Article
Chemistry, Physical
Niels C. Schjodt, Susanne L. Jorgensen, Lars F. Lundegaard, Pablo Beato, Raul Montesano, Jens Sehested
Summary: A new high-temperature water gas shift catalyst based on K-promoted ZnO/ZnAl2O4 has been found to be more effective than traditional Fe/Cr oxide catalysts. This research focuses on the optimization of the catalyst system, including the promotion with alkali metals and the structural characterization. The results show that K promotion significantly increases the catalyst's activity, and the optimum K content is 2.1wt%. The promotion by K is both structural and electronic in nature.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Jiang-Wei An, Gui-Chang Wang
Summary: The addition of alkali metal promoter is significant to improve the performance of copper catalyst in water-gas shift reaction (WGSR), and density functional theory calculations and microkinetic modeling analysis were performed to explore the effect of K on WGSR. The results showed that K can promote WGSR by enhancing the adsorption strength of H2O and reducing the barrier of H2O dissociation. The promoting effect of alkali metal follows the order of Li < Na < K < Rb < Cs.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Fengjiao Quan, Guangming Zhan, Pengfei Xu, Wenjuan Shen, Falong Jia, Lizhi Zhang, Jianfen Li
Summary: The study proposes a maximum orbital overlapping strategy to select suitable transition metal catalysts for the electrocatalytic nitrogen reduction reaction (ENRR). By introducing La single-atom catalysts onto the surface of few-layer MoS2, the Faradaic efficiency of NH3 was greatly improved to 18.2%.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Peng Wang, Jiafan Qu, Yadong Wei, Hongyan Shi, Jian Wang, Xiudong Sun, Weiqi Li, Wenjun Liu, Bo Gao
Summary: This study systematically investigates the residues from alkali metal compounds in CVD growth, revealing their role in inducing the spontaneous n-doping effect on monolayer MoS2. It is found that the doping level can be controlled by varying the amount of promoter used in the growth process.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Haoyue Fu, Weixin Qian, Haitao Zhang, Hongfang Ma, Weiyong Ying
Summary: Unmodified Cr/Al2O3 and Cr/Al2O3 doped with different alkali metals (Li, Na, K) were prepared using the incipient wetness impregnation method. The surface elements of all catalysts were evenly distributed and well loaded, and the addition of alkali metals did not alter the crystal structure and surface texture. Both Cr6+ and Cr3+ species were present on all catalysts, and the addition of alkali metals increased the amount of Cr6+ species, which were mainly converted into active Cr3+ species during the reaction, thereby enhancing the initial propane conversion. The addition of alkali metals reduced the total acid sites and strong acid sites of the catalyst, inhibiting side reactions and carbon deposition, and reducing catalyst deactivation. Cr-0.5Na/Al2O3 exhibited the best catalytic performance and the lowest carbon deposition.
Article
Chemistry, Physical
Qian Zhang, Sen Wang, Rui Geng, Pengfei Wang, Mei Dong, Jianguo Wang, Weibin Fan
Summary: In this study, various Cr-modified CuFe catalysts were prepared and their catalytic performance and reaction mechanism in CO2 hydrogenation to C2+OH were investigated. The introduction of small amounts of Cr enhanced the interaction between Cu and Fe species, alleviating CO over-dissociation and inhibiting the generation of iron carbides. The Cr(1%)-CuFe catalyst exhibited high CO2 conversion, C2+OH selectivity, and space-time yield (STY).
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Fangqian Han, Liu Qian, Qianru Wu, Dong Li, Shulan Hao, Lihu Feng, Liantao Xin, Tao Yang, Jin Zhang, Maoshuai He
Summary: A SiC supported iron (Fe-SiC) catalyst was developed for efficient growth of carbon nanotubes. The reducibility of the catalyst was enhanced by physical contact with oxide support, promoting the formation of active Fe nanoparticles for subsequent carbon nanotube synthesis.
