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

Conference · Mon Jan 01 00:00:00 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-
• Journal Information: 86th AIChE Natl. Meet. Prepr.; (United States), Vol. 10F; Conference: AIChE meeting, Houston, TX, USA, 1 Apr 1979
• Country of Publication: United States
• Language: English

Related Subjects

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