Regenerable Fe–Mn–ZnO/SiO2sorbents for room temperature removal of H2S from fuel reformates: performance, active sites, Operando studies

2011 ◽  
Vol 13 (6) ◽  
pp. 2179-2187 ◽  
Author(s):  
Priyanka Dhage ◽  
Alexander Samokhvalov ◽  
Divya Repala ◽  
Evert C. Duin ◽  
Bruce J. Tatarchuk
Keyword(s):  
Active Sites ◽  
Room Temperature ◽  
Operando Studies

Catalytic activity of CuGHK peptide-based porous material

2021 ◽  
Author(s):  
Francisco G. Cirujano ◽  
Nuria Martin ◽  
Neyvis Almora-Barrios ◽  
Carlos Martí-Gastaldo
Keyword(s):  
Catalytic Activity ◽  
Porous Material ◽  
Active Sites ◽  
Room Temperature ◽  
Side Chain ◽  
Periodic Distribution ◽  
Lysine Side Chain ◽  
One Step

Room temperature one-step synthesis of the peptide-based porous material with a periodic distribution of pockets decorated with lysine side chain active sites behaves as a heterogeneous organocatalyst. The pockets are...

scholarly journals ZnO/RGO Heterojunction Based near Room Temperature Alcohol SENSOR with Improved Efficiency

2021 ◽  
Vol 6 (1) ◽  
pp. 25
Author(s):  
Sanghamitra Ghosal ◽  
Partha Bhattacharyya
Keyword(s):  
Active Sites ◽  
Room Temperature ◽  
Surface Engineering ◽  
Gas Sensing ◽  
Energy Band Diagram ◽  
Future Generation ◽  
High Yield ◽  
Synthesis Process ◽  
Ethanol Sensor ◽  
Vapor Sensing

The systematic optimization of surface engineering (dimensionality) indeed plays a crucial role in achieving efficient vapor-sensing performance. Among various semiconducting metal oxides, owing to some of its unique features and advantages, ZnO has attracted researchers on a global scale due to its application in various fields, including chemical sensors. The concomitant optimization of the surface attributes (varying different dimensions) of ZnO have become a sensation for the entire research community. Moreover, the small thickness and extremely large surface of exfoliated 2D nanosheets render the gas sensing material an ideal candidate for achieving strong coupling with different gas molecules. However, temperature is a crucial factor in the field of chemical sensing. Recently, graphene-based gas sensors have attracted attention due to their variety of structures, unique sensing performances and room temperature working conditions. In this work, a highly sensitive and fast responsive low temperature (60 °C)-based ethanol sensor, based on RGO/2D ZnO nanosheets hybrid structure, is reported. After detailed characterizations, the vapor sensing potentiality of this sensor was tested for the detection of ethanol. The ethanol sensor offered the response magnitude of 89% (100 ppm concentration) with response and recovery time of 12 s/29 s, respectively. Due to excessively high number of active sites for VOC interaction, with high yield synthesis process and appreciably high carrier mobility, this has paved the way for developing future generation, miniaturized and flexible (wearable) vapor sensor devices, meeting the multidimensional requirements for traditional and upcoming (health/medical sector) applications. The underlying mechanistic framework for vapor sensing, using this hybrid junction, is explained with the Energy Band Diagram.

Room temperature oxidation of active sites in coal under multi-factor conditions and corresponding reaction mechanism

Fuel ◽  
2019 ◽  
Vol 256 ◽  
pp. 115901 ◽  
Author(s):  
Jinhu Li ◽  
Zenghua Li ◽  
Yongliang Yang ◽  
Junhao Niu ◽  
Qingxia Meng
Keyword(s):  
Reaction Mechanism ◽  
Active Sites ◽  
Room Temperature ◽  
Temperature Oxidation

Anomalous behavior of glutathione reductase on dilution.

1976 ◽  
Vol 22 (7) ◽  
pp. 1005-1008 ◽  
Author(s):  
R J Spooner ◽  
A Delides ◽  
D M Goldberg
Keyword(s):  
Glutathione Reductase ◽  
Active Sites ◽  
Room Temperature ◽  
Reductase Activity ◽  
Biliary Tract Disease ◽  
Anomalous Behavior ◽  
Prolonged Contact ◽  
Clinical Disorders ◽  
Glutathione Reductase Activity ◽  
Tract Disease

Abstract Serum glutathione reductase activity decreases on standing at room temperature. Dilution of the sample slows this decay in sera from patients with a variety of clinical disorders, and reverses the inactivation in sera from patients with liver or biliary tract disease. Prolonged contact with dithioeythritol or acetate buffer, pH 6.4, at 4 degrees C prevents spontaneous inactivation of the native serum and abolishes the effect of dilution. These hitherto unreported phenomena are a source of potential inaccuracy in assays for this enzyme. The inactivation may be the result of conformational folding with "burying" of active sites, or of molecular aggregation brought about by hydrogen bonding or disulfide bond formation.

