Investigation of Isobutane Dehydrogenation on CrOx/MCM-41 Catalyst

IF 1.1 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2020-05-30 DOI:10.20450/mjcce.2020.1842
Zuhal Erol, Saliha Kilicarslan, Meltem Doğan
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引用次数: 1

Abstract

The syntheses of MCM-41 (Mobil Composition of Matter No. 41) supported chromium oxide cat-alysts at different chromium concentrations (4–10 % by mass) were carried out hydrothermally. The aim of this study was to determine the effect of chromium concentration in the catalyst structure on the chro-mate types and chromium oxidation states, as well as the activity of the catalyst in the isobutane dehydro-genation reaction. Inactive α-Cr2O3 crystals for isobutane dehydrogenation were shown to increase in the catalyst structure as the chromium loading increased. The highest amount of Cr6+ on the catalyst surface was detected in the catalyst (H4-MCM-41) with 4 % chromium by mass. Catalytic tests (T = 600 °C, P = atmospheric pressure, WHSV = 26 h–1) were performed under fixed bed reactor conditions. The high-est isobutane conversion (~60 %) and selectivity (~80 %) were observed on the H4-MCM-41 catalyst, which had the highest amount of Cr6+ and monochromate structures. Catalyst deactivation was not due to coke deposition but, rather, was caused by the formation of inactive α-Cr2O3 crystal structures.
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CrOx/MCM-41催化剂上异丁烷脱氢反应的研究
采用水热法合成了不同铬浓度(4-10质量%)的MCM-41(Mobil Composition of Matter No.41)负载氧化铬催化剂。本研究的目的是确定催化剂结构中铬浓度对chro mate类型和铬氧化态的影响,以及催化剂在异丁烷脱氢反应中的活性。随着铬负载量的增加,用于异丁烷脱氢的非活性α-Cr2O3晶体在催化剂结构中增加。在铬含量为4%(质量)的催化剂(H4-MCM-41)中检测到催化剂表面Cr6+含量最高。在固定床反应器条件下进行了催化试验(T=600°C,P=大气压,WHSV=26 h–1)。在具有最高Cr6+含量和单色结构的H4-MCM-41催化剂上观察到最高的异丁烷转化率(~60%)和选择性(~80%)。催化剂失活不是由于焦炭沉积,而是由非活性α-Cr2O3晶体结构的形成引起的。
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来源期刊
CiteScore
1.60
自引率
20.00%
发文量
14
审稿时长
>12 weeks
期刊介绍: Macedonian Journal of Chemistry and Chemical Engineering (Mace­d. J. Chem. Chem. Eng.) is an official publication of the Society of Chemists and Technologists of Macedonia. It is a not-for-profit open acess journal published twice a year. The journal publishes ori­ginal scientific papers, short commu­ni­ca­tions, reviews and educational papers from all fields of chemistry, chemical engineering, food technology, biotechnology and material sciences, metallurgy and related fields. The papers pub­lished in the Journal are summarized in Che­mi­cal Abstracts.
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