Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane

Vanadium phosphate catalysts were synthesized via VOPO42H2O and were calcined in two different hydrocarbon reaction environments, i.e.n-butane/air and propane/air. Both catalysts are denoted VPDB and VPDP, respectively. Both catalysts exhibited a good crystalline with characteristic peaks of pyroph...

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Main Authors:	Yap, Taufiq Yun Hin, Saw, Chaing Shen
Format:	Article
Language:	English
Published:	Elsevier 2008
Online Access:	http://psasir.upm.edu.my/id/eprint/6205/ http://psasir.upm.edu.my/id/eprint/6205/ http://psasir.upm.edu.my/id/eprint/6205/ http://psasir.upm.edu.my/id/eprint/6205/1/Effect%20of%20different%20calcination%20environments%20on%20the%20vanadium%20phosphate%20catalysts%20for%20selective%20oxidation%20of%20propane%20and%20n.pdf

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spelling	upm-62052016-11-25T07:47:01Z http://psasir.upm.edu.my/id/eprint/6205/ Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane Yap, Taufiq Yun Hin Saw, Chaing Shen Vanadium phosphate catalysts were synthesized via VOPO42H2O and were calcined in two different hydrocarbon reaction environments, i.e.n-butane/air and propane/air. Both catalysts are denoted VPDB and VPDP, respectively. Both catalysts exhibited a good crystalline with characteristic peaks of pyrophosphate phase. However, the peaks for VPDP are shown to be more prominent than those of VPDB. BET surface area showed that VPDB gave higher surface area (23 m2 g1) compared to VPDP (18 m2 g1). The average V valence state for VPDP is 4.08 and the higher V valence state for VPDB is 4.26 due to higher amount of VV for VPDB. Furthermore 14.2% of VIII was found for VPDP but none for VPDB. SEM micrographs clearly revealed that the morphologies of both catalysts composed of plate-like crystallite that was arranged into the characteristic of rosette cluster. However, the catalyst calcined in n-butane/air environment (VPDB) resulted in an increment of the amount of plate-like crystal formed in the rosette rosebud agglomerates. TPR in H2 profiles of both catalysts gave two reduction peaks corresponding to two kinetically different oxygen species which were associated with VVand VIV phases, respectively. VPDB removed larger amount of active oxygen species linked to VIV phase which eventually caused a higher conversion rate in the selective oxidation of n-butane and propane to maleic anhydride and acrylic acid, respectively. Elsevier 2008 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/6205/1/Effect%20of%20different%20calcination%20environments%20on%20the%20vanadium%20phosphate%20catalysts%20for%20selective%20oxidation%20of%20propane%20and%20n.pdf Yap, Taufiq Yun Hin and Saw, Chaing Shen (2008) Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane. Catalysis Today, 131 (1-4). pp. 285-291. ISSN 0920-5861 http://dx.doi.org/10.1016/j.cattod.2007.10.091 10.1016/j.cattod.2007.10.091
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Putra Malaysia
building	UPM Institutional Repository
collection	Online Access
language	English
description	Vanadium phosphate catalysts were synthesized via VOPO42H2O and were calcined in two different hydrocarbon reaction environments, i.e.n-butane/air and propane/air. Both catalysts are denoted VPDB and VPDP, respectively. Both catalysts exhibited a good crystalline with characteristic peaks of pyrophosphate phase. However, the peaks for VPDP are shown to be more prominent than those of VPDB. BET surface area showed that VPDB gave higher surface area (23 m2 g1) compared to VPDP (18 m2 g1). The average V valence state for VPDP is 4.08 and the higher V valence state for VPDB is 4.26 due to higher amount of VV for VPDB. Furthermore 14.2% of VIII was found for VPDP but none for VPDB. SEM micrographs clearly revealed that the morphologies of both catalysts composed of plate-like crystallite that was arranged into the characteristic of rosette cluster. However, the catalyst calcined in n-butane/air environment (VPDB) resulted in an increment of the amount of plate-like crystal formed in the rosette rosebud agglomerates. TPR in H2 profiles of both catalysts gave two reduction peaks corresponding to two kinetically different oxygen species which were associated with VVand VIV phases, respectively. VPDB removed larger amount of active oxygen species linked to VIV phase which eventually caused a higher conversion rate in the selective oxidation of n-butane and propane to maleic anhydride and acrylic acid, respectively.
format	Article
author	Yap, Taufiq Yun Hin Saw, Chaing Shen
spellingShingle	Yap, Taufiq Yun Hin Saw, Chaing Shen Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane
author_facet	Yap, Taufiq Yun Hin Saw, Chaing Shen
author_sort	Yap, Taufiq Yun Hin
title	Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane
title_short	Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane
title_full	Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane
title_fullStr	Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane
title_full_unstemmed	Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane
title_sort	effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane
publisher	Elsevier
publishDate	2008
url	http://psasir.upm.edu.my/id/eprint/6205/ http://psasir.upm.edu.my/id/eprint/6205/ http://psasir.upm.edu.my/id/eprint/6205/ http://psasir.upm.edu.my/id/eprint/6205/1/Effect%20of%20different%20calcination%20environments%20on%20the%20vanadium%20phosphate%20catalysts%20for%20selective%20oxidation%20of%20propane%20and%20n.pdf
first_indexed	2018-09-07T12:26:25Z
last_indexed	2018-09-07T12:26:25Z
_version_	1610951620954161152

Effect of different calcination environments on the vanadium phosphate catalysts for selective oxidation of propane and n-butane

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