Reaction Mechanism and Kinetics for the Selective Hydrogenation of Carbon Dioxide to Formic Acid and Methanol over the [Cu2]0,±1 Dimer

被引:1
|
作者
Neog, Shilpa [1 ]
Dowerah, Dikshita [1 ]
Biswakarma, Nishant [1 ]
Dutta, Priyanka [1 ]
Churi, Partha Pratim [1 ,2 ]
Sarma, Plaban Jyoti [1 ,3 ]
Gour, Nand Kishor [1 ]
Deka, Ramesh Chandra [1 ]
机构
[1] Tezpur Univ, Dept Chem Sci, CMML Catalysis & Mol Modelling Lab, Napaam 784028, Assam, India
[2] Dergaon Kamal Dowerah Coll, Dept Chem, Dergaon 785614, Assam, India
[3] Gargaon Coll, Dept Chem, Sivsagar 785686, Assam, India
来源
JOURNAL OF PHYSICAL CHEMISTRY A | 2023年 / 127卷 / 41期
关键词
CO2; REDUCTION; COPPER DIMER; HOMOGENEOUS HYDROGENATION; METAL-OXIDE; CLUSTERS; CU-2; ELECTROREDUCTION; ELECTROCATALYST; ACTIVATION; CONVERSION;
D O I
10.1021/acs.jpca.3c03609
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
With the rapid growth of industrialization, deforestation, and burning of fossil fuels, undeniably there has been an incredible escalation of the CO2 concentration in the atmosphere. In order to mitigate the problem, the capture and utilization of CO2 in different value-added chemicals have thus remained topics of concerned research for more than a decade. Accordingly, we have performed molecular -level catalytic hydrogenation of CO2 to formic acid using bare [Cu-2](0,+/- 1) dimers as catalysts. The entire investigation has been performed using a density functional theory (DFT) method employing the Perdew-Burke-Ernzerhof (PBE) functional with the def2TZVPP basis set to explore the different possible routes and efficiency of the catalysts. Results reveal the feasibility of H-2 dissociation on all three Cu-2, Cu-2(+), and Cu-2(-) dimers. The negatively charged hydride formed during H-2 dissociation on Cu-2 and Cu-2(+) dimers facilitates the formation of the HCOO* intermediate over COOH*, thereby providing product selectivity for HCOOH above CO. However, the reaction on the Cu-2(-) dimer forms both HCOO* and COOH* intermediates, but HCOO*, being kinetically more favorable, results in HCOOH production. The free-energy change suggests that the complete reaction on Cu-2 and Cu-2(+) dimers forms a stable product compared to the Cu-2(-) dimer. Furthermore, H3COH production is studied using the title catalysts via the obtained HCOOH* intermediate from the reaction channel. Transition state theory (TST) has been considered to evaluate the rate constants for each step of the reaction. Overall results suggest Cu-2 to be better compared to Cu-2(+) and Cu-2(-) dimers for HCOOH formation and Cu-2(+) over Cu-2 and Cu-2(-) dimers to be more efficient for H3COH formation. This work opens the way for further investigation of the reaction mechanism and development of an efficient catalyst for CO2 hydrogenation.
引用
收藏
页码:8508 / 8529
页数:22
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