The Experts below are selected from a list of 150 Experts worldwide ranked by ideXlab platform
Jong-san Chang - One of the best experts on this subject based on the ideXlab platform.
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A Shape-Selective Catalyst for epoxidation of cyclic olefins: The nanoporous nickel phosphate VSB-5
Journal of Catalysis, 2006Co-Authors: Sung Hwa Jhung, Jin-ho Lee, Anthony K. Cheetham, Gérard Férey, Jong-san ChangAbstract:Nickel in the form of porous nickel phosphate VSB-5 has been used as a Shape-Selective Catalyst for epoxidation of cyclic olefins such as cyclohexene and cyclooctene using hydrogen peroxide. The VSB-5 showed high selectivity to cyclohexene oxide and cyclohexane diol, much higher productivity per Catalyst weight in the epoxidation of cyclohexene, and high selectivity to cyclooctene oxide in the epoxidation of cyclooctene. The VSB-5 behaved as a heterogeneous Catalyst in the epoxidation and can be used many times without structure degradation, leaching of active nickel species, or significant activity loss. It has been concluded that the epoxidation reaction with VSB-5 proceeds via a free-radical mechanism by taking into consideration a sharp activity loss in the presence of a radical scavenger, hydroquinone. The effect of radical scavengers with different molecular dimension on the catalytic activity also indicates the shape selectivity in the pores of VSB-5.
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A Shape-Selective Catalyst for epoxidation of cyclic olefins: The nanoporous nickel phosphate VSB-5
Journal of Catalysis, 2006Co-Authors: Sung Hwa Jhung, Jin-ho Lee, Anthony K. Cheetham, Gérard Férey, Jong-san ChangAbstract:Nickel in the form of porous nickel phosphate VSB-5 has been used as a Shape-Selective Catalyst for epoxidn. of cyclic olefins such as cyclohexene and cyclooctene using hydrogen peroxide. The VSB-5 showed high selectivity to cyclohexene oxide and cyclohexane diol, much higher productivity per Catalyst wt. in the epoxidn. of cyclohexene, and high selectivity to cyclooctene oxide in the epoxidn. of cyclooctene. The VSB-5 behaved as a heterogeneous Catalyst in the epoxidn. and can be used many times without structure degrdn., leaching of active nickel species, or significant activity loss. It has been concluded that the epoxidn. reaction with VSB-5 proceeds via a free-radical mechanism by taking into consideration a sharp activity loss in the presence of a radical scavenger, hydroquinone. The effect of radical scavengers with different mol. dimension on the catalytic activity also indicates the shape selectivity in the pores of VSB-5. [on SciFinder (R)]
Sung Hwa Jhung - One of the best experts on this subject based on the ideXlab platform.
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A Shape-Selective Catalyst for epoxidation of cyclic olefins: The nanoporous nickel phosphate VSB-5
Journal of Catalysis, 2006Co-Authors: Sung Hwa Jhung, Jin-ho Lee, Anthony K. Cheetham, Gérard Férey, Jong-san ChangAbstract:Nickel in the form of porous nickel phosphate VSB-5 has been used as a Shape-Selective Catalyst for epoxidation of cyclic olefins such as cyclohexene and cyclooctene using hydrogen peroxide. The VSB-5 showed high selectivity to cyclohexene oxide and cyclohexane diol, much higher productivity per Catalyst weight in the epoxidation of cyclohexene, and high selectivity to cyclooctene oxide in the epoxidation of cyclooctene. The VSB-5 behaved as a heterogeneous Catalyst in the epoxidation and can be used many times without structure degradation, leaching of active nickel species, or significant activity loss. It has been concluded that the epoxidation reaction with VSB-5 proceeds via a free-radical mechanism by taking into consideration a sharp activity loss in the presence of a radical scavenger, hydroquinone. The effect of radical scavengers with different molecular dimension on the catalytic activity also indicates the shape selectivity in the pores of VSB-5.
