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Your search keyword '"Roine, Jorma"' showing total 18 results
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18 results on '"Roine, Jorma"'

10. Catalytic peroxidation of tyrosol using copper containig MCM-22 and MCM-36 zeolite catalysts

Author

Maduna Valkaj, Karolina, Kumar, Narendra, Roine, Jorma, Peurla, Markus, Murzin, Dmitry, and Media-Tryck, Lund University

Subjects
Catalytic peroxidation, tyrosol, MCM-22 and MCM-36 zeolite
Abstract

The objective of this study was to synthesize novel large pore microporous Cu-H-MCM-22 and mesoporous Cu- H-MCM-36 zeolite catalysts and test their catalytic properties in the CWPO of aqueous solutions of the model pollutant tyrosol [1]. Polyphenols such as tyrosol and phenolic acids, phytotoxic and biorefractory compounds are commonly found in the waste effluents from olive oil production industry (OOMW). Catalytic wet peroxide oxidation process (CWPO) is one of the methods that can be used for reducing the toxicity of OOMW under mild conditions and with low en

Published
2016

11. Specific Electrocatalytic Oxidation of Cellulose at Carbon Electrodes Modified by Gold Nanoparticles

Author

Sugano, Yasuhito, Kumar, Narendra, Peurla, Markus, Roine, Jorma, Aho, Atte, Bobacka, Johan, Mikkola, Jyri-Pekka, Sugano, Yasuhito, Kumar, Narendra, Peurla, Markus, Roine, Jorma, Aho, Atte, Bobacka, Johan, and Mikkola, Jyri-Pekka

Abstract

The influence of the size and oxidation state of Au nanoparticles (AuNPs) as electrocatalysts for the electro-oxidation of cellulose was studied. Carbon paper electrodes modified with AuNPs were used as the electrocatalysts for the electro-oxidation of cellulose dissolved in 1.3 m NaOH. The size and oxidation state of the AuNPs were determined by using SEM, TEM, and X-ray photoelectron spectroscopy. Both the size and the oxidation state of the AuNPs were found to influence the electrocatalytic properties of the electrode, as studied by using cyclic voltammetry, square wave voltammetry, and electrochemical impedance spectroscopy. The carbon paper electrodes decorated with AuNPs (less than 25 nm) that consist of metallic Au gave rise to a significantly higher electrocatalytic activity than a bare polycrystalline Au electrode., Bio4Energy

Published
2016
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18. Processing of pharmaceutical materials by electrospraying under reduced pressure.

Author

Nyström, Maija, Murtomaa, Matti, Roine, Jorma, Sandler, Niklas, and Salonen, Jarno

Subjects
BUDESONIDE, AMORPHOUS substances, DISSOLUTION (Chemistry), POROUS materials, PARTICLE size distribution, ATMOSPHERIC pressure, CRYSTALLINITY
Abstract

Context: Electrospraying was used in drug particle production. Objective: The aim of the research was to evaluate the possibilities to produce drug particles with desired pharmaceutical properties by electrospraying. In particular, the effect of drying pressure on particle properties was studied. Materials and methods: A poorly water soluble model drug (budesonide) was dissolved in chloroform, and the solution was atomized by electrospraying. Following this, the charged droplets were neutralized and dried in a drying chamber. The pressure in the drying chamber was varied. The dried particles were collected and analyzed. Results: The pressure reduction had a slight impact on particle size distribution. The particles produced in reduced pressure turned out to be notably more porous than the particles produced in atmospheric pressure. The pressure reduction also affects the degree of crystallinity of the product. The dissolution of the particles produced in reduced pressures was faster to a certain extent than that of the particles produced in atmospheric pressure. Discussion and conclusions: A setup for electrospraying materials in a reduced pressure was presented. The pressure reduction had a notable impact on particle morphology. The possibilities to tailor the particle properties during electrospraying were studied. [ABSTRACT FROM AUTHOR]

Published
2015
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