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Methanation of carbon dioxide over zeolite-encapsulated nickel nanoparticles

DOI: 10.1002/cctc.201701946 DOI Help

Authors: Farnoosh Goodarzi (Technical University of Denmark) , Liqun Kang (University College London (UCL)) , Feng Ryan Wang (University College London) , Finn Joensen (Haldor Topsøe A/S) , Søren Kegnaes (Technical University of Denmark) , Jerrik Mielby (Technical University of Denmark)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemcatchem

State: Published (Approved)
Published: January 2018
Diamond Proposal Number(s): 15151

Abstract: Here we present a simple and effective method to encapsulate Ni nanoparticles in zeolite silicalite-1. In this method, the zeolite is modified by selective desilication, which creates intra-particle voids and mesopores that facilitate the formation of small and well-dispersed nanoparticles upon impregnation and reduction. TEM and XPS analysis confirm that a significant part of the Ni nanoparticles are situated inside the zeolite rather than on the outer surface. The encapsulation results in an increased metal dispersion and, consequently, a high catalytic activity for CO2 methanation. With a gas hourly space velocity of 60000 ml/g catalyst h-1 and H2/CO2=4, the zeolite-encapsulated Ni nanoparticles result in 60% conversion at 450°C, which corresponds to a site-time yield of around 304 mol CH4/mol Ni h-1. The encapsulated Ni nanoparticles show no change in activity or selectivity after 50 h of operation, although post-catalysis characterisation reveals some particle migration.

Journal Keywords: methanation; zeolite; encapsulated nanoparticles; nickel; Heterogeneous catalysis

Subject Areas: Chemistry, Energy, Materials


Instruments: B18-Core EXAFS

Added On: 16/01/2018 14:32

Discipline Tags:

Zeolites Energy Storage Energy Physical Chemistry Catalysis Chemistry Materials Science Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS) X-ray Absorption Near Edge Structure (XANES)