The room temperature electrochemical synthesis of N-doped graphene and its electrocatalytic activity for oxygen reduction

2015 ◽  
Vol 51 (7) ◽  
pp. 1198-1201 ◽  
Author(s):  
Feng-Xiang Ma ◽  
Jiong Wang ◽  
Feng-Bin Wang ◽  
Xing-Hua Xia
Keyword(s):  
Oxygen Reduction ◽  
Electrochemical Synthesis ◽  
Electrocatalytic Activity ◽  
Active Sites ◽  
Room Temperature ◽  
N Source ◽  
N Doping ◽  
Doped Graphene ◽  
Electrochemical Energy

N doping in graphene can be achieved using a facile and mild approach using electrochemical energy at room temperature with ammonia as the N source, which occurs at the carbon active sites generated in situ during the removal of oxygen containing species at cathodic potentials.

Enhanced NO2 sensing performance of S-doped biomorphic SnO2 with increased active sites and charge transfer at room temperature

2020 ◽  
Vol 7 (10) ◽  
pp. 2031-2042
Author(s):  
Wenna Li ◽  
Lang He ◽  
Xue Bai ◽  
Lujia Liu ◽  
Muhammad Ikram ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Active Sites ◽  
Room Temperature ◽  
Gas Sensing ◽  
Chemical Bonds ◽  
Sensing Performance

S-Doped biomorphic SnO2 with active S-terminations and S–Sn–O chemical bonds has significantly improved gas sensing performance to NO2 at room temperature.

A Sb2Se3/Palygorskite Nanocomposite Catalyst for p-Nitrophenol Reduction

NANO ◽  
2019 ◽  
Vol 14 (09) ◽  
pp. 1950113
Author(s):  
Lin Tan ◽  
Aidong Tang ◽  
Muen He ◽  
Xin Wen ◽  
Laifu Zhong ◽  
...  
Keyword(s):  
Active Sites ◽  
Room Temperature ◽  
Catalytic Reduction ◽  
Ammonium Bromide ◽  
High Catalytic Activity ◽  
Optimal Dosage ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Nitrophenol Reduction ◽  
New Ideas ◽  
Cetyltrimethyl Ammonium

A nanocomposite consisting of rod-like Sb2Se3 and fiberous palygorskite (Pal) was prepared using cetyltrimethyl ammonium bromide (CTAB) as a pillaring agent to change Pal microstructure. CTAB optimal dosage was 0.2[Formula: see text]g (versus 0.388[Formula: see text]g of Pal). Sb2Se3/Pal has a high catalytic activity towards the catalytic reduction of [Formula: see text]-nitrophenol to [Formula: see text]-aminophenol while in the presence of NaBH4 at room temperature. The excellent performance is attributed to dispersion of rod-like Sb2Se3 in fiberous Pal which promoted more active sites exposure. The results provide new ideas for preparing new catalysts.

Chemisorption of oxygen and hydrogenation of ethylene on sulphided Co-Mo/Al2O3 catalyst. Effect of activation process

1989 ◽  
Vol 54 (8) ◽  
pp. 2069-2082 ◽  
Author(s):  
Hana Zahradníková ◽  
Ludvík Beránek
Keyword(s):  
Active Sites ◽  
Room Temperature ◽  
Dynamic Method ◽  
Activation Process ◽  
Subsequent Reduction ◽  
Oxygen Chemisorption ◽  
Hydrogenation Reactions ◽  
Catalyst Effect ◽  
Al2o3 Catalyst ◽  
Hydrogenation Of Ethylene

Oxygen chemisorption by pulse dynamic method at room temperature and the activity for ethylene hydrogenation at 300 °C in a flow regime were determined for Co-Mo/Al2O3 catalyst CHEROX 36-01 sulphided by a H2S/H2 (1:10) mixture at 400 °C. The measurements were carried out either immediately after sulphidation or after subsequent reduction of the sulphided catalyst by hydrogen. The chemisorption of oxygen was measured both prior to and after the catalytic reaction. In addition, the reactivation of the catalyst was examined after its passivation by oxygen chemisorption. The reactivation was effected either by resulphidation or by reduction with hydrogen at 400 °C, on repeated reactivation also by combination of both procedures, variables being the time of activation and reactivation steps. The results are discussed from the standpoint of the structure and interrelation between active sites for oxygen chemisorption and catalytic, especially hydrogenation reactions. Formation of coordinately unsaturated sites and SH groups is emphasized. The reasons of possible failures in correlations between chemisorption capacity for oxygen and catalytic activity are mentioned.

Synthesis of polyoxometalate encapsulated in UiO-66(Zr) with hierarchical porosity and double active sites for oxidation desulfurization of fuel oil at room temperature

2020 ◽  
Vol 8 (37) ◽  
pp. 19396-19404 ◽  
Author(s):  
Gan Ye ◽  
Liangliang Hu ◽  
Yulong Gu ◽  
Christine Lancelot ◽  
Alain Rives ◽  
...  
Keyword(s):  
Active Sites ◽  
Room Temperature ◽  
Solvent Free ◽  
Fuel Oil ◽  
Hierarchical Porosity

POM/UiO-66(Zr) with hierarchical porosity and double active sites was synthesized by a solvent-free method for oxidation desulfurization of fuel oil.

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