Hydrogen spillover through a gas phase

Razzhivina, I. A.; Badun, G. A.; Chernysheva, Maria G.; Гаршев, А.В.; Shevchenko, V. P.; Шевченко, К. В.; Nagaev, I. Yu.; Щепина, Н. Е.

doi:10.1016/j.mencom.2016.01.023

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…1094 The effect of temperature is also important and it has been shown that spillover is increased with increasing temperature from 273 to 353 K. 1103 Beside the diffusion of hydrogen on the surface of the support, hydrogen spillover through the gas phase was also evidenced experimentally. 1104,1105 Primary (between the metal and a first carbon material) and secondary (between the first carbon material and a second carbon material) spillover through a carbon bridge (formed with the addition of sucrose) was reported by Yang et al (Figure 47a). 1106,1107 This finding has to be related to the early works of Boudart, which have highlighted the importance of "carbon contaminants" on the platinum surface that provide bridges permitting surface diffusion of hydrogen atoms from Pt to the carbon support.…”

Section: Hydrogen Spillovermentioning

confidence: 83%

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

2019

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Fermi level in vii) are shown in purple in ii)-vi) with an iso-value of ±0.003 a.u. Reprinted with permission from ref 57 . Copyright 2014 from the Royal Society of Chemistry; b) Molecular model of a corannulene-like element functionalized with three carboxylic groups from two different perspectives in the cpk representation (on the left). The final structure (190 elements in a cubic cell of 60 Å in size) obtained from random packing of the individual elements (on the right). Cyan: carbon, red: oxygen, white: hydrogen. Reprinted with permission from ref 59 Copyright 2017 from Elsevier; c) Side-views of Ru13 adsorbed on Gr-DV-2COOH site before (on left panel) and after a proton jump (right panel). C atoms are in black, O in red, H in with white and Ru in mocha. Reprinted with permission from ref 60 Copyright 2014 from Elsevier; and d) Spin-density projection in µB/a.u. 2 on the graphene plane around i) the hydrogen chemisorption defect (∆) and ii) the vacancy defect in the a sublattice. Carbon atoms corresponding to the a sublattice (o) and to the b sublattice (•) are distinguished. Simulated STM images of the defects are shown in iii) and iv), respectively. Reprinted with permission from ref 61 .

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Section: Hydrogen Spillovermentioning

confidence: 83%

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

2019

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“…The contact between the two supports is actually not necessary since gas phase hydrogen spillover can occur [66][67][68][89][90][91]. Even if thermodynamically the gas phase H spillover concentration should be very low [92], it should permit a fast formation of H species adsorbed on the support.…”

Section: H2-tpd Experiments and Catalytic Tests To Assess Hydrogen Spillovermentioning

confidence: 99%

Origin of the synergistic effect between TiO2 crystalline phases in the Ni/TiO2-catalyzed CO2 methanation reaction

Messou

Bernardin

Meunier

et al. 2021

Journal of Catalysis

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“…COOH species is thermal instable. Even if there is no reductive gas, as long as sufficient energy is provided, it will decompose to CO 2 [3c,e,14b,16] and be eliminated from the surface of porous carbons. Thus, in Figure 6b, scarcely any COOH content difference appears between hydrogen spillover and H 2 reduction.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Spillover Facilitating Reduction of Surface Oxygen Species on Porous Carbon

et al. 2021

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Surface oxygen‐containing functional groups of porous carbon have great influence on its various properties, including the catalytic performance, chemical stability, and adsorption capacity. In this paper, a catalytic hydrogen spillover method was proposed to prepare porous carbons with low oxygen content in 7 vol % H2/Ar atmosphere. Pt/C was used as the catalyst. Petroleum coke‐based porous carbon was adopted as the model material to study hydrogen spillover reduction effect within the temperature range of 500–700 °C. XRD, Raman and XPS were used to characterize the microstructures and surface chemical composition of prepared materials. Compared with H2 reduction, hydrogen spillover reduction can further increase graphitic degree of porous carbon without destroying the morphology and pore structure, and can reduce the contents of surface oxygen‐containing groups of porous carbon more effectively. And among different kinds of oxygen‐containing groups, the more reactive hydrogen atoms dissociated by Pt/C catalyst have the best reduction effect on C−O species.

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Hydrogen spillover through a gas phase

Cited by 8 publications

References 12 publications

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

Origin of the synergistic effect between TiO2 crystalline phases in the Ni/TiO2-catalyzed CO2 methanation reaction

Hydrogen Spillover Facilitating Reduction of Surface Oxygen Species on Porous Carbon

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