Strong Impact of Platinum Surface Structure on Primary and Secondary Alcohol Oxidation during Electro-Oxidation of Glycerol

ACS Catalysis ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 4491-4500 ◽  
Author(s):  
Amanda C. Garcia ◽  
Manuel J. Kolb ◽  
Chris van Nierop y Sanchez ◽  
Jan Vos ◽  
Yuvraj Y. Birdja ◽  
...  
Keyword(s):  
Surface Structure ◽  
Secondary Alcohol ◽  
Alcohol Oxidation ◽  
Strong Impact ◽  
Platinum Surface ◽  
Electro Oxidation

Active sites and states in the heterogeneous catalysis of carbon–hydrogen bonds

2005 ◽  
Vol 363 (1829) ◽  
pp. 879-900 ◽  
Author(s):  
Gabor A Somorjai ◽  
Anderson L Marsh
Keyword(s):  
Surface Structure ◽  
Active Sites ◽  
High Pressures ◽  
Bond Activation ◽  
Co Adsorption ◽  
Molecular Rearrangement ◽  
Platinum Surface ◽  
Bond Dissociation ◽  
Surface Mobility ◽  
Structure Sensitive

C–H bond activation for several alkenes (ethylene, propylene, isobutene, cyclohexene and 1-hexene) and alkanes (methane, ethane, n -hexane, 2-methylpentane and 3-methylpentane) has been studied on the (111) crystal face of platinum as a function of temperature at low (<10 −6  Torr) and high (≥1 Torr) pressures in the absence and presence of hydrogen pressures (≥10 Torr). Sum frequency generation (SFG) vibrational spectroscopy has been used to characterize the adsorbate structures and high pressure scanning tunnelling microscopy (HP-STM) has been used to monitor their surface mobility under reaction conditions during hydrogenation, dehydrogenation and CO poisoning. C–H bond dissociation occurs at low temperatures, approximately 250 K, for all of these molecules, although only at high pressures for the weakly bound alkanes because of their low desorption temperatures. Bond dissociation is known to be surface structure sensitive and we find that it is also accompanied by the restructuring of the metal surface. The presence of hydrogen slows down dehydrogenation and for some of the molecules it influences the molecular rearrangement, thus altering reaction selectivity. Surface mobility of adsorbates is essential to produce catalytic activity. When surface diffusion is inhibited by CO adsorption, ordered surface structures form and the reaction is poisoned. Ethylene hydrogenation is surface structure insensitive, while cyclohexene hydrogenation and dehydrogenation are structure sensitive. n -Hexane and other C 6 alkanes form either upright or flat-lying molecules on the platinum surface which react to produce branched isomers or benzene, respectively.

Picolinoyl functionalized MOF ligands for an air-promoted secondary alcohol oxidation with CuBr

2017 ◽  
Vol 41 (11) ◽  
pp. 4400-4405 ◽  
Author(s):  
Xin Du ◽  
Yi Luan ◽  
Fengxia Yang ◽  
Daniele Ramella ◽  
Xin Shu
Keyword(s):  
Secondary Alcohol ◽  
Alcohol Oxidation

A novel Zr-derived pyridine MOF ligand was designed and synthesized for an efficient Cu(i)-catalyzed secondary alcohol oxidation.

Surface Structure of Pt-Modified Au Nanoparticles and Electrocatalytic Activity in Formic Acid Electro-Oxidation

2007 ◽  
Vol 111 (51) ◽  
pp. 19126-19133 ◽  
Author(s):  
In-Su Park ◽  
Kug-Seung Lee ◽  
Jong-Ho Choi ◽  
Hee-Young Park ◽  
Yung-Eun Sung
Keyword(s):  
Formic Acid ◽  
Surface Structure ◽  
Electrocatalytic Activity ◽  
Au Nanoparticles ◽  
Electro Oxidation

Surface Structure Dependent Electro-oxidation of Dimethyl Ether on Platinum Single-Crystal Electrodes

2007 ◽  
Vol 111 (51) ◽  
pp. 18836-18838 ◽  
Author(s):  
Yujin Tong ◽  
Leilei Lu ◽  
Yi Zhang ◽  
Yunzhi Gao ◽  
Geping Yin ◽  
...  
Keyword(s):  
Single Crystal ◽  
Surface Structure ◽  
Dimethyl Ether ◽  
Platinum Single Crystal ◽  
Electro Oxidation
Sign in / Sign up

Export Citation Format

Share Document