STUDY ON EFFECT OF MODIFICATION WITH BORON ION ON CATALYTIC PROPERTY OF [B] ZSM-5 ZEOLITE CATALYST

A series of [B] ZSM-5 zeolite catalysts modified with B3+ have been prepared in this paper and studied for catalytic property in toluene/ethene alkylation reaction. Acidity of the modified catalysts was determined through three methods including TPD, IR and Hammett. The analytical results indicated that after boron had gone into the catalyst channel, the channel and pores were partly blocked by boron oxide and acidity of the modified catalysts have been changed. The results of toluene/ethene alkylation reaction on the modified [B] ZSM-5 zeolite with boron showed that selectivity of p-ethyltoluene reached 96.80% when its catalytic activity was 22.92%. Moreover, the stability of the modified catalyst was also satisfactory.