scholarly journals Fumarase From Cyanidioschyzon merolae Stably Shows High Catalytic Activity for Fumarate Hydration Under High Temperature Conditions

2020 ◽  
Vol 11 ◽  
Author(s):  
Shoki Ito ◽  
Kaori Iwazumi ◽  
Haruna Sukigara ◽  
Takashi Osanai
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Cyanidioschyzon Merolae ◽  
High Catalytic Activity ◽  
Temperature Conditions

From Ru nanoparticle-encapsulated metal–organic frameworks to highly catalytically active Cu/Ru nanoparticle-embedded porous carbon

2017 ◽  
Vol 5 (10) ◽  
pp. 4835-4841 ◽  
Author(s):  
Pradip Pachfule ◽  
Xinchun Yang ◽  
Qi-Long Zhu ◽  
Nobuko Tsumori ◽  
Takeyuki Uchida ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Porous Carbon ◽  
Metal Organic Frameworks ◽  
Ammonia Borane ◽  
Carbon Composites ◽  
High Catalytic Activity ◽  
Catalytically Active ◽  
Metal Organic

High-temperature pyrolysis of Ru nanoparticle-encapsulated MOF (Ru@HKUST-1) afforded ultrafine Cu/Ru nanoparticle-embedded porous carbon composites (Cu/Ru@C), which show high catalytic activity for ammonia borane hydrolysis.

Effect of Different Iron Sources on In-Situ Growth of Zeolitic Imidazolate Frameworks-8: For Efficient Oxygen Reduction Electrocatalysts

2021 ◽  
Vol 21 (10) ◽  
pp. 5319-5328
Author(s):  
Sha-Sha Luo ◽  
Yu-Meng Ma ◽  
Peng-Wei Li ◽  
Ming-Hua Tian ◽  
Qiao-Xia Li
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Oxygen Reduction ◽  
High Performance ◽  
Low Cost ◽  
Three Dimensional ◽  
Precious Metals ◽  
High Catalytic Activity ◽  
Zeolitic Imidazolate Frameworks ◽  
Wide Range

Transition metal and nitrogen co-doped carbon-based catalysts (TM-N-C) have become the most promising catalysts for Pt/C due to their wide range of sources, low cost, high catalytic activity, excellent stability and strong resistance to poisoning, especially Fe–N–C metal-organic frameworks (MOFs), which are some of the most promising precursors for the preparation of Fe–N–C catalysts due to their inherent properties, such as their highly ordered three-dimensional framework structure, controlled porosity, and tuneable chemistry. Based on these, in this paper, different iron sources were added to synthesis a sort of zeolitic imidazole frameworks (ZIF-8). Then the imidazole salt in ZIF-8 was rearranged into high N-doped carbon by high-temperature pyrolysis to prepare the Fe–N–C catalyst. We studied the physical characteristics of the catalysts by different iron sources and their effects on the catalytic properties of the oxygen reduction reaction (ORR). From the point of morphology, various iron sources have a positive influence on maintaining the morphology of ZIF-8 polyhedron. Fe–N/C–Fe(NO3)3 has the same anion as zinc nitrate, and can maintain a polyhedral morphology after high-temperature calcination. It had the highest ORR catalytic activity compared to the other four catalyst materials, which proved that there is a certain relationship between morphology and performance. This paper will provide a useful reference and new models for the development of high-performance ORR catalysts without precious metals.

Acetylene hydrochlorination over 13X zeolite catalysts at high temperature

2016 ◽  
Vol 18 (22) ◽  
pp. 5994-5998 ◽  
Author(s):  
Zhijia Song ◽  
Guangye Liu ◽  
Dawei He ◽  
Xiaodong Pang ◽  
Yansi Tong ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
High Temperatures ◽  
Zeolite Catalysts ◽  
High Catalytic Activity ◽  
Acetylene Hydrochlorination ◽  
13X Zeolite

13X zeolite exhibited high catalytic activity in acetylene hydrochlorination at high temperatures.

Studying the catalytic activity of DBU and TBD upon water-initiated ROP of ε-caprolactone under different thermodynamic conditions

2019 ◽  
Vol 10 (44) ◽  
pp. 6047-6061 ◽  
Author(s):  
Andrzej Dzienia ◽  
Paulina Maksym ◽  
Barbara Hachuła ◽  
Magdalena Tarnacka ◽  
Tadeusz Biela ◽  
...  
Keyword(s):  
High Pressure ◽  
Catalytic Activity ◽  
High Temperature ◽  
Catalytic System ◽  
Temperature Conditions ◽  
High Pressure High Temperature ◽  
Thermodynamic Conditions

Studies performed revealed that a novel catalytic system for water-initiated ε-CL ROP based on DBU protonation showed enhanced performance under high-pressure/high-temperature conditions.

scholarly journals High catalytic activity of CuY catalysts prepared by high temperature anhydrous interaction for the oxidative carbonylation of methanol

RSC Advances ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 3293-3300 ◽  
Author(s):  
Yuchun Wang ◽  
Zhaorong Liu ◽  
Chao Tan ◽  
Hong Sun ◽  
Zhong Li
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Atmospheric Pressure ◽  
Dimethyl Carbonate ◽  
Oxidative Carbonylation ◽  
High Catalytic Activity

The CuY catalysts prepared by high temperature anhydrous interaction were activated under different atmospheres and the activities were measured for the oxidative carbonylation of methanol to dimethyl carbonate under atmospheric pressure.

