A process for producing xylene comprising: a. contacting in a first reaction zone of a reactor a C 9 + aromatic feedstock, hydrogen and a C 6 - C 7 aromatic feedstock, toluene constituting from 10 to 90 wt.% of the entire feed, with a first catalyst comprising 0.01 to 5 wt.% of Pt and ZSM-5 under first conditions to form a first product, wherein said first conditions are selected such that said first product is substantially free of olefinic components and said first product contains at least 50 wt.% less ethyl-aromatic compounds and at least 75 wt.% less propyl-aromatic compounds than the C 9 + aromatic feedstock, wherein said first conditions comprise a temperature in the range of 100°C to 1000°C, a pressure in the range of 790 - 7000 kPa-a, a H2:HC molar ratio in the range of 0.01 to 20, a WHSV in the range of 0.01 to 100 hr -1; then b. contacting in a second reaction zone, located in the same or another reactor, at least a portion of said first product with a second catalyst comprising 0.01 to 5 wt.% of Pt and ZSM-12 under second conditions, wherein said second conditions are sufficient to transalkylate at least a portion of the C 9 + aromatic compounds in said C 9 + aromatic feedstock with at least a portion of the C 6 - C 7 aromatic compounds in said C 6 - C 7 aromatic feedstock to form a second product comprising xylene, wherein said second conditions are selected such that said second product is substantially free of olefinic components and a xylene yield is in the range of 20 to 50 wt.%, and wherein said second product contains at least 60 wt.%, preferably at least 65 wt.%, still more preferably at least 70 wt.% less ethyl-aromatic compounds and at least 70 wt.%, preferably at least 75 wt.%, still more preferably at least 85 wt.% less propyl-aromatic compounds than the C 9 + aromatic feedstock, wherein said second conditions comprise a temperature in the range of 100°C to 1000°C, a pressure in the range of 790 - 7000 kPa-a, a H2:HC molar ratio in the range of 0.01 to 20, a WHSV in the range of 0.01 to 100 hr -1, wherein the weight ratio of said first catalyst over said second catalyst is in the range of 5:95 to 75:25; and c. recovering said xylene. a. contacting in a first reaction zone of a reactor a C 9 + aromatic feedstock, hydrogen and a C 6 - C 7 aromatic feedstock, toluene constituting from 10 to 90 wt.% of the entire feed, with a first catalyst comprising 0.01 to 5 wt.% of Pt and ZSM-5 under first conditions to form a first product, wherein said first conditions are selected such that said first product is substantially free of olefinic components and said first product contains at least 50 wt.% less ethyl-aromatic compounds and at least 75 wt.% less propyl-aromatic compounds than the C 9 + aromatic feedstock, wherein said first conditions comprise a temperature in the range of 100°C to 1000°C, a pressure in the range of 790 - 7000 kPa-a, a H2:HC molar ratio in the range of 0.01 to 20, a WHSV in the range of 0.01 to 100 hr -1; then b. contacting in a second reaction zone, located in the same or another reactor, at least a portion of said first product with a second catalyst comprising 0.01 to 5 wt.% of Pt and ZSM-12 under second conditions, wherein said second conditions are sufficient to transalkylate at least a portion of the C 9 + aromatic compounds in said C 9 + aromatic feedstock with at least a portion of the C 6 - C 7 aromatic compounds in said C 6 - C 7 aromatic feedstock to form a second product comprising xylene, wherein said second conditions are selected such that said second product is substantially free of olefinic components and a xylene yield is in the range of 20 to 50 wt.%, and wherein said second product contains at least 60 wt.%, preferably at least 65 wt.%, still more preferably at least 70 wt.% less ethyl-aromatic compounds and at least 70 wt.%, preferably at least 75 wt.%, still more preferably at least 85 wt.% less propyl-aromatic compounds than the C 9 + aromatic feedstock, wherein said second conditions comprise a temperature in the range of 100°C to 1000°C, a pressure in the range of 790 - 7000 kPa-a, a H2:HC molar ratio in the range of 0.01 to 20, a WHSV in the range of 0.01 to 100 hr -1, wherein the weight ratio of said first catalyst over said second catalyst is in the range of 5:95 to 75:25; and c. recovering said xylene.