Novel sulfation effect on low-temperature activity enhancement of CeO₂-added Sb-V₂O₅/TiO₂ catalyst for NH₃-SCR

Maqbool, M.S.,Pullur, A.K.,Ha, H.P. Elsevier 2014 Applied Catalysis B Vol.152 No.-

Sulfur dioxide (SO<SUB>2</SUB>) is considered as a poisoning gas for NH<SUB>3</SUB>-SCR catalysts under real time conditions. However, it has revealed an obvious beneficial effect on the activity of CeO<SUB>2</SUB> containing catalysts. Hereby we report the applied research in sulfation effect on low-temperature activity enhancement of CeO<SUB>2</SUB>-modified, Sb<SUB>2</SUB>O<SUB>3</SUB>-V<SUB>2</SUB>O<SUB>5</SUB>-TiO<SUB>2</SUB> catalyst system pretreated with SO<SUB>2</SUB> under oxidizing conditions at different temperatures for 2h. We have elucidated the real insights via nature-property relationships of the species formed at various SO<SUB>2</SUB> pretreatment temperatures (T=300, 400 and 500<SUP>o</SUP>C) with the help of advanced characterization techniques such as X-ray diffraction (XRD), temperature programmed reaction (NH<SUB>3</SUB>-TPD, NO-TPD and H<SUB>2</SUB>-TPR), BET surface area, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray photoelectron spectroscopy (XPS). Our results indicated that SO<SUB>2</SUB> pre-treatment at 500<SUP>o</SUP>C led to the maximum favorable sulfation with cerium(III) sulfate as the major surface species.

Vanadia-modified Sb–CeO2/TiO2 catalyst for effective removal of NO by NH3

Lee, K. J.,Maqbool, M. S.,Pullur, A. K.,Jeong, Y. E.,Song, K. H.,Ha, H. P. VSP 2015 Research on chemical intermediates Vol.41 No.4

<P>The Sb-CeO2/TiO2 (SCT) catalytic system with different vanadia loading (0-3 % w/w) was systematically investigated for removal of NO by NH3. A series of catalysts prepared by impregnation and deposition precipitation methods were thoroughly characterized physically, by BET surface area, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), and chemically, by temperature-programmed desorption (NH3 and SO2-TPD), temperature programmed reduction (H-2-TPR), and in-situ DRIFT study. NH3-TPD and H-2-TPR results for 2 and 3 % vanadia-loaded Sb-CeO2/TiO2 catalysts revealed high total acidity and reducibility. As a result, both catalysts had high activity at low temperatures. At 240 A degrees C for 20 h the 2 % vanadia-loaded Sb-CeO2/TiO2 catalyst was more resistant to SO2 than the 3 % vanadia catalyst. In addition, in-situ SO2 DRIFT study revealed the existence of more surface sulfate species on Sb-CeO2/TiO2 than on vanadia-loaded Sb-CeO2/TiO2 catalysts.</P>

GENERATING FUNCTIONS OF (p, q)-ANALOGUE OF ALEPH-FUNCTION SATISFYING TRUESDELL'S ASCENDING AND DESCENDING F_p,q-EQUATION

ALTAF A. BHAT,M. YOUNUS BHAT,H. MAQBOOL,D.K. JAIN The Korean Society for Computational and Applied M 2023 Journal of applied mathematics & informatics Vol.41 No.2

In this paper we have obtained various forms of (p, q)-analogue of Aleph-Function satisfying Truesdell's ascending and descending F_p,q-equation. These structures have been employed to arrive at certain generating functions for (p, q)-analogue of Aleph-Function. Some specific instances of these outcomes as far as (p, q)-analogue of I-function, H-function and G-functions have likewise been obtained.

Evolution of phase structure and giant strain at low driving fields in Bi-based lead-free incipient piezoelectrics

Maqbool, A.,Hussain, A.,Malik, R.A.,Rahman, J.U.,Zaman, A.,Song, T.K.,Kim, W.J.,Kim, M.H. Elsevier 2015 Materials science and engineering B. Advanced Func Vol.199 No.-

Lead-free 0.99[(Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>)<SUB>0.935</SUB>Ba<SUB>0.065</SUB>Ti<SUB>(1-x)</SUB>Nb<SUB>x</SUB>O<SUB>3</SUB>]-0.01SrZrO<SUB>3</SUB> (BNBTNb100x-SZ, with Nb100x=0-1) ceramics were prepared by the conventional mixed oxide route. X-ray diffraction and Raman scattering was utilized for the structural evolution of Nb-modified BNBT-SZ ceramics at average and short-scale localized structure. Temperature dependent dielectric properties showed ferroelectric-ergodic relaxor (FE-ER) transition in Nb-modified BNBT-SZ ceramics by producing a significant disruption of the long-range FE order. A giant normalized strain of 825pm/V at 4kV/mm was achieved at Nb1.0. Interestingly, at a relatively low applied field of 3kV/mm, the Nb0.75 sample displayed a large electric field-induced strain (EFIS) response of 0.20%, which is highest value obtained in non-textured lead-free BNT-based ceramics at such low driving field. The structural distortion induced by doping and electric poling is correlated with the dielectric, ferroelectric and EFIS response, and the evolution of giant strain was ascribed to reversible field induced phase transition from ER-FE phase.

