Catalytic Biomass Gasification to Syngas Over Highly Dispersed Lanthanum‐Doped Nickel on SBA‐15

Oemar, Usman; Kathiraser, Yasotha; Ang, Ming Li; Hidajat, K.; Kawi, Sibudjing

doi:10.1002/cctc.201500482

Cited by 44 publications

(11 citation statements)

References 105 publications

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“…After H 2 reduction at 800 °C for 1 h, there are no more peaks for NiO (Figure ). Instead, typical Ni peaks are observed, which indicates the reduction from NiO to Ni . The crystal size of Ni is calculated to be approximately 4 nm.…”

Section: Resultsmentioning

confidence: 95%

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

2017

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We synthesize a new sandwich‐like silica@Ni@silica multicore–shell catalyst. Firstly, Ni phyllosilicate (NiPS) is supported on silica nanospheres by a simple ammonia evaporation method. Then NiPS is coated with a layer of mesoporous silica to obtain a core–shell NiPS@silica structure by the hydrolysis of tetraethylorthosilicate (TEOS). The thickness of the shell can be tuned by varying the amount of TEOS. After calcination and H2 reduction at high temperature, multiple small Ni nanoparticles (≈6 nm) are generated and supported on the inner silica core but also encapsulated within the outer mesoporous silica shell. This silica@Ni@silica multicore–shell catalyst shows a high and stable conversion (≈60 %, gas hourly space velocity=60 000 mL h−1 gcat−1) for the dry reforming of methane (DRM) at 600 °C, whereas pristine NiPS deactivates quickly because of heavy carbon formation. We investigated the spent catalysts by using thermogravimetric analysis and TEM and found that there is almost no carbon formation for this new multicore–shell catalyst. Compared with a conventional Ni@silica core–shell catalyst, our multicore–shell catalyst is much easier to synthesize and the process does not require any toxic organic solvents. We believe that this strategy to make a multicore–shell catalyst can be applied to more nanomaterials and extended to other catalytic reactions besides DRM.

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Section: Resultsmentioning

confidence: 95%

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

2017

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“…28,29 The H 2 -TPR was performed on the sample (100 mg) up to 600°C and held for 1 hour, followed by cooling down to room temperature under He gas. The pulse amount of N 2 O gas was then injected to the system to oxidize the surface metallic site of the reduced catalyst until saturation.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Sulfur resistant La_xCe_1−xNi_0.5Cu_0.5O₃ catalysts for an ultra-high temperature water gas shift reaction

Oemar

Bian

Hidajat

et al. 2016

Catal. Sci. Technol.

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A series of La x Ce 1−x Ni 0.5 Cu 0.5 O 3 catalysts was synthesized to study the effect of Ce substitution for La. XRD results show that only a small amount of Ce (10%) is allowable to substitute La to maintain the perovskite structure. The La 0.9 Ce 0.1 Ni 0.5 Cu 0.5 O 3 catalyst has the smallest metal particle size and the highest oxygen mobility among all tested catalysts as observed from the XRD, TPD-O 2 , and XPS results of reduced catalysts. These two factors are very important in achieving the highest catalytic activity of the La 0.9 Ce 0.1 Ni 0.5 Cu 0.5 O 3 catalyst in a water gas shift reaction at 450-650°C. In the presence of H 2 S, the catalytic activity at lower temperature was suppressed due to the formation of stable SO 4 2− species on the metal. However, since the amounts of surface oxygen species and adsorbed H 2 S are much lower at high temperature, the formation of SO 4 2− species is not observed, resulting in higher catalytic activity. The presence of H 2 S at high temperature enhances the formation of formate species, which can decompose to produce methane as the side product of the water gas shift reaction. IntroductionThe Water Gas Shift (WGS) reaction is one of the key reactions for hydrogen production in industry. The reaction is favorable at a low reaction temperature due to exothermicity. However, the reaction rate is lower at lower temperatures. Hence, the WGS reaction is industrially performed in two stages, i.e. high temperature WGS at 350-450°C to increase the reaction rate using an Fe-Cr catalyst, followed by low temperature WGS at 200-250°C to convert the remaining CO in the system using a Cu-Zn catalyst. With current growing interest in hydrogen production via biomass gasification technology which produces sulfur containing syngas, it is important to develop a new catalyst having high activity and stability not only at low (200-250°C) and high temperature (350-450°C) WGS reactions but also at ultra high temperatures (500-650°C) in the presence of a wide range of sulfur concentration. It is understood that biomass gasification is usually performed at high temperatures of 700-900°C. The syngas produced from the biomass gasification has a temperature of 700°C while the conventional WGS reaction requires lower reaction temperatures (200-450°C ). Hence, the syngas needs cooling for the reaction to take place, which means energy loss. The ultra high temperature WGS reaction can minimize the energy loss due to cooling of syngas. The consequences of having a sulphur resistant WGS catalyst is that the downstream hydrogen separation process should have sulphur resistant properties as well. Hence, there is growing interest in sulphur resistant H 2 separation membranes. 1 Various types of sulfur-resistant catalysts have been reported in the literature, such as W-based catalysts, 2,3 Mobased catalysts 4-7 lanthanide oxysulfide La 2 O 2 S, 8,9 noble metal catalysts (Rh,10,(11)(12)(13)), and phosphide catalysts. 14 Sulphided CoMo catalysts in promoted and unpromoted systems have been extensively...