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A Shape-Selective Catalyst for epoxidation of cyclic olefins: The nanoporous nickel phosphate VSB-5
Journal of Catalysis, 2006Co-Authors: Sung Hwa Jhung, Jin-ho Lee, Anthony K. Cheetham, Gérard Férey, Jong-san ChangAbstract:Nickel in the form of porous nickel phosphate VSB-5 has been used as a Shape-Selective Catalyst for epoxidn. of cyclic olefins such as cyclohexene and cyclooctene using hydrogen peroxide. The VSB-5 showed high selectivity to cyclohexene oxide and cyclohexane diol, much higher productivity per Catalyst wt. in the epoxidn. of cyclohexene, and high selectivity to cyclooctene oxide in the epoxidn. of cyclooctene. The VSB-5 behaved as a heterogeneous Catalyst in the epoxidn. and can be used many times without structure degrdn., leaching of active nickel species, or significant activity loss. It has been concluded that the epoxidn. reaction with VSB-5 proceeds via a free-radical mechanism by taking into consideration a sharp activity loss in the presence of a radical scavenger, hydroquinone. The effect of radical scavengers with different mol. dimension on the catalytic activity also indicates the shape selectivity in the pores of VSB-5. [on SciFinder (R)]
Jayesh J. Nair - One of the best experts on this subject based on the ideXlab platform.
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isomerization of citronellal to isopulegol using eclectically engineered sulfated zirconia carbon molecular sieve composite Catalysts udcat 2
Langmuir, 2000Co-Authors: Ganapati Yadav D And, Jayesh J. NairAbstract:Sulfated zirconia (S−ZrO2) is a well-known solid superacid used as a Catalyst in various reactions of commercial importance such as isomerization, Friedel−Crafts alkylation and acylation, nitration, cracking, esterification, etc. S−ZrO2, per se, is not a Shape-Selective Catalyst. The selectivity toward the formation of the desired product can be greatly enhanced by eclectically designing a Shape-Selective Catalyst by a synergistic combination between S−ZrO2 and carbon molecular sieves (CMS). The paper presents the novelty of the combination of S−ZrO2 and CMS, designated as UDCaT-2, as a Shape-Selective Catalyst in the cyclization of citronellal to isopulegol which has industrial value. UDCaT-2 was found to be the best Catalyst, among others, for the selective cyclization of citronellal to isopulegol wherein the shape selectivity can be tailored by proper pretreatment. The conversion and selectivity were found to be the maximum at 95 °C. The formation of isopulegol was found to be dependent on the average ...
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Isomerization of Citronellal to Isopulegol Using Eclectically Engineered Sulfated Zirconia−Carbon Molecular Sieve Composite Catalysts, UDCaT-2
Langmuir, 2000Co-Authors: Ganapati D. Yadav And, Jayesh J. NairAbstract:Sulfated zirconia (S−ZrO2) is a well-known solid superacid used as a Catalyst in various reactions of commercial importance such as isomerization, Friedel−Crafts alkylation and acylation, nitration, cracking, esterification, etc. S−ZrO2, per se, is not a Shape-Selective Catalyst. The selectivity toward the formation of the desired product can be greatly enhanced by eclectically designing a Shape-Selective Catalyst by a synergistic combination between S−ZrO2 and carbon molecular sieves (CMS). The paper presents the novelty of the combination of S−ZrO2 and CMS, designated as UDCaT-2, as a Shape-Selective Catalyst in the cyclization of citronellal to isopulegol which has industrial value. UDCaT-2 was found to be the best Catalyst, among others, for the selective cyclization of citronellal to isopulegol wherein the shape selectivity can be tailored by proper pretreatment. The conversion and selectivity were found to be the maximum at 95 °C. The formation of isopulegol was found to be dependent on the average ...
Gérard Férey - One of the best experts on this subject based on the ideXlab platform.
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A Shape-Selective Catalyst for epoxidation of cyclic olefins: The nanoporous nickel phosphate VSB-5
Journal of Catalysis, 2006Co-Authors: Sung Hwa Jhung, Jin-ho Lee, Anthony K. Cheetham, Gérard Férey, Jong-san ChangAbstract:Nickel in the form of porous nickel phosphate VSB-5 has been used as a Shape-Selective Catalyst for epoxidation of cyclic olefins such as cyclohexene and cyclooctene using hydrogen peroxide. The VSB-5 showed high selectivity to cyclohexene oxide and cyclohexane diol, much higher productivity per Catalyst weight in the epoxidation of cyclohexene, and high selectivity to cyclooctene oxide in the epoxidation of cyclooctene. The VSB-5 behaved as a heterogeneous Catalyst in the epoxidation and can be used many times without structure degradation, leaching of active nickel species, or significant activity loss. It has been concluded that the epoxidation reaction with VSB-5 proceeds via a free-radical mechanism by taking into consideration a sharp activity loss in the presence of a radical scavenger, hydroquinone. The effect of radical scavengers with different molecular dimension on the catalytic activity also indicates the shape selectivity in the pores of VSB-5.
