Article
Chemistry, Multidisciplinary
Yongye Zhao, Hongyan Xiao, Chen-Ho Tung, Li-Zhu Wu, Huan Cong
Summary: A new macrocycle RhombicArene has been developed, which forms a host-guest complex with CHON through C-H···π interactions and hydrogen bonds. The nonporous adaptive crystals of RhombicArene exhibit excellent capability for rapid, exclusive, and recyclable vapor adsorption of CHON in the presence of CHOL under mild and user-friendly conditions in just 30 minutes.
Article
Chemistry, Physical
Sonam Sancheti, Ganapati D. Yadav
Summary: In this study, the non-oxidative vapor phase dehydrogenation of cyclohexanol to cyclohexanone was successfully achieved using CuZnMg catalyst. The catalyst, prepared by co-precipitation method, exhibited high stability and reusability. Various characterization techniques were used to analyze the catalyst's performance.
MOLECULAR CATALYSIS
(2021)
Review
Nanoscience & Nanotechnology
Guangxin Xue, Linlin Yin, Shengxian Shao, Guodong Li
Summary: Phenol is an important platform molecule for synthesizing valuable chemical intermediates and products. The selective hydrogenation of phenol towards cyclohexanone or cyclohexanol has attracted great interest, but industrial application remains challenging. This review summarizes recent progress in selective hydrogenation of phenol with different catalysts, discussing the relationship between active components, support type, and catalyst performance, as well as the possible reaction mechanism and scale-up methods. Potential challenges and future developments of metal nanocatalysts for selective hydrogenation of phenol are also proposed.
Article
Chemistry, Physical
Huaiqi Shao, Qihuan He, Delong Wang, Yongxiang Zhang, Tao Jiang, Xiaoyan Guo
Summary: The CrOx/Zn-Al2O3 catalysts supported on Zn-modified alumina showed uniform foamed pores, high specific surface area, and large pore size. The zinc modification improved the dispersion of Cr6+ species and promoted the formation of active chromate species on the surface, enhancing propane conversion and propylene yield. Additionally, the zinc modifier inhibited the formation of coke deposition, leading to increased catalyst stability.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Heng Xia, Hongzi Tan, Hongyou Cui, Feng Song, Yuan Zhang, Rongrong Zhao, Zhe-Ning Chen, Weiming Yi, Zhihe Li
Summary: The selectivity of hydrogenation of phenol to cyclohexane or cyclohexanol over Pd/NaY catalyst can be achieved by regulating the solvent polarity. The solvent polarity greatly influences the reaction mechanism and product selectivity, as well as the adsorption manner of phenol in the catalyst.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Namgi Jeon, Jungmok Oh, Akhil Tayal, Beomgyun Jeong, Okkyun Seo, Sujin Kim, Iljun Chung, Yongju Yun
Summary: Co-based catalysts on Al2O3 support with different compositional distribution of Co species were prepared by heat-treating the precursor under O2, Ar, and H2 atmospheres. The H2-treated catalyst showed superior PDH performance due to higher Co surface concentration and higher ratio of tetrahedral Co2+ in Co-Al2O4. Both tetrahedral Co2+ and metallic Co were found to be active for PDH, with the former showing higher selectivity.
JOURNAL OF CATALYSIS
(2021)
Review
Energy & Fuels
Jing Gong, Shixin Hou, Yue Wang, Xinbin Ma
Summary: The dehydrogenation of cyclohexanol to cyclohexanone is an important step in the production of nylon fibers, and copper-based catalysts have shown exceptional low-temperature catalytic performance in this process. This paper reviews the research advances in active species, reaction mechanisms, factors affecting product selectivity, and deactivation behaviors of copper-based catalysts. It also provides a brief introduction to new processes and catalysts that break thermodynamic equilibrium via reaction coupling. These reviews can guide further investigations into catalysts and processes for cyclohexanol dehydrogenation.
TRANSACTIONS OF TIANJIN UNIVERSITY
(2023)
Article
Energy & Fuels
Hyun-tae Song, Ali Fazeli, Hyun Dong Kim, Ali Alizadeh Eslami, Young Su Noh, Nasim Ghaffari Saeidabad, Dong Ju Moon
Summary: Improving the activity of copper-based catalysts for methanol production from synthesis gas has a significant impact on both the economy and the environment. Utilizing CO2 in the process enhances sustainability using nanocatalysts. The addition of La, Ce, or Sm to the Cu/ZA500 catalysts results in increased CO2 conversion compared to the reference catalyst Cu/ZnO/Al2O3. Cu-La/ZA500 catalyst shows the highest CO2 conversion of around 25% with a methanol selectivity of 54.0% at 250 degrees C and 40 bar.
