In situ spectroscopic studies on vapor phase catalytic decomposition of dimethyl oxalate

2017 ◽  
Vol 19 (11) ◽  
pp. 8034-8045 ◽  
Author(s):  
Shweta Hegde ◽  
Kalsang Tharpa ◽  
Satyanarayana Reddy Akuri ◽  
Rakesh K. ◽  
Ajay Kumar ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Catalytic Decomposition ◽  
Spectroscopic Studies ◽  
Hydroxyl Groups ◽  
Spectroscopic Measurements ◽  
Surface Hydroxyl ◽  
Dimethyl Oxalate ◽  
Catalytic Materials ◽  
Surface Hydroxyl Groups

Dimethyl oxalate (DMO) decomposition was investigated on various catalytic materials. In situ spectroscopic measurements revealed that DMO decomposition is observed more on acidic surfaces and is dependent on the presence of surface hydroxyl groups.

Dynamic Effects in CO Adsorption on Ru/ZSM-5. Part I: Oxidative Disruption of Ru

1992 ◽  
Vol 46 (8) ◽  
pp. 1279-1287 ◽  
Author(s):  
J. Y. Shen ◽  
A. Sayari ◽  
S. Kaliaguine
Keyword(s):  
Diffuse Reflectance ◽  
Direct Evidence ◽  
Co Adsorption ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Diffuse Reflectance Infrared Spectroscopy ◽  
Adsorption Of Co ◽  
Diffuse Reflectance Infrared

In situ diffuse reflectance infrared spectroscopy of CO adsorption on reduced Ru/ZSM-5 reveals that, under appropriate conditions, in addition to the linearly adsorbed CO on metallic Ru particles (at 2045 ± 10 cm−1), two multicarbonyls involving oxidized Ru can be generated. These multicarbonyl species are characterized by IR doublets at 2080 and 2138 cm−1 and at 2086 and 2150 cm−1, respectively. Direct evidence for the consumption of both types of the ZSM-5 surface hydroxyl groups (silanol and Brønsted) during the oxidative adsorption of CO has been obtained. Each of these two OH types is believed to be associated with one of the multicarbonyl species.

The synthesis and structure of silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complexes

1986 ◽  
Vol 51 (7) ◽  
pp. 1430-1438 ◽  
Author(s):  
Alena Reissová ◽  
Zdeněk Bastl ◽  
Martin Čapka
Keyword(s):  
Free Surface ◽  
Hydroxyl Groups ◽  
Titanium Complex ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Free Hydroxyl ◽  
Cyclopentadienyl Anion

The title complexes have been obtained by functionalization of silica with cyclopentadienylsilanes of the type Rx(CH3)3 - xSi(CH2)nC5H5 (x = 1-3, n = 0, 1, 3), trimethylsilylation of free surface hydroxyl groups, transformation of the bonded cyclopentadienyl group to the cyclopentadienyl anion, followed by coordination of (h5-cyclopentadienyl)trichlorotitanium. The effects of single steps of the above immobilization on texture of the support, the number of free hydroxyl groups, the coverage of the surface by cyclopentadienyl groups and the degree of their utilization in anchoring the titanium complex have been investigated. ESCA study has shown that the above anchoring leads to formation of the silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complex.

Controllable synthesis of phosphate-modified BiPO4 nanorods with high photocatalytic activity: surface hydroxyl groups concentrations effects

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 99712-99721 ◽  
Author(s):  
Yan Li ◽  
Yawen Wang ◽  
Yu Huang ◽  
Junji Cao ◽  
Wingkei Ho ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Photocatalytic Performance ◽  
High Photocatalytic Activity ◽  
Hydroxyl Groups ◽  
Controllable Synthesis ◽  
Surface Hydroxyl ◽  
Methylene Orange ◽  
Surface Hydroxyl Groups

Surface modification by phosphate efficiently improves the photocatalytic performance of BiPO4 for the degradation of methylene orange (MO), by enhancing the concentration of surface hydroxyl groups and improving its hydrophilicity.

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