Aromatics reduction over supported1 platinum catalysts. 3: Effects of catalyst precursors and pretreatment conditions on the performance of palladium-promoted platinum catalysts

Jan, C A; Chang, J R; Lin, T B

doi:10.1021/ie960134e

Title: Aromatics reduction over supported1 platinum catalysts. 3: Effects of catalyst precursors and pretreatment conditions on the performance of palladium-promoted platinum catalysts

Full Record
Other Related Research

Abstract

Fast Fourier transformation infrared spectroscopy was used to characterize the formation of bimetallic interactions of {gamma}-Al{sub 2}O{sub 3}-supported Pd-Pt catalysts. The effects of bimetallic interactions on catalyst performance were examined in long-term stability tests, carried out with a pilot plant under the same operating conditions and feed as those of a commercial diesel hydrotreating process. These tests are the hydrotreating of straight run distillate diesel at 340 C, 580 psig, and H{sub 2}/oil (mol) = 2.5 over a 25 day period. The characterization results indicate that Pd precursors and pretreatment conditions affect Pd-Pt bimetallic interactions in the H{sub 2}-reduced catalysts and the catalyst performance. The Pd-Pt catalysts made from palladium(II) acetate without calcination pretreatment presented a significant Pd-Pt bimetallic interaction, as evidenced by a shift in the infrared absorption peak characteristic of terminal CO ligands adsorbed on the Pt clusters to higher energy, bridging CO on the Pd to lower energy, and a catalytic reduction of palladium(II) acetate by Pt. In contrast, no significant bimetallic interactions were observed for both catalysts made from palladium(II) acetate with a calcination at 450 C in air and from palladium amine. The long-term stability tests further indicate that the Pd-Pt catalysts with bimetallic interactionsmore »« less

Authors:

Jan, C A; Chang, J R ^[1]; Lin, T B ^[2]

National Chung Cheng Univ., Chia-Yi (Taiwan, Province of China). Dept. of Chemical Engineering
Chinese Petroleum Corp., Chia-Yi (Taiwan, Province of China)

Publication Date:: Fri Nov 01 00:00:00 EST 1996

OSTI Identifier:: 404544

Resource Type:: Journal Article

Journal Name:: Industrial and Engineering Chemistry Research

Additional Journal Information:: Journal Volume: 35; Journal Issue: 11; Other Information: PBD: Nov 1996

Country of Publication:: United States

Language:: English

Subject:: 02 PETROLEUM; PLATINUM; CATALYTIC EFFECTS; PALLADIUM; GAS OILS; HYDROGENATION; DENITRIFICATION; DESULFURIZATION; DIESEL FUELS; SYNTHESIS; CATALYSTS; PRECURSOR; CHEMICAL PREPARATION

Citation Formats


                    Jan, C A, Chang, J R, and Lin, T B. Aromatics reduction over supported1 platinum catalysts. 3: Effects of catalyst precursors and pretreatment conditions on the performance of palladium-promoted platinum catalysts.  United States: N. p., 1996. 
        Web.  doi:10.1021/ie960134e.

Copy to clipboard


                    Jan, C A, Chang, J R, & Lin, T B. Aromatics reduction over supported1 platinum catalysts. 3: Effects of catalyst precursors and pretreatment conditions on the performance of palladium-promoted platinum catalysts.  United States.  https://doi.org/10.1021/ie960134e

Copy to clipboard


                    Jan, C A, Chang, J R, and Lin, T B. 1996.  
        "Aromatics reduction over supported1 platinum catalysts. 3: Effects of catalyst precursors and pretreatment conditions on the performance of palladium-promoted platinum catalysts".  United States.  https://doi.org/10.1021/ie960134e.

Copy to clipboard


                    
@article{osti_404544,

  title        = {Aromatics reduction over supported1 platinum catalysts. 3: Effects of catalyst precursors and pretreatment conditions on the performance of palladium-promoted platinum catalysts},

  author       = {Jan, C A and Chang, J R and Lin, T B},

  abstractNote = {Fast Fourier transformation infrared spectroscopy was used to characterize the formation of bimetallic interactions of {gamma}-Al{sub 2}O{sub 3}-supported Pd-Pt catalysts. The effects of bimetallic interactions on catalyst performance were examined in long-term stability tests, carried out with a pilot plant under the same operating conditions and feed as those of a commercial diesel hydrotreating process. These tests are the hydrotreating of straight run distillate diesel at 340 C, 580 psig, and H{sub 2}/oil (mol) = 2.5 over a 25 day period. The characterization results indicate that Pd precursors and pretreatment conditions affect Pd-Pt bimetallic interactions in the H{sub 2}-reduced catalysts and the catalyst performance. The Pd-Pt catalysts made from palladium(II) acetate without calcination pretreatment presented a significant Pd-Pt bimetallic interaction, as evidenced by a shift in the infrared absorption peak characteristic of terminal CO ligands adsorbed on the Pt clusters to higher energy, bridging CO on the Pd to lower energy, and a catalytic reduction of palladium(II) acetate by Pt. In contrast, no significant bimetallic interactions were observed for both catalysts made from palladium(II) acetate with a calcination at 450 C in air and from palladium amine. The long-term stability tests further indicate that the Pd-Pt catalysts with bimetallic interactions have a relatively high selectivity for aromatics reduction and hydrodenitrogenation (HDN), whereas they have a relatively low selectivity for hydrodesulfurization (HDS).},

  doi          = {10.1021/ie960134e},

  url          = {https://www.osti.gov/biblio/404544},
  journal      = {Industrial and Engineering Chemistry Research},
number       = 11,

  volume       = 35,

  place        = {United States},

  year         = {Fri Nov 01 00:00:00 EST 1996},

  month        = {Fri Nov 01 00:00:00 EST 1996}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1021/ie960134e

