We disclose a method for converting toluene to xylenes, comprising
contacting toluene with methanol in the presence of a silica-bound HZSM-5
catalyst. As an example, in one embodiment the method can include: (i)
first silylating HZSM-5, to form silylated HZSM-5; (ii) first calcining
the silylated HZSM-5, to form calcined silylated HZSM-5; (iii) binding
the calcined silylated HZSM-5 to silica, to form silica-bound calcined
silylated HZSM-5; (iv) extruding the silica-bound calcined silylated
HZSM-5, to form extruded silica-bound calcined silylated HZSM-5; (v)
second calcining the extruded silica-bound calcined silylated HZSM-5, to
form extruded silica-bound twice-calcined silylated HZSM-5; (vi) second
silylating the extruded silica-bound twice-calcined silylated HZSM-5, to
form extruded silica-bound twice-calcined twice-silylated HZSM-5; and
(vii) third calcining the extruded silica-bound twice-calcined
twice-silylated HZSM-5, to form the silica-bound HZSM-5 catalyst.