Article
Nanoscience & Nanotechnology
Lohit Sharma, Stephen C. Purdy, Katharine Page, Srinivas Rangarajan, Hien Pham, Abhaya Datye, Jonas Baltrusaitis
Summary: A series of Al2O3-supported Fe-containing catalysts were synthesized and studied, with varying iron surface densities. It was found that in sulfided form, iron was present as dispersed species, showing the highest activity and selectivity within a certain range of loadings.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Shuai Wang, Tianhan Zhu, Nan Jiang, Chunlei Zhang, Huan Wang, Yanguang Chen, Feng Li, Hua Song
Summary: A simple and controllable synthetic route was developed to prepare non-precious bimetallic NiCo(x/y)@C-T catalysts from NiCo(x/y)-MOF-74 for the hydrogenation of phenol, showing excellent performance with high selectivity and recyclability.
REACTION CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Zegang Qiu, Ying Wang, Yali Di, Xiaoxiong Ren, Weiwei Liu, Zhiqin Li, Guangyu Li
Summary: This study presents a 'shortcut' route for the transformation of alkylphenols by co-breaking the C-O and C-C bonds. Experimental results using 4-ethylphenol as a model compound showed high efficiency in achieving the co-breaking of C-O and C-C bonds. The influence of reaction conditions on the conversion rate and selectivity of products was investigated. Theoretical calculations also revealed the importance of the adsorption configuration of the alkylphenol molecule on the catalyst in the bond breaking process.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Fengqian Zhao, Patrizio Russo, Raffaella Mancuso, Bartolo Gabriele, Xiao-Feng Wu
Summary: A copper-catalyzed carbonylation of alkyl iodides with phenols is reported, yielding corresponding esters in good yields. Aliphatic alcohols are also suitable partners in this reaction.
JOURNAL OF CATALYSIS
(2022)
Article
Engineering, Chemical
Xue Cai, Zitong Zhang, Lili Cai, Xiaoyan Tian, Wending Chu, Weishen Yang
Summary: This study investigates the catalytic performance of Cr2O3/Al2O3 catalysts with different loadings and calcination processes in the dehydrogenation of propane. The results show that the catalysts calcined by air achieved higher propane conversion, while those calcined by H2/Ar exhibited better anticoking ability and resistance against deactivation. The difference in catalytic performance is attributed to the nature of Cr species, the dispersion, and the surface acidity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Yuliya Gulyaeva, Maria Alekseeva (Bykova), Olga Bulavchenko, Anna Kremneva, Andrey Saraev, Evgeny Gerasimov, Svetlana Selishcheva, Vasily Kaichev, Vadim Yakovlev
Summary: The study focused on the dehydrogenation of methylcyclohexane using high-loaded Ni-Cu catalysts, achieving high conversion and selectivity under optimal conditions. The research highlighted the importance of Cu distribution uniformity and its interaction with Ni in determining the catalytic performance.
Article
Chemistry, Applied
Jason A. Chalmers, Hyunjin Moon, Samantha F. Ausman, Cheng-Hsun Chuang, Susannah L. Scott
Summary: The effect of catalyst hydrophobicity on the kinetics of hydrogenation of aqueous phenol was studied. Changing the hydrophobicity of a Pd/SBA-15 catalyst was achieved by synthesizing an organosilane with biphenylene framework linkers. The hydrophobic catalyst demonstrated a higher rate of hydrogenation and selectivity for the partial hydrogenation product, cyclohexanone, at 75°C. Analysis of kinetic profiles using operando C-13 NMR showed that the hydrophobic catalyst had a larger apparent adsorption constant for phenol, resulting in higher phenol surface coverage and, consequently, faster and more selective hydrogenation to cyclohexanone.
TOPICS IN CATALYSIS
(2023)
Article
Engineering, Chemical
Alicia Checa-Fernandez, Aurora Santos, Arturo Romero, Carmen M. Dominguez
Summary: The alkaline activation of persulfate (PS) intensified by temperature showed high efficiency in remediation of surface sediments contaminated with HCH-wastes. Under optimal conditions, complete conversion of alpha-HCH and 81% conversion of beta-HCH, with a dechlorination degree of 94%, were achieved in just 3 days.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Editorial Material
Chemistry, Physical
Carmen M. Dominguez, Aurora Santos
Review
Chemistry, Physical
Alicia Checa-Fernandez, Aurora Santos, Arturo Romero, Carmen M. Dominguez
Summary: The chelate-modified Fenton process is an effective method for soil remediation, overcoming some limitations of conventional Fenton oxidation. However, there are still many challenges in applying this technology, requiring further research and exploration.
