Obstruction by CO of the decomposition of methanol on Pt nanoclusters on a thin film of Al2O3/NiAl(100)

Dependence on Size of Supported Rh Nanoclusters in the Dehydrogenation of Methanol-d4 Obstructed by CO

“…This condition implies that the D atoms, which were produced above 150 K, , diffused easily to preferential sites to desorb associatively; CO ad altered little the diffusion and desorption of D atoms. A similar property was observed on supported Pt clusters . The CO spectra (Figures a and b) show a similar trend; the three CO lines overlap to a large extent at the high-temperature sides (≥450 K).…”

“…Understanding how CO inhibits or alters the reaction thus becomes critical. Model systems, such as a single crystal, − alloy, − and oxide surfaces, − have been extensively applied to attain a mechanistic understanding of the decomposition of methanol, whereas the poisoning by CO of the reaction is little illuminated. ,, Authors of previous studies on single crystal surfaces proposed that adsorbed CO inhibits the reaction through blocking the reactive sites or ensembles on surfaces. ,, Such site blocking could decrease the number of methanol molecules interacting with catalyst surfaces and/or deactivate the catalyst; the deactivation could also arise from not only the direct occupation of reactive sites but also a modification of the surface electronic structures. Detailed mechanisms on the site-blocking effect remain lacking.…”

Composition-Tuned Pt-Skinned PtNi Bimetallic Clusters as Highly Efficient Methanol Dehydrogenation Catalysts

“…1,2 Although platinum is widely used as (electro)catalyst in the dehydrogenation of methanol (CH3OH), 3,4 its performance is limited by its modest stability and selectivity. [5][6][7] The three main drawbacks of platinum-based anode catalysts are their high cost as methanol bonds breaking requires large amounts of catalyst, 8 their low selectivity to generate hydrogen as end product, and their low stability in presence of carbon monoxide, a by-product of methanol dissociation (i.e. the CO poisoning effect).…”

“…9,10 These crucial challenges require remediation in order to design future high performance fuel cell catalysts, for which fundamental understanding of the reaction kinetics at the atomic and molecular level are required. For this purpose, the reaction kinetics of model catalyst systems such as single Pt atoms, 11 Pt single crystals, [12][13][14] oxide-supported Pt thin films, 15 and Pt nanoparticles, 6,7 have been investigated intensively.…”

Recent Advances in the Synthesis, Properties, and Biological Applications of Platinum Nanoclusters

“…Even the amount of Pt was quite small, the electrocatalytical activity was improved dramatically and the ampere-metric determination limit of sodium nitrite (NaNO 2 ) was 0.067 μM (S/N = 3). On the other hand, a doped substrate method is allowing Pt NCs doped or dispersed into the substrate materials such as polymer film [89][90][91][92], inorganic substrate [93][94][95][96], metal organic framework (MOF) [97], carbon nanotubes (CNTs) [98,99], and graphene [100][101][102], which could easily adjust and enhance the pure NCs' chemical and physical performance. Pt NCs with an average diameter of 0 7 ± 0 3 nm were deposited on SmMn 2 O 5 (SMO) mullite-type oxides by an atomic layer deposition method (ALD), showing the efficient ability to solve the CO poisoning problem for the Pt-based catalyst [103].…”