The influence of phase purity on the stability of Pt/LaAlO3 catalysts in the aqueous phase reforming of glycerol

Inns, Donald R.; Pei, Xuebao; Zhou, Zhen; Irving, D.J.M.; Kondrat, Simon A.

doi:10.1016/j.mtchem.2022.101230

Cited by 5 publications

(3 citation statements)

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“…PdCl 4 2– could be formed by the reaction of Pd(H 2 O) 4 2+ cations (from Pd(NO 3 ) 2 in aqueous dissolution), with chloride anions (from H 2 PtCl 6 ) contributing to augmented Pd dispersion due to positively charged alumina-like domains on SBA-15 under acidic impregnating solutions conditions, being then able to adsorb compensating anions. As already mentioned, impregnation under acidic conditions could affect the stability of used supports, possibly redistributing aluminum species as observed during PtCl 4 impregnation on LaAlO 3 where crystallinity losses were evidenced . In contrast, adsorption on Al entities highly dispersed on the SBA-15 surface (where properties of mesoporous silica predominate) was not favored as the latter could be negatively charged under aforementioned conditions .…”

Section: Resultsmentioning

confidence: 97%

“…As already mentioned, impregnation under acidic conditions could affect the stability of used supports, possibly redistributing aluminum species as observed during PtCl 4 impregnation on LaAlO 3 where crystallinity losses were evidenced. 54 In contrast, adsorption on Al entities highly dispersed on the SBA-15 surface (where properties of mesoporous silica predominate) was not favored as the latter could be negatively charged under aforementioned conditions. 35 Better dispersed NM phases (as those on pristine SBA-15) could originate due to their interaction with enhanced number and strength of acidic sites (either protonic or Lewis, Table S2) on Al-modified SBA-15.…”

Section: Surface Acidity Determinationmentioning

confidence: 99%

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Thioresistant PdPt/Al/SBA-15 for Naphthalene Hydrogenation

Escobar,

Colín-Luna,

Barrera

2024

Ind. Eng. Chem. Res.

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Al-modified (chemical grafting) SBA-15 (SiO 2 / Al 2 O 3 = 5 mass ratio) materials were used as noble metal (NM, monometallic Pt or Pd and bimetallic Pd/Pt = 4, 0.5 wt % loading) carriers. The materials were studied by XRF, N 2 physisorption, XRD, TPR, pyridine thermodesorption FTIR, and STEM (HAADF). Hydrogenating properties were tested in naphthalene (N) conversion; meanwhile, dibenzothiophene (80 ppm) was added in some experiments to evaluate the thioresistance of prepared catalysts. Al-incorporation provided enhanced Lewis and Brønsted acidity to pristine SBA-15 due to alumina-like domains that contributed to Pt dispersion reflected in augmented hydrogenation. The Pt-based catalyst was the most active in N saturation (T = 290 °C, P = 6.97 MPa), whereas the Pd/Pt (4/1) formulation had enhanced thioresistance probably due to NM alloying (electron transfer in Pt-Pd core−shell particles) in conjunction with weak Brønsted acidity (Si−O−Al bonds, electron transfer from NM) that provided additional sites for aromatic adsorption. Enhanced thioresistance is crucial for aromatic saturation of NM catalysts aimed at second-stage polishing of ultralow S diesel.

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Section: Resultsmentioning

confidence: 97%

Section: Surface Acidity Determinationmentioning

confidence: 99%

Thioresistant PdPt/Al/SBA-15 for Naphthalene Hydrogenation

Escobar,

Colín-Luna,

Barrera

2024

Ind. Eng. Chem. Res.