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Aromatics reduction over supported platinum catalysts. 2: Improvement in sulfur resistance by addition of palladium to supported platinum catalysts

Journal Article Lin, T; Jan, C; Chang, J - Industrial and Engineering Chemistry Research

Supported Pt catalysts were modified by adding a second metal such as Co, Mo, Ni, Re, Ag, and Pd. The effects of a second metal on the sulfur resistance were first investigated by accelerated aging test reactions. The test reactions were hydrogenation of tetralin containing 1,000 ppm sulfur at 280 C, 380 psig, and H{sub 2}/oil (mol) = 2.7. The results indicated that Pd-Pt catalyst had the highest sulfur resistance. Aromatics reduction, hydrodesulfurization, and hydrodenitrogenation of straight run distillate diesel over supported Pt and Pd-Pt catalysts were further examined by long-term stability tests. The operation conditions of these tests aremore »« less
https://doi.org/10.1021/ie00039a019
Influence of heat treatment of bimetallic catalysts on the metal surface of platinum, palladium, and rhenium deposited on aluminum oxide

Journal Article Erokhina, K; Ryashentseva, M; Izmailov, R; ... - Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States)

The influence of heat treatment on recrystallization of Pt, Re, and Pd particles in bimetallic catalysts was investigated by means of a comprehensive procedure developed for determination of the surface areas of Pt and Re. The catalysts were prepared by impregnation. Re was introduced as a rhenic acid solution in the preparation of Re catalysts. Specimens of the reduced catalysts (each 2 g) were placed in porcelain crucibles and calcined for 6 h in a muffle furnace, first at 580/sup 0/C, then for 6 h at 640/sup 0/C after determination of the adsorption characteristics. The specific surface of the metalmore »« less
Simultaneous hydrodenitrogenation of pyridine and hydrodesulfurization of thiophene over carbon-supported platinum metal sulfides

Journal Article Vit, Z; Zdrazil, M - Journal of Catalysis; (USA)

The activity and selectivity in parallel hydrodenitrogenation and hydrodesulfurization of carbon-supported sulfides of Ru, Rh, Pd, Ir, and Pt were evaluated using the simultaneous reaction of pyridine and thiophene at 280 C and under 2 MPa. The properties of these sulfides were also compared with the behavior of commercial Ni-Mo/alumina and Co-Mo/alumina Shell catalysts. The carbon-supported sulfides of platinum metals were better hydrodesulfurization catalysts and much better hydrodenitrogenation catalysts than the commercial bimetallic systems. The HDN/HDS selectivity of the Rh, Ru, and Pd catalysts was similar to the selective of Co-Mo and Ni-Mo systems but the Ir and Pt catalystsmore »« less
https://doi.org/10.1016/0021-9517(89)90129-2
Preparation of metal/zeolite catalysts: Formation of palladium aquocomplexes in the precursor of palladium-mordenite catalysts

Journal Article

Previous research has revealed that the catalytic performance of metal/zeolite catalysts can be significantly modified by exposing the catalyst precursor to H[sub 2]O vapor during the period after calcination, but before reduction. For bimetallic PdCo/NaY catalysts used for CO hydrogenation, the selectivity was changed from predominant production of oxygenates to predominant production of higher hydrocarbons. For Pt/H-mordenite catalysts, this water treatment has been reported to improve the alkane isomerization activity. Although it is certain that Lewis sites are transformed to Bronsted sites by reaction with H[sub 2]O, the activity of the catalyst is affected most when the water is addedmore »« less
Hydrodesulfurization and hydrogenation reactions on noble metal catalysts. 1. Elucidation of the behavior of sulfur on alumina-supported platinum and palladium using the {sub 35}S radioisotope tracer method

Journal Article Kabe, Toshiaki; Qian, Weihua; Hirai, Yosiki; ... - Journal of Catalysis

Hydrodesulfurization (HDS) reactions of {sup 35}S-radioisotope-labeled dibensothiophene (DBT) were carried out over a series of {gamma}-Al{sub 2}O{sub 3}-supported noble-metal-containing catalysts at 5.00 MPa and at 260 and 280 C. The amount of sulfur (S{sub TOTAL}) accommodated on the catalyst and the amount of labile sulfur (S{sub 0}) participating in the reaction were determined using a direct method, the {sup 35}S radioisotope pulse tracer method, which has recently been developed by the authors. It was observed that both S{sub TOTAL} and S{sub 0} increased linearly with an increase in active metal loading. At the same time, it was found that themore »« less
https://doi.org/10.1006/jcat.1999.2742

Similar Records