| from the reaction chamber | 8 | other |
| from the regenerator | 7 | other |
| by washing with aqueous phosphoric acid | 4 | manner |
| catalyst → be → removed | 37 |
| catalyst → be → withdrawn | 3 |
| negative | neutral | positive |
| 0.150 | 0.753 | 0.097 |
| Raw frequency | 40 |
| Normalized frequency | 0.606 |
| Modifier score | 0.825 |
| Perplexity | 418.093 |