Catalyst comprising of element from group 1B and VIIIB activated by oxygen or oxygen containing compound
AssigneeChulalongkorn University
InventorPiyasan Praserthdam
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Abstract
The present invention relates to catalysts which comprise element(s) of group IB, and element(s) and/or compound(s) of the transition metals, with or without support. The catalyst are activated with O.sub.2 and/or oxygen containing compound(s) or the mixture of oxygen and/or oxygen containing compound(s) with inert gas(es) to make them more active.
Claims16
A catalyst comprising element(s) of group IB, and element(s) and/or compound(s) of the group VIIIB element(s), with or without support or modifier(s), said catalyst being reduced with a reducing agent at an effective temperature for an effective period of time and then being activated with a very small amount of oxygen and/or oxygen containing compound(s) or the mixture of oxygen and/or oxygen containing compound(s) with inert gas(es), at a low temperature, to make it at least 10 percent more active, wherein the ratio of O.sub.2 and/or oxygen containing compound(s) calculated as atomic ratio of oxygen in O.sub.2 and/or in the oxygen containing compound(s) to the element(s) of group IB in the catalyst is in the range of 0.0001-1000:1 in parts by atoms, and wherein the temperature while O.sub.2 and/or the oxygen containing compound(s) or the mixture of oxygen and/or oxygen containing compound(s) with inert gas(es) is passed through the catalyst mixture is in the range of 0.degree.-200.degree. C., providing that when said element of group IB is Cu said catalyst being activated with N.sub.2 O.
A process for the preparation of a catalyst, which process comprises the following steps:
- (i) providing a catalyst mixture comprising element(s) of group IB, and element(s) and/or compound(s) of the group VIIIB element(s), with or without support, or modifier(s);
- (ii) reducing said catalyst mixture with a reducing agent at an effective temperature for an effective period of time;
- (iii) activating said catalysts mixture with a small effective amount of O.sub.2 and/or oxygen containing compound(s) or the mixture of oxygen and/or oxygen containing compound(s) with inert gas(es) at an effective temperature;
- whereby the oxygen and/or oxygen containing compound(s) or the mixture of oxygen and/or oxygen containing compounds with inert gas(es) are added to the catalyst from (ii) in one portion or in several small portions, wherein the ratio of O.sub.2 and/or oxygen and/or in the oxygen containing compound(s) calculated as atomic ratio of oxygen in O.sub.2 and/or in the oxygen containing compound(s) to the element(s) of group IB in the catalyst is in the range of 0.0001-1000:1 in parts by atom, and wherein the temperature while O.sub.2 and/or the oxygen containing compound(s) or the mixture of oxygen and/or oxygen containing compound(s) with inert gas(es) is passed through the catalyst mixture is in the range of 0.degree.-200.degree. C., providing that when said element of group IB is Cu said catalyst is activated with N.sub.2 O.
Dependencies are inferred from the claim text.