Effects of reduction time on crystallite size and catalytic activity of nickel/zeolite-y catalysts for methanation reaction

Conference · Mon Jan 01 04:00:00 EST 1979 · 86th AIChE Natl. Meet. Prepr.; (United States)

OSTI ID:6693767

Bhatia, S; Bakhshi, N N; Mathews, J F

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.

• Research Organization: Univ. Sask.
• OSTI ID: 6693767
• Report Number(s): CONF-790405-
• Conference Information: Journal Name: 86th AIChE Natl. Meet. Prepr.; (United States) Journal Volume: 10F
• Country of Publication: United States
• Language: English

Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
CATALYSTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
MATERIALS
METHANATION
MINERALS
NICKEL COMPOUNDS
NICKEL NITRATES
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
REDUCTION
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ZEOLITES