نتایج جستجو برای: zro2

تعداد نتایج: 3340  

2016
Paisan Kongkachuichay Busaya Chamnankid Karin Föttinger Günther Rupprechter

Ni–CeO2–ZrO2 Catalysts for Water Gas Shift Reaction: Effect of CeO2

1998
Ronald S. Gordon James R. Heflin

ii Nanocomposite of ZrO2/Polymer Thin-film Coatings by The Ionically Self-Assembled Monolayer Technique

Journal: :Journal of the Ceramic Society of Japan 2021

The effect of crystal structure Y-doped ZrO2 as support on the three-way catalytic performance Rh catalyst was investigated. supported 3Y-ZrO2 with tetragonal phase showed higher activity than that 3Y/ZrO2 monoclinic phase. difference in Rh–support oxide interaction suspected from measurements temperature-programmed reduction by CO (CO-TPR). use found to contribute formation easily reducible sp...

Journal: :journal of ultrafine grained and nanostructured materials 2015
rahman fazli farhad golestani-fard

cazro3 nanoceramics were successfully synthesized at 700 c using the molten salt method, and the effects of processing parameters, such as temperature, holding time, and amount of salt on the crystallization of cazro3 were investigated. cacl2, na2co3, and nano-zro2 were used as starting materials. on heating, cacl2–nacl molten eutectic salt provided a liquid medium for the reaction of caco3 an...

2016
Kresimir Anic Astrid Wolfbeisser Hao Li Christoph Rameshan Karin Föttinger Johannes Bernardi Günther Rupprechter

Ni nanoparticles supported on ZrO2 are a prototypical system for reforming catalysis converting methane to synthesis gas. Herein, we examine this catalyst on a fundamental level using a 2-fold approach employing industrial-grade catalysts as well as surface science based model catalysts. In both cases we examine the atomic (HRTEM/XRD/LEED) and electronic (XPS) structure, as well as the adsorpti...

2004
Haichao Liu Enrique Iglesia

H5PV2Mo10O40 polyoxometallate Keggin clusters supported on ZrO2, TiO2, SiO2, and Al2O3 are effective catalysts for CH3OH oxidation reactions to form HCHO, methyl formate (MF), and dimethoxymethane (DMM). Rates and selectivities and the structure of supported clusters depend on the surface properties of the oxide supports. Raman spectroscopy showed that Keggin structures remained essentially int...

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Austenitic stainless steels are high performance steels that have various applications in solid oxide fuel cells and boiler tubes under high temperature operating conditions. The Cr2O3 oxide layer formed on the steel surface becomes unstable at high temperatures and reduces the oxidation resistance of the steel. Therefore, protection of these steels at high temperatures is essential. Therefore,...

Journal: Nanochemistry Research 2019

Here, we successfully developed the undoped, Ni2+, Cu2+, and Zn2+ doped Zirconia nanoparticles (ZrO2 NPs) by a simple co-precipitation method at room temperature and characterized by various physicochemical measurement techniques to investigate their structure, morphology, and sizes of the particles. The bandgap energy values of doped and undoped ZrO2 NPs were estimated using optical absorption...

Journal: :Journal of composites science 2022

In recent years, functionalized metal oxides have been gaining popularity for biomass conversion to fuels and chemicals due the global energy crisis. This study reports a novel catalyst based on noble immobilization zirconia that has successfully used in production of biofuel alkyl levulinates (ALs) from lignocellulosic biomass-derived levulinic acid (LA) under vapor-phase. The wet impregnation...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یزد - دانشکده علوم پایه 1393

در این پایان‏نامه مشتقات پیران و پیریدین در حضور کاتالیست‏های اسیدی جامد بر پایه سیلیکای مزوپور سنتز شده‏اند. کاتالیست zro2/fe3o4@ mcm-41 سولفاته شده (so42-/zro2/fe3o4@ mcm-41) در شرایط مختلف سنتز شده است و مشخصات آن با روش‎های ft-ir، xrd و sem تعیین گردیده است. نتایج به‏دست آمده نشان‎دهنده وجود ساختار مزوپور کاتالیست است. فعالیت کاتالیستی so42-/zro2/fe3o4@ mcm-41 با نسبت 9/1 si/zr=و 5/1si/...

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