-
Niobium is a
chemical element; it has
symbol Nb (formerly columbium, Cb) and
atomic number 41. It is a
light grey, crystalline, and
ductile transition...
- tetrahedrally.
There is an
uncharacterised solid hydrate, Nb2O5·nH2O, the so-called
niobic acid (previously
called columbic acid),
which can be
prepared by hydrolysis...
- emplo**** industrially,
including polystyrene sulfonate,
solid phosphoric acid,
niobic acid, and heteropolyoxometallates.
Solid acids are used in
catalysis in...
-
results have been
reported when the
catalyst is
applied to a
support of
niobic acid and/or
tantalic acid. It is also
obtained by
reductive amination of...
-
including sulfonated polystyrene,
sulfonated carbon,
solid phosphoric acid,
niobic acid, and heteropolyoxometallates. A
particularly large scale application...
-
Niobium and Tantalum.
Charles Griffin &
Company Ltd, 1929. pp 166. Oxalo-
niobic Acid. Shen, Panwen; et al.
Series of
Inorganic Chemistry. Vol 8. Titanium...
-
extended metal oxides (M2O5), or in the case of Nb even from
mixtures of
niobic acid and
alkali metal hydroxides in
aqueous solution. The hexatantalate...
- S. Ikeda, and B. Ohtani,
Amphiphilic NaY
zeolite particles loaded with
niobic acid:
Materials with
applications for
catalysis in
immiscible liquid-liquid...
