discussion of the photocatalytic reduction mechanism.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Xiaojiao Cai, Siyuan Fang, Yun Hang Hu
Summary: This study presents a method for direct conversion of methane to methanol using Au-Pd/TiO2 as catalyst, achieving high methanol yield under light irradiation. The high efficiency is attributed to factors such as affinity between nanoparticles and intermediates, photothermal effect, mild oxidant O-2, and effective dissolution of methanol in water. Additionally, thermo-photo catalysis is demonstrated for the first time by utilizing different light sources for distinct roles in catalyzing the redox reactions.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Review
Chemistry, Physical
Yuhao Liu, Xinlong Zheng, Yingjie Yang, Jing Li, Weifeng Liu, Yijun Shen, Xinlong Tian
Summary: This review article summarizes the development and application of TMS/TiO2 heterojunction photocatalysts, including their characteristics, properties, and advantages, and discusses the factors influencing photocatalytic hydrogen evolution process.
Article
Chemistry, Physical
Yufen Chen, Lluis Soler, Marina Armengol-Profitos, Chenyang Xie, Daniel Crespo, Jordi Llorca
Summary: In this study, a photocatalyst with highly dispersed Pd clusters onto TiO2 was successfully synthesized through one-step ball milling. The unique interaction between the Pd clusters and titania support was observed only in the ball-milled sample and disappeared after calcination treatment. This mechanochemical strategy provides a new pathway for stabilizing supported metal clusters on semiconductors.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
Li Li, Xinhong Chen, Xuejun Quan, Facheng Qiu, Xingran Zhang
Summary: CuOx/TiO2 co-photocatalysts with various Cu loading contents were synthesized. The CuOx/TiO2 composites exhibited a unique structure with uniformly distributed CuOx clusters on the TiO2 cube. The photocatalytic activity was greatly enhanced by the reversible process of Cu species and the synergistic effect between CuOx and TiO2.
Article
Chemistry, Physical
S. Y. Toledo-Camacho, A. Rey, M. I. Maldonado, J. Llorca, S. Contreras, F. Medina
Summary: This paper focuses on the photocatalytic hydrogen production on Pd/TiO2(-WO3) catalysts from water-methanol and water-glycerol mixtures. The method of Pd photodeposition plays a key role in increasing hydrogen evolution. Experimental results from lab scale and pilot-scale solar CPC show the competitiveness of these catalysts in terms of hydrogen production efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Wei Qiao, Xudong Yang, Meng Li, Ligang Feng
Summary: In this study, hollow Pd/Te nanorods were fabricated and evaluated for methanol oxidation, showing high catalytic efficiency in alkaline electrolyte compared to commercial Pd/C catalysts. The Pd/Te hybrid structure exhibited strong electronic effects and facile oxophilic properties, leading to its high catalytic performance for methanol oxidation. Additionally, the Pd/Te catalyst demonstrated high catalytic stability, strong anti-CO poisoning ability, and faster catalytic kinetics, which can be attributed to the electron-rich state of Pd and high active site exposure.
Article
Chemistry, Physical
Aykut Caglar, Ayse Gozde Sayin, Nahit Aktas, Hilal Kivrak
Summary: In this study, titanium dioxide-supported CdTe photocatalysts were prepared using the wet impregnation method and characterized for their structural and morphological properties. The photocatalytic activity of the CdTe(70-30)/TiO2 photocatalyst was found to be the best under UV illumination, showing good stability and resistance.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Correction
Chemistry, Physical
Thomas Richards, Richard J. Lewis, David J. Morgan, Graham J. Hutchings
Article
Chemistry, Physical
Thomas Richards, Richard J. Lewis, David J. Morgan, Graham J. Hutchings
Summary: The direct synthesis of H2O2 from molecular H-2 and O-2 using Pd-based catalysts has been investigated. The ratio of Pd to Au in the catalyst as well as the catalyst support were found to play important roles in controlling catalytic activity and performance. Alloying Pd with more abundant secondary metals is a potential alternative to replace expensive Au.
Article
Chemistry, Physical
Syaahidah Abdul Razak, Abdul Hanif Mahadi, Roshan Thotagamuge, Didik Prasetyoko, Hasliza Bahruji
Summary: Hydrogen gas production from carbon-free molecules utilizing solar energy is a pathway for zero carbon emission energy. TiO2 photocatalysts have been evaluated for generating carbon-free hydrogen from NH3 solution, and alkylamines molecules show higher reactivity for hydrogen production than NH3.