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“…Pt-based catalysts are often used due to their ability to break C-C bonds and their efficiency for SR/WGS reactions [ 16 , 20 ]. Many studies about H 2 production by the APR of glycerol over Pt-based catalysts have been reported [ 21 , 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Renewable Hydrogen Production by Aqueous Phase Reforming of Pure/Refined Crude Glycerol over Ni/Al-Ca Catalysts

Raso,

Abad,

García

et al. 2023

Molecules

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Renewable hydrogen production by aqueous phase reforming (APR) over Ni/Al-Ca catalysts was studied using pure or refined crude glycerol as feedstock. The APR was carried out in a fixed bed reactor at 238 °C, 37 absolute bar for 3 h, using a solution of 5 wt.% of glycerol, obtaining gas and liquid products. The catalysts were prepared by the co-precipitation method, calcined at different temperatures, and characterized before and after their use by several techniques (XRD, ICP-OES, H2-TPR, NH3-TPD, CO2-TPD, FESEM, and N2-physisorption). Increasing the calcination temperature and adding Ca decreased the surface area from 256 to 188 m2/g, and its value after the APR changed depending on the feedstock used. The properties of the acid and basic sites of the catalysts influenced the H2 yield also depending on the feed used. The Ni crystallite was between 6 and 20 nm. In general, the incorporation of Ca into Ni-based catalysts and the increase of the calcination temperature improved H2 production, obtaining 188 mg H2/mol C fed during the APR of refined crude glycerol over Ni/AlCa-675 catalyst, which was calcined at 675 °C. This is a promising result from the point of view of enhancing the economic viability of biodiesel.

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Hydrogen production from aqueous‐phase reforming of glycerol, sorbitol, and glycine over Pt/Al₂O₃ catalyst in a fixed‐bed reactor

Kalekar,

Vaidya

2024

Int J of Chemical Kinetics

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Aqueous‐phase reforming (APR) is an interesting technique for generating hydrogen (H2) from biofeeds. In this work, APR of model compounds of wet biomass for H2 production was investigated. Glycerol, sorbitol, and glycine were the chosen model compounds. They represent polyols and amino acids in wet biomass such as waste sludge and microalgal biomass. The Pt/Al2O3 catalyst was preferred and it was characterized using nitrogen adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), x‐ray diffraction (XRD), and x‐ray photoelectron spectroscopy (XPS) techniques. APR trials were performed in a continuous fixed‐bed reactor. The reaction conditions chosen for this work were: temperature (T) 453–498 K, pressure (P) 1.2–2.4 MPa, feed concentration 5–15 wt%, and weight hourly space velocity (WHSV) 0.15–0.6 g reactant/(g catalyst h). The best conditions for H2 production by the APR process were found to be T = 498 K, P = 2.4 MPa, and feed concentration = 15 wt%. Among the chosen model compounds, glycerol exhibited the highest H2 selectivity (82.7%) and H2 yield (21.6%) at 498 K. The analysis of kinetic data suggested first‐order reaction kinetics for all the model compounds. The values of activation energy for the reactions with glycerol (55.4 kJ/mol), sorbitol (51.6 kJ/mol), and glycine (45.7 kJ/mol) were determined. Thus, APR is a promising route for effectively producing H2‐bearing gaseous products with high heating value from wet biomass.

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The influence of phase purity on the stability of Pt/LaAlO3 catalysts in the aqueous phase reforming of glycerol

Cited by 5 publications

References 65 publications

Thioresistant PdPt/Al/SBA-15 for Naphthalene Hydrogenation

Thioresistant PdPt/Al/SBA-15 for Naphthalene Hydrogenation

Renewable Hydrogen Production by Aqueous Phase Reforming of Pure/Refined Crude Glycerol over Ni/Al-Ca Catalysts

Hydrogen production from aqueous‐phase reforming of glycerol, sorbitol, and glycine over Pt/Al₂O₃ catalyst in a fixed‐bed reactor

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The influence of phase purity on the stability of Pt/LaAlO3 catalysts in the aqueous phase reforming of glycerol

Cited by 5 publications

References 65 publications

Thioresistant PdPt/Al/SBA-15 for Naphthalene Hydrogenation

Thioresistant PdPt/Al/SBA-15 for Naphthalene Hydrogenation

Renewable Hydrogen Production by Aqueous Phase Reforming of Pure/Refined Crude Glycerol over Ni/Al-Ca Catalysts

Hydrogen production from aqueous‐phase reforming of glycerol, sorbitol, and glycine over Pt/Al2O3 catalyst in a fixed‐bed reactor

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Hydrogen production from aqueous‐phase reforming of glycerol, sorbitol, and glycine over Pt/Al₂O₃ catalyst in a fixed‐bed reactor