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Hierarchically Porous Network‐Like Ni/Co 3 O 4 : Noble Metal‐Free Catalysts for Carbon Dioxide Methanation
Author(s) -
Wang Yuan,
Arandiyan Hamidreza,
Scott Jason,
Dai Hongxing,
Amal Rose
Publication year - 2018
Publication title -
advanced sustainable systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.499
H-Index - 24
ISSN - 2366-7486
DOI - 10.1002/adsu.201700119
Subject(s) - methanation , catalysis , noble metal , transition metal , hydrogen , materials science , selectivity , inorganic chemistry , chemical engineering , chemistry , organic chemistry , engineering
The impasse always present regarding catalysts for energy conversion reactions is that noble metals with promising activity are limited by their high price and scarcity, whereas base metals with a lower price show moderate activity performance. Herein, a purely transition metal‐based, Ni‐promoted 3D draped porous Co 3 O 4 (Ni/3DDP‐Co 3 O 4 ) catalyst is demonstrated to be highly effective for CO 2 methanation, achieving 100% CO 2 conversion and CH 4 selectivity at 250 °C and a space velocity of 48 000 mL (g h) −1 . Dispersing Ni nanodeposits on the large surface of the 3DDP‐Co 3 O 4 promotes a 2.6 times increase in reaction rate and a 20% drop in apparent activation energy relative to 3DDP‐Co 3 O 4 . An abundance of surface oxygen vacancies extrinsically forms on the Ni/3DDP‐Co 3 O 4 by both Co–Ni charge‐compensating mechanisms and hydrogen treatment, in conjunction with the low‐temperature reducibility, high surface area, and strong Co–Ni interaction effect, enabling the enhanced catalytic performance for CO 2 methanation.