Strong metal-support interaction between Pt and SiO2 following high-temperature reduction: a catalytic interface for propane dehydrogenation

2017 ◽  
Vol 53 (51) ◽  
pp. 6937-6940 ◽  
Author(s):  
Lidan Deng ◽  
Hiroki Miura ◽  
Tetsuya Shishido ◽  
Saburo Hosokawa ◽  
Kentaro Teramura ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Pt Nanoparticles ◽  
Propane Dehydrogenation ◽  
High Catalytic Activity ◽  
Support Interaction ◽  
Temperature Reduction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Smsi Effect

Pt/SiO2 directly reduced in H2 at 1073 K exhibited a high catalytic activity in propane dehydrogenation, primarily attributed to the electronic modification of Pt nanoparticles by the SMSI effect.

Nitrogen-doped active carbon as a metal-free catalyst for acetylene hydrochlorination

RSC Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 7461-7468 ◽  
Author(s):  
Chunli Zhang ◽  
Lihua Kang ◽  
Mingyuan Zhu ◽  
Bin Dai
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Active Carbon ◽  
Post Treatment ◽  
High Catalytic Activity ◽  
Acetylene Hydrochlorination ◽  
Nitrogen Doped ◽  
Metal Free

In this study, we report high catalytic activity for acetylene hydrochlorination by post-treatment of active carbon (AC) with polyaniline (PANI) followed by pyrolyzation at high temperature.

scholarly journals Hemin-bound cysteinyl bolaamphiphile self-assembly as a horseradish peroxidase-mimetic catalyst

RSC Advances ◽  
2017 ◽  
Vol 7 (62) ◽  
pp. 38989-38997 ◽  
Author(s):  
Chaemyeong Lee ◽  
Sang-Yup Lee
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Horseradish Peroxidase ◽  
Self Assembly ◽  
High Catalytic Activity ◽  
Peroxidase Mimetic

A horseradish peroxidase (HRP) mimetic catalyst was constructed by tethering hemin to the cysteinyl bolaamphiphile assembly through thiol–Fe bond. The prepared catalyst showed high catalytic activity comparable to HRP even at the high temperature.

Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2961-2972
Author(s):  
P.C. Meléndez-González ◽  
E. Garza-Duran ◽  
J.C. Martínez-Loyola ◽  
P. Quintana-Owen ◽  
I.L. Alonso-Lemus ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Anion Exchange ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Average Particle ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

Ordered Intermetallic Nanoparticles with High Catalytic Activity Prepared by an Electrochemically Induced Phase Transformation

2019 ◽  
Author(s):  
Du Sun ◽  
yunfei wang ◽  
Kenneth Livi ◽  
chuhong wang ◽  
ruichun luo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Diffusion Mechanism ◽  
Reduction Reaction ◽  
Atomic Scale ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Magnetic Devices ◽  
Disordered Alloys ◽  
Ordered Intermetallic ◽  
Intermetallic Nanoparticles

<div> <p>The synthesis of alloys with long range atomic scale ordering (ordered intermetallics) is an emerging field of nanochemistry. Ordered intermetallic nanoparticles are useful for a wide variety of applications such as catalysis, superconductors, and magnetic devices. However, the preparation of nanostructured ordered intermetallics is challenging in comparison to disordered alloys, hindering progress in materials development. We report a process for converting colloidally synthesized ordered intermetallic PdBi<sub>2</sub> to ordered intermetallic Pd<sub>3</sub>Bi nanoparticles under ambient conditions by an electrochemically induced phase transition. The low melting point of PdBi<sub>2</sub> corresponds to low vacancy formation energies which enables the facile removal of the Bi from the surface, while simultaneously enabling interdiffusion of the constituent atoms via a vacancy diffusion mechanism under ambient conditions. The resulting phase-converted ordered intermetallic Pd<sub>3</sub>Bi exhibits 11x and 3.5x higher mass activty and high methanol tolerance for the oxygen reduction reaction compared to Pt/C and Pd/C, respectively,which is the highest reported for a Pd-based catalyst, to the best of our knowledge. These results establish a key development in the synthesis of noble metal rich ordered intermetallic phases with high catalytic activity, and sets forth guidelines for the design of ordered intermetallic compounds under ambient conditions.</p> </div>

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