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RISS 인기검색어
- 검색키워드
- 저자 : John Parise (검색결과 4 건)
- 무료
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- 유료
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Effects of copper loading on NH3-SCR and NO oxidation over Cu impregnated CHA zeolite
Nusnin Akter,Xianyin Chen,John Parise,Jorge Anibal Boscoboinik,김태진 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.1
Cu/CHA catalysts with various Cu loadings (0.5 wt%-6.0 wt%) were synthesized via incipient wetness impregnation. The catalysts were applied to the selective catalytic reduction (SCR) of NO with NH3 and NO oxidation reaction. XRD and N2 adsorption-desorption data showed that CHA structure was maintained with the incorporation of Cu, while specific surface areas decreased with increasing Cu loading. At intermediate Cu loading, 4 wt%, the highest NH3-SCR activity was observed with ~98% N2 selectivity from 150 oC to 300 oC. Small amounts of water, 2%, slightly increased NO conversion in addition to the remarkable N2O and NO2 reduction at high temperature. Water effects are attributed to the improved Cu ion reducibility and mobility. NO oxidation results provided no relation between NO2 formation and SCR activity. Physicochemical properties, NO conversion, N2 selectivity, and activation energy data showed that impregnated samples’ molecular structure and catalytic activity are comparable to the conventional ion-exchanged (IE) samples’ ones.
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Szulejko, Jan E.,Kim, Ki-Hyun,Parise, John Elsevier 2019 Separation and purification technology Vol.212 No.-
<P><B>Abstract</B></P> <P>To assess the best sorbents available in real-world treatment of airborne volatile organic compounds (VOCs), we explored four sorbent performance metrics (10% breakthrough volume, space velocity, regeneration cycles, and cost) against benzene, a representative VOC, using well-known sorbents in the partial pressure (P<SUB>benzene</SUB>) range 0.01 – 1 Pa. Accordingly, some common materials (e.g., activated carbons) outperformed novel materials like MOFs. The performance of MOFs was often exaggerated as data were generally collected under unrealistic P<SUB>benzene</SUB> (e.g., >5,000 Pa). The use of metrics appropriate to real-world conditions is thus critical for selecting sorbents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Performance of sorbents in real-world treatment of VOC is important for AQM purposes. </LI> <LI> Metrics were selected as breakthrough volume, space velocity, regeneration cycles, and cost. </LI> <LI> Sorbent performance metrics were checked for benzene in the partial pressure 0.01–1 Pa. </LI> <LI> Some common materials (e.g., activated carbons) have the potential to outperform others. </LI> <LI> The use of metrics appropriate to real-world conditions is critical for selecting sorbents. </LI> </UL> </P>
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Effect of niobium oxide phase on the furfuryl alcohol dehydration
Chan, Xiaojun,Pu, Tiancheng,Chen, Xianyin,James, Alwin,Lee, Jaeha,Parise, John B.,Kim, Do Heui,Kim, Taejin Elsevier 2017 CATALYSIS COMMUNICATIONS - Vol.97 No.-
<P><B>Abstract</B></P> <P>Different structural phases (e.g., TT, T, and H) of niobium oxide were synthesized, characterized by XRD and Raman, and utilized for the furfuryl alcohol dehydration and condensation under mild conditions (100°C and ambient pressure). Furfuryl alcohol conversion was dependent on reaction time and niobium oxide phase. Niobic acid and T/H phase transitional niobium oxide showed higher catalytic activity in comparison to a single crystalline phase niobium oxide. While T/H phase transitional niobium oxide showed higher conversion than that of niobic acid and TT phase niobium oxide, higher C<SUB>9</SUB>-C<SUB>15</SUB> products' selectivity (>60%) was obtained with the latter catalysts.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Various Nb<SUB>2</SUB>O<SUB>5</SUB> phase were synthesized by calcining niobic acid at 500°C–1000°C. </LI> <LI> XRD and Raman spectroscopy can distinguish the different Nb<SUB>2</SUB>O<SUB>5</SUB> phases. </LI> <LI> The furfuryl alcohol dehydration reaction are significantly affected by Nb<SUB>2</SUB>O<SUB>5</SUB> phases. </LI> <LI> The mixed T&H phase Nb<SUB>2</SUB>O<SUB>5</SUB> showed higher furfuryl alcohol conversion. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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