Hydrogenation CO2 to Formic Acid over Ru Supported on γ-Al2O3 Nanorods

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.821-822.1330 ◽

2013 ◽

Vol 821-822 ◽

pp. 1330-1335 ◽

Cited By ~ 5

Author(s):

Na Liu ◽

Rong Jun Du ◽

Wei Li

Keyword(s):

Catalytic Activity ◽

Formic Acid ◽

Nitrogen Adsorption ◽

Hydroxyl Groups ◽

Highly Dispersed ◽

Adsorption Measurement

A series of catalysts made of ruthenium loaded on γ-Al2O3 and γ-Al2O3 nanorods were tested for hydrogenation CO2 to formic acid. Among these catalysts, the catalyst 2% Ru/Al (n) gave the highest activity for hydrogenation CO2 reaction with the yield of formic acid up to 13.6 mmol /h. The excellent catalytic activity is related to the highly dispersed ruthenium species on the surface of support and abundant hydroxyl groups of the support. The dispersion of ruthenium species and the hydroxyl groups of supports were studied by characterization of XRD, nitrogen adsorption measurement, TEM, D2/exchange and H2-TPR in detail. The γ-Al2O3 nanorods lead to the highly dispersed ruthenium species and abundant hydroxyl groups, which appears to be more effective for hydrogenation CO2 to formic acid.

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The Influence of Preparation Procedures on Hydrogenation CO2 to Formic Acid over Supported Ru Catalysts

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.881-883.283 ◽

2014 ◽

Vol 881-883 ◽

pp. 283-286 ◽

Cited By ~ 1

Author(s):

Na Liu ◽

Jie Lei ◽

Meng Yao Li ◽

Peng Wang

Keyword(s):

Catalytic Activity ◽

Formic Acid ◽

Ruthenium Oxide ◽

Nitrogen Adsorption ◽

Preparation Procedure ◽

Ru Catalysts ◽

Optimal Activity ◽

Adsorption Measurement ◽

Hydrogenation Of Co ◽

Catalytic Performances

A series of catalysts made of ruthenium loaded on γ-Al2O3 nanorods were prepared to study the effects of preparation procedure on their catalytic performances for hydrogenation CO2 to formic acid. The catalysts are characterized by XRD, nitrogen adsorption measurement and H2-TPR in detail. The results reveal that the catalytic activity is determined by the structure of supported ruthenium oxide species. The dispersion of RuOx is influenced by the preparation procedures. Optimal activity of catalyst for the hydrogenation of CO2 to formic acid is achieved over a γ-Al2O3 nanorods supported 2.0 wt% ruthenium catalyst, which is prepared by calcinations at 573 K in flowing air for 6h.

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Characterization of Modified HZSM–5 with Gallium and its Reactivity in Direct Conversion of Methane to Liquid Hydrocarbons

Jurnal Teknologi ◽

10.11113/jt.v35.617 ◽

2012 ◽

Author(s):

Nor Aishah Saidina Amin ◽

Asmadi Ali

Keyword(s):

Catalytic Activity ◽

Ion Exchange ◽

Zeolite Catalyst ◽

Nitrogen Adsorption ◽

Direct Conversion ◽

Liquid Hydrocarbons ◽

Exchange Method ◽

Conversion Of Methane ◽

Ion Exchange Method

Mangkin zeolit HZSM–5 diubahsuai secara kaedah pertukaran ion berasid bagi menghasilkan mangkin zeolit Ga–HZSM–5. Aktiviti bermangkin bagi HZSM–5 dan Ga–HZSM–5 dikaji pada suhu tindak balas 800°C dan halaju ruang jaman masa (GHSV) 7500 jam–1. Mangkin HZSM–5 dan Ga–HZSM–5 dicirikan secara XRD, NMR, Penjerapan Nitrogen dan TPD. Hasil pencirian menunjukkan aluminium keluar dari kerangka asal. HZSM–5 yang mengandungi galium adalah mangkin yang lebih baik daripada mangkin zeolit HZSM–5 bagi menghasilkan cecair hidrokarbon. Kata kunci: Ga-HZSM-5; metana; pertukaran ion berasid; cecair hidrokarbon The HZSM–5 zeolite catalyst was modified by an acidic ion exchange method to produce the Ga–HZSM–5 zeolite catalyst. The catalytic activity of HZSM–5 and Ga–HZSM–5 were studied at reaction temperature of 800°C and gas hourly space velocities (GHSV) of 7500 hr–1. HZSM–5 and Ga–HZSM–5 catalysts were characterized by XRD, NMR, Nitrogen Adsorption and TPD. The characterization results revealed that aluminium was removed from the parent framework. Gallium loaded HZSM–5 is a better catalyst than HZSM–5 zeolite catalyst to produce liquid hydrocarbons. Key words: Ga-HZSM-5; methane; acidic ion exchange; liquid hydrocarbons

