Hierarchical composite catalysts of MCM-41 on zeolite Beta for conversion of heavy reformate to xylenes

•Hierarchical composites of MCM-41 on zeolite Beta were synthesized.•Mesophase and bimodal pore structure transformed into ordered/disordered structure.•Incorporation of well-dispersed Mo was advantageous in improving catalyst performance.•Optimization of bimodal pore structure by strength of NaOH in zeolite disintegration.•1.7 times increase in xylene selectivity was achieved compared to zeolite Beta.