Selective hydrogenation of 4-carboxybenzaldehyde over palladium catalysts supported with different structural organization

Recovery of Arenes from Polyethylene Terephthalate (PET) over a Co/TiO2 Catalyst

“…4-Methylbenzoic acid was further hydrogenated and sequentially produced 4-methylbenzaldehyde, 4-methylbenzyl alcohol, xylene, and dimethylcyclohexane (Route A). This route is in line with the reaction pathway for TPA hydrogenation over a Pd-based catalyst presented by Tourani et al [42] Differently, the oxygenated ring-hydrogenated products (e. g., cyclohexanecarboxylic acid and cyclohexanedicarboxylic acid) found in earlier studies [39,42] were not observed here. This might be related to the lower hydrogenation activity of the non-noble Co-based catalyst than that of the noble Pd-based ones.…”

“…A similar phenomenon was observed by Li et al, [38] where an aldehyde intermediate (1-octadecanal) was produced during the HDO of stearic acid, which then underwent decarbonylation to heptadecane as a side product. Likewise, Izadi et al [39] reported that the decarbonylation of 4carboxybenzaldehyde to benzoic acid occurred during the hydrogenation of the 4-carboxybenzaldehyde to 4-(hydroxymethyl)benzoic acid. Another possibility is that the carboxylic acid undergoes decarboxylation to transform C 8 to C 7 products, which was established in a previous study over a Nibased catalyst.…”

A Dynamic Heterogeneous Dispersion Model Evaluates Performance of Industrial Catalytic Hydrotreating Systems

“…The developed generic idea can be employed for the behavior analysis of FBRs, regardless of the type of the catalyst. Izadi et al . carried out a research on 0.5 wt % Pd/C catalyst with macrostructured carbon nanofibers aggregates and micronanoporous activated carbons as an alternative for hydropurification of CTA.…”

“…The developed generic idea can be employed for the behavior analysis of FBRs, regardless of the type of the catalyst. Izadi et al 20 carried out a research on 0.5 wt % Pd/C catalyst with macrostructured carbon nanofibers aggregates and micronanoporous activated carbons as an alternative for hydropurification of CTA. It was confirmed that 0.5% Pd/microporous catalyst is able to significantly catalyze the hydrogenation of 4-CBA (4-carboxybenzaldehyde) to p-toluic acid (pta).…”

Morphology-controlled Pd nanocrystals as catalysts in tandem dehydrogenation-hydrogenation reactions

“…More specifically, important breakthroughs have been achieved by using colloidal synthetic strategies that allow the control of the morphology of the nanocrystals in a step previous to their loading on the desired support. [2][3][4] Among noble metals, the outstanding catalytic ability showed by Pd in reactions of different nature, such as hydrogenation/dehydrogenation reactions, [5][6][7][8][9] hydrogen purification, 10,11 organic pollutant removal, 12 and a wide range of organic reactions, [13][14][15] has made it deserving of numerous studies dealing with the control of the Pd nanocrystals morphology. [16][17][18][19][20] Among these reactions, the performances displayed by Pd in dehydrogenation and hydrogenation reactions should be highlighted.…”