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Highly efficient hydrogen generation from formic acid using a reduced graphene oxide-supported AuPd nanoparticle catalyst

Chemical Communications ◽

10.1039/c5cc10311h ◽

2016 ◽

Vol 52 (22) ◽

pp. 4171-4174 ◽

Cited By ~ 73

Author(s):

Xinchun Yang ◽

Pradip Pachfule ◽

Yao Chen ◽

Nobuko Tsumori ◽

Qiang Xu

Keyword(s):

Graphene Oxide ◽

Catalytic Activity ◽

Formic Acid ◽

Reduced Graphene Oxide ◽

Noble Metal ◽

Hydrogen Generation ◽

Alloy Nanoparticles ◽

Reduced Graphene ◽

Highly Dispersed ◽

Nanoparticle Catalyst

Highly dispersed AuPd alloy nanoparticles have been successfully immobilized on reduced graphene oxide using a facile non-noble metal sacrificial method, which exhibit the highest catalytic activity for dehydrogenation of formic acid at 323 K.

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Synthesis, Fabrication, and Characterization of Functionalized Polydiacetylene Containing Cellulose Nanofibrous Composites for Colorimetric Sensing of Organophosphate Compounds

Nanomaterials ◽

10.3390/nano11081869 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1869

Author(s):

A K M Mashud Alam ◽

Donovan Jenks ◽

George A. Kraus ◽

Chunhui Xiang

Keyword(s):

Solid State ◽

Hydroxyl Groups ◽

Colorimetric Sensing ◽

Electrospinning Technique ◽

Hazardous Chemical ◽

Tensile Tester ◽

Vis Spectroscopy ◽

Ft Ir ◽

Landmark Study

Organophosphate (OP) compounds, a family of highly hazardous chemical compounds included in nerve agents and pesticides, have been linked to more than 250,000 annual deaths connected to various chronic diseases. However, a solid-state sensing system that is able to be integrated into a clothing system is rare in the literature. This study aims to develop a nanofiber-based solid-state polymeric material as a soft sensor to detect OP compounds present in the environment. Esters of polydiacetylene were synthesized and incorporated into a cellulose acetate nanocomposite fibrous assembly developed with an electrospinning technique, which was then hydrolyzed to generate more hydroxyl groups for OP binding. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), Instron® tensile tester, contact angle analyzer, and UV–Vis spectroscopy were employed for characterizations. Upon hydrolysis, polydiacetylene esters in the cellulosic fiber matrix were found unaffected by hydrolysis treatment, which made the composites suitable for OP sensing. Furthermore, the nanofibrous (NF) composites exhibited tensile properties suitable to be used as a textile material. Finally, the NF composites exhibited colorimetric sensing of OP, which is visible to the naked eye. This research is a landmark study toward the development of OP sensing in a protective clothing system.

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Synthesis, Characterization of Chitosan-Aluminum Oxide Nanocomposite for Green Synthesis of Annulated Imidazopyrazol Thione Derivatives

Polymers ◽

10.3390/polym13071160 ◽

2021 ◽

Vol 13 (7) ◽

pp. 1160

Author(s):

Abir S. Abdel-Naby ◽

Sara Nabil ◽

Sarah Aldulaijan ◽

Ibtisam M. Ababutain ◽

Azzah I. Alghamdi ◽

...

