Heterogeneous hydrogenation catalysts

Navalikhina, M. D.; Крылов, О. В.

doi:10.1070/rc1998v067n07abeh000413

Cited by 66 publications

(18 citation statements)

References 213 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CO 2 is known to be formed by, among others, the decarboxylation of the organic acids in the PL feed and particularly from formic acid [9]. CH 4 is either from gas phase reactions like the methanation of CO 2 and CO [48] or from liquid phase reactions, for instance by gasification of organics [49] and demethoxylation of the lignin fractions in the PL feed [25]. Methanation by gas phase reactions is an undesired reaction as it reduces the carbon efficiency of the process and leads to higher consumption levels of (expensive) hydrogen.…”

Section: Product Distributionmentioning

confidence: 99%

Mono-, bi-, and tri-metallic Ni-based catalysts for the catalytic hydrotreatment of pyrolysis liquids

Wang

Venderbosch

et al. 2017

Biomass Conv. Bioref.

View full text Add to dashboard Cite

Catalytic hydrotreatment is a promising technology to convert pyrolysis liquids into intermediates with improved properties. Here, we report a catalyst screening study on the catalytic hydrotreatment of pyrolysis liquids using bi-and tri-metallic nickel-based catalysts in a batch autoclave (initial hydrogen pressure of 140 bar, 350°C, 4 h). The catalysts are characterized by a high nickel metal loading (41 to 57 wt%), promoted by Cu, Pd, Mo, and/or combination thereof, in a SiO 2 , SiO 2 -ZrO 2 , or SiO 2 -Al 2 O 3 matrix. The hydrotreatment results were compared with a benchmark Ru/C catalyst. The results revealed that the monometallic Ni catalyst is the least active and that particularly the use of Mo as the promoter is favored when considering activity and product properties. For Mo promotion, a product oil with improved properties viz. the highest H/C molar ratio and the lowest coking tendency was obtained. A drawback when using Mo as the promoter is the relatively high methane yield, which is close to that for Ru/C. 1 H, 13 C-NMR, heteronuclear single quantum coherence (HSQC), and two-dimensional gas chromatography (GC × GC) of the product oils reveal that representative component classes of the sugar fraction of pyrolysis liquids like carbonyl compounds (aldehydes and ketones and carbohydrates) are converted to a large extent. The pyrolytic lignin fraction is less reactive, though some degree of hydrocracking is observed.

show abstract

Section: Product Distributionmentioning

confidence: 99%

Mono-, bi-, and tri-metallic Ni-based catalysts for the catalytic hydrotreatment of pyrolysis liquids

Wang

Venderbosch

et al. 2017

Biomass Conv. Bioref.

View full text Add to dashboard Cite

show abstract

“…The catalysts based on NiO (sample 8) and Co 3 O 4 (sample 10) differed from the other systems (Fig. 8) methanation of carbon oxides CO (IV) and CO 2 (V) [57] formed during the hydrocracking of oils. Water gas reaction (VI) is also possible under these condi tions [3]: CO + 3H 2 → CH 4 + H 2 O (IV), CO 2 + 4H 2 → CH 4 + 2H 2 O (V), CO 2 + H 2 → CO + H 2 O (VI).…”

Section: Effect Of the Nature Of A Hydrogenation Component On The Maimentioning

confidence: 91%

Hydrocracking of vegetable oil on boron-containing catalysts: Effect of the nature and content of a hydrogenation component

et al. 2016

View full text Add to dashboard Cite

Catalysts based on metals (Pt, Pd) and metal oxides (NiO, Co 3 O 4 , MoO 3 , WO 3 ), supported on the surface of borate containing aluminum oxide (B 2 O 3 -Al 2 O 3 ), in the hydrocracking of sunflower oil at a tem perature of 400°C, a pressure 4.0 MPa and a mass hourly space velocity MHSV 5.0 h -1 are compared. H 2 TPR and IR spectroscopy of adsorbed CO and ESDR show that the hydrogenation catalyst components are Pt 0 and Pd 0 , a mixture of Ni 2+ + Ni 0 , Co 2+ + Co 0 , or a mixture of the highest and partially reduced oxides of Mo and W. It is established that catalysts containing Pt, Pd, NiO and Co 3 O 4 , ensure complete oil hydrode oxygenation. The main oxygen removal reactions in Pt and Pd systems are decarboxylation and hydrode carbonylation. For catalysts with NiO and Co 3 O 4 , characteristic reactions are reduction and methanation. The highest yield of the diesel fraction was obtained on Pt/B 2 O 3 Al 2 O 3 catalysts with metal contents of 0.3-1.0 wt %. Along with n alkanes, the diesel fractions obtained on these catalysts include cycloalkanes and iso alkanes (up to around 40 wt %) and aromatic hydrocarbons present in trace amounts. Hydrocracking on the Pt system at 400°C for 20 h with MHSV of 1.0 h -1 produces a diesel fraction with a yield of at least 82.0 wt % and the content of iso alkanes at least 76.1 wt %.

show abstract

“…It has been previously reported that the strength of olefin adsorption on catalyst surfaces determines the kinetics of platinum-catalyzed hydrogenation [84]. The strength of olefin adsorption would be expected to decrease with an increase in catalyst temperature, which would explain the observed decrease in activation energy for each catalyst.…”

Section: Pe-pthmcm-41mentioning

confidence: 92%

Acid‐Catalyzed Cracking of Polyolefins: Primary Reaction Mechanisms

White

2006

Feedstock Recycling and Pyrolysis of Waste Plastics

View full text Add to dashboard Cite

Heterogeneous hydrogenation catalysts

Cited by 66 publications

References 213 publications

Mono-, bi-, and tri-metallic Ni-based catalysts for the catalytic hydrotreatment of pyrolysis liquids

Mono-, bi-, and tri-metallic Ni-based catalysts for the catalytic hydrotreatment of pyrolysis liquids

Hydrocracking of vegetable oil on boron-containing catalysts: Effect of the nature and content of a hydrogenation component

Acid‐Catalyzed Cracking of Polyolefins: Primary Reaction Mechanisms

Contact Info

Product

Resources

About