Desilication of SSZ-33 zeolite – Post-synthesis modification of textural and acidic properties

2015 ◽  
Vol 243 ◽  
pp. 46-52 ◽  
Author(s):  
Martin Kubů ◽  
Maksym Opanasenko ◽  
Dana Vitvarová
Keyword(s):  
Acidic Properties ◽  
Post Synthesis

scholarly journals Post-synthesis incorporation of Al into germanosilicate ITH zeolites: the influence of treatment conditions on the acidic properties and catalytic behavior in tetrahydropyranylation

2015 ◽  
Vol 5 (5) ◽  
pp. 2973-2984 ◽  
Author(s):  
Mariya V. Shamzhy ◽  
Maksym V. Opanasenko ◽  
Francisca S. de O. Ramos ◽  
Libor Brabec ◽  
Michal Horáček ◽  
...  
Keyword(s):  
Acidic Properties ◽  
Catalytic Behavior ◽  
Treatment Conditions ◽  
Post Synthesis

Tuning of acidity and porosity of ITH germanosilicates by post-synthesis alumination.

Characterization and acidic properties of Al-SBA-15 materials prepared by post-synthesis alumination of a low-cost ordered mesoporous silica

2007 ◽  
Vol 180 (3) ◽  
pp. 1130-1140 ◽  
Author(s):  
M. Gómez-Cazalilla ◽  
J.M. Mérida-Robles ◽  
A. Gurbani ◽  
E. Rodríguez-Castellón ◽  
A. Jiménez-López
Keyword(s):  
Mesoporous Silica ◽  
Low Cost ◽  
Ordered Mesoporous Silica ◽  
Acidic Properties ◽  
Ordered Mesoporous ◽  
Post Synthesis

scholarly journals Renewable glycerol esterification over sulfonic-modified mesoporous silicas

2018 ◽  
Vol 83 (1) ◽  
pp. 39-50 ◽  
Author(s):  
Margarita Popova ◽  
Hristina Lazarova ◽  
Agnes Szegedi ◽  
Magdolna Mihályi ◽  
Мojca Rangus ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Solid State Nmr ◽  
Value Added ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Gravimetric Analysis ◽  
Acidic Properties ◽  
X Ray ◽  
Post Synthesis ◽  
Glycerol Esterification

SO3H-functionalised mesoporous materials with different pore structures (SBA-15 and SBA-16) were prepared by the post-synthesis surface modification. The materials were thoroughly characterized by X-ray powder diffraction, nitrogen physisorption, temperature-gravimetric analysis, elemental analysis and solid state NMR spectroscopy. The acidic properties were investigated by the temperature-programed desorption of ammonia. The catalytic performance of SO3H-functionalised mesoporous materials was studied in glycerol esterification with acetic acid.The different amount of silanol groups in the initial SBA-15 and SBA-16 silicas predetermined the different amount of propylsulfonic groups which are formed in them and therefore significantly influenced the acidity and the catalytic performance in glycerol esterification. Much higher amount of Br?nsted acid sites was generated in SO3H modified SBA-15 catalyst, which exhibited higher activity to value-added triacetyl glycerol.

Post-synthesis of biomimetic chitosan with honeycomb-like structure for sensitive recognition of phosphorylated peptides

2021 ◽  
Vol 1643 ◽  
pp. 462072
Author(s):  
Canhong Zhu ◽  
Jiani Wu ◽  
Xueting Jin ◽  
Yinghua Yan ◽  
Chuan-Fan Ding ◽  
...  
Keyword(s):  
Phosphorylated Peptides ◽  
Post Synthesis

scholarly journals Post-Synthesis Modification of Photoluminescent and Electrochemiluminescent Au Nanoclusters with Dopamine

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 46
Author(s):  
Jae Hyun Kim ◽  
Joohoon Kim
Keyword(s):  
Near Infrared ◽  
Au Nanoclusters ◽  
Metallic Core ◽  
Thiolate Ligand ◽  
Pl Intensity ◽  
Post Synthesis

Here, we report a post-synthesis functionalization of the shell of Au nanoclusters (NCs) synthesized using glutathione as a thiolate ligand. The as-synthesized Au NCs are subjected to the post-synthesis functionalization via amidic coupling of dopamine on the cluster shell to tailor photoluminescence (PL) and electrochemiluminescence (ECL) features of the Au NCs. Because the NCs’ PL at ca. 610 nm is primarily ascribed to the Au(I)-thiolate (SG) motifs on the cluster shell of the NCs, the post-synthesis functionalization of the cluster shell enhanced the PL intensity of the Au NCs via rigidification of the cluster shell. In contrast to the PL enhancement, the post-synthesis modification of the cluster shell does not enhance the near-infrared (NIR) ECL of the NCs because the NIR ECL at ca. 800 nm is ascribed to the Au(0)-SG motifs in the metallic core of the NCs.

scholarly journals Application of microwave radiation in the grafting of acidic sites on SBA-15 type material

2021 ◽  
Author(s):  
Maciej Trejda ◽  
Magdalena Drobnik ◽  
Ardian Nurwita
Keyword(s):  
Microwave Radiation ◽  
Thermal Analyses ◽  
Conventional Heating ◽  
Material Surface ◽  
Test Reaction ◽  
Study Materials ◽  
Mesoporous Support ◽  
Acidic Sites ◽  
Post Synthesis ◽  
Adsorption Desorption

AbstractMesoporous silica of SBA-15 type was modified for the first time with 3-(trihydroxysiyl)-1-propanesulfonic acid (TPS) by post-synthesis modification involving microwave or conventional heating in order to generate the Brønsted acidic centers on the material surface. The samples structure and composition were examined by low temperature N2 adsorption/desorption, XRD, HRTEM, elemental and thermal analyses. The surface properties were evaluated by esterification of acetic acid with n-hexanol used as the test reaction. A much higher efficiency of TPS species incorporation was reached with the application of microwave radiation for 1 h than conventional modification for 24 h. It was found that the structure of mesoporous support was preserved after modification using both methods applied in this study. Materials obtained with the use of microwave radiation showed a superior catalytic activity and high stability.

Efficiency of ethanol conversion induced by controlled modification of pore structure and acidic properties of alumina catalysts

2011 ◽  
Vol 398 (1-2) ◽  
pp. 59-65 ◽  
Author(s):  
Leandro Martins ◽  
Dilson Cardoso ◽  
Peter Hammer ◽  
Teresita Garetto ◽  
Sandra H. Pulcinelli ◽  
...  
Keyword(s):  
Pore Structure ◽  
Ethanol Conversion ◽  
Acidic Properties ◽  
Alumina Catalysts
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