Effect of pH in the preparation of ZnFe2O4 for oxidative dehydrogenation of n-butene to 1,3-butadiene: Correlation between catalytic performance and surface acidity of ZnFe2O4

Lee, Howon; Jung, Ji Chul; Kim, Hee‐Soo; Chung, Young-Min; Kim, Tae Jin; Lee, Seong Jun; Oh, Seung-Hoon; Kim, Yong Seung; Song, In Kyu

doi:10.1016/j.catcom.2007.10.023

Cited by 45 publications

(19 citation statements)

References 25 publications

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“…The correlation clearly shows that the yield for 1,3-butadiene increased with increasing surface acidity of the catalyst. This result is well consistent with the previous results reporting that the surface acidity of the catalyst is one of the crucial factors affecting the catalytic performance in the oxidative dehydrogenation of n-butene [14,15,19,22]. Among the catalysts tested, the zinc ferrite catalyst prepared at pH = 8 with the largest surface acidity showed the best catalytic performance.…”

Section: Correlation Between Catalytic Performance and Surface Aciditysupporting

confidence: 94%

“…Each phase was identified by its characteristic diffraction peaks using JCPDS. Zinc ferrite catalyst prepared at pH = 6 retained a mixed phase of a-Fe 2 O 3 and ZnFe 2 O 4 , while a pure zinc ferrite (ZnFe 2 O 4 ) phase was formed in the catalysts prepared at pH = 7-12, in good agreement with the previous result [19]. The Fe/Zn atomic ratios of the catalysts prepared at different pH are summarized in Table 2.…”

Section: Formation Of Zinc Ferrite (Znfe 2 O 4 ) Catalystssupporting

confidence: 81%

“…In our previous work [19], it was revealed that the catalytic performance of zinc ferrite in the oxidative dehydrogenation of n-butene strongly depended on the pH value employed during the co-precipitation step. This indicates that the precise control of pH value during the co-precipitation step is very important in the preparation of zinc ferrite catalyst for oxidative dehydrogenation of n-butene.…”

Section: Introductionmentioning

confidence: 99%

“…In the conventional co-precipitation method, the metal precursor solution (acidic solution) and sodium hydroxide solution (basic solution) are simultaneously added into distilled water for the preparation of zinc ferrite catalyst [23,24]. The pH value during co-precipitation step has also been adjusted by controlling the injection rate of two solutions [19,25]. However, controlling the pH value during the co-precipitation step in a conventional method is difficult and less reproducible, because the pH value is highly sensitive to the acid and base strength of precursor solutions.…”

Section: Introductionmentioning

confidence: 99%

“…However, many researchers agree that acid property of the catalyst is one of the crucial factors determining the catalytic performance in the oxidative dehydrogenation of n-butene [14][15][16][17], because the reaction follows the reaction mechanism by way of p-allyl intermediate [11,14,18,19]. It is generally accepted that the initial hydrogen abstraction step from n-butene to form p-allyl intermediate is the rate-determining step in the oxidative dehydrogenation of n-butene.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of ZnFe2O4 Catalysts by a Co-precipitation Method Using Aqueous Buffer Solution and Their Catalytic Activity for Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene

et al. 2007

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Zinc ferrite (ZnFe 2 O 4 ) catalysts were prepared by a co-precipitation method using aqueous buffer solution with different pH (pH = 6-12), and applied to the oxidative dehydrogenation of n-butene to 1,3-butadiene. Conversion of n-butene and yield for 1,3-butadiene showed volcanoshaped curves with respect to pH value employed during the co-precipitation step. NH 3 -TPD experiments were conducted to correlate the acid property with the catalytic performance of zinc ferrite catalysts. It was revealed that the catalytic performance of zinc ferrite catalysts in the oxidative dehydrogenation of n-butene was closely related to the surface acidity of the catalysts. Conversion of n-butene and yield for 1,3-butadiene increased with increasing surface acidity of the catalysts. Among the catalysts tested, the zinc ferrite catalyst prepared at pH = 8 showed the best catalytic performance in the oxidative dehydrogenation of n-butene, which was attributed to its largest surface acidity.

