Table 1. One-pass selective conversion of syngas to PX over the hybrid catalysts a .
| Catalysts | Conv. (%) | Selectivity
b
(%) |
||||||
| CO | MeOH + DME | CH4 | C2–C5 | OX | MX | PX | PX/X c (%) | |
| Cr/Zn | 27.5 | 54.1 | 30.4 | 14.0 | 0 | 0 | 0 | — |
| Cr/Zn–Z5 | 61.0 | 0 | 2.4 | 41.4 | 6.1 | 0.1 | 10.5 | 62.9 |
| Cr/Zn–Z5@S1 | 55.2 | 0 | 2.4 | 44.5 | 4.9 | 0.3 | 13.0 | 71.4 |
| Cr/Zn–Zn/Z5 | 66.4 | 0 | 3.2 | 38.5 | 3.9 | 0.3 | 12.4 | 74.7 |
| Cr/Zn–Zn/Z5@S1 hybrid | 55.0 | 0 | 4.4 | 33.6 | 8.1 | 0 | 27.6 | 77.3 |
| Cr/Zn + Zn/Z5@S1 dual-layer | 34.5 | 0.3 | 26.8 | 59.1 | 0.7 | 0 | 2.1 | 75.0 |
| Cr/Zn + Zn/Z5@S1 granule mixture | 50.4 | 0.1 | 7.2 | 66.6 | 1.7 | 0 | 5.2 | 75.4 |
aReaction conditions: 5.0 MPa, 673 K, W/F = 20.7 g h mol–1, syngas : H2/CO = 2.1, 4 h, hybrid catalysts 0.5 g (Cr/Zn : zeolite = 2).
bThe selectivity of C2–C5, OX, MX, and PX in all of the products, C2–C5 including paraffins and olefins, OX = ortho-xylene, MX = meta-xylene, PX = para-xylene.
cPX/X: the ratio of PX to all xylene.