Enhanced catalytic performance of α-MnO2 via coupling with a vacuum ultraviolet photoreactor: A catalytic ozonation approach targeting VOC oxidation
Bibliographic record
Abstract
The present work introduces a new air purification strategy that combines a vacuum ultraviolet (VUV) photoreactor as an in-situ source of O 3 generation coupled with a fixed-bed reactor equipped with α-MnO 2 -based catalysts for VOC oxidation at room temperature. The as-synthesized catalysts were characterized using XRD, BET, SEM, EDX, TEM, HRTEM, and XPS techniques. The results of activity tests showed that combining the VUV photoreactor with the fixed-bed reactor meaningfully improved not only the conversion of acetone but also enhanced the O 3 decomposition compared to the individual air treatment systems in that the acetone and O 3 conversion were each boosted to 100%. Particularly, by coupling two systems, in the presence of α-MnO 2, α-MnO 2 /TiO 2 , and α-MnO 2 /γ-Al 2 O 3 compared to the case where the catalyst was applied in the VUV photoreactor, acetone oxidation was increased from 61%, 68%, and 74% to 91%, 100%, and 100%, and O 3 conversion was enhanced from 47%, 54%, and 63% to 100%, respectively. While the inhibitory influence of relative humidity (RH) on α-MnO 2 -based catalyst activity using a fixed bed reactor was found, coupling with the VUV photoreactor led to preserving 100% conversion of acetone and O 3 even in the humid condition. Additionally, the in-situ regeneration capability, introduced to the air treatment system by integrating the VUV photoreactor with the traditional catalytic ozonation, increased the reusability of the catalyst with minimal activity decrease (less than 2%). The attained data showed that introducing supports (TiO 2 and/or γ-Al 2 O 3 ) improves the catalytic performance of bare α-MnO 2 in all catalytic reactor setups, particularly from 91% to 100%, and 100%, in the case of couple catalytic reactor. Finally, a mechanistic study was conducted, and electron paramagnetic resonance (EPR) data demonstrated the co-participation of.OH/.O2− radicals in acetone removal using the coupled catalytic system.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".