The use of alumatrane for the preparation of high‐surface‐area nickel aluminate and its activity for CO oxidation

Abstract

Supported nickel has been used in a wide range of applications for industrial reactions, such as steam reforming, hydrogenation and methanation. In this work, nickel aluminate was prepared by the sol-gel process using alumatrane as the alkoxide precursor, directly synthesized from the reaction of inexpensive and available compounds, aluminum hydroxide and TIS (triisopropanolamine) via the oxide one pot synthesis (OOPS) process. Various conditions of the sol-gel process, such as pH, calcination temperature, hydrolysis ratio and ratio of nickel to aluminum, were studied. All samples were characterized using FTIR, TGA, XRD, TPR, DR-UV and BET. The BET surface area was in the range of 340-450 m 2 /g at the calcination temperature of 500 • C with a mesoporous pore size distribution. Catalyst activity testing in CO oxidation reaction depended on Ni : Al ratio and calcination temperature. Higher activity was obtained from higher Ni content and lower calcination temperature. In addition, catalysts prepared using alumatrane precursor had higher percentage conversion than those prepared using aluminum hydroxide precursor.

Ordered Mesoporous Alumina-Supported Metal Oxides

“…For instance, nickel aluminate (NiAl 2 O 4 ) is used as a catalyst for several hydrogenation and dehydrogenation reactions: oxidative dehydrogenation of ethane to ethylene for petrochemical purposes, conversion of methane and carbon dioxide to syngas, and hydrogenation of nitriles . Nickel aluminate is relatively inexpensive compared to other known active catalysts, has strong resistance to acids and bases, and has high thermal stability . Several methods have been employed for the synthesis of NiAl 2 O 4 including wet impregnation of Al 2 O 3 , pelletization and sintering of Al 2 O 3 and NiO, as well as those previously discussed.…”

“…23 Nickel aluminate is relatively inexpensive compared to other known active catalysts, 22 has strong resistance to acids and bases, 24 and has high thermal stability. 25 Several methods have been employed for the synthesis of NiAl 2 O 4 including wet impregnation of Al 2 O 3 , 21 pelletization and sintering of Al 2 O 3 and NiO, 26 as well as those previously discussed. Also, other alumina-supported metal oxides have found various applications: magnesium aluminum oxide is used as a refractory material 27 and in sensors and electronic devices; 28 calcium aluminum oxide is used in high-strength industrial and dental cements, flame detectors, 29 and as hydraulic materials; 27 titanium aluminum oxide is used as a potential adsorbent in the chemical decontamination of chemical warfare agents, 30 in materials for aeronautical and automotive purposes, 31 and in orthopedic and dental implants; 32 and chromium aluminum oxide is used as temperature sensors 33 and for dehydrogenation of alkanes.…”

Boron, aluminium, gallium, indium and thallium

“…125 Aluminate materials returned to topicality recently. Alumatrane once again found interest for reasons of chirality, 126 or for reasons of coordination protection 127 or for reasons of its use as a precursor, this time to nickel aluminate 128 NiAl 2 O 4 catalyst. The Sr analogue SrAl 2 O 4 was manufactured in nanotube form, through an interesting process of scrolling and high-temperature annealing.…”

Ni/Pillared Clays as Catalysts for the Selective Catalytic Reduction of Nitrogen Oxides by Propene

“…3c, d). According to the literature, it is possible to distinguish the d-d transitions of Ni 2+ ions in different environments [31,32]. An absorption band appears around 350 nm, attributed with the 3 A 2g -1 T 1g (D) transition of octahedral Ni(II) in NiO.…”