Effect of water on Cu/Zn catalyst for hydrogenation of fatty methyl ester to fatty alcohol

Abstract

The effect of water on Cu/Zn catalyst prepared by co-precipitation for hydrogenation of methyl laurate in a slurry phase was studied using a stirred autoclave reactor system. The catalysts were characterized by means of XRD, BET, H 2 -TPR, SEM and TEM. The results indicate that catalytic activity decreases with increased amount of water in methyl laurate. Correlating with the results from the above characterization, it is found that the main causes for the water deactivation of the Cu/Zn catalyst were the water occlusion of active catalyst sites by the low solubility of water in the substrate and the promotion of crystal growth, as well as the Cu/Zn catalyst agglomeration in the presence of water.

Heterogeneous and homogeneous catalysis for the hydrogenation of carboxylic acid derivatives: history, advances and future directions

“…Finally, the performance of Cu/ZnO catalysts in the hydrogenation of methyl laurate can also be impeded in the presence of water. 70 The occlusion of active sites, crystallite size growth, and the agglomeration of Cu/Zn particles were proposed to be responsible for deactivation.…”

Influence of Calcination Temperature on the Performance of Cu-Al-Ba Catalyst for Hydrogenation of Esters to Alcohols

“…[17] andLi [13] etal.haveobtained similarresultsandsuggestedthatincreasingthecalcinationtem鄄 peratureto800 益 ledimmediatelytoBa鄄aluminateformation.It isworthnotingthatnoAlcontainingphaseisdetectedexcept Cu鄄Al鄄Ba鄄750,thisisrelatedtotheamorphousphaseofAl 2 O 3 confirmedbyTEM鄄EDS鄄SAEDstudiesbelow.Li etal. [18] have obtainedsimilarresultsthatattemperaturesupto700 益 ,the [23] .Meanwhile,itisnowwidelyacceptedthatme鄄 talliccopperparticlesprovidetheactivesitesforthereaction [24][25][26][27] . Sincethecatalystisactivatedat300 益 whichismuchhigherthan itsreductiontemperaturebeforeitsapplicationforthereactionat 240 益,metalliccoppercanbeconfirmedasactivesitesforthe hydrogenation.…”

Diatomite-supported Pd–M (M = Cu, Co, Ni) bimetal nanocatalysts for selective hydrogenation of long-chain aliphatic esters

“…Since copper-containing catalysts allow for selective hydrogenation of carbon-oxygen double bond and are relatively inactive in carbon-carbon double bond hydrogenation, they have been used in the hydrogenation of the esters or acids [4]. As one of the best Cr-free catalysts, Cu-Zn-based catalysts are widely applied in the production of natural fatty alcohols [5][6][7]. In addition, the catalysts based on noble metals such as Ru and Rh have been investigated for the selective hydrogenation of long-chain esters [8][9][10][11][12][13][14][15][16].…”