Abstract: A process for dispersing or dispersing relatively large crystallites of an agglomerated Group VIII noble metal species present on a porous inorganic support is disclosed. The process includes contacting the agglomerated noble metal species, e.g., palladium or platinum, present on the support, e.g., alumina, silica or a zeolite such as ZSM-5 from which at least a major portion of any extraneous matter such as coke or other residue has previously been removed, with nitric oxide (NO) alone or in admixture with a source of halogen such as Cl.sub.2 and thereafter removing sorbed nitrogen oxide(s) and halogen, if present. The thus treated metal-loaded catalyst demonstrates substantially increased benzene hydrogenation activity (BHA) compared to the same catalyst prior to treatment indicating significant dispersion/redispersion of the metal crystallites as smaller crystallites.

Abstract: The dehydrocyclization of a feed containing one or more acyclic hydrocarbons capable of undergoing ring closure to provide aromatic hydrocarbons is accomplished by contacting the feed under dehydrocyclization conditions with a zeolite L dehydrocyclization catalyst which is substantially free of zeolite T and which contains at least one Group VIII metal component, thereby converting at least a portion of the acyclic hydrocarbon content of the feed to aromatic compound(s). Use of the foregoing zeolite L dehydrocyclization catalyst has been found to result in less non-selective hydrocracking of naphtha range materials to gaseous hydrocarbons and greater conversion of low octane paraffins to high octane aromatics than that achieved with a zeolite L synthesized by a prior procedure which results in the co-production of zeolite T contaminant.

Abstract: A process for dispersing or redispersing relatively large crystallites of an agglomerated Group VIII noble metal species present on a porous inorganic support is disclosed. The process includes contacting the agglomerated noble metal species, e.g., palladium or platinum, present on the support, e.g., alumina, silica or a zeolite such as ZSM-5 from which at least a major portion of any extraneous matter such as coke or other residue has previously been removed, with nitric oxide (NO) alone or in admixture with a source of halogen such as Cl.sub.2 and thereafter removing sorbed nitrogen oxide(s). The thus treated metal-loaded catalyst demonstrates substantially increased benzene hydrogenation activity (BHA) compared to the same catalyst prior to treatment indicating significant dispersion/redispersion of the metal crystallities as smaller crystallities.

Abstract: Catalytic reformng of a naphtha feed to provide high octane aromatic components employs a low acidity refractory oxide-bound intermediate and/or large pore zeolite prepared with at least an extrusion-facilitating amount of low acidity refractory oxide in colloidal form and containing at least one metal species selected from the platinum group metals.

Abstract: A process is described for regenerating a coke-deactivated platinum-containing zeolite catalyst material, which includes oxidizing the deactivated catalyst material in the presence of water under conditions which do not cause significant agglomeration of the platinum on the catalyst.

Abstract: A catalytic dewaxing process is improved by the use of a mixed zeolite catalyst which combines the following components: a first zeolitic catalyst having a Constraint Index not less than 1, a second, different, catalytic component of specified characteristics, and a hydrogenation component. This process for preparing the catalyst is also disclosed. Examples of specific combinations of dewaxing catalysts include ZSM-5 and Dealuminized Y, ZSM-5 and ZSM-12, and ZSM-5 and TEA Mordenite.

Abstract: There is provided, in accordance with the present invention, a catalyst composition made up of a mixture of two components, one component comprising a minor proportion of platinum and rhenium on a support and the second component comprising a minor proportion of iridium and rhenium on a separate support. A process for reforming a charge stock, such as naphtha, utilizing such catalyst is also provided.

Abstract: There is provided, in accordance with the present invention, a catalyst composition made up of a mixture of two components, one component comprising a minor proportion of platinum and rhenium on a support and the second component comprising a minor proportion of iridium and rhenium on a separate support. A process for reforming a charge stock, such as naphtha, utilizing such catalyst is also provided.

Abstract: Supported multi-metallic platinum-containing hydrocarbon conversion catalysts which are at least partially deactivated due to the deposition of carbonaceous residues thereon during contact with hydrocarbons are regenerated by (1) contacting the catalyst with oxygen to burn at least a portion of the carbonaceous residues from the catalyst, (2) contacting the carbonaceous residue depleted catalyst with hydrogen at an elevated temperature to convert a substantial portion of the non-platinum component present in the catalyst to its metallic form, (3) contacting the reduced catalyst with dry hydrogen chloride in the absence of oxygen, (4) treatment of the hydrogen chloride treated catalyst with chlorine, and (5) reduction of the chlorine treated catalyst with a reducing agent, such as hydrogen.

Abstract: A method of polymerizing cyclic ethers especially tetrahydrofuran to form high molecular weight polymers using a zeolitic polymerization catalyst.

Abstract: The present invention is directed to a process for desulfurizing petroleum oils and for improving the performance of known catalytic hydrodesulfurization processes. In accordance with the process, a narrow boiling fraction of a typical hydrodesulfurization feedstock is selectively removed prior to the introduction of said feedstock into the hydrodesulfurization unit. Feedstocks include gas oils, residual oils or other fractions which contain sulfur in the form of sulfides, disulfides and a part of a substituted ring such as thiophene, benzothiophene and dibenzothiophene. The invention embodies the discovery that certain intermediate sulfur compounds are the most refractory or difficult to remove.

Abstract: Process for reforming a hydrocarbon charge under reforming conditions in a reforming zone wherein added sulfur is introduced into said zone to counteract excessive hydrocracking of said charge utilizing a catalyst consisting essentially of a minor proportion of platinum on a support and a minor proportion of iridium on a separate support.

Abstract: Process for reforming a hydrocarbon charge under reforming conditions in a reforming zone containing a sulfur-sensitive metal containing reforming catalyst wherein over-cracking of the charge stock and excessive temperature rise in the reforming zone is suppressed by pre-conditioning the catalyst, prior to contact with the charge, with a reformate of specified octane number and aromatics content.

Abstract: Process for reforming a hydrocarbon charge under reforming conditions in a reforming zone containing a sulfur-sensitive metal containing reforming catalyst wherein over-cracking of the charge stock and excessive temperature rise in the reforming zone is suppressed by pre-conditioning the catalyst, prior to contact with the charge, with a reformate of specified octane number and aromatics content.