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“…Previous studies have shown that SiC as a catalyst support has many advantages under high temperature or strongly exothermic non‐oxidation reactions, e. g. CO 2 hydrogenation . In addition, La 2 O 3 has been regarded as an effective additive to improve the dispersion of active species and thus increased the activity and stability of the catalysts …”

Section: Introductionmentioning

confidence: 99%

Impacts of SiC Carrier and Nickel Precursor of NiLa/support Catalysts for CO₂ Selective Hydrogenation to Synthetic Natural Gas (SNG)

Zheng

Liu

et al. 2017

ChemistrySelect

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The porous silicon carbide (β‐SiC) carrier supported nickel‐lanthanum based catalysts (NiLa/SiC) were synthesized via incipient‐wetness impregnation by using two types of nickel salts as the precursor, for the selective hydrogenation of carbon dioxide (CO2+4H2→CH4+2H2O). The alumina supported catalysts were also prepared and tested for comparison. The samples were characterized using TEM, TPR, XRD, SEM, TG‐DTG techniques. Compared to the Al2O3 supported catalysts, the SiC supported catalysts were more resistant to sintering and carbon deposition due to the high thermal conductivity of SiC support. The relative weak metal‐support interaction on Ni nanoparticles supported on SiC carrier resulted in the easy reduction of active species during the activation process. Meanwhile, the performances of the catalysts prepared from nickel acetate were better than those of using nickel nitrate, while enhanced nickel dispersion and better reducibility of the catalyst from nickel acetate werr evidenced by TEM, TPR and XRD results. Catalytic performances exhibited that Ni−Ac‐La/SiC catalyst possessed the higher activity with 89.4 % conversion of CO2 and almost 100 % selectivity to methane with slight deactivation after 3000 min test under reaction conditions.

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Catalytic Biomass Gasification to Syngas Over Highly Dispersed Lanthanum‐Doped Nickel on SBA‐15

Cited by 44 publications

References 105 publications

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

Sulfur resistant La_xCe_1−xNi_0.5Cu_0.5O₃ catalysts for an ultra-high temperature water gas shift reaction

Impacts of SiC Carrier and Nickel Precursor of NiLa/support Catalysts for CO₂ Selective Hydrogenation to Synthetic Natural Gas (SNG)

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Catalytic Biomass Gasification to Syngas Over Highly Dispersed Lanthanum‐Doped Nickel on SBA‐15

Cited by 44 publications

References 105 publications

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

Sulfur resistant LaxCe1−xNi0.5Cu0.5O3 catalysts for an ultra-high temperature water gas shift reaction

Impacts of SiC Carrier and Nickel Precursor of NiLa/support Catalysts for CO2 Selective Hydrogenation to Synthetic Natural Gas (SNG)

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Sulfur resistant La_xCe_1−xNi_0.5Cu_0.5O₃ catalysts for an ultra-high temperature water gas shift reaction

Impacts of SiC Carrier and Nickel Precursor of NiLa/support Catalysts for CO₂ Selective Hydrogenation to Synthetic Natural Gas (SNG)