Highly dispersed supported group VIII metal-phosphorus compounds, and highly dispersed, supported group VIII metal-arsenic and a process for making said compounds

A method for preparing Group VIII metal-phosphorus compounds supported on a high surface area solid carbon support, wherein the Group VIII metal-phosphorus crystallite size is about 300 A or less, wherein the process consists of the steps of:

• (a) impregnating said high surface area carbon support with a solution of at least one water soluble Group VIII metal salt selected from the group consisting of Group VIII metal chlorides, Group VIII metal nitrates and Group VIII metal ammonia complexes;
• (b) impregnating said carbon support with phosphoric acid in an amount sufficient to result in a phosphorus to Group VIII metal atomic ratio of about 0.3 to about 3.0;
• (c) reducing the reducible deposited components resultant from the completion of steps (a) and (b) in a gaseous reducing atmosphere at a temperature in the range of about 200.degree. C. to about 650.degree. C. for a time sufficient to generate the supported Group VIII metal-phosphorus compounds.

A method for preparing Group VIII metal-phosphorus compounds supported on a high surface area solid support selected from the group consisting of carbon, alumina, silica, silica-alumina, zeolite, kieselguhr, vermiculite, the refractory oxides of Group IVb and Vb transition metals and mixtures thereof wherein said support contains a chemical species selected from the group consisting of a reducible phosphorus-containing compound and elemental phosphorus, wherein the Group VIII metal-phosphorus crystallite size is about 300 A or less wherein the process consists of the steps of;

• (a) impregnating said high surface area support with a solution of at least one water soluble Group VIII metal salt selected from the group consisting of Group VIII metal chlorides, Group VIII metal nitrates and Group VIII metal ammonia complexes;
• (b) reducing the composition resultant from the completion of step (a) in a gaseous reducing atmosphere at a temperature in the range of about 200.degree. C. to about 650.degree. C. for a time sufficient to generate the desired supported Group VIII metal-phosphorus compounds.

A method for preparing a Group VIII metal-arsenic compound supported on a high surface area support selected from the group consisting of carbon, alumina, silica, silica-alumina, zeolite, kieselguhr, vermiculite, the refractory oxides of Group IVb and Vb transition metals, and mixtures thereof wherein the Group VIII metal-arsenic compound has a crystallite size of about 300 A or less, wherein the process consists of the steps of:

• (a) impregnating said high surface area support with a solution of at least one water soluble Group VIII metal salt selected from the group consisting of Group VIII metal chlorides, Group VIII metal nitrates and Group VIII metal ammonia complexes;
• (b) impregnating said support with a chemical species selected from the group consisting of arsenic and a water soluble arsenite salt in an amount sufficient to result in an arsenic to Group VIII metal atomic ratio of about 0.3 to about 3.0;
• (c) reducing the reducible deposited components resultant from the completion of steps (a) and (b) in a gaseous reducing atmosphere at a temperature in the range of about 200.degree. C. to about 650.degree. C. for a time sufficient to generate the desired supported Group VIII metal-arsenic compounds. pg,38