Article
Engineering, Chemical
Mengzhen Zhao, Yao Xiang, Xuping Jiao, Bo Cao, Shoufeng Tang, Ziye Zheng, Xiaoyu Zhang, Tifeng Jiao, Deling Yuan
Summary: Fenton reaction is widely used for treating organic contaminants, but faces limitations such as narrow pH range, disproportionate decomposition of H2O2, and low efficiency of Fe2+/Fe3+ circulation. An improved Fenton-like method using CaO2 instead of H2O2 and MoS2 as a co-catalyst has been proposed to overcome these issues, achieving efficient removal of organic dyes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Physical
Bhanupratap Singh Solanki, Hyun-Seog Roh, Chandrashekhar V. Rode
Summary: Various Cs promoted Mn catalysts were synthesized and investigated for selective oxidation of 5-HMF to DFF. Among them, Mn-Cs(80:20) showed the highest conversion of 5-HMF (91%) and selectivity to DFF (99%). The inclusion of Cs in the Mn lattice domain resulted in enhanced surface area, porosity, thermal stability, and dual morphologies, which further improved the crystallinity and oxygen diffusion on the surface. The catalyst exhibited a mixed morphology comprising nanoparticles and nanocubes, which weakened the Mn-O bonds, increased the redox potential, and reduced the work function.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Physical
Caimei He, Lisan Cui, Xiangsi Wu, Yezheng Cai, Zhaoling Ma, Xinxian Zhong, Hongqiang Wang, Qingyu Li, Youguo Huang, Qichang Pan
Summary: The MoS2-SnS/NPC heterostructure, coupled with oxophilic SnS, exhibited superior catalytic activity and stability for oxygen reduction reaction compared to MoS2/NPC and SnS/NPC, showing promising prospects for efficient energy conversion. The improved catalytic performance was attributed to the synergistic effect of MoS2, SnS, S vacancy, and porous carbon sheets, indicating a successful heterojunction strategy for boosting ORR electrocatalysis.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Chemistry, Physical
Paivi Maki-Arvela, Atte Aho, Irina Simakova, Dmitry Yu Murzin
Summary: Recent developments in the transformation of syngas to higher alcohols are critically summarized in this review. The production of jet fuel from alcohols has gained interest due to the urgent need for sustainable sources. Different pathways and catalysts are discussed, along with the challenges of increasing selectivity and suppressing the formation of unwanted byproducts.
Article
Chemistry, Inorganic & Nuclear
Chunhong Qu, Jian Cao, Yanli Chen, Maobin Wei, Xiaoyan Liu, Bo Feng, Shuting Jin, Ao Xu, Doudou Jin, Lili Yang
Summary: Hollow hetero-nanosheet arrays derived from ZIF-67 were fabricated and demonstrated high catalytic activity and stability for water splitting.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
Andrey S. Skrypnik, Sergey A. Petrov, Vita A. Kondratenko, Qingxin Yang, Alexander A. Matvienko, Evgenii Kondratenko
Summary: A series of catalysts for CO2 hydrogenation to higher (C2+) hydrocarbons were prepared by decomposing iron (II) oxalate dihydrate impregnated with Li, Na, K, Rb or Cs carbonate. The structural characteristics of these catalysts, including the presence and type of promoter, determine their activity and product selectivity. Fe3C favors CH4 formation, while C2+-hydrocarbons are formed over Fe5C2. The rate of C2+-hydrocarbons formation is positively correlated with the rate constant of CO2 dissociation and negatively correlated with the rate of CO2 methanation.
JOURNAL OF CATALYSIS
(2023)
Article
Engineering, Chemical
Hisham S. Bamufleh, Sharif F. Zaman
Summary: This study investigated the thermocatalytic decomposition of NH3 using a bulk Mo2N catalyst boosted by alkali metals. The K-Mo2N catalyst showed the best catalytic performance, achieving 100% conversion of NH3 at 600 degrees C and 6000 h(-1) GHSV. Compared to other catalysts, K-Mo2N had the highest activity, with 80% NH3 conversion at a lower temperature of 550 degrees C.
Article
Chemistry, Physical
Thearum Rin, Chayanoot Sangwichien, Ram Yamsaengsung, Taweesak Reungpeerakul
Summary: Highly active Ni-Li-B catalysts were fabricated in this study, and aluminum-water reaction tests showed significantly increased yield and hydrogen generation rate when all prepared catalysts were added. The Ni-Li-B (XLiCl= 0.1 g) catalyst exhibited the highest cumulative hydrogen volume and average hydrogen production rate in the experiments.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)