Selective Hydrogenation of Cinnamaldehyde over Pt/ZrO2 Catalyst Modified by Cr, Mn, Fe, Co and Ni

Abstract

Hydrogenation properties of cinnamaldehyde (CMA) have been studied over Pt/ZrO 2 and PtM/ZrO 2 catalysts (M = Cr, Mn, Fe, Co and Ni) in ethanol at 343 K and 2.0 MPa. The effect of different content of Ni and base has also been investigated over PtNi/ZrO 2 catalyst. With introduction of transition metals to Pt/ZrO 2 catalyst shows a significant influence on the catalytic properties. PtCo/ZrO 2 catalysts show the best yield of cinnamyl alcohol (CMO), and PtNi/ZrO 2 catalyst shows good yield of hydrocinnamaldehyde (HCMA). In the presence of base solution, rate of the hydrogenation of CMA over PtNi/ZrO 2 (0.4 wt%) catalyst increases significantly and side reaction is remarkably inhibited. More bare metal atoms situated remote from the interface region on PtNi/ZrO 2 catalyst surface are the reason of good selectivity of HCMA for PtNi/ZrO 2 catalyst.

Biphasic catalysis using amphiphilic polyphenols-chelated noble metals as highly active and selective catalysts

“…Further hydrogenation of these two intermediates results in the formation of hydrocinnamyl alcohol (HCOL). Although the hydrogenation of C = C bond in α-β unsaturated aldehydes is both kinetically and thermodynamically more favorable than that of the C = O group24, the 100% selective hydrogenation of CAL to HCAL is quite difficult.…”

Selective Hydrogenation of Cinnamaldehyde to Cinnamal Alcohol over Platinum/Graphene Catalysts

“…[1,4] Moreover, acetals and other unidentified high-molecular-weight compounds can also be produced in large quantities in these reactions. [4,5] Although much research has already been focused on this issue, the selective hydrogenation of a,b-unsaturated aldehydes remains a challenge.…”

“…[1][2][3] For instance, the hydrogenation of cinnamaldehyde (CAL) can produce cinnamal alcohol (COL), hydrocinnamaldehyde (HALD), and/or hydrocinnamal alcohol (HALC; Scheme 1), but the selective production of COL is difficult because the hydrogenation of the C=C bond is thermodynamically favored over that of the C=O moiety. [1,4] Moreover, acetals and other unidentified high-molecular-weight compounds can also be produced in large quantities in these reactions. [4,5] Although much research has already been focused on this issue, the selective hydrogenation of a,b-unsaturated aldehydes remains a challenge.The selective hydrogenation of a,b-unsaturated aldehydes toward the unsaturated alcohol can be achieved with homogeneous catalysts such as metal hydrides, aluminium isopropoxide, and others.…”

“…[1,4] Moreover, acetals and other unidentified high-molecular-weight compounds can also be produced in large quantities in these reactions. [4,5] Although much research has already been focused on this issue, the selective hydrogenation of a,b-unsaturated aldehydes remains a challenge.The selective hydrogenation of a,b-unsaturated aldehydes toward the unsaturated alcohol can be achieved with homogeneous catalysts such as metal hydrides, aluminium isopropoxide, and others. [6,7] However, it is desirable to develop an equal-ly selective heterogeneous catalyst as these are easier to handle and separate from the products.…”

Synthesis of ZrO2:Fe nanostructures with visible-light driven H2 evolution activity

“…Developing junction material systems with synergic benets from individuals is of great signicance. [12][13][14][15] However, due to the hybridization of the atomic orbital, almost all of the metal dopants in ZrO 2 would reduce the energy level of CBM. [5][6][7] Furthermore, the hybrid system needs many photocatalysis materials, which have the conduction band minimum (CBM) and valence band maximum (VBM) in a variety of energy levels to create bandstructure matched hybrid composites.…”