and hydrogen gases were collected in a sampling loop (1 mL) and
analyzed by an on-line gas chromatography (China GC 2000)
equipped with thermal conductivity detector (TCD) and molecular
sieve 5A packed column. The liquid products from the CO2-hydrogenation
compartment were sampled using a syringe (1-10 lL) for
offline analysis by another gas chromatography (China GC 2000)
system equipped with the flame ionization detector (FID), and
Porapak QS packed column.