Copper-manganese catalysts with high activity for methanol synthesis

Blanco, Humberto; Lima, Stevie H.; Rodrigues, Victor de O.; Palacio, Luz Amparo; Faro, Arnaldo C.

doi:10.1016/j.apcata.2019.04.021

Cited by 12 publications

(4 citation statements)

References 47 publications

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“…There are also hints that MnO x might increase the thermal stability of Cu nanoparticles, [28] but its effect appears to be less pronounced than for a ZnO x promoter [32,33] and mechanistic details remain unclear. There are still many open questions as other reports suggest the absence of any electronic promotion of Cu nanoparticles by MnO x [34] or that not the selectivity to methanol but to CO increased upon MnO x addition [32]…”

Section: Introductionmentioning

confidence: 99%

“…[20] There are also hints that MnO x might increase the thermal stability of Cu nanoparticles, [28] but its effect appears to be less pronounced than for a ZnO x promoter[ 32 , 33 ] and mechanistic details remain unclear. There are still many open questions as other reports suggest the absence of any electronic promotion of Cu nanoparticles by MnO x [34] or that not the selectivity to methanol but to CO increased upon MnO x addition. [32]…”

Section: Introductionmentioning

confidence: 99%

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Manganese Oxide as a Promoter for Copper Catalysts in CO₂ and CO Hydrogenation

et al. 2022

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In this work, we discuss the role of manganese oxide as a promoter in Cu catalysts supported on graphitic carbon during hydrogenation of CO2 and CO. MnOx is a selectivity modifier in an H2/CO2 feed and is a highly effective activity promoter in an H2/CO feed. Interestingly, the presence of MnOx suppresses the methanol formation from CO2 (TOF of 0.7 ⋅ 10−3 s−1 at 533 K and 40 bar) and enhances the low‐temperature reverse water‐gas shift reaction (TOF of 5.7 ⋅ 10−3 s−1) with a selectivity to CO of 87 %C. Using time‐resolved XAS at high temperatures and pressures, we find significant absorption of CO2 to the MnO, which is reversed if CO2 is removed from the feed. This work reveals fundamental differences in the promoting effect of MnOx and ZnOx and contributes to a better understanding of the role of reducible oxide promoters in Cu‐based hydrogenation catalysts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Manganese Oxide as a Promoter for Copper Catalysts in CO₂ and CO Hydrogenation

et al. 2022

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“…Cu-MnOx synergy 258 , or that not the methanol selectivity but the CO selectivity increased upon MnOx addition 256 . In chapter 4 we report the effects of the MnOx promoter on carbon-supported Cu catalysts in both CO and CO2 hydrogenation under relevant reaction conditions and describe the MnOx speciation during operation with operando XAS at high pressure and temperature.…”

Section: Manganese Oxide In Supported Copper Catalystsmentioning

confidence: 99%

“…There are also hints that MnOx might increase the thermal stability of Cu nanoparticles 330 , but its effect appears to be less pronounced than for a ZnOx promoter 256,257 and mechanistic details remain unclear. There are still many open questions as other reports suggest the absence of any electronic promotion of Cu nanoparticles by MnOx 258 or that not the selectivity to methanol but to CO increased upon MnOx addition 256 .…”

Section: Introductionmentioning

confidence: 97%

Copper Catalysts for Synthesis Gas Conversion - Promoter and Support Effects

Dalebout¹

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When someone has heard of a catalyst before, it has often been explained as a car part that cleans the exhaust gases. However, there are many more types of catalysts used in the industrial production of almost any chemical, ranging from enzymes (biocatalysis) for the production of medicines to solid catalysts for gasoline and plastics production. 1,2 A catalyst is in general a substance that is used to accelerate a chemical reaction from starting compound A to desired product B by lowering the activation barrier (figure 1.1A), while the substance itself is not consumed. 3 For example, inside the three-way catalytic converter in gasoline-type cars several catalyzed reactions simultaneously occur: hydrocarbons, carbon monoxide (CO), and nitrogen oxides (NOx) in the high exhaust stream are converted into the less harmful carbon dioxide (CO2), water (H2O), and nitrogen gas (N2). 4 Here, we focus on heterogeneous catalysts, which are solid catalysts used in liquid-or gas-phase reactions. The active compound in heterogeneous catalysts is often a metal (oxide or sulfide). Figure 1.1 (A) Energy diagram of a catalyzed and non-catalyzed chemical reaction with Eact representing the activation energy. (B) Transfer of electron density from the d-band of a metal to an anti-bonding orbital of a reactant (here σ* of an H2 molecule). Back-donation (as indicated by the arrow) induces bond breaking. Adapted from ref. [3]. (C) Different binding modes of a CO molecule on a metal surface. 493 60 2,000 b 12.4 50.7 42.6 6.3 [177] a N-C = ordered mesoporous nitrogen-doped carbon, KIT-6 = ordered mesoporous silica, last entry = physical mixture. b In mL gcat -1 h -1 . c C2+OH = higher alcohols, HC = hydrocarbons. d Without taking CO2 into account.

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Cu–Mn–Al based catalyst for the direct syngas to dimethyl ether conversion

Blanco,

Palacio,

Rodrigues

et al. 2024

Reac Kinet Mech Cat

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Copper-manganese catalysts with high activity for methanol synthesis

Cited by 12 publications

References 47 publications

Manganese Oxide as a Promoter for Copper Catalysts in CO₂ and CO Hydrogenation

Manganese Oxide as a Promoter for Copper Catalysts in CO₂ and CO Hydrogenation

Copper Catalysts for Synthesis Gas Conversion - Promoter and Support Effects

Cu–Mn–Al based catalyst for the direct syngas to dimethyl ether conversion

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Copper-manganese catalysts with high activity for methanol synthesis

Cited by 12 publications

References 47 publications

Manganese Oxide as a Promoter for Copper Catalysts in CO2 and CO Hydrogenation

Manganese Oxide as a Promoter for Copper Catalysts in CO2 and CO Hydrogenation

Copper Catalysts for Synthesis Gas Conversion - Promoter and Support Effects

Cu–Mn–Al based catalyst for the direct syngas to dimethyl ether conversion

Contact Info

Product

Resources

About

Manganese Oxide as a Promoter for Copper Catalysts in CO₂ and CO Hydrogenation

Manganese Oxide as a Promoter for Copper Catalysts in CO₂ and CO Hydrogenation