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Perovskite LaNiO 3 Nanocrystals inside Mesostructured Cellular Foam Silica: High Catalytic Activity and Stability for CO 2 Methanation
Author(s) -
Zhang Tengfei,
Liu Qing
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201901164
Subject(s) - lanio , catalysis , materials science , chemical engineering , x ray photoelectron spectroscopy , methanation , citric acid , perovskite (structure) , space velocity , calcination , inorganic chemistry , nuclear chemistry , chemistry , organic chemistry , optoelectronics , dielectric , engineering , ferroelectricity , selectivity
To simultaneously obtain high catalytic activity and stability, LaNiO 3 ‐based catalysts supported on mesostructured cellular foam (MCF) silica are prepared by a citric acid–assisted impregnation method and applied for a CO 2 methanation reaction. These MCF‐supported perovskite LaNiO 3 (LaNiO 3 /MCF) samples are characterized by nitrogen adsorption, X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, H 2 ‐temperature‐programmed reduction, and X‐ray photoelectron spectroscopy. The results indicate that these catalysts offer highly dispersed La 2 O 3 and metallic Ni nanoparticles with intimate contact inside the pores of MCF support after reduction in H 2 flow. Compared with the catalyst prepared by the coimpregnation method (30LNOM‐Im‐650), the citric acid–assisted LaNiO 3 /MCF (30LNOM‐C‐650) catalyst exhibits a much higher catalytic activity due to its higher Ni dispersion and stronger interrelationship between La 2 O 3 and Ni species. In the 100 h‐lifetime test under the conditions of 450 °C, 0.1 MPa, and a high weight hourly space velocity of 60 000 mL g −1 h −1 , 30LNOM‐C‐650 also shows a high long‐term stability without Ni sintering, which is attributed to the formation of enhanced interaction between metallic Ni and La 2 O 3 via La 2 O 2 CO 3 species on their interface as well as the confinement effect of the MCF support.