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Section: Correlation Between Catalytic Performance and Surface Aciditysupporting

confidence: 94%

Section: Formation Of Zinc Ferrite (Znfe 2 O 4 ) Catalystssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of ZnFe2O4 Catalysts by a Co-precipitation Method Using Aqueous Buffer Solution and Their Catalytic Activity for Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene

et al. 2007

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Oxidative Dehydrogenation of But‐1‐ene at Low Temperature with Copper Ferrite Catalysts

Kiyokawa

Ikenaga

2018

ChemistrySelect

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Oxidative dehydrogenation (ODH) reactions of but-1-ene with copper and iron oxide catalysts were carried out with a fixedbed flow reactor in a temperature range of 230-350 8C at 1-C 4 H 8 (mL/min)/O 2 (mL/min) flow ratios of 5/1, 5/2.5, 5/4, and 5/5 for 100 min. When CuFe 2 O 4 /AC prepared in the presence of activated carbon at a molar ratio of Cu/Fe = 1/2 was used for the ODH under reaction conditions of 270 8C and 1-C 4 H 8 /O 2 = 5/ 5, the highest BD (buta-1,3-diene) yield of 15% for 100 min was achieved. When the usability of the CuFe 2 O 4 structure was evaluated, it was clarified that the ODH and complete oxidation proceeded on copper oxides. In addition, CuFe 2 O 4 /AC mainly advanced the ODH, while CuO and Cu 2 O promoted the complete oxidation. CuFe 2 O 4 /AC catalyst showed the good catalytic performance in the ODH of but-1-ene at a low temperature of 270 8C. According to XRD and XPS analyses of CuFe 2 O 4 /AC, CuO/AC, and Cu 2 O before and after the reaction, most of the crystalline CuO phase changed to the Cu 2 O phase during the ODH, and the Cu 2 O phase was maintained in the ODH. These results indicated that complete oxidation occurred with the Cu 2 O phase. In the case of CuFe 2 O 4 /AC, although Cu species in CuFe 2 O 4 were also reduced to Cu 2 O, many CuFe 2 O 4 structures and Cu 2 + species were maintained. This suggested that the maintenance of the CuFe 2 O 4 structure and Cu 2 + species is important in the production of BD.[a] T.

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Oxidative Dehydrogenation of C4 Raffinate-3 to 1,3-Butadiene in a Dual-bed Reaction System Comprising ZnFe2O4 and Co9Fe3Bi1Mo12O51 Catalysts: A Synergistic Effect of ZnFe2O4 and Co9Fe3Bi1Mo12O51 Catalysts

et al. 2008

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Oxidative dehydrogenation of C 4 raffinate-3 to 1,3-butadiene was carried out in a dual-bed reaction system comprising ZnFe 2 O 4 and Co 9 Fe 3 Bi 1 Mo 12 O 51 catalysts in order to investigate a synergistic effect of these two catalysts. Conversion of n-butene and yield for 1,3-butiadene obtained in a dual-bed reaction system comprising ZnFe 2 O 4 (first-bed) and Co 9 Fe 3 Bi 1 Mo 12 O 51 (second-bed) were higher than those obtained in a single-bed reaction system using either ZnFe 2 O 4 or Co 9 Fe 3 Bi 1 Mo 12 O 51 . 1-Butene-TPD and 2-butene-TPD measurements revealed that ZnFe 2 O 4 catalyst retained more selective oxygen species for the reaction with 2-butene than for the reaction with 1-butene, while Co 9 Fe 3 Bi 1 Mo 12 O 51 catalyst retained more selective oxygen species for the reaction with 1-butene than for the reaction with 2-butene. The synergistic effect of ZnFe 2 O 4 (first-bed) and Co 9 Fe 3 Bi 1 Mo 12 O 51 (second-bed) catalysts in the oxidative dehydrogenation of C 4 raffinate-3 was attributed to the combination of high catalytic activity of ZnFe 2 O 4 for 2-butene and high catalytic activity of Co 9 Fe 3 Bi 1 Mo 12 O 51 for 1-butene.

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Effect of pH in the preparation of ZnFe2O4 for oxidative dehydrogenation of n-butene to 1,3-butadiene: Correlation between catalytic performance and surface acidity of ZnFe2O4

Cited by 45 publications

References 25 publications

Preparation of ZnFe2O4 Catalysts by a Co-precipitation Method Using Aqueous Buffer Solution and Their Catalytic Activity for Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene

Preparation of ZnFe2O4 Catalysts by a Co-precipitation Method Using Aqueous Buffer Solution and Their Catalytic Activity for Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene

Oxidative Dehydrogenation of But‐1‐ene at Low Temperature with Copper Ferrite Catalysts

Oxidative Dehydrogenation of C4 Raffinate-3 to 1,3-Butadiene in a Dual-bed Reaction System Comprising ZnFe2O4 and Co9Fe3Bi1Mo12O51 Catalysts: A Synergistic Effect of ZnFe2O4 and Co9Fe3Bi1Mo12O51 Catalysts

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