Hydrogenation of crude terephthalic acid by supported Pd and Pd–Sn catalysts on functionalized multiwall carbon nanotubes

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.…”

Preparation of multi-walled carbon nanotubes (MWCNT) and graphene oxide (GO) incorporated Cr-TA@SSZ composite metal-organic frameworks and their use as adsorbents for adsorptive removal of TPA, BA, and p-tol from wastewaters

“…A sonochemical treatment procedure oxidized the MWCNTs in a 1:3 (v/v) solution of HNO3 (65%) and H2SO 4 (98%) in an ultrasonic bath maintained at 60 o C for three h. The solution was then diluted in an ice bath for eight h, ltered, and washed under a vacuum using DI water to remove excess acid and solvent until the pH of the ltrate was neutral. The cake was dried in an oven at 60 o C for 24 h [21][22][23].…”

Multiwalled carbon nanotubes/guanidine/Ni (II): A new and effective organometallic catalyst for the green synthesis of pyrazolopyranopyrimidines

“…Carbon nanotubes (CNTs) containing multiwalled (MWCNTs) and single-walled (SWCNT) structures have excellent chemical [23] and mechanical stability, [24] significant thermal conductivity, [25,26] large surface area, [27] and electrical properties, [28] which make them an ideal and potentially useful choice for applications in electronics, [29] optics, [30] catalysis, [31,32] polymer composites, [33] and many others.…”