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- W321131479 abstract "Catalysts prepared by impregnating or ion-exchanging a CaY zeolite with a nickel nitrate solution to 5.19 and 5.78Vertical Bar3< by wt Ni, respectively, were reduced in flowing hydrogen at 450/sup 0/C for 6-24 hr. The metal surface area of the fresh catalysts, determined from hydrogen chemisorption, increased with increasing reduction time. For both impregnated and ion-exchanged Ni/CaY, maximum activities (calculated as the turnover numbers) for CO methanation determined in a fixed-bed differential reactor at 250/sup 0/-350/sup 0/C and 3.1:1 H/sub 2//CO ratio occurred at an average nickel crystallite size of approx. 14 nm, measured from X-ray diffraction line broadening. At this optimum crystallite size, which corresponded to a reduction time of 18 hr, the impregnated Ni/CaY catalyst was approx. 30Vertical Bar3< more active than the ion-exchanged catalyst, but a 5.75Vertical Bar3< Ni/g-Al/sub 2/O/sub 3/ catalyst prepared by impregnation was more active than either of the zeolite-supported catalysts." @default.
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- W321131479 date "1979-01-01" @default.
- W321131479 modified "2023-09-27" @default.
- W321131479 title "Effects of reduction time on crystallite size and catalytic activity of nickel/zeolite-y catalysts for methanation reaction" @default.
- W321131479 hasPublicationYear "1979" @default.
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