Modifying irregular titania powders in a low power microwave plasma torch

IF 4.4 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2004-08-09 DOI:10.1002/aic.10244

Ganesh Vanamu, Kelvin Lester, Abhaya K. Datye, John C. Weigle, Chun-Ku Chen, Daniel Kelly, Jonathan Phillips

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引用次数: 4

Abstract

Rapid passage of titania powder as an aerosol through a plasma generated with a low power microwave torch, resulted in many changes to the powder. Some or all of the titania became spherical, its phase changed, the level of carbon impurity changed, and its surface area declined. The final state of the titania depended on plasma operating conditions. For example, all of the titania became spherical and converted to the rutile phase, only if the processing rate remained low. Complete spherodization occurred only if the energy absorbed by the particles was <2.5% of the total power applied. Excess solid loading reduced the fraction spherodized or otherwise modified, as well as the net rate of conversion. Passing titania through an oxygen plasma removed virtually all the carbon impurity. This process is similar to alumina studies in the same apparatus and suggests that many refractory oxides can be modified by low-power plasmas. © 2004 American Institute of Chemical Engineers AIChE J, 50: 2090–2100, 2004

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在低功率微波等离子体炬中改性不规则钛粉

二氧化钛粉末作为气溶胶通过低功率微波炬产生的等离子体，导致粉末的许多变化。部分或全部二氧化钛呈球形，其相发生变化，碳杂质含量发生变化，其表面积下降。二氧化钛的最终状态取决于等离子体的操作条件。例如，所有的二氧化钛都变成球形并转化为金红石相，只有在加工速率保持较低的情况下。只有当粒子吸收的能量为所施加总功率的2.5%时，才会发生完全球化。过量的固体负荷降低了球化或其他改性的分数，以及净转化率。将二氧化钛通过氧等离子体除去几乎所有的碳杂质。这一过程类似于在同一设备上对氧化铝的研究，表明许多难熔氧化物可以通过低功率等离子体进行修饰。©2004美国化学工程师学会化学工程学报，50:2090-2100,2004

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.