Fabrication of Hollow Mesoporous Nanosized ZSM‐5 Catalyst with Superior Methanol‐to‐Hydrocarbons Performance by Controllable Desilication
Why this work is in the frame
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Bibliographic record
Abstract
Abstract This work aims to improve the catalyst lifetime of ZSM‐5 for the methanol‐to‐hydrocarbons conversion by tuning the pore structure and external surface area on nano‐ZSM‐5 (100 nm). Several differently pore‐structured samples were synthesized based on the controllable desilication of nano‐ZSM‐5 by prolonging the alkali‐treatment time and introducing tetrapropylammonium hydroxide (TPAOH) into NaOH solution. 2 h NaOH treatment produced mesoporous ZSM‐5 with well‐maintained interior, and the catalytic lifetime was prolonged from 60 to 127 h along with increased isoparaffins selectivity owing to improved diffusion and accessibility of internal weak acid sites. If prolonging the treating time to 15 h, nano‐ZSM‐5 with initially formed hollow structure (HI‐Z5) was achieved, which shows relatively short lifetime of 85 h and high aromatics selectivity. After a secondary treatment of HI‐Z5 with fresh NaOH solution for 5 h, the formed thin shell and clean interior significantly improved diffusion, and the lifetime increased from 85 to 115 h. The aromatics selectivity was also increased by the enhanced acidity. Mesopores were introduced into the shell of HI‐Z5 after treating it with a freshly mixed solution of NaOH and TPAOH. The external surface area exhibited a 94 % increase, resulting in a high isoparaffins selectivity and a long lifetime of 149 h.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it