Zeolite-Supported Ni and Mo Catalysts for Hydrotreatments

Li, Dien; Nishijima, Akio; Morris, David E.

doi:10.1006/jcat.1998.2326

Cited by 64 publications

(33 citation statements)

References 38 publications

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“…The USY supported Ni-Mo catalyst had a much higher HDS activity than other zeolite-supported catalysts, which is attributed to both the highly dispersed Ni and/or Mo sulfide species in supercavities and possibly in sodalite cages of a USY zeolite. 172,173 Hydrocracking catalysts generally contain ultrastable Y zeolite in the rare-earth exchanged form, which are more resistant to the catalyst poisons (nitrogen bases, heavy metals, etc.). Zeolites in H form are less resistant to catalyst poisons but are more active in cracking reactions.…”

Section: Perspectives On the Use Of Zeolite For Hydroprocessingmentioning

confidence: 99%

On the Use of Acid-Base-Supported Catalysts for Hydroprocessing of Heavy Petroleum

Leyva

Rana

Trejo

et al. 2007

Ind. Eng. Chem. Res.

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The environmental regulation pressure is being increased to reduce precursors of pollution contaminants (sulfur, nitrogen, and aromatics) in fuels to lower levels. There are various processes to upgrade heavy and extraheavy crude oils, such as solvent deasphalting, thermal conversion, catalytic conversion, distillation, and hydroprocessing. Hydroprocessing not only upgrades the crude oil but also produces synthetic crude oil that has a lower impurities content and a higher liquid yield of products. The fuels upgrading currently is achieved in refinery hydroprocessing units using different new-generation catalysts, along with several modifications of process conditions such as multistage reactors, type of catalyst loading, and reactor internals. However, it has been widely recognized that, for deep removal of these contaminants by hydroprocessing, research must be more oriented to the catalyst developments, rather than the process conditions. Actual commercial catalysts are based on well-known and studied active metals (CoMo, NiMo) and support (Al 2 O 3 ). In addition, extensive research work has been performed with other supports (Al 2 O 3 -TiO 2 , Al 2 O 3 -ZrO 2 , etc.). Nevertheless, other promising acidic materials, such as zeolites, have received relatively less attention, and experimental reports on their use as part of the heavy oil hydroprocessing catalyst support are scarce in the literature. The objective of this contribution is then to discuss the use of acidic and/or basic materials as a support for the hydroprocessing catalyst, specifically for their possible application for the hydroprocessing of heavy oils, in cases where the desired product selectivity is toward gasoline and middle distillates.

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Section: Perspectives On the Use Of Zeolite For Hydroprocessingmentioning

confidence: 99%

On the Use of Acid-Base-Supported Catalysts for Hydroprocessing of Heavy Petroleum

Leyva

Rana

Trejo

et al. 2007

Ind. Eng. Chem. Res.

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“…2, displaying two peaks at 350 and 477°C, but equivalent concentration of weak and strong acid forces, respectively, 43.6% and 56.4%. On the contrary, the IR results of pyridine presented greater amount of Lewis acids sites (12.5 lmol/mg) than Brönsted sites (0.2 lmol/mg), in contradiction with the TPD of ammonia results and Li's observation [17]. This contradiction is probably due to different techniques, because ammonia is a strong basic molecule and easily adsorbed on acids sites, while pyridine is a weak basic molecule and adsorbed specifically on acids sites.…”

Section: Acidity-nh 3 and Pyridinementioning

confidence: 53%

“…The amount of NH 3 desorbed on the HZSM5 zeolite is larger than on NaZSM5 (Table 2). According to Li et al [17] the desorption around 307°C would be assigned to weak acid sites, due to Lewis sites, while that located around 357-407°C and 467-507°C are assigned to medium and strong sites, respectively, which are attributed to the adsorption on Brönsted acids sites.…”

Section: Acidity-nh 3 and Pyridinementioning

confidence: 99%

NO x reduction by ethanol on Pd/zeolites-effect of oxygen

2008

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The reduction of NO by ethanol on palladium catalysts supported on NaZSM-5 and HZSM-5 zeolites was studied. Temperature programmed techniques, such as desorption of ethanol, NO and surface reaction (TPSR) analyses, besides NH 3 (NH 3 -TPD), as well as, FTIR after pyridine adsorption were used to accomplish reaction products and surface properties. Results show that NaZ-SM5 and HZSM5 present different amounts of Lewis and Brönsted acid sites, which affect strongly the carbon product distribution, but not the nitrogen selectivity. NO reaction with ethanol in the presence of oxygen occurs only over the metal and is independent of the acid sites.

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“…Among these approaches, support modification is an important one [2,3]. Wide variety of materials such as zeolites [4,5], Oxides such as SiO 2 [6], TiO 2 [7,8], ZrO 2 [9][10][11][12], Carbon [13] and mesoporous materials like mesoporous alumina [14], hexagonal mesoporous silica [15], MCM-41 [16][17][18], SBA-15 [19,20], KIT-6 [21], FSM-16 [22], mesoporous carbon [23] have been studied as supports for hydrotreating catalysts.…”

Section: Introductionmentioning

confidence: 99%

Influence of Frame Connectivity of SBA-15 and KIT-6 Supported NiMo Catalysts for Hydrotreating of Gas Oil

et al. 2010

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The feasibility of mesoporous silica as support to NiMo catalysts for hydrotreating of gas oil derived from Athabasca bitumen was tested in a trickle bed reactor at industrial conditions. High quality two dimensional (2D) hexagonal SBA-15 and three dimensional (3D) cubic KIT-6 supports were prepared by sol-gel method. The supports and catalysts were characterized by different characterization techniques such as N 2 physisorption, X-ray diffraction (XRD), Temperature programmed reduction (TPR), and DRIFT spectroscopy. The XRD and N 2 adsorption-desorption analysis shows the stability of structure after metal loadings. Presence of high NiMoS centres which is responsible for higher hydrotreating activities in KIT-6 supported catalysts is demonstrated by DRIFT spectroscopic analysis. HDN and HDS activities of NiMo catalysts supported on SBA-15 and KIT-6 were studied using coker light gas oil at temperature, pressure and LHSV of 370°C, 8.8 MPa and 2.0 h -1 , respectively. KIT-6 supported catalysts shows much higher hydrodesulfurization (HDS) and Hydrodenitrogenation(HDN) activities compared to SBA-15 counterpart due to the fact that 3D-interconnected mesopores caused better dispersion of active species and faster diffusion of reactants and products.

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Zeolite-Supported Ni and Mo Catalysts for Hydrotreatments

Cited by 64 publications

References 38 publications

On the Use of Acid-Base-Supported Catalysts for Hydroprocessing of Heavy Petroleum

On the Use of Acid-Base-Supported Catalysts for Hydroprocessing of Heavy Petroleum

NO x reduction by ethanol on Pd/zeolites-effect of oxygen

Influence of Frame Connectivity of SBA-15 and KIT-6 Supported NiMo Catalysts for Hydrotreating of Gas Oil

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