APXPS Study of Thermal Decomposition of Acetic Acid on Pd(111) by Hoan Nguyen | thermal decomposition คือ

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APXPS Study of Thermal Decomposition of Acetic Acid on Pd(111) by Hoan Nguyen


นอกจากการดูบทความนี้แล้ว คุณยังสามารถดูข้อมูลที่เป็นประโยชน์อื่นๆ อีกมากมายที่เราให้ไว้ที่นี่: ดูเพิ่มเติม

Acetic acid decomposition over Pd(111) is a good model for the decomposition of fatty acids and other
oxygenates involved in biofuel production. Our previous density functional theory (DFT) studies on the
thermal decomposition of acetic acid on Pd(111) suggested that carbon monoxide (CO) and carbon dioxide
(CO2), are produced by two different reaction pathways: decarbonylation (DCN), and decarboxylation
(DCX), respectively. Without water, the DCX, producing CO2, is slightly favored over the DCN pathway
but in the presence of water, that shifts to mostly CO2. To further understand these reaction mechanisms,
we have studied this model system using ambient pressure Xray photoelectron spectroscopy (APXPS)
and mass spectrometry (MS). APXPS allowed us to identify adsorbed reaction intermediates when dosing
acetic acid on clean Pd(111), including surface carbon, adsorbed CO, and acetate species. In order to
confirm our DFT results, we introduced a 1:1 mixture of water and acetic acid at various pressures and
temperatures. When exposing Pd(111) to acetic acid at 300K and range of pressures from 0.001 mbar to 1
mbar, the CO2:CO mass peak ratios increased from 1.22 to 2.11. This mass peak ratio also increases from
2.11 to 2.82 in the presence of water at 1 mbar, which suggests that more of CO2 is being produced in the
presence of water. APXPS data shows an increase in relative area of CO when coadsorbed water is present
(2.3% to 6.1%, at 1mbar, 300K), suggesting an increase in reactivity. These preliminary studies suggest an
enhancement in both of pathways with the addition to water based on the XPS and MS data. Future
experiments include lower pressures to separate the contribution of gas phase from the surface reaction as
well as varied temperatures.

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APXPS Study of Thermal Decomposition of Acetic Acid on Pd(111) by Hoan Nguyen

Lead Nitrate Heating | Decomposition of Lead nitrate


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leadnitrate
thermaldecompositionreaction

Lead Nitrate Heating | Decomposition of Lead nitrate

Thermal decomposition


Calcium carbonate decomposing over a Bunsen and some boring waffle.
Might be useful for 13+ Common Entrance, KS3, or possibly GCSE.

Thermal decomposition

Hawking Radiation and Black Holes| The theory that changed physics and our point of view.


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Hawking Radiation and Black Holes| The theory that changed physics and our point of view.

Making and playing with copper nitrate


In this Video I make some copper(II) nitrate by dissolving copper wire in nitric acid. I then conduct a few experiments with the newly created Cu(NO3)2. The Copper nitrate will be used to make some copper complexes in the near future.
I hope it’s interesting.

Making and playing with copper nitrate

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