Granulation of sol‐gel‐derived nanostructured alumina

Deng, Qiang; Lin, Yanjun

doi:10.1002/aic.690430223

Cited by 53 publications

(34 citation statements)

References 26 publications

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“…Agglomerate strength would depend greatly on the preparation of the compact. Representative data for catalyst agglomerates (see Table 15) suggest they are generally substantially weaker than polycrystalline ceramic materials prepared by high temperature sintering, such as the alumina cited in Figure 27 [163,165,[167][168][169][170][171]. For example, Pham and co-workers [163] found that the breaking strength of a VISTA B alumina agglomerate during uniaxial compaction is in the range of 5-10 MPa-substantially lower than the reported values for heat-treated polycrystalline alumina of 280-550 MPa [165].…”

Section: Compressive Strengths Of Ceramic Materialsmentioning

confidence: 84%

Heterogeneous Catalyst Deactivation and Regeneration: A Review

2015

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Deactivation of heterogeneous catalysts is a ubiquitous problem that causes loss of catalytic rate with time. This review on deactivation and regeneration of heterogeneous catalysts classifies deactivation by type (chemical, thermal, and mechanical) and by mechanism (poisoning, fouling, thermal degradation, vapor formation, vapor-solid and solid-solid reactions, and attrition/crushing). The key features and considerations for each of these deactivation types is reviewed in detail with reference to the latest literature reports in these areas. Two case studies on the deactivation mechanisms of catalysts used for cobalt Fischer-Tropsch and selective catalytic reduction are considered to provide additional depth in the topics of sintering, coking, poisoning, and fouling. Regeneration considerations and options are also briefly discussed for each deactivation mechanism.

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Section: Compressive Strengths Of Ceramic Materialsmentioning

confidence: 84%

Heterogeneous Catalyst Deactivation and Regeneration: A Review

2015

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“…A detailed description of the synthesis of activated alumina adsorbent beads using a modified sol-gel process can be found in our previous publications [18,19]. The sol-gel process started with synthesis of a stable boehmite sol (c-ALOOH) by dissolving alumina-tri-secondary butoxide in deionized water at an initial temperature of 75°C.…”

Section: Preparation Of the Sol-gel-derived Activated Alumina Adsorbentsmentioning

confidence: 99%

Adsorption equilibrium and kinetics of fluoride on sol–gel-derived activated alumina adsorbents

Camacho

Torres

Saha

et al. 2010

Journal of Colloid and Interface Science

144

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“…2A shows the N 2 adsorption-desorption isotherms for the samples prepared at 500, 800, 1000, and 1200 • C with 10.0 wt% alumisol and a 3.0 L min −1 carrier airflow rate. All isotherms exhibited a type-IV curve with a H2-type hysteresis loop, characteristic of mesoporous particles with interconnected pore networks [31][32][33]. Fig.…”

Section: Characterization Of Prepared Particlesmentioning

confidence: 99%

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

Liu

2010

Chemical Engineering Journal

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a b s t r a c tMesoporous transition alumina was prepared by spray pyrolysis of an alumisol precursor, without the use of structure-directing reagents. The prepared alumina exhibited a well-defined mesoporous structure with narrow pore size distribution (3.0-4.7 nm). Preparation temperature played a major role in the phase formation and the porosity of prepared alumina. The phase transformation of boehmite to ␥-Al 2 O 3 andAl 2 O 3 was observed at 800 and 1200• C, respectively. An increase in preparation temperature resulted in a decrease in surface area and pore volume and an increase in pore size. Longer residence time promoted the crystallinity of prepared alumina effectively, but it also led to the formation of particles with smaller surface area, lower pore volume, larger pore size, and broader pore size distribution. Additionally, while alumisol concentration had little effect on the surface area, its reduction led to a decrease in pore volume and pore size and caused the formation of bimodal pore size distribution. The as-prepared alumina also exhibited excellent thermal stability, showing great application potential for industry.

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Granulation of sol‐gel‐derived nanostructured alumina

Cited by 53 publications

References 26 publications

Heterogeneous Catalyst Deactivation and Regeneration: A Review

Heterogeneous Catalyst Deactivation and Regeneration: A Review

Adsorption equilibrium and kinetics of fluoride on sol–gel-derived activated alumina adsorbents

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

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