Abstract
On microporous micron HZSM-5 catalyst liquefied petroleum gas (LPG) tends to produce high heavier hydrocarbons (HCs) and methane. Here nano HZSM-5 with regular pores by recrystallization procedure was investigated for the selective transformation of LPG. HZSM-5 with different crystallite aggregation, mesopore property and acidity was synthesized. Mesopore-connected, micropore-shortened and weakly acidic HZSM-5 catalyst enhances remarkably the formation of light olefins from LPG. At reaction temperature of 600 °C and contact time (W/F) of 15 g·h/mol, the selectivity of propylene and ethylene reached 68.3% at the total conversion of LPG of 58.8%. Products of C5+ HCs and methane were reduced. Due to less diffusion resistance of synthetic HZSM-5 and its low Brönsted acid amount as well as low total acid amount, adverse side reactions are suppressed.
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