Article
Chemistry, Physical
David J. Morgan, Sharukaa Uthayasekaran
Summary: The study compared the degradation of halogenated and non-halogenated polymers using x-ray photoelectron spectroscopy with different types of spectrometers. The results showed notable differences from the degradation index proposed by Beamson and Briggs. The effects of neutralizer and spot size on degradation kinetics were explored, leading to practical recommendations for analyzing damage-susceptible polymers.
SURFACE AND INTERFACE ANALYSIS
(2023)
Article
Chemistry, Physical
Tao Tong, Mark Douthwaite, Lu Chen, Rebecca Engel, Matthew B. Conway, Wanjun Guo, Xin-Ping Wu, Xue-Qing Gong, Yanqin Wang, David J. Morgan, Thomas Davies, Christopher J. Kiely, Liwei Chen, Xi Liu, Graham J. Hutchings
Summary: The physicochemical properties of Pt/CeO2 catalysts were varied to investigate their impact on the hydrogen-borrowing amination of alcohols. It was found that the Pt precursor and CeO2 support properties strongly influenced catalytic performance. The most active catalyst exhibited linearly structured Pt species, which were more effective for the rate-determining step of cyclopentanol dehydrogenation compared to Pt clusters and nanoparticles. This study not only provides insights into desirable catalytic properties for hydrogen-borrowing amination but also has broader relevance to related fields.
Article
Chemistry, Physical
Isaac T. T. Daniel, Liang Zhao, Donald Bethell, Mark Douthwaite, Samuel Pattisson, Richard J. J. Lewis, Ouardia Akdim, David J. J. Morgan, Steven McIntosh, Graham J. J. Hutchings
Summary: Recent studies have shown that the rate of catalytic alcohol and formyl dehydrogenation in bimetallic Au-Pd systems is closely related to the rate of oxygen reduction. In this study, the rate enhancement resulting from the coupling of these two processes is evaluated for the oxidative dehydrogenation of 5-hydroxymethylfurfural. By changing the molar ratio of Au and Pd in a physical mixture of carbon-supported catalysts, the influence of the ratio on the activity is explored. It is found that the activity of the bimetallic system exceeds the combined activity of the monometallic analogues. The kinetic analysis of the system predicts the locations of the maxima in activity for both monometallic and bimetallic systems. The accuracy of the model provides further evidence and understanding of cooperative redox enhancement effects observed in bimetallic, heterogeneous catalytic systems.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Asranudin, Holilah, Adi Setyo Purnomo, Hasliza Bahruji, Dalia Allouss, Ilias El Alaoui-Elbalrhiti, Riki Subagyo, Alya Awinatul Rohmah, Didik Prasetyoko
Summary: Reusable adsorbent beads were developed by encapsulating hectorite-modified CTAB with Ca-alginate for wastewater treatment. The resulting BHec-40 showed excellent thermal stability compared to Hec-40, although its mesoporous surface area decreased. The hectorite-CTAB-alginate beads demonstrated high adsorption capacity and stability for MO adsorption.
Article
Chemistry, Physical
Xiang-Bing Fan, Dong-Wook Shin, Sanghyo Lee, Junzhi Ye, Shan Yu, David J. Morgan, Adrees Arbab, Jiajie Yang, Jeong-Wan Jo, Yoonwoo Kim, Sung-Min Jung, Philip R. Davies, Akshay Rao, Bo Hou, Jong Min Kim
Summary: InP quantum dots (QDs) are being studied as a less toxic alternative to Cd-based QDs. Aminophosphine and H2S are used to eliminate defects and reconstruct the interface between InP and ZnS, resulting in enhanced photoluminescence (PL). H2S etching can also control the size of the InP core, allowing for the production of wide band gap InP-based QDs with blue emission.
