Table 2.

Conversion and product selectivity in MTO reaction with and without H¹³CHO^a

Feed composition	MeOH	MeOH + 5 C% H13CHO
Conversion (C%)	88.8	75.8
Product selectivity (C%)
Ethene	3.0	8.6
Propene	36.9	28.1
Butene	20.3	15.8
Dienesb	0.4	0.7
Aromatics	2.4	12.2
C1-4 alkanes	3.1	2.8
C5+ aliphatics	20.2	20.1

^aReaction conditions: H-ZSM-5 (Si/Al 90 steamed), W/F 1.82 h·g_cat·mol_(MeOH+HCHO)⁻¹, MeOH 180 mbar, H₂O 60 mbar, or MeOH 171 mbar, H¹³CHO 9 mbar, H₂O 60 mbar, 475 °C

^bButadiene and pentadiene