Role of catalyst defect sites towards product selectivity in the upgrading of vacuum residue

Fuel ◽  
2022 ◽  
Vol 314 ◽  
pp. 123062
Author(s):  
Ravindra Prajapati ◽  
Kirtika Kohli ◽  
Samir K Maity
Keyword(s):  
Vacuum Residue ◽  
Product Selectivity ◽  
Defect Sites

γ-Alumina: The Essential and Unexpected Role of Water for the Structure, Stability, and Reactivity of “Defect” Sites

2012 ◽  
Vol 134 (35) ◽  
pp. 14430-14449 ◽  
Author(s):  
Raphael Wischert ◽  
Pierre Laurent ◽  
Christophe Copéret ◽  
Françoise Delbecq ◽  
Philippe Sautet
Keyword(s):  
Structure Stability ◽  
Defect Sites

The role of keto defect sites for the emission properties of polyfluorene-type materials

2003 ◽  
Vol 139 (3) ◽  
pp. 759-763 ◽  
Author(s):  
Emil J.W List ◽  
M Gaal ◽  
Roland Guentner ◽  
Patricia Scandiucci de Freitas ◽  
Ullrich Scherf
Keyword(s):  
Emission Properties ◽  
Defect Sites

scholarly journals The role of thermal analysis in the development of high-iron-content kaolinite-based photocatalysts

2020 ◽  
Vol 142 (1) ◽  
pp. 289-299
Author(s):  
Veronika Vágvölgyi ◽  
Katalin Győrfi ◽  
Balázs Zsirka ◽  
Erzsébet Horváth ◽  
János Kristóf
Keyword(s):  
Iron Content ◽  
Adsorbed Water ◽  
Acid Base ◽  
High Iron Content ◽  
High Iron ◽  
Defect Sites ◽  
Heating Water ◽  
Coordinated Water

Abstract Dynamic and controlled-rate thermogravimetric analyses have been carried out on acid-treated (11 and 5.8 M HCl), high-iron-content kaolinites as potential photocatalysts. The mineral contaminants were determined by XRD, while the defect sites of reduced coordination number obtained by surface treatments were identified with 27Al MAS NMR spectroscopy. Upon heating, water is evolved from the surface-treated samples in three main stages: (1) removal of adsorbed water up to ~ 200 °C, (2) goethite dehydroxylation between 200 and 350 °C and (3) dehydroxylation of the clay in the 300–700 °C temperature range. Identification of water released from the above mass loss steps is difficult due to the significant overlap of steps 2 and 3, as well as to the presence of coordinated water at broken edges and defect sites (–OH2+ groups). As a result, the thermal behavior of surface-treated kaolinites should be taken into account both in the preparation of hybrids/composites and in the acid–base characterization of the catalytic surface.

The role of in situ generated morphological motifs and Cu(i) species in C2+ product selectivity during CO2 pulsed electroreduction

Nature Energy ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 317-325 ◽  
Author(s):  
Rosa M. Arán-Ais ◽  
Fabian Scholten ◽  
Sebastian Kunze ◽  
Rubén Rizo ◽  
Beatriz Roldan Cuenya
Keyword(s):  
Product Selectivity

scholarly journals The Role of Defect Sites in Nanomaterials for Electrocatalytic Energy Conversion

Chem ◽  
2019 ◽  
Vol 5 (6) ◽  
pp. 1371-1397 ◽  
Author(s):  
Yi Jia ◽  
Kun Jiang ◽  
Haotian Wang ◽  
Xiangdong Yao
Keyword(s):  
Energy Conversion ◽  
Defect Sites

scholarly journals CO2 Hydrogenation over Oxide-Supported PtCo Catalysts: The Role of the Oxide Support in Determining the Product Selectivity

2016 ◽  
Vol 128 (28) ◽  
pp. 8100-8105 ◽  
Author(s):  
Shyam Kattel ◽  
Weiting Yu ◽  
Xiaofang Yang ◽  
Binhang Yan ◽  
Yanqiang Huang ◽  
...  
Keyword(s):  
Co2 Hydrogenation ◽  
Product Selectivity ◽  
Oxide Support

scholarly journals Restructuring Ni/Al2O3 by addition of Ga to shift product selectivity in CO2 hydrogenation: The role of hydroxyl groups

2022 ◽  
Vol 57 ◽  
pp. 101881
Author(s):  
Ali M. Bahmanpour ◽  
Rob Jeremiah G. Nuguid ◽  
Louisa M. Savereide ◽  
Mounir D. Mensi ◽  
Davide Ferri ◽  
...  
Keyword(s):  
Co2 Hydrogenation ◽  
Hydroxyl Groups ◽  
Product Selectivity
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