Naphtha, reforming process

Some of ihe carbon monoxide and hydrogen produced in ihe steam-naphtha reforming process react to form methane ... 

Sinclair-Baker A naphtha reforming process, catalyzed by platinum on alumina. See also reforming. 

The overall chemistry of the steam-naphtha reforming process may be represented by the following equations ... 

Powerforming a fixed-bed naphtha-reforming process using a regenerable platinum catalyst. 

In the naphtha reforming process, a bifunctional metal-acid catalyst is used. During the coinnercial operation, coke is deposited on both catalytic functions producing their deactivation (refs, 1-3). When activity and selectivity are decreased to values where the operation is not convenient from the economical... 

While natural or activated clay catalysts are no longer employed in the fixed-bed Houdry process, they are still widely used in the fluid process and to a considerable extent in the TCC process. A natural bauxite catalyst is employed in the fixed-bed cycloversion process, developed by the Phillips Petroleum Company. This process is of greater importance as a naphtha reforming process than as a catalytic cracking process. 

The ring-opening reaction of methylcyclopentane (Scheme 3) is the reverse reaction of the dehydrocyclization of methylpentanes (Scheme 2). Reactions of alkylcyclopentanes on supported and unsupported transition metal catalysts are also very important in naphtha reforming processes . ... 

Iranshahi D, Pourazadi E, Paymooni K, Bahmanpour AM, Rahimpour MR, Shariati A. Modeling of an axial flow, spherical packed-bed reactor for naphtha reforming process in the presence of the catalyst deactivation. International Journal of Hydrogen Energy 2010 35 12784-12799. 

Both dehydrogenation and dehydrocyclization are endothermic. If naphtha reforming is carried out adiabatically, the temperature will decrease as the reaction proceeds. Almost all commercial naphtha reforming processes employ a series of adiabatic reactors with interstage heating, as shown below. 

The use of hydrodesulfulization became more widespread as catalytic naphtha reforming processes were introduced. The operation of platinum catalysts needed an increasingly strict sulfur specification for the naphtha, and as a bonus, the cheap by-product hydrogen from the reforming process could be used to hydrotreat other refinery product streams. 

Platinum was not only the most active and selective Group-VIII metal for the naphtha reforming process, but was also more readily available and relatively less expensive than iridium or rhodium. 

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