Article
Environmental Sciences
Raul Garcia-Cervilla, Aurora Santos, Arturo Romero, David Lorenzo
Summary: The research found that adding surfactant can enhance the ISCO process, however, in the presence of solubilized COCs, the concentration of surfactant will affect the efficiency of PS consumption.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Alicia Checa-Fernandez, Aurora Santos, Leandro O. Conte, Arturo Romero, Carmen M. Dominguez
Summary: The utilization of sonochemistry is a promising technology to enhance the decontamination of hydrophobic organic compounds (HOCs) in soil. Ultrasound (US) helps break down soil aggregates, facilitating the desorption of HOCs and their subsequent oxidation. Increasing US power accelerates the production of radicals and improves the degradation of pollutants.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Andres Sanchez-Yepes, Aurora Santos, Juana M. Rosas, Jose Rodriguez-Mirasol, Tomas Cordero, David Lorenzo
Summary: Chlorinated organic compounds (COCs) are commonly found in groundwater and industrial wastewaters. The in-situ regeneration of spent activated carbon using thermally activated sodium persulfate (TAP) was studied in this work. The physicochemical changes of the activated carbon before and after regeneration were investigated. The results showed that sulfate deposition on the activated carbon prevents the recovery of the initial adsorption capacity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Environmental Sciences
Leandro O. Conte, Carmen M. Dominguez, Alicia Checa-Fernandez, Aurora Santos
Summary: Chlorinated organic compounds are commonly found toxic pollutants in soil and groundwater. In this study, an innovative process using hydrogen peroxide and ferrioxalate with visible light-emitting diode lamp was used to successfully oxidize and dechlorinate 124-trichlorobenzene in a saturated aqueous solution. The effects of hydrogen peroxide concentration, ferrioxalate dosage, and irradiation level on conversion and dechlorination were studied and optimized using experimental design and response surface methodology. The results showed that under the optimized conditions, the method achieved efficient conversion and dechlorination of 124-trichlorobenzene.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Environmental Sciences
Patricia Saez, Aurora Santos, Raul Garcia-Cervilla, Arturo Romero, David Lorenzo
Summary: Surfactant enhanced aquifer remediation using volatilization technique was studied in this work. The thermodynamic parameters of the volatilization process were validated through experiments. The results showed that volatilization can effectively remove VOCs and the surfactant solution can be recycled.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Chemistry, Physical
Andres Sanchez-Yepes, David Lorenzo, Patricia Saez, Arturo Romero, Aurora Santos
Summary: The study found that PS concentration, irradiance, temperature, as well as chloride and carbonates have an impact on the removal of NAP. The highest photon efficiency was observed at a specific irradiance level, while higher concentrations of PS led to a self-inhibitory effect.
Article
Biochemistry & Molecular Biology
Aurora Santos, Raul Garcia-Cervilla, Alicia Checa-Fernandez, Carmen M. Dominguez, David Lorenzo
Summary: The discharge of lindane wastes in unlined landfills causes groundwater and soil pollution worldwide. In this study, the remediation of highly polluted soil using in situ chemical oxidation (ISCO) and simultaneous injection of surfactants and oxidants (S-ISCO) was investigated. The results showed that both treatments significantly reduced soil toxicity and organic extract toxicity, with the surfactant application proving to be suitable for full-scale applications.
Article
Environmental Sciences
Carmen M. Dominguez, Paula Ventura, Alicia Checa-Fernandez, Aurora Santos
Summary: This research investigates the acute toxicity of contaminated soils with hazardous chlorinated organic compounds. The study finds that the soils tested showed different levels of contamination and acute toxicity, highlighting the need for remediation. The researchers also observe that the concentration of COCs in the soil is related to their toxicity, and this relationship varies depending on the testing method used.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Chemical
Adriel Sosa, Juan Ortega, Luis Fernandez, Arturo Romero, Aurora Santos, David Lorenzo
Summary: This study analyzed the separation of impurities in the production of cyclohexanone and used predictive models, UNIFAC and COSMO-RS, to determine the possibility of removing these substances. Due to the lack of experimental data, these models were used to predict the behavior of the substances. The results, considered as an approximation, are discussed separately for each system.
Article
Engineering, Environmental
Raul Garcia-Cervilla, Aurora Santos, Arturo Romero, David Lorenzo
Summary: This study investigated the application of Surfactant Enhanced In-Situ Chemical Oxidation (S-ISCO) technique for the remediation of polluted soil with chlorinated organic compounds (COCs). The results showed that the addition of an appropriate amount of surfactant improved the reduction of COCs, while an excess of surfactant hindered the oxidation reaction and increased the unproductive consumption of the oxidant.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Raul Garcia-Cervilla, Aurora Santos, Arturo Romero, David Lorenzo
Summary: The study examined the equilibrium between surfactant adsorption and contaminants desorption in soil samples contaminated with residues from lindane production. Results showed that higher concentration of COCs in soil led to increased surfactant adsorption, especially irreversible adsorption in the case of nonionic surfactants. The study also found that surfactant adsorption followed the Langmuir model and the apparent partition coefficient predicted the partitioning of COCs between soil and aqueous phases.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Carmen M. Dominguez, Alicia Checa-Fernandez, Arturo Romero, Aurora Santos
Summary: The study aimed to investigate the effect of increasing reaction temperatures and initial oxidant concentrations on the removal of HCHs, finding that higher reaction temperatures and oxidant concentrations can accelerate the oxidation and dechlorination rates of HCHs, reducing the concentration of chlorinated byproducts.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(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)
