A method comprising: introducing a hydrocarbon feed stream to a first reactor operating under adiabatic naphtha reforming conditions, wherein the first reactor comprises a first naphtha reforming catalyst, and wherein the hydrocarbon feed stream comprises a convertible hydrocarbon; converting at least a portion of the convertible hydrocarbon in the hydrocarbon feed stream to an aromatic hydrocarbon in the first reactor to form a first reactor effluent; passing the first reactor effluent from the first reactor to a second reactor operating under isothermal naphtha reforming conditions, wherein the second reactor comprises a plurality of tubes disposed within a reactor furnace; and a second naphtha reforming catalyst, wherein particles of the second naphtha reforming catalyst are disposed within the plurality of tubes; wherein at least one tube of the plurality of tubes of the second reactor comprises a graded catalyst bed; wherein the catalyst bed is graded with respect to the catalyst particle size and/or catalyst activity; and wherein the first naphtha reforming catalyst and the second naphtha reforming catalyst are the same or different and a ratio of an amount of the first naphtha reforming catalyst in the first reactor to an amount of the second naphtha reforming catalyst in the second reactor is in the range of 1:2 to 1:10 by weight of fresh catalyst; heating the first reactor effluent within the reactor furnace; converting at least an additional portion of the convertible hydrocarbon in the first reactor effluent to an additional amount of the aromatic hydrocarbon in the second reactor to form a second reactor effluent; and recovering the second reactor effluent from the second reactor; wherein at least one tube of the plurality of tubes contains a plurality of catalyst zones. introducing a hydrocarbon feed stream to a first reactor operating under adiabatic naphtha reforming conditions, wherein the first reactor comprises a first naphtha reforming catalyst, and wherein the hydrocarbon feed stream comprises a convertible hydrocarbon; converting at least a portion of the convertible hydrocarbon in the hydrocarbon feed stream to an aromatic hydrocarbon in the first reactor to form a first reactor effluent; passing the first reactor effluent from the first reactor to a second reactor operating under isothermal naphtha reforming conditions, wherein the second reactor comprises a plurality of tubes disposed within a reactor furnace; and a second naphtha reforming catalyst, wherein particles of the second naphtha reforming catalyst are disposed within the plurality of tubes; wherein at least one tube of the plurality of tubes of the second reactor comprises a graded catalyst bed; wherein the catalyst bed is graded with respect to the catalyst particle size and/or catalyst activity; and wherein the first naphtha reforming catalyst and the second naphtha reforming catalyst are the same or different and a ratio of an amount of the first naphtha reforming catalyst in the first reactor to an amount of the second naphtha reforming catalyst in the second reactor is in the range of 1:2 to 1:10 by weight of fresh catalyst; heating the first reactor effluent within the reactor furnace; converting at least an additional portion of the convertible hydrocarbon in the first reactor effluent to an additional amount of the aromatic hydrocarbon in the second reactor to form a second reactor effluent; and recovering the second reactor effluent from the second reactor; wherein at least one tube of the plurality of tubes contains a plurality of catalyst zones. <EOS>