Oxidative dehydrogenation of ethane with carbon dioxide over Cr2O3/SBA-15 catalysts: the influence of sulfate modification of the support

IF 0.125 Applied Petrochemical Research Pub Date : 2017-09-20 DOI:10.1007/s13203-017-0182-5

P. Thirumala Bai, S. Srinath, K. Upendar, T. V. Sagar, N. Lingaiah, K. S. Rama Rao, P. S. Sai Prasad

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引用次数: 11

Abstract

Unmodified and sulfate-modified SBA-15-supported Cr₂O₃ catalysts were prepared by impregnation method. The physico-chemical properties of the supports and catalysts were determined by nitrogen adsorption/desorption, powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), laser-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–Vis diffuse reflectance spectroscopy (UV-DRS), inductively coupled plasma optical emission spectroscopy (ICP-OES), transmission electron microscopy (TEM) and temperature-programmed reduction (TPR) techniques. Oxidative dehydrogenation of ethane to ethylene (ODE) with CO₂ as oxidant was carried out on these catalysts in a fixed-bed reactor at temperatures in the range of 600–700?°C and at atmospheric pressure. The changes in structural and textural properties because of sulfate modification were identified. Sulfate modification affected the nature of interaction of CrO_x species with the SBA-15 support. During the evaluation, it was observed that sulfate modification enhances ethane conversion and ethylene selectivity of the catalyst. Better dispersion of CrO_x and the increase in Cr⁶⁺/Cr³⁺ ratio seem to be the reasons for the higher performance of the sulfate-modified catalysts compared to that of the unmodified catalyst.

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Cr2O3/SBA-15催化剂上乙烷氧化脱氢:硫酸盐改性对载体的影响

采用浸渍法制备了未改性和硫酸盐改性的sba -15负载Cr2O3催化剂。采用氮吸附/脱附、粉末x射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、激光拉曼光谱、x射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-DRS)、电感耦合等离子体发射光谱(ICP-OES)、透射电子显微镜(TEM)和程序升温还原(TPR)等技术对载体和催化剂的理化性质进行了表征。在固定床反应器中，在600 ~ 700℃的温度范围内，以CO2为氧化剂，在这些催化剂上进行了乙烷氧化脱氢制乙烯(ODE)。°C和大气压下。确定了硫酸盐改性后结构和织构性能的变化。硫酸盐改性影响了CrO - x与SBA-15载体相互作用的性质。在评价过程中，硫酸盐改性提高了催化剂的乙烷转化率和乙烯选择性。与未改性催化剂相比，硫酸盐改性催化剂具有更好的CrO x分散性和Cr6+/Cr3+比值的提高。

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Applied Petrochemical Research ENGINEERING, CHEMICAL-

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0.00%

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审稿时长

13 weeks

期刊介绍： Applied Petrochemical Research is a quarterly Open Access journal supported by King Abdulaziz City for Science and Technology and all the manuscripts are single-blind peer-reviewed for scientific quality and acceptance. The article-processing charge (APC) for all authors is covered by KACST. Publication of original applied research on all aspects of the petrochemical industry focusing on new and smart technologies that allow the production of value-added end products in a cost-effective way. Topics of interest include: • Review of Petrochemical Processes • Reaction Engineering • Design • Catalysis • Pilot Plant and Production Studies • Synthesis As Applied to any of the following aspects of Petrochemical Research: -Feedstock Petrochemicals: Ethylene Production, Propylene Production, Butylene Production, Aromatics Production (Benzene, Toluene, Xylene etc...), Oxygenate Production (Methanol, Ethanol, Propanol etc…), Paraffins and Waxes. -Petrochemical Refining Processes: Cracking (Steam Cracking, Hydrocracking, Fluid Catalytic Cracking), Reforming and Aromatisation, Isomerisation Processes, Dimerization and Polymerization, Aromatic Alkylation, Oxidation Processes, Hydrogenation and Dehydrogenation. -Products: Polymers and Plastics, Lubricants, Speciality and Fine Chemicals (Adhesives, Fragrances, Flavours etc...), Fibres, Pharmaceuticals.