NANOSCALE HORIZONS
(2023)
Article
Chemistry, Physical
Rachel L. McLaren, Rosenildo C. da Costa, Anna C. Booth, David J. Morgan, Christian J. Laycock, Michael E. A. Warwick, Gareth R. Owen
Summary: The preparation of oleophobic materials coated with a composite based on a multi-layer graphitic scaffolding is reported. These materials demonstrate efficient oil/water separations and reusability, making them promising candidates for applications such as aircraft propellant tanks and oil-spill removal.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Chemistry, Physical
Vincent Fernandez, David Morgan, Pascal Bargiela, Neal Fairley, Jonas Baltrusaitis
Summary: Cellulose undergoes new chemistry in response to XPS, but recent studies have shown that this can be detrimental to some materials. This study analyzes cellulose spectra obtained during a degradation study, revealing that cellulose degrades through the creation of carbon chemistry involving C-O, C--O and O-C--O. The findings are relevant to any material analyzed by XPS dependent on hydrogen bonds. The analysis techniques are based on an informed vectorial approach, utilizing mathematical methods such as Principal Component Analysis and linear analysis.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Xin Li, Peng Rui, Wenfei Huang, Xin Yao, Yuewen Ye, Tongqi Ye, David J. Morgan, James H. Carter
Summary: The dehydrogenation of propane was studied using Pt supported on Ga-doped silica with different pore structures. The addition of a small amount of Ga to the support greatly improved the catalyst's conversion and selectivity. Optimizing the Pt and Ga content showed that low loadings of both active components are necessary for efficiency enhancement. The results suggest that doping Ga into SiO2 as a support for Pt nanoparticles is a viable strategy for producing highly efficient catalysts for propane dehydrogenation.
Article
Energy & Fuels
Faten Saman, Hasliza Bahruji, Abdul Hanif Mahadi, Celine Hee Se Ling
Summary: The reduction treatment affects the photocatalytic activity of g-C3N4 and Pd/g-C3N4 due to changes in their structural and optical properties. Reduced Pd/g-C3N4 exhibits improved H2 production rate, while g-C3N4 experiences a decline in photocatalytic activity after reduction. The hydrogen production rate follows the order of Pd/g-C3N4/450 degrees C > Pd/g-C3N4/250 degrees C > Pd/g-C3N4 > g-C3N4 > g-C3N4/250 degrees C > g-C3N4/450 degrees C. The presence of Pd reduces electron recombination and enhances charge mobility through Pd-N bond formation, while the formation of terminal -NH2 groups in g-C3N4 hinders electron conductivity due to increased hydrogen bonding. The role of the hydroxyl group on triethanolamine (TEOA) in scavenging photogenerated holes was demonstrated in in-situ photocatalytic hydrogen production.
Article
Chemistry, Multidisciplinary
Dina Kartika Maharani, Yuly Kusumawati, Widiya Nur Safitri, Reva Edra Nugraha, Holilah Holilah, Novia Amalia Sholeha, Aishah Abdul Jalil, Hasliza Bahruji, Didik Prasetyoko
Summary: Optimizing the hierarchical ZSM-5 structure by varying the first hydrothermal step at different times provides insight into the evolution of micro/mesopores and their effect as a catalyst for deoxygenation reaction. Monitoring the incorporation of tetrapropylammonium hydroxide (TPAOH) and N-cetyl-N,N,N-trimethylammonium bromide (CTAB) helps understand their role in pore formation. The optimized hierarchical ZSM-5, achieved through hydrothermal condensation at 3 hours, exhibits high acidity and micro/mesoporous synergy, resulting in 71.6% diesel hydrocarbon selectivity due to improved diffusion within the hierarchical structures.
Article
Chemistry, Physical
Liang Zhao, Ouardia Akdim, Xiaoyang Huang, Kai Wang, Mark Douthwaite, Samuel Pattisson, Richard J. Lewis, Runjia Lin, Bingqing Yao, David J. Morgan, Greg Shaw, Qian He, Donald Bethell, Steven McIntosh, Christopher J. Kiely, Graham J. Hutchings
Summary: The aerobic oxidation of alcohols and aldehydes over supported heterogeneous catalysts involves two interconnected processes: dehydrogenation and oxygen reduction. The rate of the reaction can be greatly enhanced by coupling these processes through electron transport between independent active sites. The ratio of Au/Pd catalysts used and their physical properties play important roles in promoting alcohol oxidation through cooperative redox enhancement (CORE).
Article
Chemistry, Multidisciplinary
Eka Putra Ramdhani, Eko Santoso, Holilah Holilah, Reva Edra Nugraha, Hasliza Bahruji, Suprapto Suprapto, Aishah Abdul Jalil, Nurul Asikin-Mijan, Syafsir Akhlus, Didik Prasetyoko
Summary: Conversion of red mud into mesoporous Fe-aluminosilicate can produce selective catalysts for deoxygenation of waste cooking oil. The addition of citric acid during the conversion process changes the structure of the catalyst. Untreated red mud has a well-defined hexagonal mesoporosity, while treated red mud has lower regularity mesopores.
