Amit kant - Academia.edu (original) (raw)
Papers by Amit kant
Chemical Engineering Journal, 2017
A series of transition metal oxides (e.g., Ni, Cu, Zn, and Zr) were supported on H-beta with load... more A series of transition metal oxides (e.g., Ni, Cu, Zn, and Zr) were supported on H-beta with loading of 5-20 wt% via wet impregnation. These catalysts were evaluated in the hydrogenolysis of glycerol under aqueous conditions at different reaction temperatures (150-250 o C), times (5-15 h) and H 2 pressures (300-1200 psi). The results from characterization of materials by XRD, FT-IR, N 2 sorption and NH 3-TPD together with the results from the activity test allowed further understanding of the role of transition metals and acid sites on hydrogenolysis of glycerol. The H-beta was found to contain higher Brønsted acidity and catalyst activity compared to those supported metal catalysts. It was found that the acidic properties of the H-Beta zeolite and metal content play a significant role on the final product distribution. The major product over bare H-beta and Zr/H-beta was 1-proponal, while the concentration of 1,2-propanediol and 1,3-propanediol increased significantly by the incorporation of a second metal oxide. A high 1,3-propanediol selectivity of 14% was obtained over the H-beta supported Ni-Zr catalyst at 73% glycerol conversion. The selectivity of 1,2-propanediol and 1,3-propanediol were decreased at higher reaction temperature and time.
ChemSusChem, May 14, 2016
In this work, the development of novel binary and ternary oxide/Torlon hollow fiber composites co... more In this work, the development of novel binary and ternary oxide/Torlon hollow fiber composites comprising zirconia, titania, and silica as amine supports was demonstrated. The resulting binary (Zr-Si/PAI-HF, Ti-Si/PAI-HF) and ternary (Zr-Ti-Si/PAI-HF) composites were then functionalized with monoamine-, diamine-, and triamine-substituted trialkoxysilanes and were evaluated in CO2 capture. Although the introduction of both Zr and Ti improved the CO2 adsorption capacity relative to that with Si/PAI-HF sorbents, zirconia was found to have a more favorable effect on the CO2 adsorption performance than titania, as previously demonstrated for amine sorbents in the powder form. The Zr-Ti-Si/PAI-HF sample with an oxide content of 20 wt % was found to exhibit a relatively high CO2 capacity, that is, 1.90 mmol g(-1) at atmospheric pressure under dry conditions, owing to more favorable synergy between the metal oxides and CO2 . The ternary fiber sorbent showed improved sorption kinetics and lo...
Catalysis Today, 2016
Abstract Propylene is an important constituent of many products that we rely upon in our daily li... more Abstract Propylene is an important constituent of many products that we rely upon in our daily life. This essential raw material is currently produced from fossil-derived feedstocks such as oil and natural gas. However, conversion of bioethanol to propylene represents an interesting opportunity for the utilization of renewable feedstocks such as bioethanol as one of the main biomass-derived products via dehydration process. The catalytic production of propylene from bioethanol has gained significant attention recently as a renewable alternative to conventional technologies. This review will discuss the state-of-the-art on the use of catalytic materials, such as zeolites and transition metals, in catalytic conversion of bioethanol to propylene and related reactions. The corresponding mechanisms are reviewed with emphasis on the possibilities provided by these materials to develop alternative processes for selective production of propylene and other olefins from bioethanol. Important aspects such as catalyst texture and architecture, the impact of promoters and co-feeding water on ethanol to propylene reaction and fundamental understanding of reaction mechanisms involved in ethanol dehydration reaction are discussed accordingly.
Chemical Engineering Journal, 2017
A series of transition metal oxides (e.g., Ni, Cu, Zn, and Zr) were supported on H-beta with load... more A series of transition metal oxides (e.g., Ni, Cu, Zn, and Zr) were supported on H-beta with loading of 5-20 wt% via wet impregnation. These catalysts were evaluated in the hydrogenolysis of glycerol under aqueous conditions at different reaction temperatures (150-250 o C), times (5-15 h) and H 2 pressures (300-1200 psi). The results from characterization of materials by XRD, FT-IR, N 2 sorption and NH 3-TPD together with the results from the activity test allowed further understanding of the role of transition metals and acid sites on hydrogenolysis of glycerol. The H-beta was found to contain higher Brønsted acidity and catalyst activity compared to those supported metal catalysts. It was found that the acidic properties of the H-Beta zeolite and metal content play a significant role on the final product distribution. The major product over bare H-beta and Zr/H-beta was 1-proponal, while the concentration of 1,2-propanediol and 1,3-propanediol increased significantly by the incorporation of a second metal oxide. A high 1,3-propanediol selectivity of 14% was obtained over the H-beta supported Ni-Zr catalyst at 73% glycerol conversion. The selectivity of 1,2-propanediol and 1,3-propanediol were decreased at higher reaction temperature and time.
ChemSusChem, May 14, 2016
In this work, the development of novel binary and ternary oxide/Torlon hollow fiber composites co... more In this work, the development of novel binary and ternary oxide/Torlon hollow fiber composites comprising zirconia, titania, and silica as amine supports was demonstrated. The resulting binary (Zr-Si/PAI-HF, Ti-Si/PAI-HF) and ternary (Zr-Ti-Si/PAI-HF) composites were then functionalized with monoamine-, diamine-, and triamine-substituted trialkoxysilanes and were evaluated in CO2 capture. Although the introduction of both Zr and Ti improved the CO2 adsorption capacity relative to that with Si/PAI-HF sorbents, zirconia was found to have a more favorable effect on the CO2 adsorption performance than titania, as previously demonstrated for amine sorbents in the powder form. The Zr-Ti-Si/PAI-HF sample with an oxide content of 20 wt % was found to exhibit a relatively high CO2 capacity, that is, 1.90 mmol g(-1) at atmospheric pressure under dry conditions, owing to more favorable synergy between the metal oxides and CO2 . The ternary fiber sorbent showed improved sorption kinetics and lo...
Catalysis Today, 2016
Abstract Propylene is an important constituent of many products that we rely upon in our daily li... more Abstract Propylene is an important constituent of many products that we rely upon in our daily life. This essential raw material is currently produced from fossil-derived feedstocks such as oil and natural gas. However, conversion of bioethanol to propylene represents an interesting opportunity for the utilization of renewable feedstocks such as bioethanol as one of the main biomass-derived products via dehydration process. The catalytic production of propylene from bioethanol has gained significant attention recently as a renewable alternative to conventional technologies. This review will discuss the state-of-the-art on the use of catalytic materials, such as zeolites and transition metals, in catalytic conversion of bioethanol to propylene and related reactions. The corresponding mechanisms are reviewed with emphasis on the possibilities provided by these materials to develop alternative processes for selective production of propylene and other olefins from bioethanol. Important aspects such as catalyst texture and architecture, the impact of promoters and co-feeding water on ethanol to propylene reaction and fundamental understanding of reaction mechanisms involved in ethanol dehydration reaction are discussed accordingly.