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Cover of Kamilla's Thesis

Kamila Koichumanova promoted October 7th, 2015

Many industrial processes produce large quantities of waste water containing all kinds of chemicals. These contaminated water streams can be used to produce hydrogen gas with help of catalysts without vaporizing the water. However, the conversion of the available chemicals into hydrogen is a difficult process, and in order to make it efficient, a detailed understanding of the chemical reactions taking place on the surface of the catalyst is required. A device, designed by Kamila Koichumanova from UT research institute MESA+, can supply important new information about this process. It enables scientists to observe what happens at the catalyst surface during the reaction in liquid water, so that they are able to improve the catalyst and the conditions of the reaction. ... read more

Cover of Thesis Jie Zhu

Jie Zhu promoted September 16th, 2015

This thesis describes the preparation of stable CNF layers depositing on the surface of titania extrudate (CNF/TiO2) and cordierite monolith (CNF/TiO2/monolith) and their application as catalyst supports for selective hydrogenation of citral, cinnamaldehyde (CAL) and 4-carboxybenzaldehyde (4-CBA). ... read more

Cover of thesis

Hrudya Nair promoted January 29th, 2015

The subject of this thesis is the direct synthesis of well-adhesive carbon nanofiber (CNF) layers via thermal catalytic chemical vapor deposition. The aim is to grow spatially uniform CNF layers with controllable morphology and controllable wettability on Si based Ni thin film substrates. This thesis also discusses the evaporation of water droplets on this CNFs as well as the impact of droplets and the subsequent spreading behavior on heated CNF surfaces. The results of these investigations are summarized in this chapter and an outlook is formulated. ... read more

Thesis cover of Yingnan Zhao

Yingnan Zhao promoted January 15th, 2015

Nitrate and nitrite contamination of groundwater is threatening the safety for supply of
drinking water in many areas all over the world, mainly caused by over-fertilization in modern
agriculture. Catalytic nitrate hydrogenation has been developed as an efficient and inexpensive
way to remove nitrate and nitrite contamination in drinking water. In these reactions, nitrate
can be reduced to nitrogen (N2) using bimetallic hydrogenation catalysts, with nitrite as an
intermediate product and ammonium as by-product. Pd catalysts have been found most
efficient for nitrite hydrogenation. A high selectivity to N2 of the catalyst is required, because
ammonium is also harmful in drinking water. ... read more