Keyword(s):

Catalytic Activity ◽

Aluminum Oxide ◽

Reaction Medium ◽

Thiol Group ◽

Docking Studies ◽

Significant Loss ◽

Gram Negative Bacteria ◽

Organic Catalyst ◽

Group 1

Chitosan-aluminum oxide nanocomposite was synthesized, characterized, and used as a green heterogeneous catalyst to synthesize novel imidazopyrazolylthione derivatives. Nanocomposite polymeric material was characterized by EDS-SEM and XRD. The powerful catalytic activity, and its base character of the nanocomposite, was used to synthesize imidazopyrazolylthione (1) in a good yield compared to traditional cyclocondensation synthesis. Using the nanocomposite catalyst, substitution of the thiol group (1) afforded the corresponding thiourea (2) and the corresponding ester (3). The efficiency of the nanocomposite over the traditional base organic catalyst, Et3N and NaOH, makes it an effective, economic, and reproducible nontoxic catalyst. Moreover, the heterogeneous nanocomposite polymeric film was easily isolated from the reaction medium, and recycled up to four times, without a significant loss of its catalytic activity. The newly synthesized derivatives were screened as antibacterial agents and showed high potency. Molecular docking was also performed for a more in-depth investigation. The results of the docking studies have demonstrated that the docked compounds have strong interaction energies with both Gram-positive and Gram-negative bacteria.

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Superior catalytic activity of Pt/carbon nanohorns nanocomposites toward methanol and formic acid oxidation reactions

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2017.09.109 ◽

2018 ◽

Vol 511 ◽

pp. 77-83 ◽

Cited By ~ 23

Author(s):

Chengxi Zhu ◽

Dong Liu ◽

Zhi Chen ◽

Libo Li ◽

Tianyan You

Keyword(s):

Catalytic Activity ◽

Formic Acid ◽

Formic Acid Oxidation ◽

Acid Oxidation ◽

Oxidation Reactions ◽

Carbon Nanohorns

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Electrodeposited PdNi2 alloy with novelly enhanced catalytic activity for electrooxidation of formic acid

Electrochemistry Communications ◽

10.1016/j.elecom.2010.03.046 ◽

2010 ◽

Vol 12 (6) ◽

pp. 843-846 ◽

Cited By ~ 47

Author(s):

Chunyu Du ◽

Meng Chen ◽

Wengang Wang ◽

Geping Yin ◽

Pengfei Shi

Keyword(s):

Catalytic Activity ◽

Formic Acid

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Tyrosinase Nanoparticles: Understanding the Melanogenesis Pathway by Isolating the Products of Tyrosinase Enzymatic Reaction

International Journal of Molecular Sciences ◽

10.3390/ijms22020734 ◽

2021 ◽

Vol 22 (2) ◽

pp. 734

Author(s):

Paul K. Varghese ◽

Mones Abu-Asab ◽

Emilios K. Dimitriadis ◽

Monika B. Dolinska ◽

George P. Morcos ◽

...

Keyword(s):

Catalytic Activity ◽

Large Scale ◽

Magnetic Beads ◽

Enzymatic Reaction ◽

Oculocutaneous Albinism ◽

Transmission Electron ◽

Hill Kinetics ◽

Rate Limiting ◽

Human Tyrosinase

Human Tyrosinase (Tyr) is the rate-limiting enzyme of the melanogenesis pathway. Tyr catalyzes the oxidation of the substrate L-DOPA into dopachrome and melanin. Currently, the characterization of dopachrome-related products is difficult due to the absence of a simple way to partition dopachrome from protein fraction. Here, we immobilize catalytically pure recombinant human Tyr domain (residues 19–469) containing 6xHis tag to Ni-loaded magnetic beads (MB). Transmission electron microscopy revealed Tyr-MB were within limits of 168.2 ± 24.4 nm while the dark-brown melanin images showed single and polymerized melanin with a diameter of 121.4 ± 18.1 nm. Using Hill kinetics, we show that Tyr-MB has a catalytic activity similar to that of intact Tyr. The diphenol oxidase reactions of L-DOPA show an increase of dopachrome formation with the number of MB and with temperature. At 50 °C, Tyr-MB shows some residual catalytic activity suggesting that the immobilized Tyr has increased protein stability. In contrast, under 37 °C, the dopachrome product, which is isolated from Tyr-MB particles, shows that dopachrome has an orange-brown color that is different from the color of the mixture of L-DOPA, Tyr, and dopachrome. In the future, Tyr-MB could be used for large-scale productions of dopachrome and melanin-related products and finding a treatment for oculocutaneous albinism-inherited diseases.

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