Phase structure and electromechanical behavior of Li, Nb co-doped 0.95Bi_0.5Na_0.5TiO₃-0.05BaZrO₃ ceramics

Hussain, A.,Maqbool, A.,Malik, R.A.,Lee, J.H.,Sung, Y.S.,Song, T.K.,Kim, M.H. Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.suppl1

In this work, the effect of Li, Nb co-doping on the structural phase, dielectric, ferroelectric and field induced strain behavior of 0.95Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>TiO<SUB>3</SUB>-0.05BaZrO<SUB>3</SUB> (BNT-BZ5) ceramic was investigated. X-ray diffraction patterns revealed the formation of single phase perovskite structure in the studied composition range. However, with increasing Li, Nb co-doping concentration, the maximum dielectric constant decreased and the dielectric maximum temperature (T<SUB>m</SUB>) slightly shifted towards higher temperature. The field induced strain response increased from 0.18% for pure BNT-BZ5 to 0.38% for 1mol.% Li, Nb modified BNT-BZ5 sample. The corresponding dynamic piezoelectric coefficient for these composition were (S<SUB>max</SUB>/E<SUB>max</SUB> = 257pm/V) and (S<SUB>max</SUB>/E<SUB>max</SUB> = 542pm/V), respectively. These results suggest that the BNLTN-BZ ceramic can be considered as a promising candidate material for piezoelectric application.

Structural and electromechanical properties of Na_0.5Bi_0.5TiO₃ceramics produced by different synthesis routes

Hussain, A.,Maqbool, A.,Malik, R. A.,Kim, M. H.,Song, T. K.,Kim, W. J. IOP Publishing 2016 IOP conference series. Materials science and engin Vol.146 No.-

Fate and fouling characteristics of fluorescent dissolved organic matter in ultrafiltration of terrestrial humic substances

Quang, V.L.,Kim, H.C.,Maqbool, T.,Hur, J. Pergamon Press 2016 CHEMOSPHERE - Vol.165 No.-

Ultrafiltration (UF) membrane fouling caused by terrestrial input of dissolved organic matter (DOM), especially during high flood periods, is poorly understood. In this study, we examined the fouling characteristics of three different terrestrial humic substances (HS) on regenerated cellulose (RC) UF membranes with the pore sizes of 30 k-3 kDa via conventional bulk HS measurements as well as an advanced fluorescence spectroscopy. The fluorescence excitation-emission matrix coupled with parallel factor analysis (EEM-PARAFAC) identified one protein-like (C1) and three humic-like fluorescent components (C2-C4) from soil and leaf-derived HS. The fate of the different fluorescent components was individually tracked for the UF processes. The higher removal rates were found generally on the order of high molecular weight (HMW) C1 to smaller sized humic-like components (C4 > C3 > C2) regardless of the HS sources, implying the importance of HS molecular sizes on the UF operation. Among the humic-like components, C2 was the most associated with irreversible fouling, while other two humic-like components contributed more to reversible fouling. For soil-derived HS, C4 can be suggested as a good surrogate for membrane fouling, as evidenced by the highest correlation between the removal rates and the total fouling indices among the tested HS variables including conventional bulk parameters. Our study demonstrated a promising application of EEM-PARAFAC for probing membrane fouling of terrestrial DOM, which provided additional insight into the fate of different fluorescent components on the UF processes.