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A Shape-Selective Catalyst for epoxidation of cyclic olefins: The nanoporous nickel phosphate VSB-5
Journal of Catalysis, 2006Co-Authors: Sung Hwa Jhung, Jin-ho Lee, Anthony K. Cheetham, Gérard Férey, Jong-san ChangAbstract:Nickel in the form of porous nickel phosphate VSB-5 has been used as a Shape-Selective Catalyst for epoxidn. of cyclic olefins such as cyclohexene and cyclooctene using hydrogen peroxide. The VSB-5 showed high selectivity to cyclohexene oxide and cyclohexane diol, much higher productivity per Catalyst wt. in the epoxidn. of cyclohexene, and high selectivity to cyclooctene oxide in the epoxidn. of cyclooctene. The VSB-5 behaved as a heterogeneous Catalyst in the epoxidn. and can be used many times without structure degrdn., leaching of active nickel species, or significant activity loss. It has been concluded that the epoxidn. reaction with VSB-5 proceeds via a free-radical mechanism by taking into consideration a sharp activity loss in the presence of a radical scavenger, hydroquinone. The effect of radical scavengers with different mol. dimension on the catalytic activity also indicates the shape selectivity in the pores of VSB-5. [on SciFinder (R)]
Jin-ho Lee - One of the best experts on this subject based on the ideXlab platform.
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A Shape-Selective Catalyst for epoxidation of cyclic olefins: The nanoporous nickel phosphate VSB-5
Journal of Catalysis, 2006Co-Authors: Sung Hwa Jhung, Jin-ho Lee, Anthony K. Cheetham, Gérard Férey, Jong-san ChangAbstract:Nickel in the form of porous nickel phosphate VSB-5 has been used as a Shape-Selective Catalyst for epoxidation of cyclic olefins such as cyclohexene and cyclooctene using hydrogen peroxide. The VSB-5 showed high selectivity to cyclohexene oxide and cyclohexane diol, much higher productivity per Catalyst weight in the epoxidation of cyclohexene, and high selectivity to cyclooctene oxide in the epoxidation of cyclooctene. The VSB-5 behaved as a heterogeneous Catalyst in the epoxidation and can be used many times without structure degradation, leaching of active nickel species, or significant activity loss. It has been concluded that the epoxidation reaction with VSB-5 proceeds via a free-radical mechanism by taking into consideration a sharp activity loss in the presence of a radical scavenger, hydroquinone. The effect of radical scavengers with different molecular dimension on the catalytic activity also indicates the shape selectivity in the pores of VSB-5.
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A Shape-Selective Catalyst for epoxidation of cyclic olefins: The nanoporous nickel phosphate VSB-5
Journal of Catalysis, 2006Co-Authors: Sung Hwa Jhung, Jin-ho Lee, Anthony K. Cheetham, Gérard Férey, Jong-san ChangAbstract:Nickel in the form of porous nickel phosphate VSB-5 has been used as a Shape-Selective Catalyst for epoxidn. of cyclic olefins such as cyclohexene and cyclooctene using hydrogen peroxide. The VSB-5 showed high selectivity to cyclohexene oxide and cyclohexane diol, much higher productivity per Catalyst wt. in the epoxidn. of cyclohexene, and high selectivity to cyclooctene oxide in the epoxidn. of cyclooctene. The VSB-5 behaved as a heterogeneous Catalyst in the epoxidn. and can be used many times without structure degrdn., leaching of active nickel species, or significant activity loss. It has been concluded that the epoxidn. reaction with VSB-5 proceeds via a free-radical mechanism by taking into consideration a sharp activity loss in the presence of a radical scavenger, hydroquinone. The effect of radical scavengers with different mol. dimension on the catalytic activity also indicates the shape selectivity in the pores of VSB-5. [on SciFinder (R)]