Eggshell catalyst for preparation of ethylene through selective hydrogenation of acetylene
An eggshell-type catalyst, a technology for selective hydrogenation, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, hydrogenation to hydrocarbons, etc., and can solve problems such as research reports on eggshell structure catalysts that have not yet been seen , to achieve the effect of improving ethylene selectivity and high ethylene selectivity
Inactive Publication Date: 2010-06-23
DALIAN UNIV OF TECH
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Problems solved by technology
But for the selective hydrogenation of acetylene, there is no research report on eggshell structure catalysts.
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[0012] The specific implementation manners of the present invention will be described in detail below in conjunction with the technical solutions.
[0013] Commercial γ-Al with a diameter of 1mm is used 2 o 3 spheres as carriers, Pd(NO 3 ) 2 The aqueous solution was used as the impregnating solution, ethanol was used as the competitive adsorbent, and after unequal impregnation and drying, the catalyst was calcined at 500°C for 3 hours to obtain an eggshell catalyst with a Pd loading of 0.03wt%. The Ag component consists of AgNO 3 The conventional equivalent impregnation method of aqueous solution is added, and the drying and roasting conditions are the same as above. The atomic ratio of Ag to Pd is 2:1.
[0014] The performance of the catalyst for selective hydrogenation of acetylene was investigated in a packed fixed-bed reactor (i.d.4 mm), mainly evaluating the conversion rate of acetylene and ethylene selectivity. The loading amount of the catalyst is 0.12 g. The use...
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The invention relates to an eggshell catalyst for preparation of ethylene through selective hydrogenation of acetylene, which belongs to the technical field of oil (natural gas) chemical synthesis and novel catalytic materials and relates to the eggshell catalyst with excellent catalytic properties for preparation of ethylene through selective hydrogenation of acetylene. The eggshell catalyst is characterized in that an alumina (Al2O3) ball is used as a carrier, a supported catalyst with the active component palladium arranged in an eggshell shape is prepared in the method of impregnation, and Ag is used to modify the eggshell Pd / Al2O3 catalyst. The Pd loading amount is 0.01-0.1 weight percent, and the atomic ratio of Ag and Pd is 1-5. The invention has the advantages that the eggshell catalyst for preparation of ethylene through the selective hydrogenation of acetylene can realize high ethylene selectivity under the condition with a high acetylene conversion rate, particularly under the condition that the acetylene conversion rate is close to 100 percent.
Description
technical field [0001] The invention belongs to the technical field of synthesis of petroleum (natural gas) chemical products and novel catalytic materials, and relates to an eggshell catalyst with excellent catalytic performance for acetylene selective hydrogenation to ethylene. Background technique [0002] Palladium-based catalysts supported on alumina are usually used to catalyze the selective hydrogenation of acetylene to ethylene. Generally, as the conversion rate of acetylene increases, the selectivity of ethylene decreases. Especially when the conversion of acetylene is close to 100%, the selectivity of ethylene drops sharply. In order to obtain higher ethylene selectivity under high acetylene conversion conditions (especially close to 100%), many studies have devoted to the addition of some additives such as Cu, Co, Ni, K, Ti and Ag to improve the catalyst. performance (Appl. Catal. A: Genaral, 2002, 223: 161). The palladium catalyst described in Chinese patent Z...
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Login to View More IPC IPC(8): B01J23/50B01J35/02C07C11/04C07C5/09
CPCY02P20/52
Inventor 朱爱民葛皓李小松石川
Owner DALIAN UNIV OF TECH