Field induced strain response of lead-free BaZrO₃-modified Bi_0.5Na_0.5TiO₃-BaTiO₃ ceramics

Rahman, J.U.,Hussain, A.,Maqbool, A.,Ryu, G.H.,Song, T.K.,Kim, W.J.,Kim, M.H. Elsevier Sequoia 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.593 No.-

Lead-free (0.935-x)[Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>TiO<SUB>3</SUB>-0.065BaTiO<SUB>3</SUB>]-xBaZrO<SUB>3</SUB> (BNBT-xBZ, with x=0-0.07) ceramics were prepared by a conventional solid-state reaction method. The effect of BZ addition on the crystal structure, microstructure, dielectric, ferroelectric and electric field induced strain behavior of BNBT ceramic was investigated. X-ray diffraction patterns of BNBT-xBZ ceramics revealed the formation of single phase perovskite structure in the studied composition range. Addition of BZ in BNBT transform the crystal structure from tetragonal to pseudocubic symmetry. However, with increasing BZ content, the maximum dielectric constant decreased and the dielectric maximum temperature (T<SUB>m</SUB>) shifted towards lower temperature. The field induced strain response of BNBT-xBZ increases from 0.16% for x=0 to 0.38% for x=0.03, at an applied field of 7kV/mm. The corresponding dynamic piezoelectric coefficient for these composition were (S<SUB>max</SUB>/E<SUB>max</SUB>=231pm/V) and (S<SUB>max</SUB>/E<SUB>max</SUB>=542pm/V), respectively. These results suggest that the BNBT-0.03BZ ceramic can be considered as a promising candidate material for piezoelectric application.

Lower Incidence but More Aggressive Behavior of Right Sided Breast Cancer in Pakistani Women: Does Right Deserve More Respect?

Fatima, Nosheen,Zaman, Maseeh Uz,Maqbool, Aamir,Khan, Shaista H.,Riaz, Nazia Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.1

Background: The aim of this epidemiological study was to establish the laterality of breast cancer (BC) and its association with size, receptor status of the primary tumor and bone metastasis (BM) in a local population. Materials and Methods: This retrospective study included cases of BC from Jan-2009 to Dec-2011 who were referred for metastatic work up or follow up survey with Technetium-99m MDP bone scan (BS) to the Nuclear Medicine Department of Karachi Institute of Radiotherapy and Nuclear Medicine (KIRAN). A total of 384 patients out of 521 were included and all reviewed for age, primary tumor size (PTS), laterality, receptor status like estrogen receptor (ER) progesterone receptor (PR) and Her-2-Neu receptor, presence or absence of BM with sites of involvement and time interval between diagnosis of BC and appearance of BM. Results: The left to right sided BC proportion was significantly higher than unity (59%:41%; p<0.001). The right sided BC was observed in younger age group (46:52 years; p<0.0001) and with a smaller PTS than the left sided (3.43:4.15 cm; p<0.0001). The patients with BM had relatively higher negative receptor status with a significant predominance of right sided BC. The overall incidence of BM on BS was 28% and relatively higher in right than left breast (33%:24% p=0.068). The average number of BM sites was also significantly greater for the right side (6:4, P<0.0001). The % cumulative risk of BM in right breast was noted at significantly smaller PTS than left side with log rank value of 5.579; p<0.05. The Kaplan Meier survival plot for event free survival of BM in left sided BC was significantly higher than for the right side (log rank value=4.155, p<0.05), with an earlier appearance of BM in right BC. Conclusions: 1) A left sided predominance of BC was seen in local population; 2) right sided BC had a more aggressive behavior with extensive and earlier appearance of BM at relatively younger age, smaller PTS and receptor (s) negativity.

Dielectric, ferroelectric and field-induced strain response of lead-free BaZrO₃-modified Bi_0.5Na_0.5TiO₃ ceramics

Rahman, J.U.,Hussain, A.,Maqbool, A.,Song, T.K.,Kim, W.J.,Kim, S.S.,Kim, M.H. Elsevier 2014 Current Applied Physics Vol.14 No.3

Lead-free piezoelectric ceramics (1 - x)Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>TiO<SUB>3</SUB>-xBaZrO<SUB>3</SUB> (BNT-BZ100x, with x = 0-0.10) were prepared using a conventional solid-state reaction method. The crystal structure, microstructure, dielectric, ferroelectric, and piezoelectric properties of BNT-BZ100x ceramics were studied as functions of different BZ content. X-ray diffraction patterns revealed that the BZ completely diffused in the BNT lattice in the studied composition range. An appropriate amount of BZ addition improved the dielectric, ferroelectric, and piezoelectric properties of BNT ceramics. The remanent polarization (P<SUB>r</SUB>) and piezoelectric constant (d<SUB>33</SUB>) increased from 22 μC/cm<SUP>2</SUP> and 60 pC/N for pure BNT to 30 μC/cm<SUP>2</SUP> and 112 pC/N for x = 0.040, respectively. In addition, electric field-induced strain was enhanced to its maximum value (S<SUB>max</SUB> = 0.40%) with normalized strain (d*<SUB>33</SUB> = S<SUB>max</SUB>/E<SUB>max</SUB> = 500 pm/V) at an applied electric field of 8 kV/mm for x = 0.055. The enhanced strain can be attributed to the coexistence of ferroelectric and relaxor ferroelectric phases.