Xylose {is a|is really a|is actually a|can be a|is often a|is usually a} {major|significant|main|key|big|important} {component|element} of hemicelluloses. {In this|Within this} paper, its hydrogenation to xylitol in aqueous medium wasinvestigated with two Ru/TiO2 catalysts {prepared|ready} with two {commercial|industrial} TiO2 supports. A {strong|powerful|robust|sturdy} {impact|influence|effect} of {support|assistance|help} on catalytic performances was evidenced. Ru/TiO2-R led to {fast|quick|quickly|rapidly|rapid|speedy} and selective conversion of xylose ({100|one hundred} % conversion in {2|two} h at 120°C with 99 % selectivity) whereas Ru/TiO2-A gave a slower and {much|a lot|significantly|considerably|substantially|a great deal} {less|much less|significantly less} selective transformation (58 % conversion in {4|four} h at 120°C with 17 % selectivity) {with the|using the|with all the|together with the} formation of {several|a number of|numerous|many|various|quite a few} by-products. Detailed characterization of catalysts with ICP, XRD, FTIR, TEM, H2 chemisorption, N2 porosimetry, TPR and acid-base titration {were|had been|have been} performed to elucidate the {role|function|part} of {each|every|each and every|every single} {support|assistance|help}.TiO2-R {has a|features a|includes a} {small|little|tiny|modest|smaller|compact} {specific|particular|certain|distinct|precise} surface {area|region|location} with {large|big|huge|massive|substantial|significant} ruthenium nanoparticles in weak interaction with TiO2 {support|assistance|help} and no acidity, whereas TiO2-A {is a|is really a|is actually a|can be a|is often a|is usually a} mesoporous material {with a|having a|using a} {large|big|huge|massive|substantial|significant} {specific|particular|certain|distinct|precise} surface {area|region|location}, mildly acidic, and bears {small|little|tiny|modest|smaller|compact} ruthenium particles in {strong|powerful|robust|sturdy} interaction with TiO2 {support|assistance|help}. The former was {very|extremely|really|quite|incredibly|pretty} active and selective for xylose hydrogenation to xylitol whereas the latter was {less|much less|significantly less} active and poorly selective. {Moreover|Furthermore|In addition|Additionally}, {careful|cautious} {analysis|evaluation} of reaction {products|goods|items|merchandise|solutions} also revealed that TiO2 anatase can catalyze undesired side-reactions {such as|like|including|for example|for instance|which include} xylose isomerisation to {various|numerous|different|a variety of|several|many} pentoses, and {therefore|consequently|as a result|for that reason|thus|hence} thecorresponding unexpected polyols (arabitol, ribitol) {were|had been|have been} {produced|created|made|developed} {during|throughout|in the course of|for the duration of|through} xylose conversion by hydrogenation. {In a|Inside a|Within a} {first|initial|very first|1st|initially} {approach|method|strategy} {of the|from the|in the|on the|with the|of your} kinetics, a simplified kinetic model was {built|constructed} to {compare|evaluate|examine} quantitatively intrinsic reaction {rates|prices} of {both|each} catalysts. The kinetic {constant|continuous|continual} for hydrogenation was 20 {times|occasions|instances} {higher|greater|larger} for Ru/TiO2-R at 120°C. Price of 1607838-14-1 1-(2,2,2-Trifluoroethyl)piperazine site PMID:23075432
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