Reaction mechanism of ethylene glycol decomposition on Pt model catalysts: A density functional theory study
Reaction mechanism of ethylene glycol decomposition on Pt model catalysts: A density functional theory study
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Pt模型催化剂上乙二醇分解的反应机理:密度泛函理论研究
DOI:
10.1016/j.apsusc.2016.07.025
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发表时间:
2016-12
影响因子:
6.7
通讯作者:
Guichang Wang
中科院分区:
文献类型:
--
作者:
Cunqin Lv;Bo Yang;Xianyong Pang;Guichang Wang
Understanding and controlling bond beak sequence is important in catalytic processes. The DFT-GGA method combined with slab model was performed to study the ethylene glycol decomposition on various Pt model catalysts such as close-packed Pt(111), stepped Pt(211) and a more open one, Pt(100). Calculation results show that the adsorption energies of ethylene glycol and other decomposition species depend on the coordination number of surface atom, that is, low coordination number correspond to high adsorption energy. Moreover, it was found that final products of ethylene glycol decomposition are CO and H2on all model catalysts, but the reaction mechanism varies: On Pt(111), the first step is Osingle bondH bond scission, followed by Csingle bondH bond cleavage, namely C2H6O2→ HOCH2CH2O + H → HOCH2CHO + 2H→ HOCH2CO +3H → OCH2CO + 4H → OCHCO + 5H → CO + HCO + 5H → 2CO + 6H→ 2CO + 3H2; On Pt(211) and Pt(100), however, it is a second Osingle bondH bond cleavage that follows the initial Osingle bondH bond scission, that is, C2H6O2→ HOCH2CH2O + H → OCH2CH2O + 2H → OCHCH2O + 3H → OCHCHO + 4H → 2HCO + 4H → 2CO + 6H → 2CO + 3H2on Pt(211), and C2H6O2→HOCH2CH2O+ H → OCH2CH2O + 2H→OCHCH2O+3H→OCCH2O+4H→CO+H2CO+4H→CO+HCO+5H→2CO+6H→2CO+3H2on Pt(100) For the catalytic order of ethylene glycol to form H2, it may be determined based on the rate-controlling step, and it is Pt(111) > Pt(211) > Pt(100).
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影响因子:
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作者:
Grimme, Stefan
通讯作者:
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影响因子:
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作者:
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