TY  - JOUR
JF  - Journal of Molecular Liquids
VL  - 272
Y1  - 2018///
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85054334683&doi=10.1016%2fj.molliq.2018.09.077&partnerID=40&md5=c457811f3a8f3bf878cdc0528994777d
A1  - Nadeem, S.
A1  - Mumtaz, A.
A1  - Mumtaz, M.
A1  - Abdul Mutalib, M.I.
A1  - Shaharun, M.S.
A1  - Abdullah, B.
N1  - cited By 30
PB  - Elsevier B.V.
SP  - 656
AV  - none
N2  - Mesoporous Ti-MCM-48 photocatalyst, with Si/Ti (wt/wt) ratio of 100, 50 and 25 was effectively applied for CO2 reduction into methanol under UVâ??visible light irradiation bearing mid gap energy states and Ti3+ sites. The bare Ti-MCM-48 with Si/Ti (wt/wt) ratio of 25 displayed highest photocatalytic methanol yield (85.88 μmol gâ??1 Lâ??1) with a BET surface area of 1528 m2 gâ??1 and mid gap energy states as determined from the XPS analysis, compared to the other composite ratios. The Ti-MCM-48(25) impregnated with Cu-porphyrin (CuTPP) resulted in methanol yield of 297 μmol·gâ??1 under 33 mW·cmâ??2 simulated light intensity, using 0.1 M Na2SO3 in 0.1 M NaOH as supporting electrolytes, which is 3.45 times higher than the bare Ti-MCM-48(25) due to the visible light excitation of the porphyrin macrocycle and charge transition from the lowest occupied molecular orbital (LUMO) of CuTPP to the Ti3+ metal centers. Also, methanol yield was studied with CO2 gas-liquid mass transfer and mass transfer limitations prevailing in the reactor. Mass transfer limitation experiments revealed that metal loading, catalyst concentration, stirring speed and light intensity influence the methanol yield. © 2018 Elsevier B.V.
SN  - 01677322
KW  - Carbon dioxide; Copper compounds; Light; Mass transfer; Mesoporous materials; Methanol; Molecular orbitals; Photocatalysts; Porphyrins; Sodium hydroxide; Sodium sulfite
KW  -  Lowest occupied molecular orbitals; Mass transfer limitation; Mesoporous; Metalloporphyrins; Supporting electrolyte; Ti-mcm-48; Visible light excitation; Visible-light irradiation
KW  -  Titanium compounds
TI  - Visible light driven CO2 reduction to methanol by Cu-porphyrin impregnated mesoporous Ti-MCM-48
ID  - scholars9485
EP  - 667
ER  -