e-journal

Stability and phase transitions of potassium-promoted iron oxide in various gas phase environments

---

Abstract.
Potassium-promoted iron oxide dehydrogenation catalysts are the primary catalysts used for producing
styrene. In this process, a large amount of steam is used and for economic reasons it is desirable to be able
to operate at lower steam/ethylbenzene molar ratios without creating severe short-term deactivation.
To address this issue, it is essential to understand how the catalyst deactivates. In this study, the
stabilities of a-Fe2O3, K-Fe2O3 (10 wt% K+), KFeO2 (30 wt% K+), and a potassium polyferrite mixed phase
(K2Fe10O16/K2Fe22O34) were investigated in different gas phases including H2, CO2, and ethylbenzene.
The effect of simultaneous steam addition was also considered. Thermogravimetric analysis and X-ray
powder diffraction were used to monitor sample weight variation and phase change, respectively. a-
Fe2O3 and K2Fe10O16/K2Fe22O34 were stable in CO2 but not stable in H2. KFeO2 was resistant to H2 but
easily decomposed by CO2. K-Fe2O3 was adversely impacted by both H2 and CO2. The results suggest that
the reduction of the iron oxide in this system was mainly caused by surface deposited carbon instead of
H2. A transformation diagram is proposed for the phase changes of potassium-promoted iron oxide
materials in the reaction-relevant gas phase conditions.

Keywords: Potassium-promoted iron oxide, Ethylbenzene dehydrogenation, Potassium ferrite, Styrene.

---

Ketersediaan

Tidak ada salinan data

Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

-

Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis A: General 354 (2009) 50–56

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

KIMIA

Info Detail Spesifik

-

Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar