Location and functions of Zn as a promoter element in the VPO catalysts for n-butane oxidation to maleic anhydride

Yusaku Takita; Katsuyoshi Tanaka; Shiro Ichimaru; Tatsumi Ishihara; Takanori Inoue; Hiromichi Arai

doi:10.1016/0021-9517(91)90118-N

Location and functions of Zn as a promoter element in the VPO catalysts for n-butane oxidation to maleic anhydride

Yusaku Takita, Katsuyoshi Tanaka, Shiro Ichimaru, Tatsumi Ishihara, Takanori Inoue, Hiromichi Arai

Research output: Contribution to journal › Article › peer-review

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Abstract

Location of zinc in the VP0 catalysts containing zinc was examined along the preparation process. The mixture of H₄(VO)₂P₂0₉, (NH₄)₂ZnCl₄, and NH₄ZnPO₄ was formed, when an aqueous solution containing VO²⁺, Zn²⁺, and NH₃0HCI was evaporated to dryness. TG-DTA results of the mixture revealed that (NH₄)₂ ZnCl₄ decomposed to ZnO at 470-570 K and water molecules were eliminated from H₄(VO)₂P₂0₉ to give (VO)2P207 at 670-700 K, then the solid phase reaction between (VO)₂P₂0₇ and ZnO took place at 790-810 K without any loss of the weight. Addition of 10 at.% of ZnO addition to (VO)₂P₂0₇ by mechanical mixing brought about drastic increase in the oxidation rate of the catalyst to VOP0₄. This may be responsible for the increase in the rate of catalytic n-butane oxidation without significant changes in the product distribution observed over the Zn-promoted VP0 catalysts.

Original language	English
Pages (from-to)	347-353
Number of pages	7
Journal	Journal of Catalysis
Volume	130
Issue number	2
DOIs	https://doi.org/10.1016/0021-9517(91)90118-N
Publication status	Published - Jan 1 1991
Externally published	Yes

All Science Journal Classification (ASJC) codes

Catalysis
Physical and Theoretical Chemistry

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10.1016/0021-9517(91)90118-N

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title = "Location and functions of Zn as a promoter element in the VPO catalysts for n-butane oxidation to maleic anhydride",

abstract = "Location of zinc in the VP0 catalysts containing zinc was examined along the preparation process. The mixture of H4(VO)2P209, (NH4)2ZnCl4, and NH4ZnPO4 was formed, when an aqueous solution containing VO2+, Zn2+, and NH30HCI was evaporated to dryness. TG-DTA results of the mixture revealed that (NH4)2 ZnCl4 decomposed to ZnO at 470-570 K and water molecules were eliminated from H4(VO)2P209 to give (VO)2P207 at 670-700 K, then the solid phase reaction between (VO)2P207 and ZnO took place at 790-810 K without any loss of the weight. Addition of 10 at.% of ZnO addition to (VO)2P207 by mechanical mixing brought about drastic increase in the oxidation rate of the catalyst to VOP04. This may be responsible for the increase in the rate of catalytic n-butane oxidation without significant changes in the product distribution observed over the Zn-promoted VP0 catalysts.",

author = "Yusaku Takita and Katsuyoshi Tanaka and Shiro Ichimaru and Tatsumi Ishihara and Takanori Inoue and Hiromichi Arai",

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T1 - Location and functions of Zn as a promoter element in the VPO catalysts for n-butane oxidation to maleic anhydride

AU - Takita, Yusaku

AU - Tanaka, Katsuyoshi

AU - Ichimaru, Shiro

AU - Ishihara, Tatsumi

AU - Inoue, Takanori

AU - Arai, Hiromichi

PY - 1991/1/1

Y1 - 1991/1/1

N2 - Location of zinc in the VP0 catalysts containing zinc was examined along the preparation process. The mixture of H4(VO)2P209, (NH4)2ZnCl4, and NH4ZnPO4 was formed, when an aqueous solution containing VO2+, Zn2+, and NH30HCI was evaporated to dryness. TG-DTA results of the mixture revealed that (NH4)2 ZnCl4 decomposed to ZnO at 470-570 K and water molecules were eliminated from H4(VO)2P209 to give (VO)2P207 at 670-700 K, then the solid phase reaction between (VO)2P207 and ZnO took place at 790-810 K without any loss of the weight. Addition of 10 at.% of ZnO addition to (VO)2P207 by mechanical mixing brought about drastic increase in the oxidation rate of the catalyst to VOP04. This may be responsible for the increase in the rate of catalytic n-butane oxidation without significant changes in the product distribution observed over the Zn-promoted VP0 catalysts.

AB - Location of zinc in the VP0 catalysts containing zinc was examined along the preparation process. The mixture of H4(VO)2P209, (NH4)2ZnCl4, and NH4ZnPO4 was formed, when an aqueous solution containing VO2+, Zn2+, and NH30HCI was evaporated to dryness. TG-DTA results of the mixture revealed that (NH4)2 ZnCl4 decomposed to ZnO at 470-570 K and water molecules were eliminated from H4(VO)2P209 to give (VO)2P207 at 670-700 K, then the solid phase reaction between (VO)2P207 and ZnO took place at 790-810 K without any loss of the weight. Addition of 10 at.% of ZnO addition to (VO)2P207 by mechanical mixing brought about drastic increase in the oxidation rate of the catalyst to VOP04. This may be responsible for the increase in the rate of catalytic n-butane oxidation without significant changes in the product distribution observed over the Zn-promoted VP0 catalysts.

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ER -

Location and functions of Zn as a promoter element in the VPO catalysts for n-butane oxidation to maleic anhydride

Abstract

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