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CO Methanation on Mesoporous Ni–VO x /FDU‐12 Catalyst: Effects of the VO x Promoter on Low‐Temperature Activity
Author(s) -
Tian Zhiwei,
Yang Hongyuan,
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.201901270
Subject(s) - catalysis , methanation , x ray photoelectron spectroscopy , non blocking i/o , space velocity , vanadium , temperature programmed reduction , analytical chemistry (journal) , materials science , dissociation (chemistry) , scanning electron microscope , oxygen , inorganic chemistry , nuclear chemistry , chemistry , chemical engineering , selectivity , biochemistry , organic chemistry , chromatography , engineering , composite material
Herein, a series of Ni–VO x /FDU‐12 catalysts are prepared by an incipient impregnation method with FDU‐12 (cubic, Fm‐3m) as the support. The 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. Among all catalysts, Ni–VO x /FDU‐12 with NiO of 10 wt% and V 2 O 5 of 2 wt% (10N2VF) show the best catalytic performance, which reaches maximum CO conversion and CH 4 yield of 99.4% and 89%, respectively, at 325 °C. The lifetime test is conducted at a constant temperature of 450 °C for 100 h at 0.1 MPa and a high weight hourly space velocity (WHSV) of 60 000 mL g −1 h −1 . The 10N2VF exhibit high antisintering and coking properties. The addition of the vanadium promoter improve Ni dispersion and change Ni electron density, which enhance the low‐temperature ability for CO dissociation via the weakening of CO linkage. In contrast, a large number of oxygen vacancies formed by the oxidation–reduction cycle of V 5+ /V 4+ /V 3+ can enhance the dissociation of the by‐product CO 2 and generate oxygen intermediates, which prevent carbon deposition on the surface of Ni particles.