immobilized with 3-chloroprpyltriethoxysilane (CPTES) to produce
RHACCl. A Schiff bases which were prepared from the reaction of
salisyaldehyde with phenylhydrazine (PHMP), also with 2,4-
dinitrophenylhydrazine (DNPHMP),were functionalized with RHACCl
to give new heterogeneous catalysts labeled as RHPHMP and RHDNPH.
Many techniques have been used to prove the successfully functionalized
silica with PHMP and DNPHMP such as FT-IR ,CHN, X-ray Diffraction,
Scanning Electron Microscopy (SEM) / Energy Dispersive X-Ray
(EDX), and Thermal Gravimetric Analysis (TGA) / Differential Thermal
Analysis (DTA). The FT-IR of the prepared catalysts shows the
disappearance of –NH2 absorption band and appearance of C=N and
C=C absorption bands at the expected position The elemental analysis
and EDX results show an increase in the carbon percentage and presence
of nitrogen which is not found in RHACCl. Thermal analysis TGA/DTA
shows different stages of mass loss attributed to the removal of the
organic moiety in the catalysts structure. The catalytic activity of
RHPHMP, RHDNPH and RHA-Blank (as control) as well as
homogenous PHMP and homogenous DNPHMP were used as catalysts in
the hydrolysis of cellulose . The catalytic activity of the catalysts toward
the respective glucose was found to follow the sequence below.
PHMP > RHPHMP> RHDNPH > DNPHM > RHA.
The catalysts were easily regenerated and could be reused several times
without loss of catalytic activity