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Effect of Ni Incorporation into Malachite Precursors on the Catalytic Properties of the Resulting Nanostructured CuO/NiO Catalysts
Author(s) -
Ortega Klaus Friedel,
Hüttner Andreas,
Heese Justus,
Behrens Malte
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201501425
Subject(s) - calcination , chemistry , catalysis , malachite , coprecipitation , thermogravimetric analysis , non blocking i/o , thermal decomposition , reaction rate constant , mesoporous material , nuclear chemistry , nickel oxide , inorganic chemistry , kinetics , copper , organic chemistry , physics , quantum mechanics
Abstract Synthetic nickelian malachite nanopowders (Cu 1– x Ni x ) 2 (OH) 2 CO 3 with x = 0, 0.02, 0.04, 0.06, 0.08, and 0.1 were prepared by constant‐pH coprecipitation. N 2 sorption isotherms confirmed a steady increase of the BET surface area with increasing Ni content for the as‐synthesized and calcined mesoporous materials. Powder XRD patterns for x ≤ 0.1 indicate the formation of single‐phase materials with an anisotropic contraction of the unit cell. This is related to the gradual decrease of the Jahn–Teller distortion in the malachite structure. An XRD‐amorphous hydroxide‐rich phase is formed for x > 0.1, which appears as spongelike regions in SEM images. Thermogravimetric analysis showed that nickel lowers the onset of thermal decomposition. Powder XRD patterns of the calcined samples evidence the formation of a tenorite structure despite the presence of Ni. Heterogeneous Fenton‐like decomposition of Bismarck Brown Y with H 2 O 2 showed that a Cu/Ni ratio of 92:8 in the nanostructured oxide leads to the highest reaction rate constant derived from a pseudo‐first‐order kinetic rate law expression. Temperature‐programmed CO oxidation experiments revealed that pure CuO achieved the highest activity. Similar performance was observed for the binary system obtained through calcination of the precursor prepared with a Cu/Ni ratio of 96:4.