Abstract
We have performed a number of quantum chemical simulations to examine the reduction process of methanol in hot water. Methanol is converted into a methane by capturing a hydrogen molecule and leaving a water molecule behind. The required energy for the reduction is too high to proceed in the gas phase. The energy barrier for the reduction of methanol is reduced by the catalytic effect of water molecules when we consider the reduction in aqueous solution. However, the calculated reduction rate is still much slower than that found experimentally. The ion product of water tends to increase in hot water, even though it eventually decreases at the high temperature of supercritical water. It is valuable to consider the acid-base catalytic effects on the reduction of methanol in hot water. The significant reduction of the energy barrier is accomplished by the acid-base catalytic effects due to hydronium or hydroxyde. Mean collision time between a hydronium and a methanol in hot water is shorter than the reduction time, during which a methanol is converted into a methane. The calculated reduction rate with the acid-base catalytic effects agrees well with that determined by laboratory experiments. The present study reveals a crucial role of the acid-base catalytic effects on reactions in hot water.
| Original language | English |
|---|---|
| Article number | 373 |
| Journal | Catalysts |
| Volume | 9 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2019 Apr 1 |
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Keywords
- Acid-base
- Hot water
- Methane
- Methanol
- Reaction rate
ASJC Scopus subject areas
- Catalysis
- Physical and Theoretical Chemistry
Cite this
Acid-base catalytic effects on reduction of methanol in hot water. / Inaba, Satoshi.
In: Catalysts, Vol. 9, No. 4, 373, 01.04.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Acid-base catalytic effects on reduction of methanol in hot water
AU - Inaba, Satoshi
PY - 2019/4/1
Y1 - 2019/4/1
N2 - We have performed a number of quantum chemical simulations to examine the reduction process of methanol in hot water. Methanol is converted into a methane by capturing a hydrogen molecule and leaving a water molecule behind. The required energy for the reduction is too high to proceed in the gas phase. The energy barrier for the reduction of methanol is reduced by the catalytic effect of water molecules when we consider the reduction in aqueous solution. However, the calculated reduction rate is still much slower than that found experimentally. The ion product of water tends to increase in hot water, even though it eventually decreases at the high temperature of supercritical water. It is valuable to consider the acid-base catalytic effects on the reduction of methanol in hot water. The significant reduction of the energy barrier is accomplished by the acid-base catalytic effects due to hydronium or hydroxyde. Mean collision time between a hydronium and a methanol in hot water is shorter than the reduction time, during which a methanol is converted into a methane. The calculated reduction rate with the acid-base catalytic effects agrees well with that determined by laboratory experiments. The present study reveals a crucial role of the acid-base catalytic effects on reactions in hot water.
AB - We have performed a number of quantum chemical simulations to examine the reduction process of methanol in hot water. Methanol is converted into a methane by capturing a hydrogen molecule and leaving a water molecule behind. The required energy for the reduction is too high to proceed in the gas phase. The energy barrier for the reduction of methanol is reduced by the catalytic effect of water molecules when we consider the reduction in aqueous solution. However, the calculated reduction rate is still much slower than that found experimentally. The ion product of water tends to increase in hot water, even though it eventually decreases at the high temperature of supercritical water. It is valuable to consider the acid-base catalytic effects on the reduction of methanol in hot water. The significant reduction of the energy barrier is accomplished by the acid-base catalytic effects due to hydronium or hydroxyde. Mean collision time between a hydronium and a methanol in hot water is shorter than the reduction time, during which a methanol is converted into a methane. The calculated reduction rate with the acid-base catalytic effects agrees well with that determined by laboratory experiments. The present study reveals a crucial role of the acid-base catalytic effects on reactions in hot water.
KW - Acid-base
KW - Hot water
KW - Methane
KW - Methanol
KW - Reaction rate
UR - http://www.scopus.com/inward/record.url?scp=85065720082&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85065720082&partnerID=8YFLogxK
U2 - 10.3390/catal9040373
DO - 10.3390/catal9040373
M3 - Article
VL - 9
JO - Catalysts
JF - Catalysts
SN - 2073-4344
IS - 4
M1 - 373
ER -